TCM L13-2 L16-2 Wheel Loader Service Manual SEW-619AE - PDF DOWNLOAD

No．SEW−619AE

丁℃罰閲㊥ 至≡≡「二3≡さ二三ごニニ三二

WHEEL L＿OADER

色よ匠7⊂な雪

包皮夢＝β

TCMCORPORÅTtON

SEW−619AE

FOREWORD TCMoffersawidevarietyofwheelloaderswhichhavebeenenthusiasticallywelcomedbyusersall overtheworld．

TCMModelsL13−2andL16−2，articulatedtypewheelloaders，arethelatestproductsdevelopedfrom yearsofresearchandexperience・Togetthemostoftheloader，itisrequiredthatyoubecomefamil Withitsfeatures，COnStruCtion，OPeratlngandmaintenanceprocedures・

ThisServiceManualexplainsthestructureoftheaboveloadersforservicepersonnelandshopworkers・

Wehopeitwillbeyourreferenceguideduringserviclngjobs‥ ThedescrlPtlOnSandspecificationsdescribedinthismanualaresubjecttochangewithoutnotice・ June，2001

丁伽c。R，。RA，．。N

SEW−619AE

TABLEOFCONTENTS 0．SPECIF］CAT10NS 0．10UTERVIEWS 0．2 SPECIFICATIONS

5 5

l．ENG］NEAND RELATEDCOMPONENTS 1．1ENGINE l l l l

1．4 FUELSYSTEM

0

l

1．3 COOLINGSYSTEM

0ノ

1．2 LUBRICATINGSYSTEM

2

1．6 ELECTRICALSYSTEM

4

1．7 ENGINECONTROLUNIT

1 父 3U 3 ′n▼

2．POWERTRAIN

2

2．1HSTUNIT

2

1．5INTAKEANDEXHAUSTSYSTEM

2

2．1．2 HSTCIRCUITANDHSTCHARGECIRCUIT

／b

2．2．2 PUMPCONTROL

2．3 HSTMOTOR 2．3．1GENERALDESCRIPTION 2．3．2 REGULATOR 2．3．3 MOTORCOMBINATIONVALVE

2．3．5 STOCK−PILE＆SNOW（S＆S）MODE（OPTIONFORL16−2）

2 3

2．4 TRANSMISSION

3 4 ／b O

2．3．4 MOTORTII＿TROLLINGSPEEDCONTROLVALVE

4 5 qノ 1 つJ 5 5 5 5 5

2．2．4 FNRSOLENOIDVALVE

3

2．2．3 NEUTRALDUMPSOLENOIDVALVE

つJ

2．2．1GENERALDESCRIPTION

つム l 00 1 2 Oノ

2．2 HSTPUMP

2

2．1．3 HSTCONTROL

2

2．1．1HYDRAULIC DRIVE

7

2．4．1CLUTCH SHAFT

2．4．3 TRANSMISSIONCIRCUIT

2．4．4 QUICKSHIFTSWITCH（QSS）（OPTION）

／b ∠U ／b

2．4．2 TRANSMISSIONCONTROLVALVE

／

SEW−619AE

2．6 DRIVEAXLES（FRONTANDREAR） 2．6．1AXLE 2．6．2 DIFFERENTIAL 2．6．3 FINALREDUCTIONGEAR

2．7 WHEELASSEMBLY（TIREANDWHEEL） 2．7．1TIRE 2．7．2 WHEEL

3．BRAKE SYSTEM 3．1SERVICEBRAKE

3．1．1GENERALDESCRIPTION（BRAKELINE） 3．1．2 BRAKEVALVE

3 4

1

1 0ノ

1

7

1

0

1

1

0

3．2．2 PARKINGBRAKEELECTRICCIRCUIT

0

1

3．21GENERALDESCRIPTION（BRAKELINE）

2

3．2 PARKINGBRAKE

1

3．1．4 BRAKE OILTANK

1

3．1．3 DISKBRAKE

0ノ l 1 5 7 0ノ 0ノ l q つノ ︼ 2 7 7 00 00 父U 8 8 史 qU ノ O 0O ノ 0ノ

2．5 PROPELLERSHAFT

3．2．3 PARKINGBRAKE

0

3．2．4 ADJUSTINGPARKINGBRAKE

0

6，HYDRAULIC SYSTEM 6．10ILCIRCULATIONROUTES 6．2 PUMP

1

5．2 CENTERHINGEPIN

1

5．1FRAME

2 2 1

5，FRAMEANDCOCKPIT

1

4．7 STEERINGCYLINDER

2

4・6 CUSHIONVALVE（L16−20nly）

1 1

4．5 PRIORITYVALVE

l

4．4 STEERINGVALVE（ORBITROL）

1

4．3 STEERINGWHEELUNIT

l

4．2 0ILCIRCULATIONROUTES

l 1

4．1GENERALDESCRIPTION

3 5 ′hU 7 2 7 0ノ 0 1 1

4．STEER】NG SYSTEM

SEW−619AE

1

4 1

5 1 1 1 1

つJ l l l l l l l

′0

1

∠U ′0 1 1

∠U

1 1 1 1 1

8．4 ELECTRICCIRCUITDIAGRAM

ノ 4 0ノ 40 0 2 3 4 つJ 0 4 ／hU ′0 7 7 7 7 7

′0

2

8．3 LOCATIONOFRELAYS

00

7．2．2 BUCKETCYLINDER

8．2．2 LIGHTINGSWITCHANDTURNSIGNALSWITCH

′0

l

7．2．1BOOMCYLINDER

8．2．10PERATINGSTATUSMONITORS（CLUSTERMETERUNIT）

5

7．2 CYLINDERS

8．2 METERSANDSWITCHES

00

l

7．1．4 BOOMKICKOUT（OPTION）

8．1LIGHTINGUNIT

5

7．1．3 BUCKETLEVELER

8．ELECTRICALSYSTEM

5

7．1．2 BUCKET

7 5

7．1．1GENERALDESCRIPTION

O

7．1BOOM，BELLCRANKANDBUCKET

∠U

5

6．5 0ILTANK

7．LOAD HANDLING SYSTEM

5

6．4 VAI」VECONTROLS

4

6．3．3 RELIEFVAIJVE

つJ

6．3．2 0PERATION

4

6．3．1GENERALDESCRIPTION

3

6．3 CONTROLVALVE

0．SPECIFICAT10NS

0．SPECIFICAT10NS 0，10UTER V［EWS （L13−2）

Unit：mm［in．］

Fig．0．10uterViews（L13−2） −1−

0．SPECIFICATlONS

（L16−2）

Unit：mm［in．］

Fig．0．2 0uterViews（L16−2） −2−

0．SPECIFICAT10NS

0．2 SPEC［FICATIONS Loadermodel

L13■2

L16．2

Front−endarticulatedloaderwithdieselenglne

r吋pe

Perrormance

Bucketcapaclty，heaped Breakoutforce，bucketcylinder

SAEratedoperatingload，fu11turn

1．3［1．7］

m3［y3］

kN†kgf）［1bf］

61．7（6300）［13871］ 2080［4586】

kg［1bs］

1．6［2．1］ 79．4（8100）［17850］ 2560［5644］

Risingtirne，ful1load

s

5．0

5．6

Lowerlngtime

s

3．0

3．0

Bucketdumplngtime

s

1．0

1．2

Travelspeed，fwdlst

km／h［mph］

13．0［8．1］

13．0［8．1］

fwd2nd

km／h［mph］

34．5［21．4］

34．5［21．4］

revIst

km／h［mph］

13．0［8．1］

13．0［8．1］

rev2nd

km／h［mph］

34．5［21．4］

34．5【21．4］

kN（kgf‡［lbf］ 58．8（6000）［13219】

Max．tractionforce

Gradeability，fwdlst

71．6（7300）【16096］

250incline

250incline

Min．turnlngradius OutermOStPartOfbucket

mm［in．］

5215［205．3］

5470［215．4］

CenterOfoutermostwheel

mm［in．］

4440［174．8］

4690［184．6］

mm［in．］

6075［239．2］

6420［252．8］

mm［in．］

6095【240］

6430［253．1］

mm［in．］

2180［85．8］

2320［91．3］

mm［in．］

2340［92．1】

2480［97．6］

mm［in．］

2870［113］

2960［116．5］

mm［in．］

3060［120．5］

3150［124］

Overalloperatlngheight， bucketfu11yraised

mm［in．］

4510［177．6】

4685［184．4］

Wheelbase

mm［in．］

2600【102．4］

2725［107．3］

Tread，frontwheels

mm［in．］

1725［67．9】

1820［71．7］

mrn［in．］

1725【67．9］

1820【71．7］

Dimensions

Overa11length，bucketonground incarryposition Overallwidth，loaderbody bucket

Overallheight，tailpIPe topofawning

rearwheels

−3−

0．SPECIFICAT10NS

L13．2

Ll（i．2

32

33

Min・grOundclearance，Centerhingepin mm［in．］

365［14．4］

375［14．8】

Buckethingepinheight

3515［138．4］

3615［142．3］

Dumpingheight，at450dischargeangle mm［in．］

2710［106．7］

2750【108．3］

Reach，at450dischargeangle

1020［40．2］

1040［40．9］

48

48

48

48

mm［in．］

980［38．6］

1070【42．1］

kg［1bs］

6625［14610】

8215［18110］

Rearoverhangangle

O

mm［in．］

mm［in．］

Bucketro11angle，incarryposition

O

Bucketdumplngangle， bucketfullyraised Tbwingpinheight

O

Ⅵ7eight

Weightoftheloader

−4−

1．ENGINE AND RELATED COMPONENTS

1．ENGINEANDRELATEDCOMPONENTS 1．1ENG】NE l．GeneraJDescription

TheenglnemOuntedonthisloaderisa4−CyCle，Water−COOled，OVerheadvalve，in−1ine，directlIt）eCtion

typedieselenglneWithaturbocharger． Theenglneismountedattherearoftheloaderanditspoweristransmittedthroughtheflywheel， COuPlinggear，andhub，intotheHSTpump．

−5−

1．ENGINE AND RELATED COMPONENTS

Engine model

L13＿2：IsuzuBB−4BGIT

L16＿2：IsuzuDD−4BGIT 「吋pe

4−CyCle，Water−COOled，OVerheadvalve，in−1ine，direct lnjeCtiontypewithturbocharger

Numberofcylinders−borexstroke

4−105mmx125mm［4．13in．x4．92in．］

Total displacement

4．329L【264．2in3］

Compression ratio

18

Engineperformance Ratedspeed

L13−2：2100rpm L16−2：2200rpm

Ratedoutput

L13−2：64・7kW（88．Ops） L16T2：80．9kW（110．Ops）

Maximumtorque

L13−2：314N−m（32．Okgf−m）【231．61bf−ft］ L16−2：363N−m（37・Okgf−m）［267．71bf−ft］

FuelconsumptlOnatratedpolnt

L13−2：253g／kWhr（186g／pshr） L16−2：257g／kWhr（189g／pshr）

Dry weight

375kg［826．71bs］

Dimensions（OVeralllengthx OVera11widthxoverallheight）

925．7mmⅩ707mmX855mm［36．4in．x27．8in．x33．7in．］

Firing order

1−3− 4− 2

Rotational direction

Clockwisewhenviewedfromcoolingfanside

Starting aids

Glow plug

Enginestopplngmethod

Keyswitch

Unloadmax．speed （whenseparatelymeasured）

L13−2：2300rpm L16−2：2500rpm

Unloadmin．speed

（whenseparatelymeasured）

1OOO rpm

Allowabletiltingangle

350infourdirectionswhenviewedfromflywheel

Maintenancedata Valveopenlngandcloslngtime

Openlng

Closlng

Intakevalve 190beforeTDC 470afterBDC Exhaustvalve 570beforeBDC 150afterTDC Valve clearance

Intakevalve（COld）：0．4mm［0．016in．］ Exhaustvalve（COld）：0．4mm［0．016in．］

Injectiontimlng

L13＿2：90beforeTDC L16＿2：70beforeTDC

Injectionstartpressure

18・1MPa（185kgf／cm2）［2625psi］

Compressionpressure

3・04MPa（31kgf／cm2）【441psi］at200rpm

−6−

1．ENGINE AND RELATED COMPONENTS

2．Outerviews

1．THERMOSTATHOUSING 2．AIRBREATHER 3．AIJERNATOR 4．OILDIPSTICK 5．0ILPAN 6．TURBOCHARGER 7．EXHAUSTMANIFOLD 8．OILFILLERCAP 9．STARTERMOTOR lO．FLYWHEELHOUSING

11．NOZZLEHOLDER 12．INLETMANIFOLD 13．0ILFILTER 14．0ILPRESSURESWITCH 15．FUELFILTER 16．WERSEDIMENTER 17．INJECTIONPUMP 18．FEEDPUMP 19．COOLINGFAN

Note：TheabovesketchesshowtheenglnemOuntedontheL13−2・ThestructureoftheenglnemOunted ontheL16＿2is almostthe same．

Fig．1．14BGITDieselEngine −7−

1．ENGINE AND RELATED COMPONENTS

3．EngJneMounting Theenglneisconnectedtothedriveunitandsupportedbytherearframeat4polntSOntherightand leftsides，Withmountlngrubbersatbothsidesofthecylinderbody・

Note：B＞（芯＝コ42−48N−m（4．3T4．9kgf−mI［31−35．41bf−ft］

B＞ぢ＝コ235±24．5N−m（24±2．5kgf−m）［173±18．11bf−ft］ l．ENGINE

5．PLATE

2．BRACKET

6．BRACKET

9．EYEJOINT lO．HOSE

3．CUSHIONRUBBER

7．PACKING 8．EYEBOLr

ll．PLUG 12．ADAPTER

4．（REARFRAME）

Fig・1・2 MountlngOfEngine −8一

1．ENGINE AND RELATED COMPONENTS

1．2 LUBRICATING SYSTEM Lubrication

Forcedcirculationmethod Gearpumpdrivenbythecamshaft

Lubricating pump

Full−flowfilterpapertype Built−incoolingsystem

Filtration Cooling

PistonandsprlngtyPe 13L［3．4USgal］

Oilpressurea4juster LubricatlngOilcapaclty

TheenglnePartSarelubricatedbyforcedcirculationmethodbytheoilpump・TheenglneOilpicke upfromtheoilpanbytheoilpumpanddirectedunderpressure，PaSSlngthroughtheoilfilterandtheoil COOler，tOtheoilgalleryfromwhichtheenglneOilisdeliveredtoeachsectionforlubrication，before returnlngbackintotheoilpan．

TheoccurrenceofanabnormalenglneOilpressureismonitoredbyboththeoilpressureswitchand

theoilfilterclogglngWarnlngSWitchanddisplayedbywayofthe Engineoilpressure warnlngli Oftheclustermeteronthedashboard．

OLL PAN

Fig．l．3 SchematicDiagramofEngineLubricatlngSystem

−9−

1．ENGINEAND RELATEDCOMPONENTS

1．3 COOLINGSYSTEM Water−COOledtype

Cooling

Cooling fan Pushertype，550mm［21・7in・］dia・，7−bladed

「丹pe

Driving

Belt driven Belトdrivenvolutepump

Water pump VVaterthermostat

Type

Wax−Pellettype

Temp．atwhichvalvestartsopenlng

820C［1800F】

Tbmp．atwhichvalvefu11yopens

950C［2030F］

Radiator forenglne

Corrugatedfin（Wavy）TICWN

foroilcoolerworkingoil

Corrugatedfin（Wavy）T−CW

cap working pressure

49kPa（0．5kgf／cm2）［7・11psi］

dry weight

Approx．65kg［1431bs］

Cooling water capacity

19L［5．02USgal］（totalcapacity）

Fig・1・4 SchematicDiagramofEngineCoolingSystem

−10−

1．ENGINE AND RELATED COMPONENTS

Note：Thesketchesshowthecoolingsystem OftheL13−2．Thecoolingsystemofthe

16−2hasalmostthesamedesign

1．FANGUARD 2．DRAIN COCK

5．RADIATOR 6．PLATE

3．UPPERHOSE，

7．LOWERHOSE，

RADIArOR 4．RESERVOIRTANK

Fig．1．5 EngineCoolingSystem

−11−

RADIATOR 8．HOSE

1．ENGINE AND RELATED COMPONENTS

1．4 FUELSYSTEM L13・2（BB・4BGIT）

Ll ・2（DD・4BGIT）

Iqjectionpump

Boschtype（1ine）

←

Injectionnozzle

Poroustype

←

Plungertype（Withmanualpump）

Fuel feed pump Fuel員1ter

Filterpapertype

← ←

Governor Governlng

Centrifugal，all−SPeedcontrol

←

（RSVtype）

Lubrication

Forcedcirculation

←

Fuel tank capacity

140L［37USgal］

155L［40・9USgal］

1・GeneralDe＄Cription Thefuelfeedpumpdrawsfuelfromthefueltankthroughthewatersedimenterandsenditunder

PreSSure，PaSSlngthroughthefuelfilter，tOtheiItleCtionpump・ThefuelisthendistributedtotheinJeCtio

nozzleandinjectedintothecylinder．

1．FUELTANK

4．FUELFIIJER

2．WArERSEDIMENTER 3．FEEDPUMP

5．INJECTIONPUMP 6．INJECTIONNOZZLE

7．OVERFLOWVALVE 8．OVERFLOWVALVE

Fig・1・6 SchematicDiagramofEngineFuelSystem −12−

1．ENGINEAND RELATEDCOMPONENTS

2．FuelTank Thefueltankisweldedtotheinsideoftherearpartoftherearframe，Withitsfuelhoses（SuCtionand

return）connectedtotheengine． ThefueltankisequlPPedwithafuellevelsenderunitwhichdisplaysthefuellevelonthefuelmeter Ofthedashboard． ㊥「 包

／

／〔ミ藩／

＼ 晦 l ＼／′＋

④fromINJECTIONPUMP ⑧towArERSEDIMENTER（FUELFEEDPUMP） 1．FUELSENDERUNIT 2．FUELHOSE，SUCTION 3．FUELHOSE，RETURN

4．REARFRAME 5．FUELTANK

6．BREATHERHOSE 7．STRAINER 8．CYLINDER 9．KEY lO．CAP Fig．1．7 FuelSystem −13一

11．COCK 12．PLUG 13．PLATE 14．NIPPLE

1．ENGINE AND RELATED COMPONENTS

1．5INTAKEAND EXHAUSTSYSTEM L13−2（BB・4BGIT） Aircleaner Mu刑er

Cyclonefilterpapertype（8

L柑・2（DD・4Ⅰ主GIT）

）

Porous separators

← ←

Turbocharger Name

TDO4HL

TDO4H

Turbocharglng

Exhaustturbocharger

←

Lubrication

Forcedcirculation，Oilcooled

←

1．GeneraJDescription Theintakesystemoftheenglneisdesignedsothattheoutsideopenairisdrawnthroughtheair

Cleanerintotheinletmanifold．TheaircleanerisequlpPedwithadustindicator．Theelementn

becleanedwhenthewarnlnglightcomeson・ Theexhaustsystemisdesignedsothattheexhaustgasfromtheexhaustmanifoldispassedthrough themufflerwherethepressureandtemperatureoftheexhaustgasarelowered，anddischargedthrough thetailpipeintotheatmosphere．

ABecarefulnottotouchthemufflerorexhaustmanin）ldsincetheyarehotwhentheengineis runnlngOrfbrawhileafteritisshutoff；Otherwiseyoumightburnyourhand．

れ1rbocharger ItispossibletoattainhighenglneOutPutbysendinghighlycompressedairintothecylindersonthe

intakestroketoincreaseairsupply，thusincreaslngthequantltyOffueltobeiIt）eCted．Toachieve PurPOSe，theL13L2andL16−2areequlPPedwithanexhaust−driventurbocharger． Theturbocharger

sexhaustgasinletisconnectedtotheexhaustmanifold．Theexhaustgasro

theturbinewheelatahighspeed，beforebeingroutedthroughtheexhaustgasoutletintothemuffler．

Therefore，theimpe11er，mOuntedontheoppositeendofthesameshaftastheturbine，alsorotatesa

ahighspeedtocompresstheairdrawnthroughtheaircleanerandsendsittotheintakemanifold．

−14−

1．ENGINE AND RELATEDCOMPONENTS

Note：Themufnerbandistightenedwiththenut（A）

Note：The sketch shows theintake and exhaustsystemoftheL13−2．The

to20N−m（2kgf−m）［14・81bf−ft］andsecured

StruCtureOftheintakeandexhaust

Withthelocknut（B）．

SyStemOftheL16−2isthesame．

Note：Assemblethemufflerbracket

Tighteneachparttemporarily・Assemblethem intheorderof①→②→③→④→⑤，uSing Cautionnottoapplyunnecessaryforceonthe mufflerandtube．

Note：B＞14＝ゝThreadedarea：LOCTITE＃262 1．TAILPIPE 2．BAND 3．MUFFLER 4．BRACKET

5．BRACKET 6．BRACKET 7．AIRCLEANERHOSE 8．AIRCLEANER Fig．1．8IntakeandExhaustSystem −15−

9．BRACKET lO．ENGINE

1．ENGINEAND RELATEDCOMPONENTS

1，6 ELECTRtCALSYSTEM Battery Voltage and capacity

12V，55Ah（5−hourrate）

Quantity

2

Weight（PerCaSe）

18・3kg［40・31bs］

Startermotor 乃pe

Electromagneticplnion−Shiftreductiontype

Voltageandoutput

24V4．5kW

Alternator

Voltage and output

AC type 24V，50A

Driving

Belt−drive

「吋pe

Automatic charging regulator

Type

ICregulator（integrated）

Coldstartlngaids

Quickglowplug

Stopping device

Fuelshut−0ff，StOPmOtOrtyPe

1．Battery Twobatteriesarehousedinsidetwobatteryboxes，Oneforeach，attherightandleftsidesoft frame・Wheninspectionofthebatteryunitisneeded，OPenthebatteryboxcover・

A Danger！！Useduecautionwhenhandlingthebatteryunit・

1・Nofire・Nospark・Neversmokeorusefireornakedflamenearthebatteryunitsinceflammable

gasisalwaysreleasedfromthebatterybox・

2・Thebatteryelectrolyteisdilutesu）furicacid・Itwi11causepainfulandseriousburnsifi ontheskin．Itcancauseblindnessifitgetsintoeyes・Ifelectrolytegetsontoyourskin，flush

offwithacoplOuSamOuntOfwaterandgetmedicalhelp・Ifelectrolytegetsintoyourey

flushyoureyesoutwithacop10uSamOuntOfwaterandgettoadoctoI㌧

−16−

1．ENGINE AND RELATED COMPONENTS

2．Electric Circuit Fortheelectriccircuitdiagramoftheenglne，referto

8．4ElectricCircuitDiagram・

（1）Generaldescription

①Theenginecoldstartingaidisaglowplug． IfacoldenglneWOn

tstart，turnthestarterswitchtothe

ON

positiontoenerglZetheglowplug，

thuspreheatingtheenglne．Then，turnthestarterswitchtothe

START

positiontocrankth

englne・

②Theenginestoppingdeviceisafuelshut−0fftypewhichstopstheenginewhenthestarterswitch turnedtothe OFF position．（Engineshut−0ffdevice） FormoreinformationontheenglneShut−0ffdevice，referto

1．7ENGINECONTROLUNIT・

（2）StarterSwitch

Thestarterswitchhasthreepositions：OFF，ONandSTART．

a Engine Neutral Start UnlessthetransmissioncontroIswitch（Shiftlever）isinneutral，theenginewon

tstart・（Refer

2．4．2TRANSMISSIONCONTROL．

ThispreventstheloaderfrommovlnguneXPeCtedlywhenthestarterswitchisturnedon・

Position OFF ON START

Fig．1．9 StarterSwitch

−17−

B BR ACC Rl R2 C

1．ENGINEAND RELATEDCOMPONENTS

1．7 ENGINE CONTROL UNrT l．Accelerator Peda［

TheenglneSPeediscontrolledbyoperatlngtheacceleratorpedal・

Whentheacceleratorpedalispressed・thegovernorcontrolleveroftheenglneisactuatedth thecontroIcablesothatanenglneSPeedmostsuitedtotheworkingconditioncanbeobtained・

1．ACCELERATORPEDAL

5．PEDALCOVER

2．CABLE

6．PEDAL

3．BRACKET 4．ENGINE

7．PIN 8．BRACKET

Fig．1．10 AcceleratorPedal −18−

9．STOPPERBOIJ lO．ROD ll．BELLCRANK 12．SPRING

1．ENGINEAND RELATEDCOMPONENTS

2．EngineShut−OffDevice

AdieselenglnedoesnothaveanyelectriclgnltlOndevicelikeagasolineenglne，SOitcannotusually beshutoffsimplybyturningthemainswitch（StarterSWitch）0ff． Forthisreason，thewheelloadershaveanenglneShut，0ffdeviceuslngaStOPmOtOr・Whenthestarter SWitchisturnedtothe＝OFFりposition，theenglneStOPmOtOraCtuateSthegovernorstoplevertocutoff thesupplyoffueltotheinJeCtionnozzle，thusshuttingofftheenglne．

1．GOVERNOR 2．GOVERNORSTOPLEVER 3．INJECTIONPUMP

Thestopmotor，mOuntedontherearframe，OPerateSthegovernorstopleverwiththewireattache themotor．

Fig．1．11AcceleratorPedal

−19一

1．ENGINE AND RELATED COMPONENTS

N OTE

−20−

2．POWERTRA［N

2．POWERTRAIN

ThepowertrainconsistsoftheHSTunit，tranSmission，PrOPellershafts，frontaxle，rearaX tlreS．

PowerfromtheenglneistransmittedthroughtheHSTunittothetransmissionwheretherotational SPeedisconverted，anddelivered，PaSSlngthroughthepropellershafts，tOthefrontandrearaxles・

Thepowertransmittedtoeachaxleisfurthersentthroughthewheeltothetiresothatloadermoves

−21−

2．POWER TRAIN

TheschematicdiagramofthepowertransmissionoftheloaderisglVenbelow・

Fig．2．1PowerTrain

ー22−

2．POWERTRAIN

2．1HSTUNIT 2．1．1HYDRAULIC DRIVE l・GeneralDescription Hydraulicdrivesconvertenginepowerfirsttofluidpowerandthentomechanicalpower（1inearor

rotationalmotion）whichdrivesthewheelsorothercomponents・Thefluidtobeusedismineralhydraulic

Oil・Inthissense，yOuCanCallallhydraulicdrivesatypeofhydrostatictransmission（HST）・However

thehydrostatictransmission（HST）generallymeansthekindofhydraulicdrivethattransmitson rotationalpower． Hydraulicdrivesareclassifiedintotwotypes：thehydrostatictypewhichusespressureenergyand thehydrodynamictypewhichuseskineticenergy． （l）HydrodynamicUnit

The hydrbdynamic unit uses kinetic energy PrOducedbyfluidflowlngatahighspeed．Thehigh−

SPeed，low−PreSSure fluidis discharged fromthe Centrifugalpump，hitstheturbinewheelbladestoturn

theturbinewheelandthustheturbine shaft，OutOf Whichtherotationalpoweris taken．The torque COnVerterisatypICalhydrodynamicunitandisused forwheelloadersandothervehicles．

Fig．2．2

（2）HydrostaticUnit Thehydrostaticunituseshigh−PreSSure，low−SPeed fluid（Oilpressure）．Thepressureoildischargedfrom

thepumpISSenttOthehydraulicmotorwhichisin

turnrotatedtotransmitthepowertothedrivewheels・ Thiskindofhydrostaticunitiscalledahydrostatic transmission（HST）．TheHSTpumpandHSTmotor

formaclosedloop；theyareconnectedthroughthe

hydrauliclinessothatthefluidflowsbetweenthe PumPandmotor．Sincethefluidisnon−COmPreSSive，

itactsas arigidlinkthatconnectsthepumptothe motor．Thiskindofunitis usedforskidsteerwheel

Fig．2．3

loaders and small−Sizedwheelloaders．

−23−

2．POWER TRAIN

2．HydrostaticTransmission（HST）

Theoperatingprincipleofthegeneralhydrostatictransmission（HST）whichusesavariablecapaci axialpistonpumpandmotorfortheHSTpumpandHSTmotor，reSPeCtivelyisglVenbelow・

（1）OperationofIISTPump

①whentheslidingsurfaceoftheswashplateisflatandpositionedvertically，thesystemstan

neutralandnooilisdischarged．Evenifthedriveshaftrotates，thesuctionanddischargeofoilis

notperformed，despitetherotationofthecylinderblock．

Fig．2．4 Neutral

②whentheswashplateanglecontro11everisshiftedtotheleft，thecylinderblockturnsenoug PaSSbeyondthekidneyBtodrawoilintothepIStOnholes．Whenthecylinderblockturnstopass

beyondthekidneyA，PreSSureOilisdischargedfromthepIStOnholes・Whenthecylinderblo turnscontinuously，OilissuckedthroughportBleadingtothekidneys，beingdischargedthrough portA・

③Thevolumeofoiltobesuckedanddischargeddependsuponthepistonstrokeorthetiltingangle Oftheswashplate．Thedischargevolumeofoilisreducedby reducingthetiltingangleofthe SWaShplateandisincreasedbyincreaslngthetiltingangle． E＝コLow−PreSSureOii swASHPLATEANGLECONTROLLEVER

／

CYuNDERBLOCK

MOVABLE SWASH PLATE

KJDNEY A

Fig．2．5 PumpOperation（1）

−24−

2，POWERTRA［N

④Astheswashplateanglecontrolleverisshiftedtotheright，theoilflowisreversed・（therotational directionofthedriveshaftremainsthesame．）

TheoilissuckedthroughportAanddischargedthroughportB・

Fig．2．6 PumpOperation（2）

（2）OperationofHSTMotor ①Thehigh−PreSSureOilfromthepTmPflowsthroughportAandkidneyAtoactsonthepistoninthe cylinderblockandpushesitagalnStthedriveshaft・

②Thedriveshaftthenrotatestogetherwiththepiston．Thelow−PreSSureOildischargedfromthe PIStOnflowsthroughkidneyBandportB・ ③Incontrast，Whenthehigh−PreSSureOilfromthepumpflowsthroughportBandkidneyB，thedriv shaftrotatesinreverse．

④Astheinclinedshaft（driveshaft）angleObecomeslarger，thepistonstrokeincreasessothatthe driveshaftspeedslows・Incontrast，aStheinclinedshaftangleObecomessmaller，thedriveshaft SPeedincreases・

DRLVE SHAFT

Fig．2．7 MotorOperation −25−

2，POWERTRAIN

2．1．2 HSTAND HSTCHARGE C［RCUIT

TheHSTandHSTchargecircuitconsistsprlmarilyofanHSTpump，HSTmotor，hydraulicoiltan HSTcharglngPumP，andHSTfilter．

TheHSTpumphasapumpcombinationvalvesland2，FNRsolenoidvalveandneutraldamp

SOlenoidvalve・TheHSTmotorisequlPPedwithamotorcombinationvalve・ TheHSTchargingpumpdrawshydraulicoilfromthehydraulicoiltankandsendsit，PaSSingthrough

theHSTfilter，tOthelow−PreSSureSideofthecircuitbetweentheHSTpumpandHSTmotor・

PreSSureOilisalsousedtocooltheHSTpumpandHSTmotor・Inaddition，thepressureoilf HSTcharglngPumPSerVeSalsoasthepowersourcefortilt，COntrOllingtheHSTpump・

ThepowerfromtheenglnedrivesHSTpumpdirectlyandthereforethepressureoilfromtheHST

PumPrOtateStheHSTmotor．

TheoutputfromtheHSTmotoristransmittedintheorderoftheHi−Lotransmission，PrO Shafts，aXles，andtires． TheHSTcircuitisaclosedcircuitandworkswithacombinationofthevariableplungerpumpand

thevariableplungermotortochangethedisplacementvolumeinboththeHSTpumpandtheHST

motor，thuschangetheHSTmotorspeedsteplessly・Inaddition，Whenthetravelingspeedisaccelerat

OrSloweddownorwhentheacceleratorpedalisreleased，theHSTbrake（thepowerheldduringtr

istransmittedintheorderoftheHSTmotor，HSTpump，andenginetoslowdowntheloader）

SmOOthlyapplied．

PROPELLER SHAFT

Fig．2．8 HSTCircuit −26−

2．POWERTRAIN

（1）Neutralcircuit Whentheshiftleverisinneutral，theFNRsolenoidvalveiskeptintheneutralposition．Thepressure

OilfromtheHSTcharglngPumPisbranchedintotwoflowsbytheHSTpump：Oneisdirectedtothe COntrOIpressurebypassvalvetomoveittotheleft． ThispressureoilalsoflowsthroughtheneutralcircuitoftheFNRsolenoidvalveandactsonthetwo

SerVOPIStOnSOftheHSTpump．SincethetwoservopIStOnSareSゆjectedtotheoilpressureofthesam

magnitude，thetilt−rOllingpIStOnOftheHSTpumpwon，tmoveintoeithertheforwarddirectionorthe reversedirectionsothatthepressureoilisnotdischargedfromtheHSTpump・Therefore，theHST motorwon

trotate．

Whentheshiftleverisinneutral，theneutraldampsolenoidvalveisalsointheOFFposition・Th

PreSSureOilbanchedinsidetheHSTpumpisthusblockedbytheneutraldampsolenoidvalve・ Therefore，thepressureoildoesnotactontheneutraldampvalve，1eavlngltOPen．Sincetheneutral

damplSOPen，thecircuitsAandBftheHSTmotorareconnectedtoallowtheHSTmotortorotate 丘eely．

Therefore，itbecomespossibletotowtheloaderwhentheenglneisrunnlng，byputtingtheshift leverinneutral．

SERVO 円STON

HST PUMP

NEUTRALDAMP SOLVALVE

Fig．2．9 NeutralCircuit −27−

2．POWERTRArN

（2）ForwardTravelCircuit Whentheshiftleverisputintheforwardposition，theFNRsolenoidvalvemovestotheleftandthe

neutraldampsolenoidvalvealsomovestotheleft，reSPeCtively・Thepressureoildischarged

HSTcharglngPumPisbranchedbytheHSTpumplntOtWOflows＝OneflowsthroughthethrottleAand

CircuitPlotothecontroIpressurebypassvalvetomoveittotheleft・Inaddition，thispressureoilpa

throughtheFNRsolenoidvalveandactsononeoftheservopIStOnSOftheHSTpump・ TheotherflowofpressureoilfromthechargepumppassesthroughthecircuitPhiandFNRsolenoid

ValveandactsontheotherservopIStOn・ TheservopIStOnSfunctionduetoapressuredifferentialproducedbythethrottleAbetweenthe

CircuitphiandthecircuitPlo． ThemovementofeachservopIStOnVariesinproportiontothemagnitudeofthepressuredifferential

betweenthecircuitPhiandthecircuitPlo・ThethrottleBservestowidenthepressuredifferen betweenthecircuitPhiandthecircuitPloinproportiontoenglnerPm・ ThepressureoilbranchedbytheHSTpumpflows，PaSSlngthoughtheneutraldampsolenoidvalve ，tOtheneutraldampvalvetomoveittotheright・

Whentheneutraldampvalvemovestotheright，itisclosedsothatapressuredifferentialisproduced

betweenthecircuitsAandBlocatedbetweentheHSTpumpandtheHSTmotor・

ThepressureoildischargedfromtheHSTpumpflows，PaSSlngthroughthecircuitA，tOt motortorotateit，thusmovlngtheloaderintheforwarddirection．

Whentheloadertravelsinreverse，theFNRsolenoidvalveisswitchedoverandthehigh−PreS

inthecircuitPhienterstheservoplStOnOPPOSitetothatusedforforwardtravel． TheHSTpumpswashplatetiltrollsinthedirectionoppositetothatforforwardtravelsothatthe PreSSureOilisdischargedfromtheportoppositetothatforforwardtravel，thusrotatlngtheHSTmotor ln reVerSe．

HST CHARGJNG PUMP

HST PUMP

NEUTRAL DAMP

SOLEN01DVALVE

Fig．2．10 ForwardTravelCircuit −28−

2．POWERTRAIN

2．1．3 HSTCONTROL

TheHSTcontrolunitisanelectrictypeoperatedwiththeshiftleverinstalledonthesteerlngCOlumn・ Whentheshiftleverismoved，theFNRsolenoidvalveoftheHSTpumplSeXCitedtochangeover

thedischargedirectionsoftheHSTpumptodeterminethetravelingdirectionoftheloader・

トI︑N′−R

L，、ぎ ＼ R 1

uGHT（LAMP）

■﹂／〃＝＝

DLMMER（LAMP） 1．25

土﹈

TURN＆HAZARD（LAMP）

1．SHIFTLEVER 2．NEUTRALLOCK 3．HAZARD SWITCH 4．TURNSIGNALSWITCHLEVER

T／MSH肝T（RELAYCOIL） FNR（RELAYCOIL）

（SERVESALSOASLIGHTINGSW）

N 3 4 5 6 F

Fig．2．11ShiftLever −29−

N

R C

⊂〉

2．POWER TRAIN

DirectionalcontroIcircuit

①whentheparkingbrakeswitchisturnedoff（released），theelectriccurrentfromthe＃5fusefl0S，

PaSSlngthroughtheparkingbrakeswitch・tOtheparkingbrakeswitchsolenoidvalvetooperatelt・ （Fortheoperationoftheparkingbrake，referto

3．2PARKINGBRAKE．

）

②ThepressureoilfromthetranヲmiミSionchargingn，rakepuTPflowsthroughtheparkingbrakesoleno ValvetotheparkingbrakeclrCulttOincreasethecircultPreSSure，thusturnlngtheparkingbrake releasepressureswitchOFF．

③ AstheparkingbrakereleasepressureswitchisturnedOFF，theexcitationcircuitoftheFNRsolenoi

ValveearthrelaylSCutOffsothattheelectriccurrentfromthe＃8fusewon tflowto

SOlenoidvalveearthrelay・Therefore，theFNRsolenoidvalveearthrelayswitchcircuitisconne

totheearth．

④ whentheshiftleverisplacedintheforwardposition，theFNRswitchisswitchedovert POSition．

⑤ Theelectriccurrentfromthe＃8fuseisbranchedintotwonows：Oneflows，PaSSingthroughthe＃4

terminaloftheFNRswitch，tOtheFNRfrowardrelaytoexciteit・Theotherflows，PaSSlngthrough

theFNRforwardrelayandFNRsolenoidvalve，tOtheFNRsolenoidvalveearthrelayswit

SincetheFNRsolenoidvalveearthrelayswitchcircuitisconnectedtotheearth，thecircuitisthus

COmpletedtomovetheFNRsolenoidvalvetotheforwardposition・ ⑥Therefore，theloaderOVeSforward・ ⑦whentheshiftlever ．

inforwrdtravel・ FNR SWITCH

PARKING BRAKE

＝

l

SOしVALVE

Hi−LoTRANSMISS10N

Fig．2．12 DirectionalControICircuit −30−

2．POWERTRA［N

2．2 HSTPUMP

Model

Type

L13＿2

L16＿2

PV22−738

PV22−739 ←

ViabledeliverypIStOnPumP

Drivlng

Directly connected toenglneCrankshaft

←

Discharge

0−69．8cc／rev

←

Max．workingpressure

←

39．2＋b9MPa†400＋占9kgf／cm2） ［5685＋呂76psi］

（Reliefvalvepressure）

←

38・7＋も▲5MPa（395＋占5kgf／cm2） ［5613＋呂18psi］

Control

Automotiveregulatorcontrol

←

Weight

95kg［209．41bs】

←

Geartype

←

HST charging pump

Note：ForthespecificationsoftheHSTcharglngPumP，referto

こ） 〔）

6．2PUMR

● 〔） こ）

／￣−、

しノ

く） 口

′■￣＼

∩

しノ こ）

Note：B＞ぢ：：：：コ225N−m（23kgf−m）［1661bf−ft］

1．HSTPUMP

4．PLUG

2．FLYWHEELCOVER 3．SOCKETBOIJl

5． 0 −RING

7．BOIJ 8．COUPLING

6．HUB

9．（HSTCHARGINGPUMP）

Fig．2．13 HSTPump −31−

2．POWERTRA［N

2．2．1GENERALDESCR［PT10N

TheHSTpumpISaSWaShplatetype，Variabledeliveryplungerpumpwhichtilt−rOllsinbothdirectio

TheHSTpumpisequippedwithtwopumpcombinationvalves（1and2），neutraldampsolenoidvalv

andFNRsolenoidvalve．

TheHSTpumpconsistsprlmarilyoftheshaft，Plunger，Cylinderblock，SerVOPIStOnS，and Valve（forchargecircuit）．

Thepumpcombinationvalvelconsistsofaregulator，inchingvalve，Cut−0ffvalve，PumPtilt−r SPeedcontroIvalve，COntrOIpressurebypassvalve，andFNRsolenoidvalve．

Thepumpcombinationvalve2consistsofaneutraldampvalve，reliefvalve（forforwardtravel），

reliefvalve（forreversetravel）．

ThepowerledfromtheenglneistransmitteddirectlytotheHSTpumpshaft・Therotationofthe PumPShaftisthentransmittedthroughthecouplingtothetriplegearpump・

SHOE

CYLBLOCKPLER

SectionaJvie

l

Fig・2・14 HSTPump（1） −32−

2．POWERTRAIN

（HSTPUMP）

Note：Thenumbersinthefigurecorrespondto thoseofthepartsnameshownonPage34． View100kingfromA

View100kingfromB

Fig．2．15 HSTPump（2） 一33−

2，POWERTRAIN

ニこtoHSTMOTOR

芸こ tO HSTMOTOR

1．PUMPCOMBINAnONVALVE1 2．CUTlOFFVALVE 3．fronlMAINSTEERINGCIRCUIT 4．PUMPSELF−DISCHARGE PRESSUREPORT（fromPUMP COMBINATIONVALVE2） 5．INCHINGVALVE 6．CONTROLPRESSURE BYPASS VALVE 7．FNRSOLENOIDVALVE

10．fromHSTCHARGINGPUMP ll．PUMPSELFTDISCHARGE PRESSUREPORT（toPUMP COMBINATIONVALVEl） 12．PUMPCOMBINATION

19．CHARGEPORT（fromPUMP

CASING） 20．CHARGERELIEFVALVE 21．DRAINPORT（toHST

MOTOR） 22．CHARGEPORT（toNEUTRAL

VALVE 2

13．NEUTRALDAMPVALVE 14．RELIEFVALVE（FORREV） 15．RELIEFVALVE（FORFWD）

DAMPSOLVALVE） 23．PUMPTILTIROLLING CONTROL PRESSURE PORT

16．PORTB

（FORREV）

8．PUMPTII＿TROLLINGSPEED

17．PORTA

CONTROL VALVE 9．REGULATOR

18．NEUTRALDAMP

SOLENOIDVAI」VE

24．PUMPTILrROLLING CONTROL PRESSURE PORT

Fig・2・16 HSTPump（CircuitDiagram） 一34−

（FORFⅣD）

2．POWERTRAIN

（PUMPCOMBINATIONVAI．VEl）

Sectionalview B−B

SectionaIview A−A

SectionalviewC−C

6

Fig．2．17 HSTPump（3） −35−

2．POWERTRAIN

（PUMPCOMBINATIONVALVE2）

SectionaF viewA−A

SectionalviewC−C

Note：ThenumbersinthefigurecorrespondtothoseofthepartsnameshownonPage34・ Fig・2・18 HSTPump（4）

−36−

2．POWERTRAIN

Operation Thecylinderblockissplinedtotheshaft．Insidethecylinderblockisaplungerinserted．

ThepowerfromtheenglneistransmitteddirectlytotheshaftoftheHSTpump・Astheshaftrotates

Plungerrotatestogetherwiththecylinderblock． TheplungerslidesovertheshoeplateandmakesrecIPrOCatlngmOtionsinsidetheboreinthecylinder

blockaccordingtothetiltoftheswashplate，thusdrawingordischarglngthehydraulicoil．whic

dischargeportAorBistobeusedisdeterminedbytilt−rOllingcontroloftheswashplate・ Note：Thetravelingdirection（forwardorreverse）of

theloaderisdeterminedbywhichport（Aor B）oftheHSTmotorthepressureoilenters， followlngtheswitchingoverofthedischarge POrtSOftheHSTpump．

Pump discharge control Thepumpdischargeiscontrolledbytheplunger StrOkevarylngWithchanglngtilt−rOllingangleofthe

SWaShplate． Thetilt−rOllingangleoftheswashplatevarieswith thelateralmovementofthetwoservopIStOnS．Since SWaShplateisconnectedtoeachservopIStOn，itstilt−

rollinganglevarieswiththemovementofeachservo plStOn・

Fig．2．19

−37一

2．POWERTRA［N

2．2，2 PUMP CONTROL

TheHSTpumpISCOntrOlledbyacombinationofenglnerPm，PumPCOmbinationvalvesland2

Thepumpcombinationvalvelconsistsprlmarilyoftheregulator，inchingvalve，Cut−0ffvalve，P tilt−rOllingspeedcontroIvalve，andcontroIpressurebypassvalve・

Thepumpcombinationvalve2consistsprlmarilyoftheneutraldampvalveandtworeliefvalves （forfwdandrev）． Thepumpcombinationvalvelhasthefollowlngfunctions：

・Automotivecontrolbyregulator（pumptilt−rOllingcontroIperformedinproportiontoenginerpm） ●Controlbytheinchingvalve

●Controlbythecut−Offvalve

・Controlbythepumptilt−rOllingspeedcontroIvalve ●ControlbythecontroIpressurebypassvalve

Thepumpcombinationvalve2hasthefollowlngfunction：

●Controlbytheneutraldampvalve

−38一

2．POWERTRA［N

（1）Automotivecontrolbytheregulator（pumptilt−rOllingcontroIperfbrmedinproportionto enginerpm）

TheHSTmotorspeediscontrolledbychanglngtheHSTpumptilt−rOllingmotioninproportionto englnerPm・

Operation

①ThepressureoilfromtheHSTchargingpumis branchedintotwoflows：Oneflows，PaSSlng

throughthethrottleAtothecircuitPloandthe OtherflowstothereliefvalveA．

②AstheenginePeedincreases，thedischargefrom theHSTcharglngPumPalsoincreases．However，

becauseofthethrottleA，thedischargepressure

（A）fromtheHSTpumprisestoactuatetherelief ValveAsothatthepressureoilflowstothecircuit Phi． Thepressureofthepressureoilflowlngthrough

thethrottleAtothecircuitPlobecomeslowerthan thatofthepressureoilflowlngthroughtherelief

ValveAtothecircuitPhiduetothethrottleA， CauSlngaPreSSurediffbrentialbetweenthecircuits PhiandPlo．

③ sincethechargereliefvalveopensatapressure

Fig．2．20

Ofl・47MPa（15kgf／cm2）［213．2psi］，thepressureoilatthecircuitPlodoesnotchangesomuch

eveniftheenglneSPeedchanges．ThrottlesAandBareprovidedtowidenthepressuredifferential betweenthecircuitsPhiandPlo， WhentheenglneSPeedisatlowtomediumspeed，thepressuredifferentialbetweenthecircuitsPhi andPlobecomesequaltothatacrossthethrottleB．AstheenglneSPeedincreasesfurther，the

dischargefromtheHSTcharglngPumPalsoincreasessothattheflowofthepressureoilinthe

CircuitPhiisrestrictedbythethrottleB，thusmakingltSPreSSuretOincrease・Whentheoilpressure

inthecircuitPhiincreasesenoughtoreachthepressuresettlngOfthereliefvalveB，thereliefvalve

BopenstopreventthepressuredifferentialbetweenthecircuitsPhiandPlofromrislngfurther・

④EachofthetwoservopistonshasaPringwhichkeeptheswashplateoftheHSTpumpinthe neutralposition．WhentheshiftleverlSmOVedfromtheneutralposition，theFNRsolenoidvalveis

SWitchedoversothatthepressuredifferentialbetweenthecircuitsPhiandPloactsonthetwo SerVOPIStOnSaSatiltLrOllingcontroIpressureoftheHSTpump．

⑤whenthepuPtilt−rOllingcontroIpressureinthecircuitPhi（highpressure）overcomesthefo OfthesprlnglnSidetheservopIStOnattheopposite，theswashplatetilt−rOlls・

⑥ Astheenginespeedincreases，thepressuredifftrentialbetweenthecircuitsPhiandPloalsoincrease tomaketheservopIStOnSmOVelarger，thusincreaslngthepump

stilt−rOllingamount・

AstheenglneSPeedreduces，thepressuredifferentialbetweenthecircuitsPhiandPlobecomes

SmallerandthusthemovementoftheservopIStOnSalsobecomessmallertoreducethepump stilt rollingamount．

−39−

2．POWER TRAIN

Note：TheregulatorconsistsofthrottlesAand B，andreliefvalvesAandB．

CIRCUITP10

Fig・2・21Enginerunnlngatlowrpm

CIRCUFT Plo

Fig・2・22 Enginerunnlngathighrpm −40一

CIRCUIT Phi

2．POWER TRA［N

⑦ Thepump，storqueiscontrolledatavalueslightly higherthantheratedtorqueoftheenglnebythe

Pump displacement VOlume（Cm3／rev）

returnmomentmechanism（Seebelow）oftheHST PumP・

lnPuttOrque

⑧ whenaloadgreaterthantheenginetorqueacts OntheHSTpump，theenglneSPeedslightlydrops．

Since the regulator controIs the tilt−rOlling OPerationofthepumplnPrOPOrtiontotheenglne

￣三二＝≦三 Engineratedtorque ＼ 一←Engine smaxtorque ［二 HSTcircujtpressure

SPeed，theregulatorquicklyreducesthetilt−rOlling

Ofthepumptomatchthepump slnPuttOrquetO the engine

（Pa）

s rated torque（because a better Fig．2．23

OPeratlngfeelisobtainedbycontrollingthetilt−

rollingoperationofthepumpwhentheenginespeeddropsslightly）・

⑨whentheloadontheainsteeringpumpincreaseseOughtomaketheenginetorquein ．

OftheHSTpumpISreducedbytheregulatorsothattheHSTpump slnPuttOrquebecomessmaller・

WhenthesumoftheHSTpump slnPuttOrqueandthemainsteerlngPumP slnPuttOrquematC theengineratedtorque，theenginespeedstopsdroppingtopreventtheenginefromstalling（dueto

theanti−Stallfunction）． SWASH PLATE PLUNGER

Returnmomentmechanism

VALVE PLATE

① Thepressureoilisdeliveredthroughthevalve

Platetotheplungerinareasαandβwitha COnditionofα＜β．

② whenaloadisappliedontheHSTmotor，theoil PreSSureinthecircuitleadingfromtheHSTpump totheHSTmotorrisestoactontheinside ofthe

PlungeroftheHSTpump． （∋

Sincethereisadifferencebetweentheareaαand areaβatthehigh−PreSSureSideportofthevalve Plate，thepressureoftheoilwhichactsonthe

Plungerthroughtheareaβisgreaterthanthe PreSSureOfthe oilwhichacts ontheplunger through the areaα．The force of the area

differential（β−α）xcircuitpressurepushesthe bottomoftheswashplateasamomentuslngthe CenterOfthetilt−rO11ingasanaxis，thusmovlng

theswashplatetotheneutraldirection（return moment）．

④ThemVement（angle）oftheswashplates PrOPOrtlOnaltothepressureoftheHSTcircult

（betweentheHSTpumpandtheHSTmotor）・ WhenthecircultPreSSureislow，theangleisalso Small．AsthecircultPreSSurerises，theanglealso

becomesgreater．

Fig．2．24 −41−

2．POWERTRAIN

（2）Controlbyinchingvalve Changlngthepedaleffbrtontheinchingbrakepedal WillrestrictthedischargeoftheHSTpumpandthus

COntrOltheHSTmotorspeed． Operation

Note：Theinchingvalvewon toperateunlesstheleft brakepedal（inchingbrakepedal）ispressed； thatis，theinchingvalveiskeptclosed．

Forward travel

① Thepumptilt−rOllingcontroIpressureinthe CircuitPhiisconnectedthroughtheFNRsolenoid Valvetothecircuit，Whilethepumptilt−rOlling

COntrOIpressureinthecircuitPloisconnectedto

Fig．2．25

thecircuitA．

②Theinchingvalveislocatedbetweenthepumptilt−rOllingcontroIpressure ．

③ Theopeningoftheinchingvalvevariesinproportiontotheinchingbrakepedaleffort（StrOk Whentheinchingbrakepedalstrokebecomesgreater，thepressuredifferentialbetweenthepump tilt−rOllingcontroIpressuresofthecircuitsAandBbecomessmaller．

④ Astheinchingbrakepedalispressed，thepressuredifferentialbetweenthepumptilt−rOllingcon

PreSSureSOfthecircuitsAandBbecomessmaller，SOthatthetilt−rOllingamountoftheswashplate

OftheHSTpumpreducestodecreasethedischargeoftheHSTpump．ThisinturnreducestheHST

motorspeedtoreducethetravelingspeedoftheloaderinforwardgear・Inotherwords，yOuC

alsocontrolthetravelingspeedoftheloaderuslngtheinchingbrakepedal・

⑤sincey ．

Fig．2．26 Controlbyinchingvalve −42−

2．POWERTRAIN

（3）Controlbycut・Offvalve

TheHSTpump stilt−rOllinglSCOntrOlledaccordingtothesumoftheforwardtravelingpressureand maincircuitpressuretoreducethemaximumpressureoftheHSTcircuit，thuskeeplngthebalance

betweenthetravelingforceandbucketbreakoutforce． IndigglngWOrk，itisimportanttomatchtheliftforceoftheloadhandlingunittothetravelingpower

Indigging，adownwardforce（R）actsontheboomsoftheloadhandlingunitduetothetravelingpow （FK）．Ifthetravelingpower（FK）isgreaterthannecessarywhenliftingthebucket，thedownwardforc （R）actingontheboomsbecomesgreater，thusleadingtoaninsufficientbucketliftingforce（FL）． Ifthetravelingpower（FK）istoogreat，thetireswillskidtocausethemtowearaswellastoroughen

thegroundsurface，makingthegroundconditionbad．Topreventthis，the maximumpressure（traveling

POWer）intheHSTcircuitisreducedininverseproportiontotoemaincircuitpressuretoachievingthe matchingbetweentheliftforceandtravelingpower． Operation

① ThesumoftheforwardtravelingpressureintheHSTcircuitandthemaincircuitpressureactson thecut−0ffvalve．

② Asthepressureactingonthecut−0ffvalvepinbecomesgreaterthanthesetting，thepressureo

movesthespooltothelefttoconnectthecircuitsAandB・ ③ Thepressuredifferentialinpumptilt−rOllingcontroIpressurebetweenthecircuitsAandBbecomes

SmalleraccordingtothemovementofthespoolandthusHSTpump stilt−rOllingamounta

becomessmallertoreducethemaximumdischargepressureoftheHSTpump・IndigglngWOrk

themaximumpressureoftheHSTpumpISreducedbythecut−Offvalvetopreventthereliefvalve （forforwardtravel）fromoperating．

Inaddition，Sincethetilt−rOllingamountoftheHSTpumpreduces，theloadtotheenglnefrom

HSTpumpISalleviated．TheexcesspoweroftheenglnePrOducedbythisalleviationcanbeused

forthepowerdrivingthemain／steerlngPumP・

④Thecut−0ffvalveoperatesonthelinep−PObtainedbyconnectingthemaincircuitpressurandth

HSTcircuitpressure．Therefore，thepressureoftheHSTcircuitisdeterminedbythemalnCirc

PreSSuretOCOntrOltheoutputtorque（travelingpower）oftheHSTmotor・ Sincetheforwardtravelingpressureproducedwhenthecut−Offvalveoperatesislowerthanthe

reliefvalvepressureintheHSTcircuit（betweentheHSTpumpandHSTmotor），thereliefvalve

theHSTcircuitisdesignednottooperatetoproduceagoodheatbalance・

Fig．2．27 DigglngWOrk

Fig．2．28

2．POWERTRAIN

CIRCUIT B

CUT−OFF VALVE CIRCUITA

FWD TRAVELlNG PRESS

CUT−OFFVALVE

MAIN CIRCU［T PRESS

SPOOL pIN

Fig・2．29 ControlbyCut−0ffValve

−44−

2．POWERTRAIN

（4）Controlbypumptilt・rOllingspeedcontroIvalve

Thepumptilt−rOllingspeedcontroIvalvealleviatesarapidtilt−rOllingoperationofthepum achievesmoothaccelerationoftheloader．Inaddition，itpreventstheoccurrenceofcavitationinthe SerVOPIStOnCircuit．

Operation

① Thepumptilt−rOllingspeedcontroIvalveconsistsofathrottleandacheckvalveandislocated

betweenthecircuitsPlo（A）and（B）（PumPtilt−rOllingcontrollow−PreSSureCircuit‥thecircuitinto

Whichthepressureoilisreturnedbythelow−PreSSureSideservopIStOnWhenthepumptilt−rOlling COntrOlhigh−PreSSureSideservopistonoperates）．

②whenthecheckvalveisclosed，thereturnoilfromthecircuitPlo（A）flows， ．

thethrottle，thetilt−rOllingoftheHSTpumpchangessmoothlysothatthepumpdischargealso increasessmoothlyandthusacceleratetheHSTmotorspeedinasmoothmanner（thatis，theloader

s

travelingspeedissmoothlyaccelerated）．

③Iftheloadincreasesrapidlysuchaswhentheloaderhitsanobstacle，thetilt−rOllingoftheHS

PumPreturnSquicklytoneutral・TheoilreturnlngfromthecircuitPlototheservopIStOnisrestricte bythethrottletocausecavitationbetweenthecircuitPloandtheservopIStOn．Topreventthe OCCurrenCeOfcavitation，aCheckvalveisprovided．SincethepressureinthecircuitPlo（B）is

higherthanthatinthecircuitPlo（A），thepressureoilinthecircuitPlo（B）opensthecheckvalve

andflowstothecircuitPlo（A）tocompensatefortheinsufficiencyofoilthere（make−uPOPeration）・

ー45−

2．POWERTRAIN

CHECK VALVE CIRCし‖T P10（A）

THROTTLE C［RCUrT 円0（B）

テナー

Fig・2・30 WhenOilFlowsthroughThrottle

CHECK VALVE CIRCUIT 円0（A）

CIRCUIT P10（B）

シナ

Fig・2・31WhenOilFlowsthroughCheckValve

ー46−

2．POWERTRAIN

（5）ControlbycontroIpressurebypassvalve

ThecontroIpressurebypassvalvereturnstheswashplateoftheHSTpumptoneutral・ Operation

① whentheengineisnotrunning，thepressureoilfromtheHSTchargingpumpdoesnotactonth SPOOlofthecontroIpressurebypassvalveandthusitispressedtotherightbythesprlng・Sincethe CircuitsAandBareconnected，nOPreSSuredifferentialisproducedbetweenthepumptilt−rOlling COntrOIpressuresofthecircuitsAandB．Therefore，theservopIStOnWOn

tmovesothattheHS

PumPSWaShplateiskeptintheneutralposition・

②whentheengineruns，thepressureoilfromtheHSTchargingpmpactsonthespoolofthecontr PreSSurebypassvalveandmovesthespooltotheleftovercomlngthesprlngforce．

③ThecircuitsAandBareblockedbythecontroIpreSurebypassvalvespooltoproduceapressur

differentialbetweenthecircuitsAandB，thusmovlngtheservopIStOntOtilt−rOlltheHSTpum

SWaShplate．

−47−

2，POWERTRAIN

C［RCUITA

Fig・2・32 EnginenotRunnlng

from HST CHARGING

CトRCUIT B SPOOL PUMP

CIRCUIT A

SPRING

Fig・2・33 EngineRunnlng −48一

CIRCUIT A

2．POWERTRAIN

（6）Controlbyneutraldampvalve Whentheshiftleverisinneutral，theneutraldampvalvereturnstheoilfromthetravelingmotorto

thetravelingmotortoallowthetravelingmotortorotatefreely・ Operation In neutral

① whentheshiftleverisneutral，thepressureoilfromtheneutraldampsolenoidvalvedoesnotac OntheneutraldampvalvespooIsothatthespoolispressedtotheleftbythesprlng・Thecircuits

andBoftheHSTcircuit（betweentheHSTpumpandHSTmotor）areconnectedtoeachother throughtheneutraldampvalvespool．

② whentheshiftleverisputinneutralfromtheforwardpositionwhiletheloaderistravelingin forward，theswashplateoftheHSTpumpreturnstoneutral・ThepressureoilfromtheHSTmotor

flows，PaSSlngthoughneutraldampvalvespool，backtotheHSTmotor，Withoutbeingsuckedin

theHSTpump・Thethrottlerestrictstheflowofthepressureoilwhichpassesthroughtheneutra dampvalvespool．

③ TheoilfromtheHSTmotorflows，PaSSingthroughtheneutraldampvalvespool，backtotheHST motor・Therefore，Whentheshiftleverisshiftedintoneutralduringtraveling，theHSTmotorslows

downsmoothlytodeceleratetheloadersmoothly． Inaddition，Withtheshiftleverinneutral，yOuCantOWtheloaderbecausetheHSTmotorrotates．

Forwardandreversetravel

① whentheshiftleverisputintheforwardorreverseposition，thepressureoilfromtheneutrald SOlenoidvalveactsontheneutraldampvalvespooltomoveittotheright・ThecircuitsAandBof

theHSTcircuit（betweentheHSTpumpandHSTmotor）areblockedbytheneutraldampvalve SpOOl．

② TheoildischargedfromtheHSTpumpflowstoboththeneutraldampvalveandtheHSTmotor．

SincethecircuitsAandBareblockedbytheneutraldampvalvespool（areaC），thepressureoil

dischargedfromtheHSTpumpflowstotheHSTmotorwithout returnlngtOtheHSTpump，thus

rotatinglttOmOVetheloaderinforwardorreverse．

−49−

2．POWERTRAIN

THROTTLE

Fig．2．34InNeutral THROTTLE

2．POWERTRAIN

2．2．3 NEUTRAL DAMPSOLENOIDVALVE TheneutraldampsolenoidvalveisactivatedwhentheFNRsolenoidvalveisturnedon．（Whenthe

Shiftleverisputintheforwardorreverseposition）． Whentheshiftleverisputintheforwardorreverseposition，theneutraldampsolenoidvalvespool

movestotheleft・ThepressureoilflowsintotheportPintheneutraldampsolenoidvalve，PaSSing

throughthespoolandtheportA，tOmOVetheneutraldampvalve・

NEUTRAL DAMP SOLENOID VALVE

PORT A

PORT P

PORT P

NEUTRAL DAMP SOLENOID VALVE

Fig．2．36 NeutralDampSolenoidValve

−51−

2．POWERTRAIN

2．2．4 FNRSOLENOIDVALVE TheFNRsolenoidvalveswitchesoverthedirectionsofpumptilt−rOllingcontroIpressureinthe CircuitPhi． Note：TheoperationoftheFNRsolenoidvalveisexplainedusingtheoperationperformedwhenthe Shiftleverisplacedintheforwardposition，aSaneXamPle・

Operation

①whentheshiftleverisi†neutral，theFNRsolenoidvalvealsoremainsinneutral・Thepumpt rollingcontroIpressurelnthecircuitPhi（highpressure）flowsthroughtheportPintheF SOlenoidvalvebutdoesnotflowintotheportAorportBbecauseitisblockedbythespool，SOthat

itdoesnotactontheservopiston・Thepumptilt−rOllingpressureinthecircuitPlo（lowpressur

actsonbothservopIStOnSSOthattheywon，tmove，thuskeeplngtheswashplateoftheHSTpum

inneutral．

② whentheshiftleverisputintheforwardposition，theFNRsolenoidvalvespoolmovestothel

thusconnectlngtheportPtotheportBandtheportTtotheportA・ ③ Thepumptilt−rOllingcontroIpressureinthecircuitPhi（highpressure）enterstheportPoftheF SOlenoidvalve，PaSSlngthroughthespoolandportB，tOtheservopIStOn・

④Thepumptilt−rOllingcontroIpressurereturningfromtheservPistonenterstheportAofthe SOlenoidvalve，PaSSingthroughthespoolandportT，tOtheclrCuitPlo（lowpressure）．

⑤ TheservopistonmovesandtheHSTpumpswashplatetilt−rOllsintheforwarddirection．The PreSSureOildischargedfromtheHSTpumprotatestheHSTmotor，thusmovingtheloaderin forward．

−52−

2．POWERTRA［N

PORT A

PORT B

SPOOL PORT B

PORT A

（FWD）

（REV）

PORTP sERVO PORTT PISTON

Fig．2．37InNeutral

PORT A

PORT B

CIRCUIT Phi

SPOOL PORT B （FWD）

PORT P

SERVO

PORTT

円STON

Fig．2．38InForwardTravel −53−

PORT A （REV）

2．POWERTRAIN

2．3 HSTMOTOR L13．2

Ll ．2

Model

A6V86HA

A6V 115HAA

Type

VariabledeliverypIStOnmOtOr

←

（inclinedshafttype） Discharge（SuCtion）

Control

33．5−86．3cc／rev

38．0−114．7cc／rev

［0・00885−0．0228gal／rev］

［0．01004−0．0303gal／rev］

HA（high−PreSSuredependent，

←

COnStantPreSSureCOntrOl） Ⅵねight

46kg【1011bs］

49kg【1081bs］

﹁

一一

F 「￣￣￣

組

蓮 凪

澤訃・了一＝

／．

l

−・・−・・−・・⊥ ‥

■ り 」

11

1丁・・−

∴●∵

て一千；￣＝一二二三 ト＝」 − 1≡ し Jし j ！i ￣￣￣￣￣￣￣

l＝il■l ；：：コ ：lノ

⊥

「」

≠し ＿

空

＝監旦二塑⊥⊥二

￣−■−

T「￣−■T「7 主l

三 1 ニー

．．

⊥

「 戸爪． l

l −、 1 − しノ ＝l、ノ 鶴斡 l

】

！！

1

〔〕≡；〔

￣TT′

1

」i⊂：：二二＝＝：＝：二

l

」・q・j ￣￣￣「￣￣「￣￣￣￣￣￣￣ −

−・−・−・←・−・…・−・−・−・−・−・一喝「竜

」．＿．＿

i i

Note：圧＞紹＝ゝMatingsurfaces：LOCTITE＃51270r515 1．HSTMOTOR 2．（TRANSMISSION）

Fig．2．39 HSTMotor

ー54−

ll ll

￣￣−

1

2．POWERTRAIN

2．3，1GENERALDESCRIPT10N TheHSTmotorisaninclinedshafttypevariabledeliverypIStOnmOtOrCOnSistlngOfarotarygroup， regulator，mOtOrCOmbinationvalve，andmotortilt−rOllingspeedcontroIvalve・

VALVE PLATE REGULATOR

SHAFT

ROTARY ROTOR CONTROL ADJUSTMENT GROUP ROD

MOTOR TILT−ROLLING SPEED CONTROL VALVE

scREW

（Circuitdiagram）

1．PORTB

2．MOTORCOMBINATION VALVE 3．PORTX2 4．MOTORTIILROLLING SPEEDCONTROLVALVE

5．PORTT2（toHYDRAULIC OILTANK） 6．PORTTl（fromHSTPUMP）

7．PILOTPISTON 8．PILOTSELECTORVALVE

Fig．2．40 HSTMotor（1） −55−

9．PORTXl lO．FLUSHINGVALVE ll．THROTTLE （FLUSHING）

12．PORTA

2．POWER TRAIN

（HSTmotor） （Oppositeside：1）

AC〉−・−

Note：ThenumbersinthefigurecorrespondtothoseofthepartnamesshownonPage55・ View100kingfromA

View100kingfromB

Fig．2．41HSTMotor（2）

−56−

2．POWERTRAIN

（Regulatorandmotorcombinationvalve）

Fig．2．42 HSTMotor（3） −57−

2．POWERTRAIN

Operation Theoutputshaftoftherotaryshaftissupportedon themotorcaslngbytwobearlngSandisconnectedto thecenterholeoftherotorthroughthecenterpin．The rotorhasavalveplateonitsfrontend．Therotorisin

Closecontactwiththevalveplatewithasprlng・

Fig．2．43

Therotorhassevenplungersinsideit．Thepressure Oilfromthepumpflows，PaSSlngthroughtheportB Ofthevalveplate，intotherotor．Whentheplungers

arepressedbythepressureoil，theoutputshaftis

rotatedbythecomponentofforce（FV）oftheforce （F）pressingtheplungers． Astheoutputshaftrotates，therotoralsorotates．

TheplungersreachtheportAinturns，theoilreturns

tothehydraulicoiltank．Thedirectionoftravelofthe loaderisdeterminedbywhichportAMorBMthe

PreSSureOilflowsinto．

Fig．2．44

−58−

2．POWERTRAIN

2．3．2 REGULATOR

（1）Whenthemotorrotatesatahighspeed WhentheoperatlngPreSSureOfthemotor

islessthan23・2MPa（237kgf／cm2）［3365 PSi］（forL13−2）or25・7MPa†262kgf／cm2） ［3727psi］（forL16−2），thepilotpistonispressed

upwardbythesprlngforcetoblockoffthe COmmunicationbetweentheportsAandB．The

PORTA

POrtBandinternalpassageareconnectedto

PORT B

thedraincircuit・Sincetheinternalpassageis COnneCtedtothelargediameterchamber，the

largediameterchamberisalsoconnectedtothe draincircuit．TheportAisconnectedtothe

Smalldiameterchamberon which the motor

SPRING

OPeratlngPreSSurealwaysacts．Therefore，the

motoroperatlngPreSSureinthesmalldiameter ChambermovestheservopIStOnSdownward． ThecontrolrodconnectedtotheservopIStOnS movesboththevalveplateandtherotor．The SerVOPIStOnSrunSintotheplugandstopsthere

SOthatthemotor stilt−rOllingbecomesthe minimumtilt−rOllingposition．

Theplungerstrokebecomesminimaland

allowsthemotortorotateatahighspeed・

L13＿2：23．2 L13＿2：24±0＿5 L13＿2：24＿7 L16＿2：25．7 L16−2：26．5±0．5L16＿2：27．3

PLUNGER

ROTOR vALVE PLATE

Fig．2．45 WhenMotorRotatesatHighSpeed −59−

2．POWER TRAIN

（2）Whenthemotorrotatesatalowspeed

PILOT PISTON

WhentheoperatlngPreSSureOfthemotor ishigherthan24±0．5MPa（245±5kgf／cm2） ［3481±73psi］（forL13−2）or26．5±0．5MPa

‡270±5kgf／cm2）［3844±73psi］（forL16−2），

thepilotpIStOnispresseddownagalnStSPrlng tensiontoallowtheportsAandBtoconnect toeachother・TheoperatlngOilflows，PaSSlng

throughtheportsAandBandinternalpassage，PORTA intothelargeandsmalldiameterchambers．The SerVO PIStOnS mOVe uPWard due to the

PORT B

differenceinareabetweenthelargeandsmall

diameterchambers．Thecontrolrodconnected totheservopIStOnSmOVeSboththevalveplate androtortomakethemotor，stilt−rO11ingtothe maximumtilt−rOllingposition．Atthistime，the

Plungerstrokebecomesthemaximumandthe motorrotatesatalowspeed．

VALVE PLATE

PLUNGER ROTOR

Fig・2・46 WhenMotorRotatesatLowSpeed

−60−

2．POWER TRAIN

2．3．3 MOTOR COMBINAT10N VALVE

The motorcombination valveislocated atthe head section ofthe HST motorand consists ofa

flushingvalveandapilotselectorvalve・Thefunctionsoftheflushingvalveandthepilotselectorvalve aredescribedbelow． （1）Flushingvalve

TheflushingvalvereplacestheoilintheHSTcircuitbyescaplngtheoilatthelow−PreSSureSideto

thedraincircuitwhenreceivingboththehigh−PreSSureandlow−PreSSureOiloftheHSTcircuit（H PumPandHSTmotor）． Theoperationoftheflushingvalveisexplainedbelow，uSlngtheoperationinforwardtravelasan example． Whentheshiftleverisputinforward，theswashplateoftheHSTpumptiltro11sintheforward direction． TheHSTpumpsendshighpressureoilintotheHSTmotortodriveit．ThemotoroperatlngPreSSure

Oil（highpressureoil）dischargedfromtheHSTpumpflows，PaSSingthroughtheportA，mOt

COmbinationvalveinternalpassage，flushingvalvespoolinternalpassage，intothechamberCoft flushingvalve・Themotoroperatingpressureoil（lowpressureoil）returningfromtheHSTmotorflows，

PaSSlngthroughtheportB，mOtOrCOmbinationvalveinternalpassage，flushingvalvespoolintern PaSSage，intothechamberDoftheflushingvalve． SincethepressureinthechamberCishigherthanthepressureinthechamberD，thepressureoil

forcestheflushingvalvespooltotherightagalnStthesprlngtenSioninthechamberD・Themo OPeratingpressureoil（lowpressureoil）whichhasenteredtheportBflows，PaSSingthroughthenotch andthrottleoftheflushingvalve，tOthedrainport・Thethrottlerestrictstheflowtothedrainportto

keeptheoperatingpressure（lowpressure）betweentheHSTmotorandHSTpump・ （2）Pilotselectorvalve TheHSTmotorisregulatedbytheHSTmotoroperatlngPreSSure．Thepilotselectorvalvesendsthe forwardtraveloperatlngPreSSuretOtheregulatorwhentheshiftleverisputintheforwardpositionand

thereversetraveloperatlngPreSSuretOtheregulator whentheshiftleverisputinthereverseposition・ Thepilotselectorvalveisoperatedbythetilt−rOllingcontroIpressureofthetwoservopIStOnSOfthe HSTpump・Whentheshiftleverisputintheforwardorreserveposition，aPreSSuredifferentialis

PrOducedinthetilt−rOllingcontroIpressurebetweenthetwoservopIStOnSOftheHSTpumptoswitch OVertheflowsofthepilotselectorvalve． Theoperationofthepilotselectorvalveisexplainedbelow，uSlngtheoperationinforwardtravelas

anexample．

Whentheshiftleverisputinforward，thepumptilt−rOllingcontroIpressure（highpressure）actson

theportX2andthepumptilt−rOllingcontroIpressure（lowpressure）actsontheportXl・ SincethepressureinthechamberAofthepilotselectorvalveishigherthanthepressureinthe ChamberB，thepressureoilforcesthepilotselectorvalvespooltotheleftagalnStthesprlngtenSionof

thechamberBsothatthemotoroperatingpressure（highpressure）forforwardtravelwhichhasent theportAflowsthroughthepilotselectorvalvespoolintotheregulator．

−61−

2．POWER TRAIN

Pumptilt−rOrllng ．

SERVO PISTON

REGULATOR

Note：Flushingvalveandpilotselectorvalveinneutral．

Fig．2．47 MotorCombinationValve −62−

2．POWER TRAJN

2．3．4 MOTORTJLT・ROLLINGSPEEDCONTROLVALVE Themotortilt−rOllingspeedcontroIvalveconsistsofathrottleandacheckvalveandislocatedinthe internalpassagebetweenthelarge−diameterchamberandthepilotpIStOnOftheregulatortorestrictthe

flowofthehydraulicoilenterlngthelarge−diameterchamber，thuscontro11ingthetilt−rO11ingspeed

theswashtheHSTmotorswashplatetopreventthetravelingspeedfromslowlngraPidly・ （1）Changefromlowtohighspeed ① whentheservopistonsmovedown（towardthelarge−diameterchamber），thehydraulicoilflows OutOfthelarge−diameterchambertopushupthethrottlewhichinturncomesincontactwiththe

guidelwhilemakingagapbetweenthethrottleandguide2・ ② Thehydraulicoilfromthelarge−diameterchamberflows，PaSSingthroughthegapbetweenthe throttleandtheguide2，intotheholeinthethrottleandthenpassesthroughtheinsidethethrottle tothepilotpIStOnSide．

SincethehydraulicoilflowstothepilotpIStOnWithoutbeingrestrictedsomuch，thusthemotor

SPeedchangesfromlowtohighspeedquickly・

（2）Changefromhightolowspeed ①whentheservoistonsmoveupward（t？Wardthesmall−diameterchamber），thehydraulicoilflows fromthepilotpIStOnSideandpassesthroughtheguideltopushdownthethrottlewhichinturn

COmeSincontactwithguide2；thatisnogapISPrOducedbetweenthethrottleandtheguide2・ ② Thehydraulicoilfromthepilotpistonenterstheholeinthethrottleandflowspassingthrought insideandnotchofthethrottle，inthelarge−diameterchamber・Sincetheflowofthehydraulicoil leadingtothelarge−diameterchamberisthusrestrictedsothatthemotorspeedchangesfromhigh

tolowslowly．

Motorrotatingat10WSPeed

Fig．2．48 MotorTilt−rOllingSpeedControIValve −63−

2．POWERTRAIN

2・3・5STOCK・PILE＆SNOW（S＆S）MODE（OPTJONFORL16・2） ThefactthattheenglneOutPutisconstantmeans thattheforceavailableforliftingboomsbecomes

Smallerwhenagreattravelingpowerisused・By COntraSt，theboomliftingforceavailablebecomes greater when the traveling poweris small．The travelingpowerandthebucketbreak−Outforcearewell

matched・TheS＆Smodeisactivatedbyturnlngthe S＆S modeswitchonwiththeHi−Lo switchattheLo POSition． WhentheS＆Smodeisturnedon，themaximum travelingpowerissuppressedto75％ofthatobtained WhentheS＆SmodeisOFF．Therefore，WiththeS＆S Fig・2・49RelationshipofTilt−rOllingAngle modeturnedon，theboomliftingforceindigglng

andHydraulicPressureinS＆Smode

OPeration（COmPOSiteoperation ofscooping and

traveling）becomesgreaterthanthatobtainedwhentheS＆Smodeisoff．

Forthisreason，thescooplnglSeaSiertodowhentheS＆Smodeisoff．Inaddition，Sincethemaximu

travelingpowerissuppressedto75％，SnOWremOValoperationcanalsobe performedandeasily

efficiently．

Operation ① whentheHSTmotorworkingpressureismorethan26．5±0．5MPa（270±5kgf／cm2）［3844±

PSi］，thehydraulicpressureovercomestheregulatorspringforcetopushdownthepilotpiston．

ThisallowstheportsAandBtoconnecttoeachothersothatthemotorhydraulicoilflows，PaSSlng throughtheportB，intothelarge−diameterchamberoftheservopIStOn・TheHSTmotorhydraulic

Oilalsoflows，PaSSlngthroughtheportC，tOthesmall−diameterchambersoftheservopIStOnand

COntrOIpIStOn・Sincethereisadifferenceinareabetweenthelarge−diameterchamberand Small−diameterchamberoftheservopIStOnS，theservopIStOnSmOVeuPWard・

②whentheHi−LoswitchisintheLoposition，theHi−Losolenoidvalverelayisenergizedbyth

COntrOllertoenerglZetheHi−Losolenoidvalve，thuslettlngtheloadertravelingatlowspeed・

WhentheS＆Smodeswitchisturnedon，theS＆SmoderelaylSenergizedbythecontroll

energlZetheS＆Smodesolenoidvalve．

③ AstheS＆Ssolenoidvalvespoolismoved，theportCisconnectedtotheportDsothattheworki

PreSSureOfthemotoractlngOntheregulatorpilotpIStOnflows，PaSSlngthroughtheportsCandD，

intothelarge−diameterchamberofthecontroIpiston・

Theareadifferentialbetweenthelarge−diameterchamberandthesmall−diameterchamber COntrOIpistonforcesthecontroIpistondownward．

④whenthecontroIpistonmovesdown，itservesasastopperfortheservopiston．Whentheservo

PIStOnmOVeSuPWard，thetilt−rOllingamountofthemotorbecomeslarger・However，Withthecon

PIStOndown，theservopIStOnCOmeSincontactwiththecontroIpistonandstopsthere・Therefore，

thetravelingmotor smaximumtilt−rOllingangleissuppressedto75％tosuppressthetra POWer・

−64−

2．POWERTRAIN

SPRING S＆S MODESW s＆SMODE

S＆S SOL VALVE

／イ ﹁1ノL ふし

「 HST MOTOR

S＆S SOL VALVE

Fig．2．50 S＆SMode

−65−

Hi−Lo SELECTOR SOLVALVE

2．POWERTRArN

2．4 TRANSMISS10N L13．2 Model

Type

Ll ．2

TCM619−34

TCM639−34 ←

Constant−meSh，SPurgeartyPe

←

Speeds Clutch

Operation Pressure setting

←

Multiple−diskwettype

1サpe

Hydraulic

←

1・47−l・76MPa（15・0−18．Okgf／cm2）

←

［213．2−255．3psi］

Oil capacity

←

6．0−7．2L 【1・59−1．90USgal】

←

215kg【4741bs］

Ⅵ屯ight

ThetransmissioncontroIstheoutputoftheHSTmotorandsendsitthroughthepropellershaftsto thefrontandrearaxles．

ThetransmissionconsistsofanlnPutShaft，tWOClutches，fourgears，anOutPutShaft，aParkingb

andabrakecylinder．

Note：B＞ぢ：＝コ176−225N−m（18−23kgf−m） 【129．8−1661bf一札】

1．TRANSMISSION 2．（HSTMOTOR） 3．（REARFRAME） 4．MOUNTBRACKET し／￣−＼、ノ 3

＼ 2

Fig．2．51Transmission −66−

2．POWER TRAIN

りり臣臣りり臣監

臣匪匪匪臣匪臣匪匪 e t O N

58−74N−m（5．9−7．6kgf−m）［42．8−54．61bfLft］

1．SPEEDSENSOR 2．MAGNETPLUG

24．5±3．9N−m（2．5±0．4kgf−m）［18．1±2．981bf−ft］3．BRAKECYLINDER

52．1N−m（5．32kgf−m）【38．431bf−叫 10．6N−m（1．08kgf−m）［7．81bf−ft］

（9−13）

4．SOLENOIDVALVE 5．CONTROLVALVE

26．1N−m（2．66kgf−m）［15．91bf−ft］

6．0ILDIPSTICK

122・5±73N−m（12．5±7．45kgf−m†［83．0±53・81bf−ft］

7．PIPE

91．2N−m（9．31kgf−m）［67．31bf−ft】

9．CASE

81．2N−m（8．29kgf−m）［59．91bf−ft］

lO．SPRING

Threadedarea：LOCTITE＃572

12．PLUG

匝＞超＝ゝThreadedarea：LOCTITE＃262

8．STRAINER

］1．SPRING 13．0ILSEAL

匝＞Thespeedsensorshouldbedirectlyinstalledwithoutusing anyshim． Note：Attentionshouldbepaidtotheirdirectionwheninstallingoilsealsandpackings．

Fig．2．52 Transmission（1） −67−

2．POWER TRAIN

琶夢 Detai10farea K

Sectiona［viewXX

臣りり臣り監血

N

臣匪匪匪臣匪臣匪 e t

O

15−20N−m（1．5−2．Okgf−m）［11．1−14．81bf−ft］ 15±2・ON−m（1・5±0．2kgf−m）（11．1±1．51bf−ft） 9・8±2・ON−m（1．0±0．2kgf−m）［7．23±1．51bf−ft］ 24・5±3・9N−m（2・55±0．4kgf−m）【18．1±2．91bf−ft］ 69−78N−m（7．0−8．Okgf−m）［50．1−57．51bf−ft］ 56．5N−m（5．77kgf−m）【41．81bf−ft］

Threadedarea：LOCTITE＃572（afterdegreasing）

Threadedarea：LOCTITE＃572 1．CHOKE

7．SPRING

2．PLUG

8．PLUG

B．BRAKEBOOSTERDRAIN

3．PLUG

9．PARKINGBRAKE

C．HiCLUTCHPRESS．CHECKPORT

4．PLUG

10．PLUG

D．LoCLUTCHPRESS．CHECKPORT

5．VAI」VEPISTON

ll．BREATHER

E．LUB．OILPRESS．CHECKPORT

A．fr0rnCHARGINGPUMP

6．SPRING

F．HYDRAULIC SENSORCHECKPORT

Fig．2．53 Transmission（2） −68−

2．POWERTRAIN

1．INPUTSHAFT 2．HiCLUTCH 3．COVER 4．DRIVE GEAR 5．DRIVEGEAR 6．HOUSING 7．Lo CLUTCH 8．COVER 9．BRAKECASE lO．OUTPUTSHAFT ll．0ILSEAL 12．BRAKECOVER 13．SHROUD 14．DRIVENGEAR 15．DRIVENGEAR 16．OILSEAL 17．FLANGE Detai10f sectionalviewXX

り臣りりりり臣

臣匪匪匪臣匪臣 e t O N

18．SPEEDOMETERGEAR

52．1N−m（5．32kgf−m）［38．41bf−ft］

19．SHROUD 20．BUSHING

26．2N−m（2．66kgf−m）［19．31bf−ft］ 212．8N−m（21．7kgf−m）［1571bf−ft］

225．5N−m（23．Okgf−m）［166．31bf−ft］ 23．3N−m（2．38kgf−m）【17．21bf−ft］ 46．4N−m（4．73kgf−m）［34．21bf−ft］

13−16N−m（1．3−1．6kgf−m）［9．59−

Note：Attentionshouldbepaidto their direction when

installing oilseals，ball bearlngSandgears． Note：Forthe adjustment ofthe

11．81bf一魚］

匪＞紹＝ゝThreadedarea：LOCTITE＃262

匝＝＞Applymolybdenumdisulfidetosplines・ Fig．2．54 Transmission（3） −69−

Parkingbrake，referto

ADJUSTING PARKING BRAKE ．

3．2．4

2．POWERTRAIN

2．4．1CLUTCH SHAFT TheclutchshaftassemblyhasclutchpacksforHiandLospeedswhichconnectordisconnectthe

POWertranSmissionline． ldentification ldentification markings（2）

marking（1）

一†㌻二￣− ／′

￣￣￣￣毒蕪

（

￣〔き−￣−

ノー・ （ −−

B＞Detai10fareaA

〆声≒㌔ View100kingfromB HiCLUTCH PISTON MARKING 2 3 4

1

5

7 8 9 10

6

／／′■￣￣￣■−・・、

つ＝ミ ViewIookingfromC Lo CLUTCH PISTON MARKING

131415＜司16＜ヨ17 18 19

11 12

Note：B＞r⊂＝恥Slidingsurfaces：Grease 1．SHAFT＆DRUMASSEMBLY

2．PISTON 3．PLATE 4．DISK 5．GEAR（Hi） 6．GEAR（Lo）

7．SPRING

8．ENDPLATE 9．PISTON

15．SEALRING（OUTER）

lO．STEELBALL

17．SLEEVE＆DRUM

ll．ORIFICE

ASSEMBLY 18．SEALRING 19．PLUG

12．SEALRING（INNER）

13．RETAINER 14．RETAINER

16． 0 −RING

Note：TheabovesketchshowstheclutchshaftfortheL13＿2．Thestructureoftheclutchshaftm OntheL16＿2isthe same．

Fig．2．55 ClutchShaft −70−

2．POWERTRAIN

Operation

TheclutchisoperatedbypressureoilfromthetransmissioncontroIvalve・Thepressureoilfrom COntrOIvalveflowstothebackoftheclutchpistontomovetheclutchpistontotheleft・Theclutch

PIStOnthenlocksuptheclutchdisksandclutchplates，thusunltlngtheclutchshaft＆drumassemb

Withtheclutchhubtotransmitthepower・

1

2 3

4 5 E；：：：∃Pressureoil

l．CLUTCHHUB 2．CLUTCHDISK 3．CLUTCHPLATE 4．CLUTCHPISTON 5．SHAFT＆DRUM

ASSEMBLY from CONTROL VALVE

Fig・2．56 ClutchinEngagement

WithnopressureoildeliveredfromthecontroIvalve，theoilinthepIStOnisdischargedthroughthe

bleedvalvesothattheclutchpistonispushedbackbythereturnsprlng・ Thisunlockstheclutchdisksandclutchplatestoallowtheclutchshaftandclutchhubtorotate independentlysothatnopoweristransmitted．

1

2 3 4 5 6 7

1．CLUTCHHUB 2．RETURN SPRING 3．CLUTCHDISK 4．CLUTCHPLATE 5．BLEEDVALVE 6．CLUTCHPISTON 7．SHAFT＆DRUM

ASSEMBIX

Fig. 2.57 Clutch in Disengagement

ー71−

2．POWERTRAIN

2．4．2 TRANSMISS10N CONTROLVALVE

ThetransmissioncontroIvalveconsistsofasolenoidvalve，Selectorvalve，andaccumulator．Wh

theHi−Loswitchisoperated，theHi−Loselectorsolenoidisswitchedovertomovetheselectorvalvei

thecontroIvalve，thuscontrollingtheclutchoilpressure．

TRANSMLSSION CONTROL VALVE to CLUTCH SOLENOlD Hi Lo VALVE（Low

Circuit diagram

SectionalviewA−A

Note：B＞ぢ＝＝コ11・8N−m†1・2kgf−m）

4．PISTON

6．SOLENOIDVAINE 7．BODY 8．RANGEVALVE 9．SPRING

5・COVER

lO．CHOKE（￠1．2）

1．SPRING 2．STOPPER

［8．71bf一札］

3．SPRING

恒＞Valvetighteningtorque：

芯＝コ20−29N−m（2−3kgf−m） ［14．8−21．41bf一食］

B＞Capnuttighteningtorque： （忘＝＝コ6・9−9・8N−m（0・7−1kgf−m） ［5．09−7．231bf一札】

Fig．2．58 TransmissionControIValve −72−

2．POWERTRAIN

2．4．3 TRANSMISS10N CIRCUJT

① Thepressureoilfromthetransmission ChargingIbrakepumpflowsintotheHi− Lo transmission whereits flowis branched・Theoilpressureinthecircuit

iscontrolledtol．6tol．8MPa（16−18 kgf／cm2）【232−261psi］．Oneoftheoil

flowsbranchedinsidethetransmission acts on the Hi−Lo selector solenoid Valve and the selector valve before

PaSSingthroughthethrottleintothe accumulator．

② whentheHi−Loselectorswitchisput inthelowspeed（Lo）position，theHi−

Loselectorsolenoidvalveisturnedon andmovedtotheleft．Thepressureoil

WhichhaspassedthroughtheHi−Lo

Fig．2．5！）

Selector solenoid valve move the

Selectorvalvetotheleft，thusallowlngthepressureoilfromthetransmissioncharging化rakepump

toflowthroughtheselectorvalvetoactontheLoclutch．AsthepressureactlngOntheLoclutch increases，theclutchdisksandplatesarelockeduptoswitchoverthetransmissiontolowspeed （Lo）．

③ Theaccumulatorandthrottleareprovidedtoalleviateshockincurredbyclutchengagementwhen

theloaderspeedisswitchedoverfromhighspeed（Hi）tolowspeed（Lo）orviceversa・ Thatis，thepressureinthecircuitsafterthethrottlegraduallylnCreaSeSduetothethrottleand

accumulator（theperiodbintheabovesketch）．Duringthisperiod，theclutchislockedupgraduall

toalleviateshockcausedbyclutchengagement．

④ whentheHi−LoselectorswitchisplacedinHi，theHi−Loselectorsolenoidvalveandselector Valveareswitchedovertoallowthepressureoilfromthetransmissionbrakevalvetoflowintothe

Hiclutch，thusshiftingthetransmissionintohighspeedmode（Hi）．Theotheroperatingprinciple

thesameasforthelowspeedmode（Lo）．

ー73−

2．POWERTRAFN

SELECTO

i−LoSELECTOR OLENOIDVALVE（ON） TRANSMFSSION CHARGfNG／BRAKE PUMP

ELLEF VALVE

Hi−LoTRANSMISS10N

Fig．2．60 LowSpeed

i−Lo SELECTOR OLENOIDVALVE（OFF） TRANSMISSlON CHARGING／BRAKE PUMP

ELIEFVALVE Hi−LoTRANSMISS［ON

Fig・2・61HighSpeed −74一

2．POWER TRAIN

（1）Himode

① whentheHi−LoselectorswitchisputintheHiposition，thepressureoilisdeliveredtotheHi Clutch（2）．

② AsthepressureoilisdeliveredtotheHiclutch，thepiston（3）movestotherighttolockupthe Clutchplates（4）andclutchdisks（5），thusengagingtheHiclutch（2）．

③ withtheHiclutch（2）engaged，theinputshaft（1）isconnectedtotheHidrivegear（6）． ④ TheHidrivegear（14）issplinedtotheoutputshaft（15）．TheoutputoftheHSTmotoristransmitted throughtheinputshaft（1），Hidrivegear（6），Hidrivengear（14）totheoutputgear（15）whichis

thenrotatedatahighspeed．

Fig．2．62 HighMode

ー75−

2．POWERTRAIN

（2）Lomode

① whentheHi−LoselectorswitchisplacedintheLoposition，thepressureoilisdeliveredto Clutch（11）．

② AsthepressureoilisdeliveredtotheLoclutch，thepiston（10）movestothelefttolockup Clutchplates（8）andclutchdisks（9）toengagetheLoclutch（11）．

③whentheLoclutch（11）isengaged，theinputsh油（1）isconnectedtotheLodriveear（7）・ ④ TheLodrivengear（13）issplinedtotheoutputshaft（15）．TheoutputoftheHSTmotorlStranSmit

throughtheinputshaft（1），Lodrivegear（7），andLodrivengear（13）totheoutputshaft（15）whic

isthenrottedatalowspeed．

Fig．2．63 LoMode

−7（ト

2．POWERTRAIN

2・4・4QU［CKSHIFTSWITCH（QSS）（OPT10N）

Whenoperatlngthetruck，theoperator，shandsareusua11yfu1l，Withhislefthandgrabbingthesteerl Wheelandhisrighthandcontrollingtheloadhandlinglever・Thequickshiftswitch，locatedonthegrlP

Oftheloadhandlinglever，allowstheoperatortoswitchovertheloader

stravelingspeedmodes（Hiand

Lo）easilyandsmoothlyatatouchoftheswitch．

Operation

① Thecontrolleralwaysdetectstheloader，stravelingspeedthroughthetransmissionrotationsensor aswellastheOn−0ffstatusoftheQSSandHi−Loswitch．

②whenthefollongconditionsaresatisfied，yOuCanSWitchoverthetransmissionspeedmod fromHitoLouslngtheQSS．

●TheHi−Loswitchonthedashboard：Hiposition ●Theloader

stravelingspeed‥1essthan5km／h［3．1mph］

●QSS：Pressed・（TheearthcircuitfromthecontrollertotheQSSiscompletedsothatthecontroller recognizesthedepressionoftheQSSasthesignal．）（TheQSSisamomentarytypeswitch．）

ThecontrollerenerglZeStheHi−Losolenoidvalverelaytoallowthecurrentfromthe＃9fusetofl totheHi−Loselectorsolenoidvalvetoturniton，thusswitchingoverthetransmissiontoLo・ Note：Whentheloader

stravelingspeedismorethan5km／h［3．1mph］，yOuCannOtSWitchovert

transmissionspeedmodefromHitoLo．EveniftheQSSsignalissenttothecontroller，

COntrOllerjudgesthattheconditionformodechangeisnotsatisfiedandthusdisablesthesignal

fromtheQSS．

③whenthefolloヤngconditionsaresatisfied，yOuCanSWitchoverthetrans叫Sionspeedmo fromLotoHiuslngtheQSS．

●TheHi−Loswitchonthedashboard：Hiposition ●Theloader

stravelingspeed：1essthan13km／h［8．1mph］

●QSS：Pressed・（TheearthcircuitfromthecontrollertotheQSSiscompletedsothatthecontroller recognizesthedepressionoftheQSSasthesignal．）（TheQSSisamomentarytypeswitch．）

ThecontrollerstopsenerglZlngtheHi−Losolenoidvalverelay．Therefore，theHi−Losolenoidvalve

turnedofftoswitchoverthetransmissionspeedmodetoHi・

④TheQSSfunctioniscanceledwhentheengineisshutoff・Ifthegineisshutoffaftert transmissionisswitchedovertoLobytheQSfunction，thetransmisslOnSPeedmodeisputinHi

Whentheenglneisrestarted．

−77−

2．POWER TRAIN

TRANSM（SSI ROTATlON S Hi−Lo SELECTOR SOLVALVE

TRANSMISS10N

Switchingpattern Speedrangewherespeedchangeispossible． SwitchingwithHi−Loselectorswitch

k

H

0

1−0 くうlIi

lii→1」0

L

13km／h［8．1mph］

5 8

EnabledwhentravellngSPeed islessthan13km／h［8，1mph］ ‡ftheswitchisoperatedatatravelIngSPeedof morethan13km／h［8．1mph］，themodeswitches

OVerf（OmHitoLowhenthetravellngSPeeddrops lessthan8km／h［5．Omph］．

Switching with QSS

Hi−Loswitchis 10CkedtoHi

H

f王i→tノ0

Gnpofload QSS ◎ handlinglever

Lo→Jll

Fig．2． 4（〕SS

−78−

Enabledwhen

km／h［3．1mph

】

travellngSPeedislessthan5 EnabIedwhentraveIlngSPeed

2．POWERTRAIN

2，5 PROPELLERSHAFT

Universal joint

L13．2

L16．2

CrossJOint

←

478mm［18．8in．］ 915mm［36．Oin．］

503mm［19．8in．］ 927mm［36．5in．］

111mm［4．4in．】

←

23kg［50．71bs］

24kg［52．91bs］

Length（inter−Pindistance）

Front Center Rear Ⅵねight

Front＋CenterPrOPeller shafts Rear propeller shaft

5kg【11．01bs］

←

Thepropellershafts，locatedbetweenthetransmissionandthefrontaxleandbetweenthetransmission andtherearaxle，tranSmitsthepowerfromthetransmissiontothefrontandrearaxles・ Thepropellershaftsabsorbthechangeindriveangleandthechangesinlengthwhentheloader travels，enSurlngSmOOthflowofpowerfromthereductiongeartotheaxles・

Note：B＞ぢ＝：：＝コ70・6−77．4N−m（7．2T7．9kgf−m）［52．1−57．11bf−ft］，

14＝ゝThreadedarea：LOCTITE＃262 B＞（芯＝コ223・4N−m（22・8kgf−m）［164．81bf−ft］ 匡＝＞Installspline−Sidejointtotransmissionoutputshaft．

B＞Releaseparkingbrakebeforeinstalling． Note：ThegreasenlPPlesshouldbepolntedtothesamedirection．

Fig．2．65 PropellerShaftAssembly

−79−

2．POWERTRAIN

（Frontandcenterpropellershafts）

Note：圧＞ぢ＝コ17・2−1・ON−m（1・76−0・10kgf−m）［12・7−0・7381bf−ft］

B＞ぢ＝＝コ265−304N−m（27−31kgf−m）【195．5−224．21bf−ft］

1．CROSSBEARING 2．SHAFTYOKEASSEMBLY 3．GREASEFITTING

4．PILLOWUNIT 5．SPLINEYOKE 6．ENDPLATE

7．LOCKPLATE 8．SLEEVESHAFTASSEMBLY

（RearPrOPellershaft）

1．CROSS BEARING 2．COUPLINGYOKE

Fig．2．66 PropellerShafts

−80−

2．POWERTRAIN

2・6DRJVEAXLES（FRONTANDREAR） L13＿2

Ll ＿2

Driving

4−Wheeldrive

←

Frontaxle

Frame−fixed，Semi−floatlngtyPe

←

Rear axle

Trunnion，Semi−floatlngtyPe

←

Reductiongearanddifferential Model

TCM619−30

TCM641−30

Type

Ordinarytype，2−Stagereduction

←

Differential gear box

On−PleCetyPe Torque proportional differential

←

Differential limiter Finalreductiongearassembly Model

Type

←

TCM619−30

TCM641−30 ←

Planetarygeartype

Ⅵねight

Frontaxle Rearaxle

393kg［866．41bs］

490kg［1080．31bs］

385kg［848．81bs］

485kg【1069．21bs］

2．6．1AXLE

Thedriveaxleconsistsofadifferential，finalreductiongearassembly，WettyPebrakeunit，andaxle Shaft．

Thepowerfromthedriveunitistransmittedthroughthepropellershaftstothefrontandrearaxle Thepoweristhentransmittedtothedifferentialwhereitisdividedintotherightandleftaxleshaftsto thefinalreductiongearassemblyoneachshaftend，thusdrivlngthewheel・ Thewettypebrakeunitisinstalledinfrontofthefinalreductiongearassemblyandservesasa SerVicebrake・Fortheoperationoftheservicebrake，referto

3．BRAKESYSTEM．

Axlemount Thefrontaxleisbolteddirectlytothefrontframe・ Therearaxleissupportedbythetrunnionmethodinwhichaxlesupportsareinstalledacrosstherear

axleandboltedtotherearframe・Consequently，therearaxleiscradledupanddownaroundthecent

lineofthedifferentialaccordingtothegroundconditiontheloadertravels・

Thetrunnion−mOunteddriveaxlehelpsimproveoperatorcomfortbecauseloaderswithatrunnion

mounteddriveaxlejoltlessthanthosewiththeconventionalcradle−SuPPOrteddriveaxle，Whent

travelonabadgroundcondition．

−81−

2．POWERTRAIN

1

Note：臣＞（忘＝コ100・9±19・6N−m（10．3±2kgf−m） ［74．4±14．51bf−魚］，

紹＝ゝThreadedarea：LOCTITE＃262 駐＞ぢ＝：：コ509・6±98N−m（52±10kgf−m） ［375．9±72．31bト氏］ B＞r⊂＝恥Innersurface‥Grease （Installwithchamferedpartpointedtoaxle．）

B＞Installwithlippointedoutward．

Detai10farea B

匠＞Insta11withgroovepointedtoplate（7）． 匪＞「⊂＝恥Fillgreasebeforeinstalling．

1・FRONTAXLE

4．AXLESUPPORT（REAR）

2．REARAXLE

5．PACKING 6．BUSHING

3．AXLESUPPORT（FRONT）

7．THRUSTPLATE 8．THRUSTCAP 9．THRUSTWASHER

Note：ThesketchesshowtheaxlesoftheL13−2．TheaxlesoftheL16−2havethesamestructurea OftheL13＿2． Fig・2・67 DriveAxleAssembly −82−

2．POWERTRAIN

7 8＜こ司

9 10

Note：B＞ E：：コ88N−m（9kgfLm）【64．91bf−ft］，疋＝ゝThreadedarea‥LOCTITE＃262 B＞ぢ＝コ225N−m（23kgf−m）［166．01bf−ft］，正＝ゝThreadedarea：LOCTITE＃262

B＞血Threadedarea：LOCTITE＃572 B＞l⊂＝：恥Lip：Grease

匝＞紹＝ゝMatingsurfaces：LOCTITEFMD−127

1．OILSEAL 2．AXLESHAFT 3．DIFFERENTIALBODY 4．DIFFERENTIAL 5．PLUG（CHECKPORT）

6．FINALREDUCTIONGEAR ASSEMBLY 7．AXLETUBE

lO．PIN 11．BREATHER

8．OILDIPSTICK 9．RINGGEAR

13．BLEEDER 14．DRAINPLUG

12．COVER

Note：ThesketchesshowthefrontaxleoftheL13＿2．ThefrontaxleoftheL16＿2hasthesamestruct asthatoftheL13＿2． Fig．2．68 FrontAxle −83−

2．POWER TRAIN

Note：圧＞（妄：：：コ88N−m（9kgf−m）［64・91bf−ft］，正＝ゝThreadedarea‥LOCTITE＃262 B＞ぢ＝コ225N−m（23kgf−m†［166．01bf−ft】，紹＝ゝThreadedarea：LOCTITE＃262 B＞紹＝ゝThreadedarea：LOCTITE＃572 B＞〆＝＝恥Lip：Grease

匡＞正＝ゝMatingsurfaces：LOCTITEFMD−127 1．0ILSEAL

6．AXLETUBE

2．AXLESHAFT 3．DIFFERENTIALBODY 4．DIFFERENTIAL

7．RINGGEAR 8．PIN

5．FINALREDUCTIONGEAR ASSEMBLY

9．BREATHER lO．COVER

11．BLEEDER 12．OILDIPSTICK 13．PLUG（CHECKPORT）

14．DRAINPLUG

Note：ThesketchesshowtherearaxleoftheL13＿2．TherearaxleoftheL16＿2hasthesamestruc thatoftheL13＿2． Fig．2．69 RearAxle −84−

2．POWERTRAIN

2．6．2 DIFFERENTLAL Thedifferentialisintegralwiththereductiongear・ Thepowerfromthepropellershaftsistransmittedthroughthedriveplnionandtheringgeartothe

differentialgearcase・Itisthensentthroughtherightandleftsidegearstothefinalreductiongear・Th

Speedreductionofthepowerisaccomplishedbetweenthedriveplnionandtheringgear・ Thedifferentialoperatesasn）1lows：

Whiletheloadertravelsstraight，theringgeardifferentialgearcase，andsidegearsrotatetogether

Withtheplniongearsinsidethedifferentialgearcasenotrotatlng・Thepowerofthesamespeedist transmittedfromtherightandleftsidegearsthroughtheaxleshaftstothewheels・Whentheloader

makesaturn，therightandleftwheelsrotateatdifferentspeeds；theplniongearsinthedifferentialgea

CaSerOtatearOundtheirownaxesaccordingtothedifferenceinspeedbetweentherightandleftgear Whiletravelingst，raight

While makin

1．PINIONGEAR 2．SIDE GEAR 3．AXLESHAFT 4．DIFFERENTIAL GEAR CASE 5．SPIDER 6．DRIVEPINION 7．RINGGEAR

4

56

7

Fig・2・70 DifferentialGearOperation

Torque proportional differential

Wheelloadersoftenneedtoworkonabadgroundconditionsuchasonsandorinaswampyplace・

Onsuchabadgroundcondition，aloaderwiththeconventionaldifferentialcanskid，thusmakingl

difficulttodeliveritsperformance・Inaddition，thetireswillalsowearoutprematurely・Topreventt

fromhappenlng，SOmemOdelsmaycomeequlPPedwithatorqueproportionaldifferentialwhichlimits differentialaction．

Thetorqueproportionaldifferentialhasalmostthesameconstructionasthestandarddifferential

assemblyexceptthatthedifferentialplniongearshaveanoddnumberofteethofaspecialcontour・ Whenthetiresareabouttoskidonsoftground，theplniongearscontinuetotransmltPOWertObothside gearswithoutidlinguntilthedifferenceinroadresistancebetweentherightandlefttiresreachesa Certainpolnt，thuspreventlngthetiresfromskidding・

一85−

2．POWERTRAIN

Note：B＞ぢ＝＝コ9N−m（0・9kgf−m）［6・61bf−ft］，14＝ゝThreadedarea‥LOCTITE＃262 B＞（芸＝コ23N−m（2・3kgf−m）［17・01bf−ft］，疋＝ゝThreadedarea‥LOCTITE＃262 R＞ぢ＝＝コ55N−m（5・6kgf−m）［40・61bf−ft］，紹＝ゝThreadedarea：LOCTITE＃262 B＞紹＝ゝOuterdiameter：LOCTITE＃262，〆＝＝恥Lip：Grease 匪＞Backlashbetweenringgearandpiniongear：0．20−0．28mm［0．0079−0．0110in．］ B＞Shima句ustmentinarangefromO．55tol．55mm［0．0217toO．0610in．］（Bothsides）

1．0ILSEAL

7．THRUSTWASHER

13．COVER

2．BEARINGRETAINER

8．THRUSTⅥ7ASHER

14．0ILSEAL

3．CASEB

9．PINIONGEAR

15．SHIM

4．RINGGEAR 5．CASEA 6．SHIM

lO．BEARINGCAGE

16．SPIDER

ll．SPACER 12．FLANGE

17．PINIONGEAR 18．SIDEGEAR

Fig．2．71Differential −86一

2．POWERTRAIN

2．6．3 FINALREDUCT10N GEAR

Thefinalreductiongearassemblyisaplanetarytypeandprovidesfinalspeedreductionofthepower

fromtheenglneinthepowertransmissionline・ Thepowerfromthedifferentialgearrotatestheshaftandthethreeplanetgearsinsidetheringgear・ Therotationoftheplanetgearsistransmittedtotheplanetcarrierandthentotheaxleshaft・

←：Powerf10W

SectionalviewA−A

1．DRIVEPINION 2．DIFFERENTIAL

4．PLANETSHAFT 5．PLANETGEAR

3．GEAR＆SHAFTASSEMBLY

6．RINGGEAR（FIXED）

Fig．2．72 PowerFlow −87−

7．PLANETCARRIER 8．AXLESHAFT

2．POWER TRA［N

14151617

Note：B＞Imprintedsurfaceshouldbepointedtopiston． 駐＝＞Shima叫ustmentprocedure l）Tightenthebolt（12）tothetighteningtorqueof49N−m（5kgf−m）［361bf−ft］andpushin axleshaftbearlngCOne，turnlngaXleshaft．

2）Measurespacingbetweenretainerplate（11）andaxleshaft．Measuredvalue＝Y

3）ChooseshimswhosethicknessisO．03−0．10mm［0．0012−0．0039in．］greaterthan

valueY． 4）Installshimsandinstallretainerplateandbolt．

ぢ：：：＝コ644N−m†65・7kgf−m）［4751bf−ft］，超＝ゝThreadedarea‥LOCTITE＃262 Thebearing

srotationalresistancetorqueis19．6−24．5N（2−2．5kgf）［4．46−5．511bf］

Onthetubefittingboltpitchcircle． 1．PLANETCARRIER 2．SHAFT

7．ENDPLATE

13．GEAR＆SHAFTASSEMBLY

14．PIN

3．BALL

8．BRAKEDISK 9．BRAKERING

4．PLANETGEAR

lO．SHIM

5．RINGGEAR 6．NEEDLEROLLER

ll．RETAINERPLArE 12．BOIJ

16．PISTON 17．DRING

15．DRING

Fig・2．73 FinalReductionGearAssembly

−88−

2．POWERTRAIN

2・7WHEELASSEMBLY（TJREANDWHEEL） L13．2 Tire Wheel（rim）

Ll ＿2

16．9Ⅹ24−10PR

18．4x24−10PR

Tubelss，L−2

Tubelss，L−2 W16Lx24

W15Lx24

Weight（PerPiece） Tire Rim

91kg［200．61bs］

118kg［260．11bs］

54．2kg［119．51bs］

57kg［125．71bs］

235kPa（2・4kgf／cm2）［34．1psi］ 216kPa（2．2kgf／cm2）［31．3psi］

Inflationpressure

2．7．1TIRE

Thestandardmodelisprovidedwithlock−tyPeL−2tireswhichfeaturehightraction・Selectapproprla tiressincethereareavarietyoftiresavailableaccordingtotheapplicationandpurposeofwork・

Thetiresizeisexpressedininches・Thestrengthoftiresisexpressedinplyrating（PR）：forexample 10PRmeansastrengthcorrespondingtothatoflOpiecesofcottoncords．（PRdoesnotnecessarily Standforthenumberofcordpliesinthetire．）

Example：

16．9 ￣T

Tirewidth（in．）

一千

Rimdiameter（in．）

10PR

Tire strength

T

2．7．2 WHEEL Thewheelconsistsoftherimanddisk．Thediskisboltedtotheaxleshaft．

ThetireisinstalledontherimandbothserveasonepleCe・Itisthusimportanttouseanapproprla rimwheninstallingatireontherim・Theuseofaninapproprlaterimmayresultinashortlifeofthet andintheworstcasemightleadtoaseriousaccident・Therimsizeisalsoexpressedininches・Thefirst numberstandsfortherimwidthandthenextonetherimdiameter．

−89−

2．POWERTRAFN

（Tire）

1．TIRE 2．RIM 3．VALVE

（Treadpattern）

（Rim）

1．RIM 2．VALVEGUARD 3．DISK

Note：B＞ぢ＝コWheelbolt‥863±40N−m（88±4kgf−m）［636・5±29・51bf−ft］

Fig．2．74 TireandRim

ー90−

3．BRAKE SYSTEM

3．BRAKESYSTEM Servicebrake

Type

Frontandrearwheelindependentbraking，Wetdiskhydraulic，

Numberoffluidline

boostertype Independent21ines

Brake valve

Tandembrakevalve

Diskbrake

Four−Wheel，WettyPediskbrake

Brakepump Oiltank

ThetransmissionchargepumpISuSedl）

Brake oil pressure

3．3MPa（34kgf／cm2）［483．6psi］

0．28L［0．073USgal］

Alarmdevice Safety device

Parkingbrake Type

Transmissionmid−Shaftbraking，internalexpansion（SPring）

type Location

Transmission

Note：1）Forthespecificationandconstructionofthebrakepump，referto

6・2PUMP

ADonotshutofftheenginewhiletheloaderisrunning．Iftheenginestallswhiletheloaderis runnlng，theparkingbrakewi11beautomaticallyappliedtobraketheloaderrapidly・

−91−

3．BRAKE SYSTEM

3．1SERVICE BRAKE 3．1．1GENERALDESCRIPT10N（BRAKEL暮NE） （1）Servicebrakeline Theservicebrakeisa4−Wheel，WettyPediskbrakeandusesthefu11−POWerbrakesystem．

Thehydraulicbrakelinehasanindependent2−1inesystemforthefrontandrearwheels．Ifon

twolinesisdamagedforanyreason，yOuCanbraketheloaderuslngtheotherline．However，its

benotedthatwhenonebrakelineisdefective，thebrakingforcedropsandyouneedtoglVealonger Pedalstroketobraketheloader． （2）Safbtyandalarmdevices

●Yourloaderisequippedwithabrakevalve（Oil−OVerbooster）・Ifthepumpstops，yOuCanO

brakingfbrceinproportiontoyourbrakepedaleffortbypresslngthebrakepedalforcefu11y．Howeve

itshouldbenotedthatthebrakepedalisharderthanusualandthebrakingforceislow．

A Donotshutofftheenginewhiletheloaderisrunning．

●Thebrakeoiltankhasalevelswitchinsideit．Whenthebrakeoilleveldropsbelowthespecifi Value，theoperatorwillnoticeitimmediatelybywayofthe

dashboard．

−92−

brakeoillevel

warnlnglampon

3．BRAKE SYSTEM

（め：tOTRANSMISSIONCONTROLVALVEandPARKINGBRAKE 便）：tOTRANSMISSIONHOUSINGDRAINPORT Note：Specificationsandapplicationsofswitches Position

A

B

Name

OFFwhenpushrodispushed．

Stoplampswitch Stoplamp Level switch （insideoiltank）

Specifications

Application

ONwhenpushrodisreleased．

Brakeoillevel warninglamp

1．BRAKEPEDAL 2．BELLCRANK

4．TRANSMISSIONSUMPTANK

3・BRAKEVAINE

6．TRANSMISSIONINLINEFIIJER

ONwhenlevelislow．

7．BRAKEOILTANK

5．TRANSMISSIONCHARGINGPUMP

Fig．3．1ServiceBrakeLine −93−

8．WETTYPEDISKBRAKE

（Incorporatedinaxle）

3．BRAKE SYSTEM

to TRANSMlSSlON CONTROL VALVE

1．TRANSMISSION 2．STRAINER 3．TRANSMISSION CHARGING PUMP 4．TRANSMISSION INLINE FTLTER

5．BRAKEPEDAL 6．BRAKEVALVE 7．BRAKEOILTANK 8．PRESSURE SWITCH 9．DISKBRAKE（FRONT） 10．DISKBRAKE（REAR）

Fig・3・2 BrakeOilPressureCircuitDiagram −94−

11．FILTER 12．PARKINGBRAKE SOL VALVE 13．PARKINGBRAKE 14．RELIEFVALVE

3．BRAKE SYSTEM

Operation

（1）Brakepedalinneutral

①whenthebrakepedal（1）isnotprSSed，thebrakevalve（3）isinneutral・

TheoildischargedfromthetransmlSSionchargingpump（5）flows，PaSSingthroughtheinlinefilter （6），tOthebrakevalveinletport．

Thepressureoilthenflowsthroughthebrakevalvepowercylinderandoutletporttothetransmission COntrOIvalve．

②Thebrakeoilpressurelineofthediskbrake（8）isconnectedthroughthebrakevalvemastercylinder tothebrakeoiltank（7）．Therefore，thediskbrakeisinthereleasedstate．

Fig．3．3 BrakePedalinNeutral

ー95−

3．BRAKE SYSTEM

（2）Brakepedalpressed

① whenthebrakepedal（1）ispressed，thepushrodofthebrakevalve（3）ispushedthrought bellcrankto activatethevalve．

②Insidethebrakevalvepowercylinder，thepowerpistonismovedbythepressurefromthepump， WhiletheresidualoilpressureissenttothetransmissioncontroIvalve．

③Insidethebrakevalvemastercylinder，thesecondaryandprimarypistonsmovetosendthebra Oiltothediskbrake（8）tooperateit．

Fig．3．4 BrakePedalPressed

（3）Brakepedalreleased Whenthebrakepedal（1）isreleased，thebrakevalve（3）returnstoneutral．

Thebrakeoilactivatingthediskbrake（8）returnsthroughthemastercylindertothebrakeo （7）．Thebrakeoilpressureisthusremovedandthediskbrakeisreleased．

−96−

3．BRAKE SYSTEM

3．1．2 BRAKEVALVE Thebrakevalveisanoil−OVerboosterwhichbooststhemastercylinderoilpressureinproportionto thebrakepedaleffort，uSlngtheoildischargedfromtheoilpumpasaboostlngSOurCe・ Thebrakevalve，COnSistingofabooster（POWerCylinder）andatandemmastercylinder，OPerateSaS

fo1lows：Whenthebrakepedalispressed，thespooIconnectedtothebrakepedalnarrowsthevariab

OrificetodeliverboostedoilpressuretothepowerpIStOnOfthebooster，thusactivatlngthetandem mastercylinder． Thefeelofoperationisobtainedbyacombinationofthepedalstrokefollowlngthestrokeofthe tandemmastercylinderpIStOnandthereactionforceproducedbyfeedingbackthebrakeoilpressure

generatedinthetandemmastercylinderfromthereactionpIStOn・Thisprovidesfinebrakecontrol・ Evenifthepumpfailstooperatenormallyforanyreason，thebrakepedaleffortisapplieddirectlyto

thetandemmastercylindertoachievethebrakingforceinproportiontothepedaleffort（fail−Sa mechanism）．

」 「 ′Ⅶ、

Note：B＞ぢ＝＝コ29・4−34．3N−m（3．0−3．5kgf−m） ［21．7−25．31bf一明

B＞（E：＝コ24・5−37．3N−m（2．5−3．8kgf−m） ［18．1−27．51bf−叫 −−−・・−−−＿＿岬一㌦ノ

View100ki「唱f「OmZ

1．INLETPORT

3．DRAINPORT

2．OUTLETPORT

4．TANKPORT

Fig．3．5 BrakeValve −97一

5．BRAKEPORT（2）

3．BRAKE SYSTEM

（Powercylinder）

151617

1

2

8 9 （Mastercylinder）

10 111213

20

25 24 21

23 22

1．JOINT

10．SPRING

19．SECONDARYPISTON

2．PUSHROD

ll．CONNECTOR 12．SPRING

20．CONNECTOR 21．PRIMARYPISTON

3．DUSTCOVER 4．SPOOL

13．ROD

22．CUP

5．0ILSEAL 6．BODY

14．RELIEFVALVE 15．SPRING

23．SPRING 24．STOPPER

7．CYLINDERCOVER

16．PLUG

8．POWERPISTON 9．SPRING

17．SETSCREW 18．BODY

25．CUP 26．SPRING

Fig．3．6 BrakeⅥ11ve −98−

3．BRAKE SYSTEM

Operation （1）Brakevalvenotactivated

①whenthepushrodconnectedtothebrakepedalisreturned，thespool（1）andconnector（5）assembly andpowerpiston（4）arealsoreturnedtothecylindercover（3）side．

②Therefore，theprim？ryPiston（7）andsecondarypiston（6）ofthemastercylinderremainattheir respectivehomeposltlOnS，Withthepressurechambers（DandC）（Chambersconnectedtothebrake POrtS）areopenedthroughthereliefporttotheoiltank．

（2）Brakevalveactivated

①Thepressureoilfromtheoilpumpflows，PaSSingthoughthepowercylinderinletport，therear

Chamber（A）ofthepowerpiston（4），throttlepassageformedbythespool（1）andthepowerpiston （4），andthefrontchamber（B）ofthepowerpiston（4），tOtheoutletport．

② whenthebrakepedalispressed，thespool（1）advancesthroughthepushrodconnectedtothe Pedaltonarrowthepassagebetweenthepowerpiston（4）andthespool（1）． Therefore，aPreSSuredifferentialisproducedbetweentheh・Ontandrearchambers（AandB）ofthe POWerPiston（4）toforcethepowerpiston（4）tomoveforward，thuspushingtheconnector（5），

Whichinturnactivatesthesecondarypiston（6）ofthemastercylinder．

3

A 4

5

B

1．SPOOL

4．POWERPISTON

2．RELIEFVALVE 3．CYLINDERCOVER

5．CONNECTOR

6

6．SECONDARYPISTON

Fig．3．7 BrakeValveOperation

−99−

C

7

D

7．PRIMARYPISTON

3．BRAKE SYSTEM

③ whenthesecondarypiston（6）advancestoproducepressureinsidethepressurechamber（C），the PreSSureisalsosenttothereactionchamberbuiltinthesecondarypIStOn．ThereactionpIStOn

（Small−diameterpiston）retractsandhitsthefrontendofthespool（1）・Thepressureproduc themastercylinderisthustransmittedthroughthepushrodasanoperatlngreaCtionforcetothe

pedal． ④ Thepressureproducedinthepressurechamber（C）ofthemastercylindersecondarypistons

alsomovestheprimarypiston（7）forwardtoproduceapressureinthepressurechamber（D） Primarypistonside・Thepressureproducedinboththechambers（CandD）flowsoutofthebr POrttOCreateabrakingaction．

⑤TheoilpressureinthepowercylinderiscontrolledbythepreSureSettingofthereliefvalve（ Whichisinturndeterminedbythemastercylinder

sspecificatlOnPreSSure．

（3）Safbtydevice

①Ifthehydraulicircuitatthepowercylindersidefailstooperatenormally，yOuCanaCtuateth

mastercylinderpIStOnthroughthespool（1）andconnector（5）bycontrollingthebrakepedal．

② Themastercylinderisatandemtypesothatifeitherthefrontortherearlinefailstoop normallydueto，forexample，Oilleaks，yOuCanaPPlythebrakeuslngtheothernormalline．

（4）Whenthebrakeisreleased

①whenthebrakepedalisreleased，thenarrowedoilpasagebetweenthespool（1）andthe

Piston（4）isopenedtotheoriginalstateandthepowerpIStOn（4）andconnector（5）arereturn thecylindercover（3）side．

②Fo1lowingthemovementofthepowerpiston（4）andtheconnector（5），theprimar ．

respectivepressurechambers（CandD）openedthroughthereliefporttotheoiltank．

−100−

3．BRAKE SYSTEM

3．1．3 DISK BRAKE Thediskbrakeisawet，Slngle−Platetypeandbuiltinthedifferentialbodyofthedriveaxle・Onthis

loader，fourdiskbrakeunitsareinstalledonthefourwheels，Oneforeach． Forthestructureofthediskbrake，referto

2．6DRIVEAXLE．

Operation （1）Brakeinoperation WhenthebrakeoilactsonthebackofthebrakepIStOn，thebrakediskislockedupwiththebrake

rlngandendplate・Theinnerperipheryofthebrakediskissplinedtotheshaftinthepowertransmis line・TheouterperipheryofthebrakeringandendplatearesecuredtothedifferentialbodybyplnS thatthelockedupbrakediskstopsrotatlngtObraketheloader・ （2）Brakereleased WhenthebrakeoilpressureactlngOnthebrakepistonisreleased，thebrakepIStOnreturnSSlightlyto makethebrakediskfree，thusreleaslngthebrakingforce・

1．AXLESHAFT 2．PLANETCARRIER 3．SHAFT

4．BRAKEDISK

7．BRAKERING

5．ENDPLATE 6．PIN

8．BRAKEPISTON 9．DRING

Fig. 3.8 Disk Brake Operation

−101−

3．BRAKE SYSTEM

3．1．4 BRAKE OILTANK Thebrakeoiltankholdsoiltobedeliveredtothebrakevalvemastercylinder．Thebrakeoilisused

foroperatlngthediskbrakes．

Brakeoiltobeused：EngineoilSAE5W−20 Capaclty：

1・OL［0・26USgal］（total），0．28L［0．07USgal］（reservoir）

A Donotusethegenera）automotivebrakefluid（JISautomotivenon・mineralbrakeflu Otherwisetherubberpartsofthebrakesystemmightbedamagedtocausethebraketofailto OPeratenOrmally，thusresultinglnaSeriousaccident．

UsethemineralbrakefIuidn）rthebrakesystemofyourloaderl

Note：Max．：283cc［17．3in3］ Min．：150cc［9．2in3］

1．CAP 2．STRAINER 3．BRACKET 4．LEVELSWITCHASSEMBLY

Fig．3．9 BrakeOilTank

−102−

3．BRAKE SYSTEM

3．2 PARKING BRAKE

Manualreleasingofparkingbrake（asanemergencymeasure）A Iftheparkingbrakecannotbereleasedwiththeparkingbrakeswitchduetoadefectivepumporfor anyotherreason，yOuCanreleasetheparkingbrakemanua11ybyuslngParkingbrakereleasebolt・

AManuallyreleasingtheparkingbrakeshouldnotbeabused．Itshouldbelimitedt。adisable

loaderneedingtobetowedtoanout・Of−trafficarea・Donottrytodrivetheloaderbyitsown englne・Iftheparkingbrakeneedstobereleasedwiththeloaderparkedonaslope†besureto blockthewheels．

Manua11yreleasingtheparkingbrake

① TurntheparkingbrakeswitchON． Note：Theparkingbrakecanbeforcefullyreleased

inthe followingprocedureevenwhenthe Parkingbrakeswitchison．

② Removetheplug（1）ofthetransmissionparking brakecylinder． （Beforeremovingtheplug（1），makesurethe

Parkingbrakeoiltemperatureislowbecausethe Oilflowsouttheplughole．）

Fig．3．10

③ Loosenthereleasebolt（2）locknut，remOVethe releasebolt（2）andthenremovethelocknutand WaSherfromthebolt．

④ washthethreadedareaoftheremovedbolt（2） andinsertitintotheholefromwhichtheplug（1） hasbeenremovedandtightenuptothefarend．

⑤ Asthebolt（2）istightened，theshaft（3）ispushed totheleftsideinthefigure．Tightenthebolt（2）

untilitnolongermovesanyfurthertoreleasethe

Fig．3．11

Parkingbrake．

Fig．3．12 −103一

3．BRAKE SYSTEM

3．2．1GENERALDESCRIPT10N（BRAKELINE） Theparkingbrakeisaninternalexpansiondrumbrakeandinstalledonthetransmissionoutputshaft． Theparkingbrakeisoperatedwiththeparkingbrakeswitchintheoperator

SPRING

scompartment．

PISTON

TRANSMISS10N CHARGING／ BRAKE PUMP

Hi−LoTRANSMISSlON

Position

④

Name

Specification

Use

Pressureswitch Transmissionclutch

OFF：0・64MPa（6・5kgf／crn2）［92．8psi］

（Parkingbrake SWitch）

ON：0・27MPa（2・8kgf／cm2）［39．2psi］

Cut−0ffand parking

brake

indicationlight

Theswitchisturnedonatatmosphericpressure．

Fig．3・13 ParkingBrakeLine

ー104−

3．BRAKE SYSTEM

Operation （1）Releasingparkingbrake

WhentheparkingbrakeswitchisplacedtotheOFF（releaseposition），theparkingbrakesoleno

ValveisturnedONtoallowthebrakereleasepressuretoactonthepIStOn，thusforclngthepistontothe

lefttocompressthesprlng・Thepushrodalsomovestothelefttomovetheparkingbrakelevertothe left（releaseposition），thusreleasingtheparkingbrake．

Theparkingbrakeisreleasedbyhydraulicpressure・Therefore，eVeniftheenglneStallswitht ParkingbrakeswitchOFF，theparkingbrakesprlngautOmaticallyactuatestheparkingbrake・

PARKING BRAKE SOL VALVE

】：l

Hi−LoTRANSMISSlON

CAM SHAFT

BRAKE SHOE BRAKE DRUM

RETURN SPRING

Fig・3・14 ReleaslngParkingBrake −105−

3．BRAKE SYSTEM

（2）Applyingparkingbrake

WhentheparkingbrakeswitchisturnedON（applicationposition），theparkingbrakesolenoidvalv

isturnedOFFsothatnobrakereleasepressureactsonthepIStOn．ThepIStOnisthuspushedtotheright

bythesprlngandthereforethepushrodalsomovestotheright・Thisforcestheparkingbrakelev theright（applicationposition）toapplytheparkingbrake・

PARKING BRAKE SOL VALVE

l：l

」

HトLoTRANSMISS10N

CAM SHAFT

BRAKE SHOE BRAKE DRUM

RETURN SPRLNG

Fig．3．15 ApplyingParkingbrake −106−

3．BRAKE SYSTEM

3．2．2 PARKING BRAKE ELECTRFCCIRCUIT

Theparkingbrakeelectriccircuitconsistsofaparkingbrakeswitch，Parkingbrakerelays（1，2），a

aparkingbrakereleasesolenoid．

Functionofparkingbrakerelays ●Parkingbrakerelay（1）

Theparkingbrakerelay（l）turnsonandofftheparkingbrakereleasesolenoidwhentheparking brakeswitchisturnedonandoff． ●Parkingbrakerelay（2）

Theparkingbrakerelay（2）completesthepowerholdingcircuitwhentheparkingbrakeswitchis turnedoff．

Note：Inthecircuitdiagramshownabove，thepowersupplyisOFFandtheparkingbrakeswitc ON．

Fig・3．16 ParkingBrakeElectricCircuit

−107−

3．BRAKE SYSTEM

（1）ParkingbrakeswitchinOFF Aftertheenginehasbeenstarted：

1．WhentheparkingbrakeswitchisturnedtotheOFF（1）position，theparkingbrakerelay（2

activatedtoallowthepowerfromthebatteryrelaytoflowtotheparkingbrakerelay（1），t

actuatlngtheparkingbrakereleasesolenoidvalvetoreleasetheparkingbrake． 2．Theparkingbrakerelay（2）holdstheparkingbrakereleasepower．

Fig．3．17 ParkingBrakeinOFF

ー108−

3．BRAKE SYSTEM

（2）ParkingbrakeswitchinON Aftertheenginehasbeenstarted： Whentheparkingbrake（1）isapplied，POWerisnolongersuppliedtotheparkingbrakerelease

SOlenoidvalveandthustheparkingbrakeisapplied・

Fig．3．18 ParkingBrakeinON

−109−

3．BRAKE SYSTEM

3．2．3 PARKING BRAKE Theparkingbrakeisaninternalexpansiontypedrumbrakewithitsbasefittedtothetransmission CaSeandthedrumtothetransmissionoutputshaft．

Brakelining：452mmx50mmx5．45mm［17．8in．xl．97in．xO．22in．】

SectionaIviewA−A 聖

10

貰 SectjonalviewC−C

Sectionalview B−B

Note：B＞ぢ＝コ6・9−12・7N−m（0．7−1．3kgf−m）［5．09−9．371bf−ft］ 1．SUPPORTPLATE

7．SHOECUP

13．WYWASHER

2．LINING

8．SHOEPIN

3．ADJUSTER 4．SPRING

9．ⅥJASHER

14．SPRINGWASHER 15．LEVER

lO．COVER

16．BOLT

ll．BRACE 12．CAM SHAFT

17．HEX．NUT

5．SPRING 6．SHOESPRING

Fig・3・19 ParkingBrake −110−

3．BRAKE SYSTEM

3．2．3 ADJUSTING PARKING BRAKE

ANotethattheoilintheparkingbrakeandcylindersishotaftertheloaderhasmoved．Make Suretheparkingbrakeiscoldbefbretryingtoadjusttheparkingbrake；Otherwiseyoumight

burnyourhand． ①parktheloaderonalevelsurface，lowerthebucketonthegroundandshutofftheengine．Turnon theparkingbrakeswitch・Inaddition，blockthefrontandrearwheelssecurelytopreventtheloader

from rolling unexpectedly.

② Releasetheparkingbrakemanually．（Fortheprocedure，SeePagelO3．） ③ Markthedrum（8）andflange（9）andthenremovethe6bolts（7）andcover（6）fromthedrum（8）． ④ Turnthedrum（8）sothattheadjustmentwheel（11）isvisiblethroughthebrakeadjustmenthole（5） inthedrum（8）andplacethebrakea句ustmenthole（5）downward．

⑤Insertthescrewdriver（12）intothebrakeaqjustment（5）andturntheadjustmentwheel（11）clockwise untilitnolongermovesanyfurther．Backoffthea叫ustmentwheel（11）counterclockwisellteeth．

Note：Afterthestep⑤iscompleted，thegap（C）betweenthebrakeshoe（13）anddrum（8）isO．25mm ［0．0098in．］

⑥ Turnthedrum（8）toalignthematchmarkonthedrum（8）withthematchmarkontheflange（9）． Installthecover（6）andbolts（7）onthedrum（8）．

⑦ cancelthemanualreleaseoftheparkingbrakeusingthereverseorderofstep②． Note：Starttheengine．Thrntheparkingbrakeswitchonandoff．Makesurethatthestroke（A）

Ofthelever（10）is15−20mm［0．59−0．79in．］．

ー111一

3．BRAKE SYSTEM

／2

1．PLUG 2．BOIJ 3．SHAFT 4．BRAKECYLINDER 5．BRAKEADJUSTMENTHOLE

6．COVER

11．ADJUSTMENTWHEEL

7．BOLT

12．SCREWDRIVER 13．BRAKE SHOE

8．DRUM 9．FLANGE lO．LEVER

Fig．3．20 ParkingBrake −112−

4．STEERING SYSTEM

4．STEERLNGSYSTEM Type

Frame−articulatingtype

Mechanism

Orbitrol type

Framearticulatingangle

400torightandleft

NumberofrotationsofsteerlngWheel

4．3

Powersteerlng Model

0rbitrol（LPHG9D） Separate type

「吋pe

Pressure setting Steering pump

17．2MPa（175kgf／cm2）［2490psi］

Usedalsoasmainpumpl）

SteerlngCylinder

Type

Double−aCtlngPIStOn

Quantity

2

Cylinderstroke

395mm［15．6in．］ 15kg［33．11bs］

Weight（PerCylinder）

Note：1）Forthespecificationsandstructureofthemainpump，referto

4．1GENERAL DESCRIPT］ON ThesteerlngSyStemisaframe−articulatingtypewhichsteerstheloaderbyoperatlngthetwosteerlng

Cylindersbetweenthefrontandrearframes．

Fig．4．10rbitroITypeSteerlngSystem −113−

6．2PUMP．

4．STEERING SYSTEM

Thesteeringmechanismisorbitroltype（fu11−hydraulicpowersteering）whichdoesnotuseanylin mechanism，butoperatesonhydraulicpoweralone・

Thesteeringsystemconsistsofthesteeringwheelunit，Orbitrol，Priorityvalve，CuShionvalve（L16−2 0nly），Steeringcylindersandhydraulicpiping・

AIfthepressureoilisnotsuppliedfromthepumpfbranyreasonsuchaswhentheenginestalls， theorbitrolactsasamanualsteerlngSyStem）thusmakingitpossibletosteertheloadeTlⅡowev notethatsteerlngOPerationisconsiderablyharderthanusual・

PR10RITY VALVE

STEERING CYuNDER

Note：TheabovesketchdoesnotillustratethehydraulicpIPlng・ ForthehydraulicpIPlng，referto 6・HYDRAULICSYSTEM・ Fig．4．2 SteeringSystem −114−

4．STEERING SYSTEM

4．2 01LCIRCULAT10N ROUTES TheoilpickedupfromtheoiltankbythemainpumpISSentunderpressuretotheprlOrltyValve

Whereitisdividedintotwoportions：Oneforthemainhydrauliccircuitandoneforthesteerlnghydraulic ClrCult． ThesteerlnghydrauliccircuitusestheloadsenslngSyStemWhichletsthesteerlnghydrauliccircuit takeprlOrltyOVerthemaincircuitsothattheorbitrolreceivesthenecessaryamountofoilfromthe Pr10rltyValve，Withtheresidualamountofoilbeingsenttothemaincircuit・ WhenthesteerlngWheelisturned，theoilissentintoonesteerlngCylinder・Theoildischargedfrom

theothersteerlngCylinderreturnsintotheorbitrolfromwhichitreturnsintotheoiltank．

TheL16−2uSeSaCuShionvalveforthecylindercircuit・ Note：FortheoperationoftheloadsenslngSyStem，refertoH4・5PRIORITYVALVE・

Fig．4．3HydraulicCircuitDiagram −115−

4．STEERING SYSTEM

4．3 STEERJNGWHEEL UNIT Thesteeringwheelunitisinstalledinthecockpit．Belowitisthesteervalve（Orbitrol）・ WhenthesteerlngWheelisturned，therotationistransmittedthroughthesteerlngShaftwhichinturn actuatestheorbitrol．

Steerin

wheel unit

Note：B＞（忘＝コSteervalvemountingbolt‥ 34．3−40．2N−m（3．5−4．1kが−m） Sectionalviewof steerin

［25．3−29．61bf一氏】

wheel unit

B＞「⊂＝恥Splines：Molybdenumgrease R＞紹＝ゝWater−PrOOfseal 匪＞〆＝＝恥Grease

B＞疋⊃ゝSyntheticrubberadhesive 1．STEERINGWHEEL 2．STEERINGWHEELUNIT 3．MOUNTRUBBER 4．BRACKET

5．SOUND−ABSORBINGMAT

9．BEARING

6．STEERVALVE

10．COLUMN ll．STEERINGSHAFT

7．BUSHING 8．GROMMET Fig．4．4 SteerlngWheelUnit −116−

4．STEERING SYSTEM

4・4STEERINGVALVE（ORBITROL） TheorbitroIconsistsofthecontroIvalvesectionandtherotorsetsection． ThecontroIvalveisarotaryvalvetypewhichchangesovertheoilpassagesbyrotatlngltSelf，tO SteerlngCylinders．

TherotorsetislocatedunderthecontroIvalve・Usually，1taCtSaSanOilmotortoperformmeter

function・Inanemergency，1tisusedasahandpumpandactsasamanualsteerlngunit・ R

L

」

T LS P （Circuitdiagram）

L，R：CYLINDERPORT

P：PUMPPORT T：TANKPORT LS：LOAD SENSINGPORT

Note‥臣＞ぢ＝＝コ28・4N−m（2・9kgf−m）【20・91bfイt］ Fig．4．5 0rbitrol −117−

4．STEERING SYSTEM

SectionaIviewofA−A

1．ENDCAP

9．NEEDLEBEARING

17．BALL

2．SPACER 3．SPACERPLATE 4．DRIVE

lO．OILSEAL ll．SEALGLANDBUSHING

18．CHECKVALVEBODY 19．CHECKVALVEPOPPET

12．DUSTSEAL

5．HOUSING 6．SPOOL

13．RETAININGRING

20．GUIDE 21．SPRING

14． 0 −RING

22．ADAPTERSCREW

15．FLArSPRING

23．GEROTOR

7．SLEEVE 8．PIN

16．CENTERINGSPRING

Fig．4．6 0rbitroIStructure −118−

4．STEERING SYSTEM

ORBITROL OPERATION

（1）SteeringWheelinNeutral TheoilfromPportflowsintothecavitybetween

thespool（2）anddriveshaft（3）throughthesmall OPeningsofthesleeve（1）andthespool（2）．Theoil

inthecavltyflowsoutfromtheTportthroughthe upperpartofthedriveshaft，andnotchgrooveofthe

SPOOlandsleeve・TheRandLports（Cylinderports） areclosedbythespool．

Fig．4．7 NeutralState

（2）nLrningSteeringWheelCounterclockwise WhenthesteerlngWheelisturned，COunterClockwise，

thespool（2）isrotatedwithrespecttothesleeve（1）to Closetheneutralflowpassage（Smallopenings）．

TheoilfromthePportpassesthroughthechanged OVerSleeveopenlngS，SPOOlgrooveandsleeveopenlngS andissenttotherotorsetsectionthroughtheoilpassage Ofthehousing（4）torotatetherotor（5）．

Theoildischargedbyrotationoftherotorissentto thecontroIvalvesectionandthenflowsfromtheLport

intothesteerlngCylinderthroughthesleeveandspool・ TheoildischargedfromthesteerlngCylinderreturns totheRportandnowsoutfromtheTportthroughthe Sle占veandspool．

Fig．4．8 CounterclockwiseRotation Note：Whentherotorrotates，thedriveshaftandthe Sleeverotatetogether・Namely，ifthesteerlng

Wheelisturnedtorotatethespool，thesleeve isalsorotatedequally，therebynullifyingspool displacement．Consequently，the rotoris

rotated，COrreSPOndingtotherotationangleof thesteerlngWheel，andtheoildisplacedbythe rotorissenttothesteerlngCylinder．Inactual Steering the following motion ofrotor to

SteerlngWheelisexecutedcontinuously・

Fig．4．9 RotorSetSectioninOperation 一119−

4．STEERING SYSTEM

（3）TurningSteeringWheelClockwise WhenthesteerlngWheelisturnedclockwise，the rotorrotatesinadirectionoppositetodirectionofrotor

rotated when the steering wheel is turned

COunterClockwise，therebyinverslngOilintakeand dischargebytherotor． TheoilflowsfromtheRportintothesteering

Cylinders，andtheoildischargedfromthesteerlng CylinderreturnstotheLport．

Fig．4．10 ClockwiseRotation （4）EmergencyOperation Whenthehydraulicoilisnotsuppliedfromthe PumPduetoenglneStOP，theorbitroIservesasan emergencysteerlngunit． Whenthe steering wheelisturned，rOtationis transmittedtothedrive shaft（3）andthe rotor（5） throughthespool（2）andcrosspin（6）． Therotor，Putintorotation，drawsinoil．Negative

pressureiscreatedintheoilpassage，SOthatthecheck

Valve（7）isopenedtodrawinoilfromtheTport． Theoildischargedfrom SteerlngCylinderthroughthe

the rotor is sent to the Cylinderporttochange

thedirectionoftheloader．

Theoildischargedfromthe toanothercylinderportand

SteerlngCylinderreturnS is drawninto therotor

throughthecheckvalve（7）． Note：Incaseofemergency Wheelis harder to

OPeration，thesteerlng turn than in normal

OPeration．

−120−

Fig・4・11Emer亭enCyOperation（Clockwise

RotatlOn）

4．STEERING SYSTEM

（5）Centerspringoperation

WhenthesteerlngWheelisturned，thecenterlngSPrlnglSCOmPreSSedcorrespondingtotheclearance

betweenthecrossplnandspool・WhenthesteerlngWheelisreleasedorlocked，thesleeveisrotate

thecenterlngSPrlngtenSiontoreturnthesteerlngWheeltoneutral・Theloadercontinuestoturna

turnlngangleuntilthesteerlngWheelisoperatedagain・Thus，thecenterlngSPrlngtenSionactsasfeedb

OfthesteerlngmeChanism．

（6）Pportcheckvalveoperation Theorbitrol

sPporthasacheckvalveinstalled．

Thecheckvalveoperatesasfollows： WhenthesteerlngWheelisturnedclockwiseandthesteeringcylinderreachesitsstrokeend，the

PreSSureattheRportoftheorbitrolrisestothesettlngValue・Whenyourhandisreleasedfromthe SteerlngWheelatthispolnt，theentiresystemreturnstoneutral，buthighpressureoilremainsattheR

POrtbecausethecylinderportsideisblocked． WhenthesteerlngWheelisthenturnedslowlytotheclockwisedirection，theRportoftheorbitrolis

COnneCtedthroughtherotortothePport・Therotorturnsmomentarilyduetotheresidualpressurea RporttolettheoilflowbacktothePport・ TherotorismechanicallylinkedtothesteerlngWheelandthusthesteerlngWheeltriestoturninthe

direction（COunterClockwise）oppositetothedirectionyouwanttoturn．Tbpreventthisfromhappening

acheckvalveisinstalledatthePportoftheorbitrol・

−121−

4．STEERING SYSTEM

4．5 PRJORITYVALVE TheprlOrltyValvecombineswiththeorbitroltoformtheloadsensingsysteminwhichboththe SteerlngSyStemandthehydraulicsystemcanbeefficientlydrivenbyaslnglepump． TheprlOrltyValveisprovidedwithareliefvalveforthesteerlnghydrauliccircuit．

A

J

駐＞111213く召 SectionalvjewA−A

Note：D＞ぢ：：：＝：コ20・6N−m（2・1kgf−m）［15・21bf−ft］

B＞ぢ＝コ44・1N−m（4・5kgf−m）【32・51bf−ft］ 匪＞6：：：：：コ24・5N−m（2・5kgfⅦ）【18・11bf一円

P：Pumpport（frommainpump） T：Tankport（tooiltank） LS：Loadsensingport（fromorbitrol） P

EF：Maincircuitport（tocontroIvalve）

CF：Steeringcircuitport（toorbitrol）

1．HOUSING 2．SPOOL 3．SPRING

（Circuitdiagram）

5．BALL 6．BALLHOLDER 7．SPRING

10．PLUG ll．BODY 12．FILTER

4−9．RELIEFVALVE

8．ADJUSTMENTSCREW

13．PLUG

4・SCREEN

9・BODY

（Orifice：0．6mm［0．0236in．］ dia．）

Fig．4．12 PriorityValve −122−

4．STEERING SYSTEM

LoadsenslngValveoperation

Theloadsensingsystemletsonlytheamountofoil（OutOfthedischargedfromthemainpump necessaryforsteerlngOPerationflowintotheorbitrol，WhilelettlngalltheremainlngOilflowintothe loadhandlingsystem（COntrOIvalve）．

Forexample，WhenthesteerlngWheelisinneutral，mOStOftheoildischargedfromthemainpumpI

directedtothecontroIvalvefortheoperationoftheloadhandlingsystem・ Thisallowsefficientuseoftheoildischargedfromthemainpump，thusmakingthehydraulicsystem mOreenergy−SaVlng・ （1）Steeringwheelinneutral（enginenotrunning）

Whentheengineisnotrunning，thepriorityvalvespool（1）ispressedtotheleftinthefigureb COntrOIspring（2）tension，thuskeepingtheCFportfu11yopenandtheEFportfu11yclosed．

Fig・4・13 SteeringWheelinNeutral（enginenotrunning） −123−

4．STEERING SYSTEM

（2）Steeringwheelinneutral（enginerunning）

① Thepressureoilfromthemainpumpflows，paSSingthroughthepriorityvalvePport，CFport

theorbitrol．Theoilthenflows，PaSSlngthroughtheinternalthrottleCoandTport，backintoth

tank．

② Atthistime，thepressuredifferentialproducedacross・theinternalthrottleCooftheorbitroli

transmittedtoboththepressurechambers（A）and（B）sothatthespool（1）movestotherightin ngure．

③ Therefore，thepriorityvalve，EFportisfullyclosedwhiletheCFportisslightlyopened．Thisle almostallportionoftheoildischargedfromthemainpumpflowtothecontroIvalveforoperatlng

theloadhandlingsystem．

Fig・4・14 SteeringWheelinNeutral（enginerunning）

ー124−

4．STEERING SYSTEM

（3）Steeringwheelinrotation

① whenthesteeringwheelisturnedfromtheneutralposition，theoilpassagesintheorbitrolare ChangedoversothattheoilwhichhasenteredthroughPportpassesthroughtheinternalthrottle Cl．

② Atthistime，SincethepressuredifferentialacrosstheinternalthrottleClistransmittedtoboththe PreSSureChambers（A）and（B）ofthepriorityvalve，thespool（1）movestoapositionwhichbalances thepressuredifferentialbetweenthepressurechambers（A）and（B）withthetensionofthecontroI SPring（2），tOdeterminetheratiooftheflowofoildischargedfromthemainpumptotheCFport

andtheflowofoiltotheEFport．

③ TheopeningoftheinternalthrottleClisdeterminedbytherotatingspeedofsteeringwheel・Tha is，thequickerthesteerlngWheelisturned，thelargertheopenlngbecomes；theslowerthesteerlng Wheelisturned，thesmallertheopenlngreSults・Therefore，WhenthesteerlngWheelisturnedquickly， moreoilisdirectedtotheCFport，thusquickeningsteerlngSPeed・

Fig．4．15 SteerlngWheelinRotation −125−

4．STEERJNG SYSTEM

（4）Steeringcylinderatstrokeend

① whenthesteeringwheelisturnedfurtherandthesteeringcylinderreachesitsstrokeend，theoilno longerflowsacrosstheinternalthrottleCl，SOthatthepressuredifferentialdisappears．

② Thepressureinthepressurechamber（B）ofthepriorityvalverisesasthecircuitpressureincreas Thereliefvalve（3）isthenactivatedtoreducethepressureinthepressurechamber（B）．

③ Thepressureinboththepressurechambers（A）and（B）iscontrolledbythethrottleC2tOm

SPOOl（1）totherightinthefigure，thusclosingtheCFportwhilemakingtheEFportalmost Open・

Fig．4．16 SteerlngCylinderatStrokeEnd

ー126−

4．STEER［NG SYSTEM

4・6CUSH10NVALVE（L16−20nly） WhensteerlngOPerationisstartedorstopped，thereoccursarapidriseofoilpressureinthesteerlng

Cylindercircuit・ThecushionvalvehelpsalleviatethesteerlngOPerationoftheloaderbytemporarily escaplngthisrapidoilpressureriseatthelow−PreSSurearea・

13

6

Sectionalview B−B

7 8 9く司

SectionalviewA−A

Note：B＞6：：＝：＝］58・8N−m†6kgf−m）［43．41bf−ft］ 臣＞ぢ：：：：：コ137N−m（14kgf−m）【1011bfTft］

（Circuitdiagram）

1．VALVESEAT 2．HOUSING 3．POPPET 4．SPRING

6．PLUG

11．SPRING

7．SPOOL 8．SPRING

12．PLUG 13．PLUG

9．PLUG lO．POPPET

5．ORIFICE（1．6mm［0．063in．］dia．）

Fig．4．17 CushionValve −127−

4．STEERING SYSTEM

Operation

①Thehigh−PreSureOilwhichflowsrapidlythroughtheRportopensthepoppet（1）agai SPring（2）tenslOn．

② Thehigh−PreSSureOilflows，PaSSingthroughthepoppet（l），thecentergrooveinthespool（3） thecheckvalve（4）attheLportside，tOtheLport． Note：Thecheckvalve（5）attheRportisclosedbythehighpressureoilattheRport．

③Atthesametime，thehigh−PreSSureOilattheRportflowsthroughtheorince（6）intothepr

Chamberoftheplug（7）tomovethespool（3）totheleftagainstthepressureattheLportandsprln （8）tension．

Therefore，thehigh−PreSSureOilattheRportcutsofftheflowofoilwhichpassesthrought POPPet（l）andgetsoutoftheLport．

④ suchatemporaryflowofoilprovidesahydrauliccushion． Afterthat，thisvalvedoesnotoperate，thusglVlngnOeffectonusualsteerlngOPeration．

⑤ Foragradualriseofoilpressurewhichdoesnotneedacushioningeffect，thespool（3）clo earlierthanthepoppet（1）openssothatunnecessaryhydrauliccushionisnotproduced・

3

2

1

L PORT

R PORT

4

5

R PORT

L PORT

Fig．4．18 0peration −128−

4．STEERING SYSTEM

4．7 STEERING CYLINDER

Twodouble−aCtlngSteerlngCylindersareused・Eachpistonrodandcylindertubeareconnected

thefrontframeandrearframe，reSPeCtively・TheloaderissteeredbythepIStOnrOdextendingand retraCtlng・

3 4

8 9

l

﹂

⁝

Detai10finside

14

l ＋】

17く司

Note：B＞ぢ：＝コ304N−m（31kgf−m）［224．21bf−ft］，血Threadedarea‥ThreeBond＃1901 B＞ぢ：：：：：コ392N−m（40kgf−m）［289．11bf−ft］ B＞ぢ：：：：コ6・9N−m（0．7kgf−m）［5．091bf−ft］（Aftertightening，Calktwoparts．） 駐＞Pressurecheckport（PTl／8）

l．CYLINDERHEAD

7． U −RING

2． 0 −RING

8．PISTONROD

13．SETSCREW 14．STEELBALL

3．BACK−UPRING

9．CYLINDERTUBE lO．SLIDERING

15．SPHERICALBEARING 16．SNAPRING

4． 0 −RING

5．WIPERRING 6．BUSHING

11．SEALRING，

0

−RING

12．PISTON Fig．4．19 SteerlngCylinder −129−

17．PLUG

4．STEERING SYSTEM

N OTE

ー130−

5．FRAME AND COCKPIT

5．FRAMEANDCOCKPIT 5．1FRAME Theframeisasteel−Plateweldedtypeanddividedintotwoparts：frontandrearframes・Thecockpit andoperator

sseataremountedontherearframe．

ADonottrytomodifytheROPS（Roll−OVerPrOteCtionstructure），ifmounted，withoutpO PermissionfromthemanufacturerlIftheROPSshouldgetdamagedordefbrmedduetoturnlng

OVerOrCOllision）itisadvisabletoreplaceitwithanewone〉becauseadamagedordeformed ROPShasalowstructuralstrength・

−131−

5．FRAME AND COCKPIT

﹁11一

＋ ＋

し」…

1．REARFRAME Note：圧＞6：：：：：コL13T2‥665N−m（68kgf−m）［490・51bf−ft］

2．BALANCEWEIGHT

L16−2：980N−m（100kgf−m）［722．81bf−ft］ L13−2：613kg［13501bs］ L16−2：977kg［21501bs］

Fig．5．1BalanceWeight

ー132−

5．FRAME ANDCOCKPIT

5．2 CENTER HINGE PtN Theloaderisaframe−articulatedtype：thefrontframelSJOinedtotherearframewithtwohingeplnS

aroundwhichtheloaderpIVOtSforsteerlng．

Awhenloaderissteered，theareanearthecenter hingepinsbecomessonarrowthatyoumightget Caughtbetweenthefrontandrearframes．Before tryingtoservicetheloader，makesuretosetthe Safetylink．Priortomoving（traveling）theloader；

makesurethesafetylinkissettotheorlglnal POSition．

Fig．5．2

−133−

5．FRAME AND COCKPIT

Upper hin e section

DetailofareaA

Lowerhingesection

Note：B＞〆＝＝恥Innersurface：Grease（beforeinstallingpin） 臣＞6：：：：コ34・3±2・9N−m（3・5±0・3kgf一叫［25・3±2・141bf−珂

匪＞6：：：：：コ548・8±39・2N−m（56・0±4・Okgf−m）［404・8±28・91bf一明

R＞疋＝ゝThreadedarea：LOCTITE＃262 1．UPPERHINGEPIN 2．BUSHING 3．BUSHING 4．GREASEFITTING 5．LOWERHINGEPIN

6．COLLAR 7．SHIM 8．FLANGE 9．U−NUT

lO．DUSTSEAL Fig．5．3 CenterHingePin（L13−2） −134−

11．CAP 12．BUSHING 13．COLLAR 14．RUBBER

5．FRAME AND COCKPIT

Detai10fareaA

Lower hin

e section

Note：B＞l⊂＝：恥Innersurface：Grease（beforeinstallingpin）

臣＞ぢ＝：：コ62・6±3・8N−mi6．4±0．4kgトm）［46．17±2．891bf刊 B＞ぢ＝＝コ548・8±39・2N−m（56．0±4．Okgf−m）［404．8±28．91bf−ft］ B＞14＝ゝThreadedarea：LOCTITE＃262 1．UPPERHINGEPIN

6．COLLAR

11．CAP

2．BUSHING

7．SHIM

12．BUSHING

3．BUSHING 4．GREASEFITTING 5．LOWERHINGEPIN

8．FLANGE

13．COLLAR 14．RUBBER

9．U−NUT

lO．DUSTSEAL Fig・5・4 CenterHingePin（L16L2） −135−

5．FRAME AND COCKPIT

N OTE

一136−

6．HYDRAUuC SYSTEM

6．HYDRAULJCSYSTEM Thehydraulicsystemusesthemainpumpasitspowersourceandchangesoveroilflowswiththe COntrOIvalveaccordingtotheworkyouwanttodo． Thehydraulicsystemconsistsofamainpump，COntrOIvalve，ValvecontroIs，Oiltank，andhydraulic plplng・

6．101LCIRCULAT10N ROUTES

Thehydrauliccircuitoftheloaderconsistsofthemainhydrauliccircuit，Steerlnghydrauliccircuit，

andHSThydrauliccircuit． Forthesteeringhydrauliccircuit，reftrto FortheHSThydrauliccircuit，referto

4．STEERINGSYSTEM

（4・2）・

2．1HSTUNIT．

Main hydraulic circuit Theoilpickedupfromtheoiltankbythemainpumpisdirectedtothepr10rltyValvewhereitis

dividedintotwoportions：Oneforthemainhydrauliccircuitandtheotherforthesteerlnghydraulic

Circuit・TheoildividedforthemainhydrauliccircuitisroutedintothecontroIvalve・WhenthecontroI

Valveisinneutral，theoilpassesthroughthecontroIvalvebacktotheoiltank・ Whentheloadhandlinglever（COntrOllever）isoperatedandthecontroIvalvespoolmoves，theo

flowsthroughtheoilpassagechoseninsidethevalvetothecylinder・Theoildischargedfromthecylinder returns，PaSSlngthroughthecontroIvalve，intotheoiltank・ Theoiltankhas areturnfilterinsideit．

ー137−

6．HYDRAUuCSYSTEM

bq．m

REロ。W10：

Ll陀8朋 しt●．〜：l珊

卸＝

q泊．：0．6l

（OmN〉

【＿＿＿＿l

追

￣￣￣ l l

；霞済； …】 二」

l

i

−▲−・−−・一−−・−−・▼■−−■￣■■￣−【￣￣￣￣■￣ ￣￣■■■−■￣一￣￣￣￣￣￣■−￣￣−￣￣￣￣￣−■■【￣￣￣●￣￣ V購 1

1

1

1

1

L DRA【NPORT l 闘

蒜，i開脚YM

I

、

・、・

空警三1 I

甜鵜認諾賊）

l

I

l

FNRSα一脈【FIh呼叫

l

l

lR（一別〉：可

l

iNote：Thiscircuitdiagramcontains

l

柵＿」 「￣￣￣【￣【■

￣▼

1

1

l

thebrakhy血auljccircuit，

義 一 l

‡し1㌻2：朋＿3抑押．0118吋り t L18茂：如・ヰmt（〉・0158bl

1

l

r﹂

︻●−■1−■﹂■■1−■●︼一−●t一−●−

﹁■章LL

l

1

一 都藁≡〒「 ミ？し −㌔■：i、

Steennghydrauliccircuit，

尺山叫 と】諾縄駄

H＄TMOTOR（UCH恥▲叫

M▲】仙STEERjNGW L13・2，56，l∝加帥 し18−2′60月血

andHSThydrauliccirc山t・

｝丁目ROW（；掴pUMP（5Hi付入DZU〉

Llユ・2二幻．5一組．3如l℃V Ll陀こ‡88−114？【Xゾ化Ⅳ

T心細QNG伯MEPUMP ll血

﹁．．．

＝ 力＝

照射

HSTしOAD∈RJST∈∈Rl鵬 RETURNr軋TER

￣￣￣￣−￣−￣￣￣￣￣￣￣

OP∈MNGCHARG∈

二∫ニニニ 泣，〜子J ㍍

トISTDR▲」NしW一己MP 8YP人SSCHECく∨札V亡

．

霊

…−−−−一斗ヒニニニニニニニニニニニニニニニ＝二三二柵＿…＿＿＿＿…＿＿▼＿」し＿…＿

￣

l

F】

【 t t t l

】

御ME≡iH（1TTl」）

−◇−

＿ご」

l叫 …豊￡㌫，川2．9鳩弼

し血叫

1

殖IbrLl＆2 日左8m（X始

l￣￣￣￣￣

コ

PR∈S8、T†1ROTTLg

l

L−・−・−・−−一一−−・・トー■−−・▼−1−

−￣−▼￣￣￣￣￣− 【 【 ▼￣ 【

￣

＿＿＿＿＿＿▼．＿＿＿＿＿l

Fig．6．1HydraulicCircuitDiagram −138一

l

6．HYDRAULIC SYSTEM

6．2 PUMP L13＿2

Ll ＿2

Main pump Model

56・20・11R532

Type

Geartype

←

Drive

（installedonHSTpump）

←

Discharge

112L［29．59USgal］／min

141L［37．25USgal］／min

60・20・11R612

1・47MPa（15kgf／cm2）［213．2psi］ 1・47MPa（15kgf／cm2）［213．2psi］ Ⅵねight

2300rpm

2450rpm

19．5kg［42．991bs］

20．8kg【45．861bs］

（includingHSTchargingpump （includingHSTchargingpump Steering pump

andT／Mchargingpump） Usedincommonwithmainpump

andT／Mchargingpump） ←

HSTcharglngPumP

Type

Geartype

←

Drive

Connectedtotherearofmainpump

←

Discharge

44L［11．62USgal］／min

47L［12．42USgal］／min

3・9MPa（40kgf／cm2）【565．6psi］ 3・9MPa（40kgf／cm2）［565．6psi］ 2300 rpm

2450 rpm

Geartype

←

Transmissioncha唱ingpump （Brakeassist） r吋pe

Drive

Connectedtotherearof

←

HSTcharglngPumP Discharge

24L［6．34USgal］／min

26L［6・87USgal］／min

1・77MPa†18kgf／cm2）［256．7psi］ 1・77MPa（18kgf／cm2）［256．7psi］

2300rpm

−139−

2450rpm

6．HYDRAULIC SYSTEM

Theloaderusesthreepumps：mainpump（Steeringpump），HSTchargingpumpandtransmissio Chargingpump（brakeassist）．

TheHSTpumpunithastriplepumpsatitsrearside：ThefirstpumpISuSedasthemainpump，

SeCOndpumpastheHSTcharglngPumPandthethirdpumpasthetransmissioncharglngPumP・ SincethedrivegearofthetriplepumpsiscoupledtotheHSTpumpunitdriveshaft，italwaysrotates

astheenglnerunS．

（HSTPUMP）

l

﹇起腔け

」‖＿＿−−＿＿

Note：B＞ぢ＝コ91・2±18N−m（9・3±1・8kgf−m）［67・27±13・281bf−ft］

Fig．6．2 Pumps

−140−

6．HYDRAULIC SYSTEM

DISCHARGE SrDE

SUCT［ON SIDE

DIRECTlON OF ROTATION

＿．ご−−＝己ゝ．

1．MAIN／STEERINGPUMP 1

2．HSTCHARGINGPUMP 3．TRANSMISSIONCHARGING／BRAKEPUMP

」−−

Fig・6．3 TriplePumps −141−

6．HYDRAULIC SYSTEM

17

1．DRIVEGEAR 2．OILSEAL 3．BODY

8．COUPLING

15．REARCOVER

9．ADAPTERPLArE

16．FRONTCOVER

4．SIDEPLATE

lO．ADAPTER ll．0ILSEAL

17．DRIVENGEAR 18．DRIVENGEAR

5．ADAPTERPLATE

12．BODY

19．DRIVENGEAR

6．BODY 7．DRIVEGEAR

13．DRIVEGEAR 14．SIDEPLATE

Fig．6．4 StructureofTriplePumps

−142−

6．HYDRAULIC SYSTEM

6．3 CONTROLVALVE Model

KVS−120H−2

Type

Parallelcircuit，2−SpOOIslidingtypewithreliefvalve

Mainreliefpressuresettlng

20・6MPa（210kgf／cm2）［2988psi］

Portreliefpressuresettlng

11・8MPa†120kgf／cm2）［1711psi］

（atbucketcylinderrodside） Ⅵ屯ight

21kg［46．31bs］

6．3．1GENERALDESCRIPT10N ThecontroIvalveisastacked，2−SPOOIslidingtype，COnSistlngOftheinletsection，tWOSPOOIsections，

andoutletsection． Note：ForthecontroIvalveinstallation，SeeFig・6・21・ （1）RelierValve

ThecontroIvalveisprovidedwithareliefvalvethatservestoprotectthe entirehydrauliccircuitof

theloadhandlingsystemwhilecontrollingtheoperationpressure・Thecylinderportleadingtoth bucketcylinderrodsideishttedwithaportreliefvalvewhichrelievesthepressureoilwhenthecylinder receivesaloadheavyenoughtoletthepressureatthecylinderportrisebeyondthespecinedvalue，thus PrOteCtlngthecylinderandthepiplng．

（2）Detentmechanism

① Theboomspoolhasamechanicaldetentatthepositionwhereitisfu11ypulledout（boomfloating Stage）．

② Thebucketspoolhasanelectromagneticdetentatthepositionwhereisfullypushedin（bucket roll−backstage）・Thedetentscomposethebucketleveleranddonotfunctionwhenthebucketisin therangefromleveltoroll−backposition・

ー143−

6．HYDRAULIC SYSTEM

Para（lelcircuit

Note：B＞（芯＝コ（2points）64・7N−m （6．6kgf−m）［47．71bf一円

臣＞ぢ＝＝コ101N−m（10・3kgf−m） ［74．491bf−氏］

＝D．C．24V

1．MAINRELIEFVALVE 2．INLETSECTION 3．PORTRELIEFVALVE 4．SPOOLSECTION（BUCKET）

5．OUTLETSECTION 6．SPOOLSECTION（BOOM）

Fig．6．5 ControIValve

−144−

6．HYDRAULIC SYSTEM

（Bucket）

1 2 3

1．SPOOL 2．WIPER 3．SEAL 4．VALVEHOUSING

10 11 4

5 6

7

8

9

5．CAP

9．COILTUBEASSEMBLY

6．SPRING

lO．CHECKVALVESPRING ll．CHECKVALVEPOPPET

7．PIN 8．PLATE

（Boom）

1．SPOOL 2．WIPER 3．SEAL 4．VALVEHOUSING 5．SPRING

6．DETENTPIN

11．DETENTSPACER

7．DETENTSPRING 8．CAP

12．SHIM（t＝0．5mm［0．02in．］）

13．CHECKVAINESPRING 14．CHECKVALVEPOPPET

9．DETENTSLEEVE lO．STEELBALL

Fig・6．6 SpooISection −145−

6．HYDRAULIC SYSTEM

6．3．2 0PERAT10N

Whenthecontrolleverisactuated，theoilpassagesareswitchedoverbythespooIsslidingsothatthe

PreSSureOilfromtheprlOrltyValveisselectivelysenttothebucketorboomcylinder・ Theboom，s＝float＝positionandthebucket，s thecontrolleverisplacedinthe㍑floatMor

roll−backHpositionhaveadetentmechanism・Wh

roll−back＝，thedetentmechanismkeepstheleverposi

thatthespooldoesnotreturntoneutralifyourhandisremovedfromthelever・Thecontro1

automaticallyreturnstoneutralfromoperatlngPOSitionsthan float and roll−back whenyour is removedfromthelever．

1．ControIvalveinneutral

① whenthespooIsofthebucketspooIsectionandtheboomspooIsectionareinneutral，boththe CylinderportsA（rodside）andB（tailside）areclosedbythespool・

② ThepressureoilwhichhasreachedthecontroIvalveflowsthroughtheinletsection，PaSttheneutra OilpassagesinthebucketspooIsectionandtheboomspooIsection，tOtheoutletsectionfrom Whichitisdirectedtothelow−PreSSureOilpassageandleavesthecontroIvalvethroughtheinlet SeCtlOn．

Note：ThesketchshowsatypICalKVSseriesvalve・Theactualvalveusedforyourloaderma Slightlydifferentshape．

Fig．6．7 ControIValveinNeutral（BucketSpooISection）

−146−

6．HYDRAULIC SYSTEM

2・Bucketspooloperation （1）Roll・back

①whenthecontrolleverisplacedinthe

roll−back

position，thebucketspoolmovesinthedirection

indicatedbythearrow．

②Theneutraloilpassageisclosedbythespoolandthepressureoilpushesopentheloadcheckvalve toflowtothecylinderport（Bl）fromwhichitisdirectedintothebucketcylindertail．

③Theoildischargedfromthebucketcylinderrodsideflowsthroughthecylinderport（Al）tothe low−PreSSureOilpassageandbacktotheoiltank．

Fig．6．8 BucketinRoll−back

（2）Dump

①whenthecontrolleverisplacedinthe

dump

position，thebucketspoolmovesinthedirection

indicatedbythearrow．

②Theneutraloilpassageisclosedbythespoolandthepressureoilpushesopentheloadcheckvalve toflowtothecylinderport（Al）fromwhichitisdirectedintothebucketcylinderrodside．

③Theoildischargedfromthebucketcylindertailsideflowsthroughthecylinderport（Bl）tothe low−PreSSureOilpassage・

Fig・6・9 BucketinDump −147−

6．HYDRAULIC SYSTEM

3．Boomspooloperation （1）Raiseanddown

TheoilpassageintheboomspooIsectionisidenticalwiththatofthebucketspooIsection・Therefore

boomraislngOPerationisidenticalwithbucketroll−backoperationwhereasboomlowerlngOPerationis

identicalwithbucketdumpoperation．Forthedetailsofboomoperation，Seethepertinentsec

bucketoperation． （2）Float

① whenthecontrolleverisfurtherpusheddownfromthe Down positiontothe Float position， theboomspoolmovesasindicatedintheillustration・

② Duetothismotiontheneutralpassageisopened．Thepressureoilflowsasinneutralpositio ③Thecylinderports（A2）and（B2）areconnectedtothelowpreureOilpassage・Asaresult， boomsfloatoverthegroundsurfaceaccordingtoitsirregularltleS・Theoildischargedfro boomcylinderrodsideissenttothetailsideandtheoilforcedoutfromitstailsideissenttothe

rodsiderespectivelythroughthelowpressureoilpassageinthecontroIvalve・

Fig．6．10 BoominFloatlng

ー148−

6．HYDRAULIC SYSTEM

4．Detentoperation （1）Boomside

① whenthecontrolleverispusheddownfullyto the

Float

position，theboomspool（1）ispu11ed

Outfu11y．Duetothis，thedetentpin（2）fittedto

thespoolendisalsopulledout，andthedetent balls（3）fallintothegrooveofdetentsleeve（4）．

② sincethedetentballsarepushedbythedetent SPring（5），theboomspoolholdsitsposition，and

thedetentbecomesoperative．

③ Toreleasethedetent，Pullthecontrolleverto disengagethedetentba11・

Fig．6．11BoomSideDetentinOperation

（2）BucketSide

① Theelectromagneticdetentisusedatthebucketside．Theelectricalcircuitisconnectedfromthe batterytotheproximltySWitchofthebucketlevelerthroughthecoilassemblyofthebucketspooI SeCtlOn．

② whenthebucketistiltedforward，theproximityswitchiskep．tclosedsothatthecoilassembly（4） isexcited．

③ whenthecontrolleverispulledoutfullytothe Roll−back position，thebucketspool（1）isfu11y

pushedin，andthepin（2）fittedtothespoolendisalsopushedin，SOthattheplate（3）contactsthe coil（4）．Asaresultthebucketspoolholdsitsposition，andthedetentbecomesoperative・

④ Toreleasethedetent，OPentheproximityswitchtode−energizethecoilassemblyoroperatethe COntrOlleverbyhand．

1

2

3

Fig．6．12 BucketSideDetentinOperation

−149−

6．HYDRAULIC SYSTEM

6．3．3 REuEFVALVE

l．Mainreliervalve Themainreliefvalveislocatedbetweentheneutraloilpassageandthelow−PreSSureOilpassage （returnoilpassage）intheinletsection．

Operation （1）Ininoperativestate Thepressureoilinthehigh−PreSSureOilpassage

（HP）flowsthroughthethrottlehole（2）inthemain POPPet（l）tofilltheinternalcavity（3）．

Owing to the differencein area on whichthe hydraulicpressureacts，themainpoppet（1）closely SeatStOthesleeve（4）．

Fig．6．13InInoperativeState （2）Operation（A）

Whenthepressureinthehigh−PreSSureOilpassage （HP）risesandexceedsthereliefpressuresetting，the Pilotpoppet（5）opens． Thepressureoilflowsfromthepilotpoppetinto thelow pressure oilpassage（LP），afterpassing betweenthesleeve（4）andthehousing（6）．

Fig．6．14 0peration（A） （3）Operation（B） Asthepilotpoppet（5）opens，thepressureinthe

internalcavity（3）lowerstoopenthemainpoppet（1）

SOthatthepressureoilintheoilpassage（HP）flows directlyintothelowerpressureoilpassage（LP）．

Fig．6．15 0peration（B）

ー150−

6．HYDRAULIC SYSTEM

2．Portreliefvalve Theportreliefvalveislocatedbetweentherod−SidecylinderportofthebucketspooIsectionand low−PreSSureOilpassage（returnoilpassage）．

Thecombinationvalveusedfortheportreliefvalveprovidesanti−CaVityfunctionaswellasrelief Valvefunction．

Operation （1）Ininoperativestate

Thepressureoilatthecylinderport（HP）flows throughtheholeinthepistonpoppet（1）toactonboth thecheckvalvepoppet（2）andthereliefvalvepoppet （3）toseatcloselyduetothedifftrenceinareaonwhich Oilpressureacts．

Fig．6．16InInoperativeState （2）Operation（A）

Whenthepressureatthecylinderport（HP）rises andexceedsthereliefpressuresettlng，thepilotpoppet （4）opens．

Thepressureoilflows，PaSSingthroughthepilot poppet，theareabetweenthecheckvalvepoppet（2） andhousing（5），intothelow−PreSSureOilpassage（LP）．

Fig．6．17 0peration（A） （3）Operation（B） Asthepilotpoppet（4）opens，thepressureatthe

backofthepistonpoppet（1）dropssothatthepiston POPPetmOVeS・

Theholeinthepistonpoppet（1）isclosedbythe Pilotpoppet（4）andthusthepressureatthebackof thereliefvalvepoppet（3）dropsfurther．

Fig．6．18 0peration（B）

−151−

6．HYDRAULIC SYSTEM

（4）Operation（C）

Apressuredifferentialisproducedacrosstherelief

Valvepoppet（3）tomovethereliefvalvepoppet・ Therefore，thepressureoilatthecylinderport（HP）

flowsdirectlyintothelow−PreSSureOilpassage・

Fig．6．19 0peration（C） （5）Suction

Ifthepressureatthecylinderport（HP）islower

LP

2

thanthepressureatthelow−PreSSureOilpassagedue

totheoccurrenceofcavitation，thecheckvalvepoppet movesduetothedifferenceinareaonwhichnegative PreSSureaCtSaCrOSSthecheckvalvepoppet（2）・

Therefore，Oilisdeliveredfromthelow−PreSSure

Oilpassagetothecylinderport（HP）toremovethe CaVltatlOn．

Fig．6．20 Suction

−152−

6．HYDRAULIC SYSTEM

6．4 VALVECONTROLS

ThevalvecontroIsystemisasinglelevertype・WhenthecontrolleverismanlPulated，thecontro

ValvespooIsareoperatedbythecables；ShiftingtheleverbackandforthwillactuatetheboomspooI

Whileshiftingtheleversidewayswi11actuatethebucketspool・

AAsasafbtydevicefbrthevalvecontroIsystem，aStOPPerlinkisprovided．Usethestopperl

tolockthecontroIvalveinneutralwhentheloadhandlingsystemdoesnotneedtobeused・

−153−

6．HYDRAULIC SYSTEM

Note：B＞紹＝ゝThreadedarea：LOCTITE＃262 B＞r⊂＝恥Beforeassembly，aPPlygrease．

1．KNOB

8．CONTROLLEVER

15．SPRING

2．BOOT 3．COVER

9．BUSHING lO．PIN

16．HANDLE（LEVERSTOPPER）

4．CONTROLBOX 5．PLATE

ll．BUSHING

18．CABLE（FORBUCKET） 19．CABLE（FORBOOM）

6．CONTROLVALVE 7．BRACKET

17．BALLLINK

12．BOSS 13．BRACKET 14．STOPPERLINK

Fig．6．21ValveControIs −154−

6．HYDRAUuC SYSTEM

6．5 01LTANK 「吋pe

Pressurized−CIosedtype

Tank capacity

50L【13．2USgal】

AirbreatheroperatlngPreSSure

Positivepressure‥ 46−54kPa（0・47−0．55kgf／cm2） 【6．67−7．83psi］ Negativepressure：4−5kPa†0．04−0．05kgf／cm2） ［0・580−0．725psi］

Returnfilter

1pc．（10いm）

Theoiltankholdshydraulicoilusedforthemainhydrauliccircuitandthesteerlnghydrauliccircuit・ Itisboltedtotherearframe． Theoiltankhasareturnfilterinsideit．

1．RETURNFILTER 2．BREATHER 3．0ILTANK 4．OILDIPSTICK 5．SUCTIONFILTER／ 6．（REARFRAME）

Note：D＞ぢ＝コ12・7N−mil・3kgf−m）［9・371bf−ft］，疋⊃ゝThreadedarea：LOCTITE＃262 Fig．6．22 0ilTank −155−

6．HYDRAULIC SYSTEM

N OTE

−156−

7．LOAD HANDLING SYSTEM

7．LOADHANDLINGSYSTEM Theloadhandlingsystemisoperatedbyhydrauliccylindersandisusedfordigglng，loadingand unloading，andtransportlngloads・

ThelinkageemployedfortheloadingsystemisaninverseZ−Shapetypewhichissimplerindesign

andproducesmorepowerfulbucketbreak−Outforcethantheduplextypeandothers・

Fig・7・1LoadHandlingSystem

−157−

7．LOAD HANDLING SYSTEM

7．1BOOM，BELLCRANK，ANDBUCKET L13＿2 Linkage Bucket Bucketcapaclty，・heaped

Bucketleveler Boom kickout Weight Boom Bellcrank Pushrod

乙shape

←

DEB，Itype

←

1．3m5［1．7y3］

1．6m3［2．1y3］

Provided（non−COntaCttyPe）

←

Not provided

←

462kg［10191bs】

575kg［12681bs］ 110kg【242．51bs］

83kg［1831bs］ 21kg［46．31bs］

Bucket（W／doubleedge）

Ll ．2

535kg［11791bs］

31kg［68．31bs］ 710kg【15651bs］

7．1．1GENERAL DESCRIPT10N

Theloadhandlingsystemconsistsofbooms，bellcrank，PuShrod，bucket，bucketcyl

Cylinders，andpinsusedforsecurlngthosecomponents・Thebucketlevelerhelpsprovideemci

handlingoperation・AllconnectingplnSOftheloadhandlingsystemhavedustsealstopreventt

entranceofwater，mud，Ordustintothesystem．Inaddition，the3connectlngPlnSforthebuc PrOVidedwith 0

−rlngS．

AllconnectlngPlnSareSeCuredwithlockbolts．

（Fig．7．2Partnames）

1．BUCKETCYLINDER 2．BELLCRANK 3．PUSHROD 4．BOOM 5．BUCKET

6．FRONTFRAME

11．BUSHING

7．SPACER

12．DUSTSEAL

8．BOOMCYLINDER 9．PIN lO．GREASEFITTING

13． 0 −RING

ー158−

14．LOCKBOIJ

7．LOAD HANDLING SYSTEM

3、

痢

／

ヽこ：＼＼、＼＼

ガ′

＼・・−

くこ、こ＼

Structureofpin（t

（Bucketpins）

Note：D＞l⊂＝：恥Allpins，bushingsandbosses：Grease（applybeforeinstallingpins） 匡＞Dustsealsmustbeinstalledwithlipfacingoutward．

Fig．7．2 Boom，Bellcrank，andBucket（1） −159−

7．LOAD HANDLING SYSTEM

Installingbucketstoppers

A

L13＿2 54mm［2．13in．］ L16＿2 58mm【2．28in．］

B

C

L13＿2

26mm［1．02in．］

460mm［18．11in．】

L16−2

38mm［1．50in．］

495mm［19．49in．】

Note：Extendthebucketcylindertothefull，retraCtit3mm［0．12in．］beforeweldingthestopper．

Installingbucketpins ■．1．L

−．1．﹂

﹁ ．︼．■．1．

﹁．1．−．1．

① set

0

−ringsbetweenthebucketandbooms

（2points）andbetweenthebucketandpushrod beforeinstallingthebucket，boomsandpush

﹂ ﹁．

一 L

rod．

② Afterinstallingthebucket，boomsandpushrod， applygreaseonthewholeperipheryoftheareas markedwith※andinstallthe grOOVeS・

Fig．7．3 Boom，Bellcrank，andBucket（2） −160−

0

−ringsinthe

7．LOAD HANDLING SYSTEM

7．1．2 BUCKET thedouble−edgedbucketisstandard・Inadditiontothestandardtype，tyPellightbucketandtype3 bucketarealsooptlOnallyavailable・

Thebucketshouldbeselectedwithduecare，COnSideringtheconditionofjobsites，thenatureo

loadstobehandled・andtheoperatlngCOndition・Awrongbucketwillcauseaninefficientoperationand

maycausethemalfunctionoftheloadhandlingsystemaswell・ （Double・edgedbucket：I）EB）

Note：臣＞ぢ＝コ1070N−m（109kgf−m）［789．21bf一明

Fig．7．4 Bucket

−161−

7．LOAD HANDLING SYSTEM

7．1．3 BUCKET LEVELER WhenthecontrolleverisputintheHroll−back

positionafterdumplngthebucket，thebucketlevel

automaticallyreturnsthecontrollevertoneutralwhenthebucketbecomeslevel，keeplngthebucket level．

Operation ① Asthecylinderrodofthebucketcylinderisextendedandthebucketisrolledback，thelevel leavesthesenslngSurfaceoftheproximltySWitch，SOthattheelectriccircuitisopened・

② TheproximityswitchisconnectedtothesolenoiddetentcoilofthecontroIvalvebucketsect Thesolenoiddetentisthusreleasedtoletthecontrolleverreturntoneutral，StOPPlngtherolling backoperationofthebucket．

Note：Thebucketroll−backphaseofthecontroIvalveusesasolenoiddetentmechanism・Whent bucketisrolledbackbeyondthehorizontalline，nOfurtherelectricltyWillflowtothesolenoid detentcoilsothatthedetentmechanismwon

twork．

1．BUCKETCYLINDER 2．LEVELERBAR 3．BRACKET 4．PROXIMITYSWITCH 5．CONTROLVALVE 6．WIRING 7．BRACKET Fig．7．5 BucketLeveler

ー162−

7，LOAD HANDuNG SYSTEM

7・1・4BOOMKICKOUT（OPTION） Theboomkickoutdevicestopstheboomsatapresetheightduringtheliftingphase・Withthecontr leverintheboomraiseposition，theboomkickoutdeviceautomaticallyreturnsthecontrolleverin neutralwhentheboomsareraisedtothatpresetheight，thusstopplngtheliftingoperationofthebooms・

Operation

①whentheboomsareraisedtoチPreSetheight，thelevelplateinstalledononeoftheboomsleaves thesenslngSurfaceoftheproxlmltySWitch，SOthattheelectriccircuitisopened・

② TheproximityswitchiswiredtothesolenoiddetentcoilofthecontroIvalveboomsecti。n．The SOlenoiddetentisthusreleasedtoreturnthecontrollevertoneutral，thusstopplngtheliftingoperation

Ofthebooms． Note：ThecontroIvalveoftrucksequlPPedwithaboomkickoutdeviceisdifferentfromthatofthe Standardloader．

7 8

Note：Theaboveisaroughsketchoftheboomkickoutdevice・Itmightbedifferentfromtheactual boomkickoutdevice． 1．PROXIMITYSWITCH

4．LEVELPLATE

2．BRACKET 3．TAPPEDPLATE

5．WIRING 6．CONTROLVALVE

Fig．7．6 BoomKickoutDevice −163−

7．BOOM 8．FRONTFRAME

7．LOAD HANDLING SYSTEM

7．2 CYLJNDERS L13＿2

Ll ．2

Type

Double−aCtlngPIStOn

←

Q ty

2

←

Innerdiameter

90mm【3．54in．］

110mm［4．33in．］

Cylinder rod diameter Cylinderstroke

55mm［2．17in．］

60mm［2．36in．］

760mm［29．9in．］

681mm［26．8in．】

Weight（PerCylinder）

53kg【1171bs］

75kg【1651bs】

Boom cylinder

Bucket cylinder

Type

Double−aCtlngPIStOn

← ←

Q ty

Innerdiameter

110mm［4．33in．］

130mm［5．12in．］

Cylinder rod diameter

60mm［2．36in．】

70mm［2．76in．］

Cylinderstroke

421mm［16．6in．］

431mm［17．Oin．］

56kg［1231bs］

88kg［1941bs】

Ⅵねight

7．2．1BOOM CYuNDER

Twodouble−aCtlngPIStOntyPeboomcylindersareused．Whentheboomcylindersareextended retracted，theboomsareraisedorlowered，rOCkingaroundtheconnectlngPlnateaChcylindertail． Theboomcylinderconsistsofacylindertube，Cylinderhead，Pistonrod，Pistonandpackings．

7．2．2 BUCKETCYLINDER

Thebucketcylinderisadouble−aCtlngPIStOntyPe．Asthebucketcylinderisextendedorretracted，

thebucketisdumpedorrolledbackthroughthebellcrankandpushrod． Thebucketcylinderconsistsofacylindertube，Cylinderhead，Pistonrod，Pistonandpackings・

ー164−

7．LOAD HANDLING SYSTEM

13・3］

1 5 6 7 1

Detail of inside

し‖…．．‥‖＿＿ ＿＿‥＿

り田りり臣

臣匪匪匪臣

e t O N

530N−m（54kgf−m）［3711bf−ft］，疋＝ゝThreadedarea：ThreeBond＃1901 1320N−m（135kgf−m）［973．61bf−ft］ 16・2N−m（1・65kgf−m）［121bf−ft］（Aftertightening，Calktwoparts．）

58・8N−m（6．Okgf−m）【43．41bf−ft］ 22・1N−m（2．25kgf−m）［16．31bf−ft］

1．CYLINDERHEAD 2． 0 −RING

7．URING 8．PISTONROD

13．SETSCREW 14．STEELBALL

3．BACK−UPRING

9．CYLINDERTUBE

15．PINBUSHING

4． 0 一RING

lO．SLIDERING

5．WIPERRING 6．BUSHING

ll．SEALRING，

16．WIPERRING 17．PIPE

0

−RING

12．PISTON

Fig・7・7 BoomCylinder（L13−2） −165−

7．LOAD HANDLING SYSTEM

10111213く召 14く司

5 6 7 Detai10finside ∈

りりりり臣

臣匪匪匪臣

e t O N

830N−m（85kgf−m）［612．21bf−ft］，超＝ゝThreadedarea：ThreeBond＃1901 2350N−m（240kgf−m）【17331bf−ft］ 31・5N−m（3・21kgf−m）［23・21bf−ft］（Aftertightening，Calktwoparts．）

118N−m（12．Okgf−m）［87．01bf−ft］

39．8N−m（4．06kgf−m）［29．41bf−ft］

1．CYLINDERHEAD 2． 0 −RING 3．BACK−UPRING 4． 0 −RING

5．WIPERRING 6．BUSHING

7．URING 8．PISTONROD 9．CYLINDERTUBE lO．SLIDERING ll．SEALRING，

13．NUT 14．SETSCREW 15．STEELBALL 16．PINBUSHING 0

−RING

12．PISTON

Fig．7．8 BoomCylinder（L16−2） −166−

17．WIPERRING 18．PIPE

7．LOAD HANDLING SYSTEM

Detai10finside

Note：B＞6：＝コ830N−m（85kgf−m）［612．21bf−ft］，疋＝ゝThreadedarea：ThreeBond＃1901

B＞ぢ＝コ2450N−m（250kgf−m）［18071bf−ft］ B＞ぢ＝：：：コ31・5N−m（3．21kgf−m）［23．21bf−ft］（Aftertightening，Calktwoparts．） B＞6：：：：：コ118N−m（12・Okgf−m）［87．01bf−ft］ 匝＝＞Pressurecheckport（PTl／8）

匪＞ぢ＝＝コ39・8N−m（4．06kgf−叫［29．41b柑】

4， 0 −RING

7．URING 8．PISTONROD 9．CYLINDERTUBE lO．SLIDERING

5．WIPERRING 6．BUSHING

12．PISTON

1．CYLINDERHEAD 2． 0 −RING 3．BACK−UPRING

ll．SEALRING，

13．NUT 14．SETSCREW 15．STEELBALL 16．PINBUSHING 0

−RING

Fig・7・9 BucketCylinder（L13−2） −167−

17．WIPERRING 18．PIPE

7．LOAD HANDLING SYSTEM

9 101112く司

￣￣「

ト

■．

Detai10finside

Note：B＞ぢ：：：：：：コ442N−m（45・1kgf−m）［3261bf−ft］

B＞ぢ＝＝コ2890N−m（295kgf−m）［21321bf−ft］ B＞6：＝コ56t9N−m†5・8kgf−m）［42・01bf−ft］（Aftertightening，Calktwoparts・） 匡＞ぢ＝コ118N−m（12・Okgf−m）［87・01bf−ft］ B＞Pressurecheckport（PTl／8）

R＞（芯＝コ39・8N−m（4・06kgf−m）［29・41bf−ft］

1．CYLINDERHEAD

7．PISTONROD

13．SETSCREW

2．BACK−UPRING

8．CYLINDERTUBE

14．STEELBALL

3． 0 −RING

9．SLIDERING

4．WIPERRING

lO．SEALRING，

15．PINBUSHING 16．WIPERRING

5．BUSHING 6．URING

ll．PISTON 12．NUT

0

−RING

Fig．7．10 BucketCylinder（L16T2） −168−

17．PIPE

8．ELECTRIC SYSTEM

8．ELECTRJCSYSTEM 8．1LIGHTJNG UNJT Name

Specifications

Headlights

24V62／62W

Clearancelamps

24 V 12W

Turnsignals（front）

24 V 25W

Remarks

Q ty 2

Halogen

2

Front combination lamp

2

Rearcombinationlamp

Brakelamps Taillamps

24V25／10W

Back−uPlamps

24 V 12W

Turnsignals（rear）

24 V 25W

Licensenumberplatelamp

24V12W

Rear work lights

24 V 40W

2

−169−

8．ELECTRLC SYSTEM

8．2 METERSANDSWITCHES 8．2．10PERATINGSTATUSMOMTORS（CLUSTERMETERUNTT）

Theoperatingstatusmonitorsystemmonitorstheloader soperatingstatuswiththesensors SWitchesinstalledontheloader，displaylngtheinformationontheclustermeterunitintheoperator

COmPartmenttOinformtheoperatorofthecurrentoperatlngStatuSOftheloader・ TheoperatlngStatuSOftheloaderisdisplayedbyacombinationofmetersincludingthespeedometer， monitorlamps（Warninglamps），andindicationlamps・

q ［コ 仁＞

FM ：Fuelmeter

SM ：Speedometer

WTM：Enginewatertemperaturemeter

Ll−L13：Monitorlamps

EHM：Enginehourmeter （Circuitdiagram）

Fig．8．1ClusterMeterUnit（1） −170一

8．ELECTR［C SYSTEM

Connectedto

CONⅣ． No．

15 Charge

口 Turnsignal（R）

2 Hibeam

CNl

Connectedto

CONⅣ． No．

CNl

16 Glowplug

3 Turnsignal（L）

17 Parkingbrake

4 Watertemp．sensor

18 Worklight

5 Engineoilpressure

19 Instrumentlamp

6 ‖

20 Power

power

7 N．C

21 （Emergencysteering）

8 Fue11evelsensor

CN2

22 N．C

9

23 Higear

10

24 CNト3

●CN3

25 OPT−1

N．C

12 N．C

26 Brakeoillevel

13 Ground

27 HourmeterGND

CN3

14 CNト3

28 Hourmeterpowersupply

Fig．8．2 ClusterMeterUnit（2）

1．Meters

EnglneWatertemp．meter

Meter

Fuellevel meterr

670C

E F

F一

誓撃

Scale

団

Q息

Measurementpolnt 670C［1530F］〆 Standardresistance

Sensorname Fuel level sender unit

Thermosenderunit

49．8n

1020C［2160F］〆

E〆

F〆

16．8n

80n

10亡2

Location

Specifications

Application Fuel level

Floatposition

E

l／2

F

meter

Resistancef2

80

32

10

Engine water

Tbmp．0C［OF］ 50［122］ 80［176］ 120［248】 Upperfrontofenglne （atcoolingfanside）

temp・meter

80

−171−

32

Insidefueltank

10

8．ELECTRIC SYSTEM

2．Monitorlamps（Warninglamps）

Theloaderisprovidedwiththreewarninglamps（Nos．1，2and7）andfourindicationlamps（Nos・3 4，5，and6）．No．8isusedforanoptionaldevice．

Whenthestarterswitchisturnedon，allmonitorlampsshouldcomeon・Ifanylampwon itissuspectedthatthebulbisblownout・ No．

Name

口 ▲

Engineoilpressure

DescrlPtlOn

LampcomesonwhenenglneOilpressureislowor theoilfilterisclogged．

2 Eヨ Batteryvoltage

Batteryundercharged

3

Brake is applied

《勤 Brakeoilpressure

4 ⑳ 5

ぷ

6 令

Glowplug

Engine being preheated

勒rklight

Theworklightsareturnedon・

Higear

TheloaderisrunnlnginHigear

7 一便効 Brakeムillevel

8 ㊨ Name

Emergencysteer（。Pti。n）

Application

Emergencysteerfunctionisused・

Specification

Location

Turnsonwhenoilpressureis

Oil pressure switch Engine oil PreSSure

Filterclogswitch

Brakeoillevelislow．

below29kPa†0．3kgf／cm2i［4．21psi］

Turnsonwhenpressuredifferentialismore Nearoilfilteratleft thanO．3kPa（0．003kgf／cm2）［0．044psi］ Ofenglne

Pres ureswitch （forparkingbrake） Parkingbrake OF ：0．64MPa（6．5kgf／cm2）［92．8psi］ ON：0．27MPa（2．8kgf／crn2）［39．2psi］ （Turnsonatatmosphericpres ure ．）

Levelswitch

Left of engine

Transmission brake

Cylinder Builtinbrakeoiltank

Brakeoillevel Turnsonwhenlevelislow．

8．2．2 LIGHTING SWITCHANDTURN SIGNALSWITCH Forthelightingswitchandturnslgnalswitch，referto

−172−

Fig．2・11ShiftLever・

tcome

8．ELECTRIC SYSTEM

8．3 LOCAT［ON OFRELAYS

RELAY BOX

RI R2 R3 R4 R5

NEUTRALSTARTRELAY ENGINESTOPMOTORRELAY

PARKINGBRAKERELAY（2）

﹇且甘﹈

LOADDAMPRELAY TRANSMISSIONHi−Lo SOLENOID RELAY R6：HORNRELAY

R7：F−N−RFRELAY R8：F−N−RRRELAY

R9：BACK−UPLAMPRELAY

RlO：F−N−RSOLENOIDGNDRELAY Rll：PARKINGBRAKERELAY（1） Wl：RIGHTWORKLIGHTRELAY W2：LEFTWORKLIGHTRELAY W3：WIPERRELAY Note：Wl，W2andW3arenotavailable

forAWspecifications．

Fig・8・3 RelayLocation

−173−

8．ELECTRICSYSTEM

8．4 ELECTRJCCIRCU［TDIAGRAM Note：Cordcolors：

Thecordsareclassifiedbycolor・ThefirstsymboIshowsthecablecolorandthe2ndthemarking COlor．

Wirediameter

Wirediametersareshowninthecircuitdiagram・Unlessotherwisespecified，thewirediamet

O．85mm2［0．00132in2］ Wiredia． Cord co10r

⊥

Use

・s叫。m。

円

0．5 L Fuellevelmeter 0．5 BW Charge 0．5 YL Watertemp． 0．5 LG QOSsensor Work［ight（rear） 1．25 RB GL TumL GR TurnR RG Clearancelamp

ABeforetryingtoworkontheelectricsystem，makesuretodisconnectthebatteryOnneCtOr

Whendisconnectingthebatteryconnectors，firstdisconnectthegroundside（一）termlnalbe

removlngtheotherterminal． Note：Theelectriccircuitdiagramisattachedattheendofthisbooklet．

−174−

OPTION

0.5YL YB YR

P. BRAKE

0.5GY

FNR N SIGNAL FNR F SIGNAL

0.5P 0.5LG

→

WR

2

1

6

5

4

RG CB104

CLOCK (RADIO, TACHOGRAPH)

LB

0.5BW WB 0.5RY BrW

WB

LR

R

RW

1.25RB

0.5Y 0.5BL

0.5B

F

BrL

M8

60B

60B 3A

M10

M10 +

(HARNESS ( SS WITH W CAP) C )

12W

GLOW RELAY

BR B

25W

‑ M10

BATTERY CANOPY,1S :80D26R 1S SNOW SPEC.,2S:95D31R

1.25BY

BRAKE LAMP 10W CLEARANCE LAMP 25W

1.25BR

1.25YR

(30Ω)

P. BRAKE MONITOR SW

(20 Ω for F and R)

(20Ω)

2B 3B 3B 1.25B

R [AEX]

60B

B. OIL LEVEL SW

ＯＰＴ．１ ＯＰＴ．２

TRANSMISSION

B ［AEX］ ］ Br

R

S

E

CB104

L

P1 A

P2

B

1.25Y[AE 1.25Y[AE

OIL TANK：

OPTION 2S CAB WIPER

3Y

YL BW LG RL BR

TRANSMISSION

ＯＰＴ．３

2 CAB PWR. SUPP.

BATTERY BATTERY SELECTED BY ENG. STOP MOTOR RELAY

E :STOP E :START

MONI

M5x0.8

YL ［AEX］

WATER TEMP. SENDER

LG

ENGINE 2

CA104

N

STARTER RELAY→

L

ALTERNATOR OPT:60A CB104

ENGINE 1

CONNECT. HARNESS FOR 60A

［AEX］

QOS 2 WATER TEMP. SENSOR

25W

BRAKE LAMP

10W

CLEARANCE LAMP

Note: １．The connectors' female and male are determined on a terminal basis. ２．The connectors of equipment represent those at the harness side.

R

←

M6x1 (HARNESS WITH CAP)

BACK‑UP LAMP TURN SIGNAL (L)

B

A/C

L

E

ROTATION SENSOR

Ｐ RELEASE SOL

GLOW PLUG (QOS) CLOG SW

→WATER TEMP. GAUGE

(30Ω)

R [[AEX]]

M10

F HI/LO SOL

Br[AEX]

1.25B [AEX] [ ] BR B

OPTION

12W 25W

3B

1.25LW

F

Z06GY

ENGINE STOP MOTOR 1.25LR

OPTION SID SID

WATERPROOF

←QOS Q TIMER

F WORK LIGHT L 1.25WY F WORK LIGHT R 1.25YR

BROWN

COMPLETED NMWP02B

1.25B [AEX] [ ]

CONTROL VALVE SOL DETENT

BR YW 0.5LW

2CAB FUSE BOX

CB104

0.5B

L GW LR YB

WASHER F WASHER R WIPER RELAY (COIL)

NMWP02B

0.5GR

L W

(R) (Y) (L) (W)

1.25B

M10 CN04

NMWP02B

BL [AEX] [ ]

(25Ω

NMWP02GY

CB104

R

1.25WR

BACK‑UP BUZZER

12W

B

W B

BP

Z02GY

LB BY

R L 1.25LY 1.25GY

MOTOR TILT‑ ROLL CONTROL Stock Pile & Snow

NMWP02GY

B lgg

LKO

BY LW

Z02GY

NMWP02GY

1.25L [AV f]

1.25B

CN(A)

Lo信号 信号

B)

B W

D

[8]

M4

RW

HEAD LIGH

15

LICENSE NUMBER PLATE LAMP

M10

W B

YL YB

1.25B

M10

Y)

BLACK

REAR FRAME

M10

RG B

0.5Y LY L

WORK LIGHT (REAR)

1.25RB

Z02GY

B

WG

1.25W

1.25YR 1.25B

CLOCK (RADIO)) REAR WIPER FRONT WIPER

GW B

R W

R W

F WIPER SW (LB) ( ) F WIPER (W)

WIPER MOTOR (F)

RG

GW B

0.5Br 1.25W

R

CA104(WATERPROOF ( ）

2RW

5R

ALTERNATOR, B TERMINAL

B

CB104

OPTIONAL LIFT KICKOUT

BUCKET POSITIONER

CLEARANCE LIG TURN SIGNAL (

5R

GB

R

1.25BrW [[AV f]] B

HARNESS SW

CN(A)

1.25R

←BATTERY 1.25B

F

1.25L

OPTION

CA104(WATERPROOF) (

WORK LIGHT, FRONT R

1.25W

PER

1.25RB

25W

CN03 B YW BR

LB

0.5LW L

電源 電源→

CN08

1.25Y

WIPER

1.25LB

L LR R LW RW LB

FRONT/ REAR

LIGHT, OPT

S(F)

5R

LOW HORN BEACON LIGHT

0.5R 2GY 2B 0.5VG

BACK‑UP LAMP TURN SIGNAL (R)

CB104

L LR R LW RW LB

LY LB LW

0.5R 0.5R 2PG 2B 0.5PB

60B M10

WASHER SW

(B) (L) (LB) (LW)

0.5R 0.5R 2Lgg 2B 0.5OrW

L02R

3B 8W

3R 8W

RG

B

OFF

TURN SIGNAL (R)

LB LW

0.5R 0.5R 2V 2Or 0.5YB 2PL

3B 8W 3R

BL [AEX] Br [[AEX]] BrB [[AEX]] W [[AEX]] BW [[AEX]]

1.25RB

GL

LgR L BW YL LG

LB

1.25BrW 2B 1.25LY

B1

QQOS TIMER ((4))←

B L

(R)

CN(A)06 ( )

CN02

FRONT WIPER SW

WIPER MOTOR(R)

M

AIR CONDITIONER (1S, ROPS CAB)

M

8W

[ f]] [AV [[AV f]] [[AV f]]

[AV f] [AV f] [AV f] [AV f]

FRONT WORK LIGHT L FRONT WORK LIGHT R

(F)

HEAD LIGHT (R) 62/62W

(MOMENTARY)

FAST

1.25WY 1.25YR

YW LY

M

A

L

R

OFF

WASHER F WASHER R WIPER RELAY (COIL)

2L 2WB

3A

3Y

OFF

SLOW

2PL 2L 2B

A

LB

W

BR YW 0.5LW

AIR CONDITIONING SPEC. ONLY

A BR

FEMALE (CAP, HOUSING)

GL

CB104

172191‑1(FEMALE PLUG, HOUSING)

BATTERY RELAY 1.25RW 1.25RY 1.25RG 1.25L

R

BR LY

FEMALE (PLUG, HOUSING)

LW LB LY L LB

BLOWER MOTOR

M

BrB

CN(A)

CLEARANCE LIGHT

RG

FEMALE (PLUG, HOUSING)

R

RW

HEATER BLOWER

OPTION LB))

WINDSHIELD WASHER MOTOR

RG

LgR

STOP LAMP FUEL GAUGE CHARGE WATER TEMP. GAUGE QQOS 2 SENSOR WORK LIGHT ( (REAR) ) TURN L

NC COM

G

FNR R

OPT

SENSOR

ROLL CONTROL

[[AVSS f]] BKO/RTD /

SPARE PWR SUPP. (CLRNCE LIGHT)

CB104

0.5LB

1.25RW 1.25RY RG GL

1.25Y

1.25YR 1.25Y 1.25YR

2B 0.5LY

1.25W 1.25L

CN08

HORN

HEAD LIGHT HI HEAD LIGHT LO CLEARANCE LIGHT TURN L

RW LB

L LR R

ON OFF

E

B. LAMP LIMIT SW (Install in open state (pressed))

LgR

0.5B

LW

O

L

R

AUX. BLOWER SW

CLOCK (RADIO)

CN(A)

ENGINE STOP MOTOR (START) ( ) ENGINE STOP MOTOR (STOP) ( )

LB

0.5R 0.5B 0.5B

0.5B 1.25

0.5B

0.5R 1.25 1.25

W

L

1.25W 0.5RB 1.25Gr 1.25RG

M

BrB 0.5OrG

CN02

CA104

BRAKE OIL ENGINE OIL PRESS.

0.5B

0.5L

CB104

L

LW

Hi Lo

M10

1.25B

FRONT FRAME

RW

CB104

ON(2)

PRESSURE SW

ACCESSORY (BATTERY, PRIMARY) RADIO, , ROOM LAMP

L 0.5WB YL

M10

CN03

LB

AUX. BLOWER

LA110

0.5Y 0.5WB

D

ＯＰＴ．１

R

LB

2B

3B 1.25B 0.5B

OPT

LB

ＯＰＴ．２

LR

RW

KEY SW BR→

2B

BRAKE OIL LEVEL

0.5RW

L

R

1 2 3

OFF

LW

LB LY BW WB LW WB

GR GL

OFF

WIPER MOTOR(Side R)

ON(1)

1.25LB 1.25LY 1.25WG

KEY SW C →

H

1.25Y 1.25LR

OFF

R

1.25LB 1.25B 1.25LW

KEY SW C KEY SW BR KEY SW R2 HORN

OFF

3A

HEATER LR

A/C / COMPRESSOR

1.25B

1.25Y 1.25LW

L

CB104

BA

0.5RW

L

SIDE WIPER RELAY L

Hi

CN04

2B B 2B

HEAT RAYS GLASS SW

1.25Y 1.25YR

Me

1.25LW

0.5LY

0.5B

0.5B

ＯＰＴ．３

Lo

L LR R LW RW LB

ILLUMINATION WORK LIGHT, FRONT

0.5Y

RG

BKO/RTD

TU WO

1.25RY

C

Hi Me C B Lo

RG 0.5RL

0.5Y

2B

RADIO RADIO (CLOCK) ( ) 1.25RY

VENTILATION SELECTION SERVO MOTOR

WORK LIGHT, FRONT 0.5RL GLOW LAMP 0.5BG

0.5Y

1.25R

Ｍa

0.5WB

1.25WY

RG

ROOM LAMP

1.25B

RG 0.5RL

0.5GL 0.5BrB 0.5BrW P. BRAKE 0.5BrG HEATER LIGHTING RG TURN G

CA104(WATERPROOF ( ）

1.25L 0.5BG 1.25Gr 1.25BL

b

OPTION

LB

Lo B

GL

0.5RG

1.25B

8

7

0.5B 0.5WB 0.5Y

2 6

FEEDER

OUTLET SWITCHING SERVO MOTOR

R

1.25WG 0.5LB

SWITCH SIDE

Hi

T/M / Lo

P. BRAKE HORN

CN04

Y

0.5GR

SWITCH SIDE

WORK LIGHT PWR SUPP. 1.25LR

CB104(WATERPROOF ( ）

R

Ｍa

CN08N 3

HEATER BLOWER SW

FRONT WORK LIGHT L RADIO

b

AC CONTROL PWR. SUPP.

GR

ANTENNA

(R) (Y) (L) (W)

0.5G 0.5Y

1.3Ω

GR

←電源 電源

HEAT RAYS SIDE WIPER GLASS RELAY RELAY R

A/M / SERVO MOTOR

LW

0.5 OrG 2B BrB 2PL

Ｍ BLOWE

THERMISTER

0.5BrR 0.5OrB

2RG

BLOWER MOTOR

d

e c

0.5YG 0.5WL

CB104 2WS SW

AIR MIX SERVO MOTOR b Ｍa

0.5YW

0.5R 2YR 2L BrB

2W 2W

CB104

SPARE PWR. SUPP.

0.5WB

0.5Lgg

0.5WL 0.5BY 0.5B

OPT

C 0.5RL 1.25RG 1.25RG

HI/LO SW LO SIGNAL FLASHER TO FLASHER FROM

0.5RG 0.5B

0.5GL 0.5GY

0.5GY 0.5Y 0.5BG P.Br S

CONTROL

0.5L 0.5Or PWR. SUPP. Hi/Lo / Sol←

0.5L

0.5LW

0.5LB 0.5L 0.5L 0.5GW 0.5LW 0.5LW 0.5L 0.5L 0.5GW

0.5L

P.

P. Br RELAY(1),(2)

D

0.5LB

P.Br Sw→

6

CN03

0.5GR 0.5P 0.5WL

2L P BRAKE RELEASE SOL ←

4

P.

0.5GL

0.5BrG

0.5GY

2

YB YR

7 9 8 13 15

HORN SW

LOAD DAMP RELAY→

FLASHER

FRONT WIPER RELAY

0.5B

NEUTRAL

ROOM UNIT

LW

ACC R2

NMWP06GY

CARLING SWITCH VCH HOUSING

1

E

R WORK LIGHT RELAY

0.5LW

ENG. STOP

CONDENSER

YB YL

0.5L

0.5LB

BrY

1

COMPRESSOR

W W3

0.5RL 0.5RL 1.25RG 1.25YR 0.5B 0.5B

FNR SOL

W W1

0.5B

P BRAKE

W W2

2Or

RELAY BOX

Me (2) RELAY(AR3)

1.25B 2Lgg 2PG 2GY

CB104

Me (1) RELAY(AR2)

2B

TAGS ATTACHED TO HARNESS CONNECTOR

HI HI RELAY(AR4)

2PL 2YR BrB

3W

L WORK

0.5WL 0.5L 0.5LY

P BRAKE

2

0.5OrB 0.5BrR 0.5G

. SUPP. 0.5R 0.5WL 0.5YG

TAG

SPARE PWR. SUPP.

3W

OPT

RELAY BOX 10

MODE SERVO MOTOR MODE SERVO MOTOR IN/OUT / SERVO MOTOR

3W

AM SERVO MOTOR

8W

3W BrY

WORK LAMP(R)

WB

R11

0.5VG 0.5PB 0.5OrW 0.5YB 0.5LgY g 0.5B 0.5YW

8W

M2

FLOOR MAIN RELAY(AR1)

0.5R

0.5WBRRADIO,DOME LAMP

1.25LR

3

FLOOR MAIN AM SERVO MOTOR

3W

LY

R.WIPER & WASHER

M1

OPT

F.WIPER

LY

WR 2RG

L

1.25R L

0.5BR 0.5BR

0.5RL 0.5BG

0.5BrB

0.5LY 0.5LY 0.5LY 0.5BrW

0.5WY

0.5B

0.5LY 0.5G 0.5GB

0.5B 0.5B

0.5LB

0.5LY 0.5LY

0.5B 0.5B

0.5LG 0.5WL 0.5WL

0.5WB KEY SW BR→

1.25R

CONDENSER FRONT WIPER RADIO, , ROOM LAMP REAR WIPER

LOAD DAMP RELAY←

18

NMWP10B

GL

(R) (Y) (L) (W)

C

3W

A/C CONDENSER

B

WIPER MOTOR(Side Ｌ)

CONNECTOR

WB BLOWER

2Y

OPTION 1S,ROPS CAB WIPER

2W

WR

RY RB BrY 0.5RY

0.5

ACG L TERMINAL→

2

1.25B

Y L W

1.25LR

2

2W

WATER TEMP. SENSOR GLOW RELAY→

YB

Tags attached to harness connector (R11 ( only) y)

MOTOR TILT‑ROLL L 5 CONTROL HI/LO Stock Pile & Snow

S & S

KEY

RES

(W)

GLOW

QOS TIMER (ATTACHED TO ENGINE)

1

LY L

L GW LB YB

0.5WY

0.5B 0.5B

(28) ((27))

((20))

( ) (21)

0 5B 0.5B

CONNECTOR

P. B. PWR. SUPP.

(R) (Y) (L) (W)

2W

WORKING LAMP

KEY SW R2→ GLOW PLUG→

M10

5 3

T/M HORN LKO/BP

LO ＨＩ

1

100

B

R

C

6

0.5GY

F

1.25B

WIPER MOTOR (F)

W

0.5 0.5

1.2 1.25R

BEACON LIGHT POWER SUPPLY 1.25Y

Y

FRONT WORK LIGHT RELAY←

HEAT RAYS GLASS POWER SUPPLY

R2

CNA02

R L L 0.5LW LB B YL

0.5LW

LW LB 電源→ LY

1.25W

1.25YR

1.25B

1.25YR

CB104 (WATERPROOF）

2W

F‑N‑R POWER

0.5WL

→CONTROLLER

2W

TURN,BRAKE,BACK ALARM

G

LW

16

5

CN06

CN08 CN03

OPTION

14

CANOPY

PARKING BRAKE SW

LB L LW

WORK LIGHT(OPT) (FRON

LIGHT

1.25R

2RG

START

CN03 B YW

BEACON LIGHT

BR ACC R1

ON

L LR R LW RW LB

ON OFF

HORN RELAY

12

YR

REAR WIPER SW

PARKING BRAKE

0.5BrG

CONTROLLER→

FRONT/ REAR

FRONT WIPER SW

L 2

Ａ／Ｃ

SIDE CONSOLE (COMMON TO 1S and 2S)

2W

0.5BrR

0.5BrB

ON

B LY LB LW

G TURN L

FAST

B

WB 0.5BW 1.25WR

OFF

BACK‑UP LOAD DAMP LAMP RELAY RELAY

OPTION

0.5BrW

RB

CN04 (B) (L) (LB) (LW)

LB LW

LW

LR RB

B L

LB

OFF

B

H

F‑N‑R

R 8

OFF

T/M Hi

L

WIPER MOTOR (R)

CHARGE

(MOMENTARY) WASHER SW

CN02

MONITOR BRAKE O

R LB SLOW

( ) (25)

(19) ((18))

( 9)) ( 5)) ((17))

( 4)) ( 8))

(13) ( 3)) ( 2))

CN02

OFF

MONITOR LIGHTING 0.5RG WORK LIG

F

L

1

0.5BW

1.25YR 1.25Y 1.25YR 1.25L 1.25Y

LR

W

Hi‑Lo

7

FRONT/ REAR

0.5B 0 5GL

1.25W 1.25L

R

R

6

BATT. RELAY←

OFF L

FNR R RELAY

PWR. SUPP.→ 0.5Y 0.5Y 0.5Y 0.5BR

WORK LIGHT SW CANOPY

SW SIDE

FNR F RELAY

4

0.5LY

FNR N SIGNAL QSS SW HI/LO SOL RELAY H/L SW LO SIGNAL

LB

OFF

CN08

BRAKE OIL PRESS.

LW

H L LR R LW RW LB

ラジオ ラ オ ラジオ( ラジオ (時計 時計) )

R

L

0.5B

0.5B

0.5L

2

0.5RW 1.25R 1.25RY

3A

LR

( 7)) ((15))

L

9

ACC

0.5L

T/M / ROTATION SENSOR

COLUMN SW ASS'Y

BEACON LIGHT SW

5 4 1

BEACON

RW

HEAT RAYS

8

3R

HAZARD

0.5Y

(15) (16)

CN06

SW SIDE

1.25WR

2

DIODE (3A)

ACG‑L TERMINAL, , BATT. CHARGE ACC PWR. SUPP ACC PWR. SUPP

1.25B

3

1.25RY

20 19

1.25RY

BATTERY

R

1.25B

CONTROLLER

0.5RW

14 10 12

1.25R

AIR CONDITONER (1S,ROPS CAB)

CONNECTOR KIT GB

7

OPTION

AIR COND. CONTROL WORK LIGHT ( (CAB) )

LR

FRONT/REAR

1 4 2 5 3

0.5LB

FRONT/ REAR

0.5Y

FUSE BOX

QSS Sw

RELAY SIDE

Numbers written on relay box ( (1‑10) 0)

(2)

COCKPIT

OFF

T/M Hi

km/h

0.5W

ROOM LAMP CN02

1.25B

LIGHTING

0.5YL

FRONT ONLY

CA104(WATERPROOF ( ）

1.25B

0.5B 0.5WB 0.5Y

1.25WY

CB104(WATERPROOF ( ）

(12)

2 6

7 3 8

RADIO FEEDER

(2)

WORK LIGHT SW CAB FRONT

SPEEDOMETER

MONITOR

0.5B

WORK LIGHT(OPT) (FRONT) L

ANTENNA

FLOAT (FUEL LEVEL)

ELECTRIC WIRING DIAGRAM FOR THE L13‑2 AND L16‑2 This electric wiring diagram is supplied with the Service Manual No. SEW‑619AE.

No．SEW−619AE

lssued：June，2001

TCJmc。R，。RAT． INTERNAT10NALMARKETINGDIVIS10N： 1−15−5，Ni＄hi−＄himbashi，Minato−ku，Tokyo lO5−0003，Japan FAX：JAPAN＋81・3−35918152，3−35918153

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