TCM L13-3 L16-3 Wheel Loader Service Manual SEW-619CE - PDF DOWNLOAD

No．SEW−619CE

T℃訓閲㊥ 至≡三￣√：3≡ユニ‡二三こニ＝

WHEEL＿L．OADER

上たぎ＿ヨ （SerialNo．05101andafter）

上J6＿ヨ

（SerialNo．02101andafter）

TCMCORPORAT10N

SEW−619CE

FOREWORD TCMoffersawidevarietyofwhee1loaderswhichhavebeenenthusiastica11ywelcomedbyusersall overtheworld．

TCMModelsL13−3andL16−3，articulatedtypewheelloaders，arethelatestproductsdevelopedfro

yearsofresearchandexperience・Togetthemostoftheloader，itisrequiredthatyoubecomefam withitsfeatures，COnStruCtion，OPeratlngandmaintenanceprocedures・

ThisServiceManualexplainsthestructureoftheaboveloadersforservicepersonnelandshopworkers

Wehopeitwillbeyourreferenceguideduringserviclngjobs・ Forstandardservicevaluesandtheprocedureforinspection，SeetheInspectionManualandforthe

PrOCedureformaintainlngeaChcomponentunit，SeetheShopManualoftheirrespectivecomponen

ThedescrlPtlOnSandspecificationsdescribedinthismanualaresubjecttochangewithoutnotice・ July，2004

7P伽c。R，。RÅ，，

ThisServiceManualcoversthefollowlngloadermodels： L13＿3：＃05101andafter L16＿3：＃02101andafter

（EmptyPage）

SEW−619CE

TABLEOFCONTENTS 0．SPECIFICAT10NS 0．10UTERVIEWS 0．2 SPECIFICATIONS

4

l

∠U

l l

OO

1．7 ENGINECONTROLUNIT

l

1．6 ELECTRICALSYSTEM

2

1．5INTAKEANDEXHAUSTSYSTEM

l

1．4 FUELSYSTEM

1

1、．3 COOLINGSYSTEM

l

1．2 LUBRICATINGSYSTEM

1

1．1ENGINE

7

1．ENGINEANDRELATEDCOMPONENTS

O

つ﹂

2．POWERTRAIN 2．1HSTUNIT 2．1．1HYDRAULICDRIVE 2．1．2 HSTANDHSTCHARGECIRCUIT 2．1．3 HSTCONTROL 2．2 HST PUMP 2．2．1GENERALDESCRIPTION 2．2．2 PUMPCONTROL 2．2．3 FNRSOLENOIDVALVE 2．3 HSTMOTOR 2．3．1GENERALDESCRIPTION 2．3．2 REGULATOR 2．3．3 DIRECTIONCONTROLSOLENOIDVALVE 2．3．4 FLUSHANDBOOSTVALVES 2．3．5 MOTORTIIJ−ROLLINGSPEEDCONTROLVALVE 2．4 TRANSMISSION 2．4．1CLUTCHSHAFT 2．4．2 TRANSMISSIONCONTROLVALVE 2．4．3 TRANSMISSIONCIRCUIT

2．4．4 QUICKSHIFTSWITCH（QSS） 2．5 PROPELLERSHAFT

SEW−619CE

7

7

7

7

2．6 DRIVEAXLES（FRONTANDREAR）

8 8 8

3 5

00

5

2．6．2 DIFFERENTIAL

1

2．6．1AXLE

5

00

2．6．3 FINALREDUCTIONGEAR

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

︵‖6

︵X︶

3．BRAKE SYSTEM 3．1SERVICEBRAKE

8

︵X︶

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

つJ

qノ

3．1．3 DISKBRAKE

7

0ノ

3．1．4 BRAKEOILTANK

1 1

0

2

1

1

1 1 1

qノ

1

4．3 STEERINGWHEELUNIT

1 1 00 000 1 0

4．1GENERALDESCRIPTION

57′07

4．STEERING SYSTEM 4．2 0ILCIRCULATIONROUTES

0

3．2．4 DISKBRAKE

qノ

1

3．2．3 PARKINGBRAKESOLENOIDVALVE

qノ

3．2．2 PARKINGBRAKEELECTRICCIRCUIT

0ノ

1

3．21GENERALDESCRIPTION（BRAKELINE）

︵XU

3．2 PARKINGBRAKE

1

O

4．5 PRIORITYVALVE

l ∠U 1

2

4．4 STEERINGVALVE（ORBITROL） 4．6 STEERINGCYLINDER

5．FRAMEANDCOCKPIT 5．1FRAME 5．2 CENTERHINGEPIN

6．HYDRAULICSYSTEM 6．10ILCIRCULATIONROUTES 6．2 PUMP

SEW−619CE

1

7 7 0 4 7 0ノ2 2 5 ′0 7 史U OO 0 0J ノ 0 0 2 3 4 Oノ O つ つ J 3 4 4 4 4 5 5 5 U ′0′ん l l 5 l 5 l 5l 5l 5・l l∠U l 7 7 7 7 7

6．3 CONTROLVALVE

1 1

6．3．3 RELIEFVALVE

1

6．3．2 0PERATION

1

6．3．1GENERALDESCRIPTION

1

6．4 VALVECONTROLS 6．5 0ILTANK

7，LOAD HANDLINGSYSTEM 7．1BOOM，BELLCRANKANDBUCKET 7．1．1GENERALDESCRIPTION 7．1．2 BUCKET

7．1．3 BUCKETLEVELER

7．1．4 BOOMKICKOUT（OPTION） 7．2 CYLINDERS 7．2．1BOOMCYLINDER 7．2．2 BUCKETCYLINDER

7．3 ANTI−PITCHINGSYSTEM（APS）［OPTION］

1 1

8．2．2 LIGHTINGSWITCHANDTURNSIGNALSWITCH

1

8．2．10PERATINGSTATUSMONITORS（CLUSTERMETERUNIT）

1

8．2 METERSANDSWITCHES

1

8．1LIGHTINGUNIT

1

8．ELECTRIC SYSTEM

1

8．3 LOCATIONOFRELAYS 8．4 ELECTRICCIRCUITDIAGRAM

（Emptypage）

0．SPECIFICAT10NS

0．SPEC］FICAT10NS 0．10UTERVIEWS （L13−3andLX70r7Withawning） Unit：mm［in．］

Fig．0．10uterViews（L13−3andLX70，7Withawning） 一1−

0．SPECIFICATIONS

（L16−3andLX80・7Withawning） Unit：mm［in．］

￡寸N

﹇ト．︻ト﹈○記︻

﹇？ト巴

Fig．0．2 0uterViews（L16−3andLX80−7Withawning）・ −2−

0．SPECIFICAT10NS

（L16−3andLX80・7With＄teelcab） Unit：mm［in．］

Fig．0．3 0uterViews（L16−3andLX80−7Withsteelcab） −3−

0．SPEC（FICAT10NS

0．2 SPECIFICATIONS Loadermodel

L13・3，LX70−7

L16・5，LX80・7

Front−endarticulatedloaderwithdieselenglne

Type Perrormance

Bucketcapaclty，heaped

1．3［1．7］

rn3［y3］

Breakoutforce，bucketcylinder kN（kgf）［1bf］ 61．7（6300）［13892］ SAEratedoperatingload，fu11turn

2080［4586］

kg［lbs］

Risingtime，ful1load Loweringtime Bucketdumplngtime

1．6［2．1］ 79．4（8100）［17861］ 2560［5645］

s

5．0

5．6

s

3．0

3．0

s

1．0

1．2

Travelspeed，fwdlst

km／h［mph］

12．5［7．8］

12．5［7．8］

fwd2nd

km／h［mph］

34．5［21．4］

34．5［21．4］

revIst

km／h［mph］

12．5【7．8］

12．5［7．8］

rev2nd

km／h［mph］

34．5［21．4］

34．5［21．4］

Max．tractionforce

kN（kgf）［lbf］ 58．8（6000）［13230］

Gradeability，fwdlst

71．6i7300）［16097】

250incline

250incline

Min．turnlngradius OutermOStPartOfbucket

mm［in・］

5215【205．3］

5470［215．4］

CenterOfoutermostwheel

mm［in．］

4440［174．8］

4690［184．6］

mm［in・］

6085［239．6］

6360【250．4］

mm［in．］

6115［240．7］

6370［250．8］

mm［in．］

2180［85．8］

2320［91．3］

mm［in．］

2340［92．1］

2480［97．6］

mm［in．】

2900［114．2】

2995［117．9］

mm［in・］

3060［120．5］

3150［124．0ト

Overalloperatingheight， bucketfullyraised

mm［in・］

4530【178．3］

4685【184．4］

Wheelbase

mm［in．］

2600［102．4］

2725［107．3］

Tread，frontwheels

mm［in．］

1725［67．9】

1820［71．7］

mm［in．］

1725［67．9］

1820［71．7］

Dimensions

Overal11ength，bucketonground incarryposition Overallwidth，loaderbody bucket

Overallheight，tailpIPe （topofawningforL13−3，LX70−7； topofsteelcabforL16−3，LX80−7）

rearwheels

−4−

0．SPECIF［CAT10NS

L13・3，LX70・7

L柑・3，LX＄0・7

32

35

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，at45Odischargeangle

1000［39．4］

1020［40．2］

O

48

48

O

48

48

980［38．6］

1090［42．9］

Rearoverhangangle

O

mm［in．】

mm［in．］

Bucketrollangle，incarryposition Bucketdumplngangle， bucketfu11yraised Tbwingpinheight

mm［in．］

Ⅵreight

Weight of the loader

kg［lbs］ 6410【14134］（W／awning） 6680［14729］（W／steelcab）

一5−

0，SPECIFICAT10NS

N OTE

】■■ −− − 一 一・・・一 一▲− −■ ◆− − −■−− − −一・−■・・▲− − − −−− − − − −■一− − − − −−■ −− − − − −■一 一 −−−▼− − − − −− ■▼− − − ▲一− − − − − −▲▲一 − − − −・■ − −一・

−6−

1．ENGINEAND RELATEDCOMPONENTS

1．ENGINEANDRELLATEDCOMPONENTS 1．1ENGINE l．GeneralDe＄eription

TheenglnemOuntedonthisloaderisa4−CyCle，Water−COOled，OVerheadvalve，in−1ine，directlnJeCti typedieselenglneWithaturbocharger・

Theenglneismountedattherearoftheloaderanditspoweristransmittedthroughtheflywheel， COuPlinggear，andhub，intotheHSTpump・

−7−

1．ENGINEAND RELATED COMPONENTS

Enginemodel

IsuzuBB−4BGITforL13−3，LX70−7 IsuzuDD−4BGITforL16−3，LX80−7

Type

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

Numberofcylinders−borexstroke

lnjeCtiontypewithturbocharger 4−105mmx125mm［4．13in．x4．92in．］

Total displacement

4．329L［264．2in．3］

Compression ratio

18

Engineperformance

Ratedspeed

2100rpmforL13−3，LX70−7 2200rpmforL16−3，LX80L7

RatedotltPut

64．7kW（88．Ops）forL13−3，LX70−7 80．9kW（110．Ops）forL16−3，LX80−7

Maximumtorque

314N−m（32．Okgf−m）【231．51bf−ft］brL13−3，LX70−7 363N−m（37．Okgf−m）［267・61bf−f［］fbrL16r3，LX80−7

FuelconsumptlOnatratedpolnt

253g／kWhr†186g／pshr）forL13−3，LX70−7 257g／kWhr‡189g／pshr）forL16−3，LX80−7

Dry weight

375kg［826・91bs】

Dimensions（OVeralllengthx

OVerallwidthxoverallheight） Firing order

925．7mmx707mmx855mm［36．4in．x27．8in．x33．7in．

Rotational direction

Clockwisewhenviewedfromcoolingfanside

Starting aids

Glow plug

Enginestopplngmethod

Keyswitch

1−3−4−2

Unloadmax．speed （whenseparatelymeasured）

2300rpmforL13−3，LX70−7 2500rpmforL16−3，LX80−7

Unloadmin．speed

（Whenseparatelymeasured） Allowabletiltingangle

1OOO rpm 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．］ Injection timing

90beforeTDC

Injectionstartpressure

18．1MPa（185kgf／cm2）【2613psi］

Compressionpressure

3．04MPa（31kgf／cm2）［441psi］at200rpm

Note：ForthemaintenanceoftheenglnePrOPer，SeetheWorkShopManualforIsuzuIndustrialDie EnginesAA−4BGIT，BB−4BGIT（No．IDE−2370）publishedbyIsuzuMotorsLimited・ −8−

1．ENGINEAND RELATED COMPONENTS

2．Outerviews

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

11．NOZZLEHOLDER 12．INLETMANIFOLD 13．0ILFILTER 14．OILPRESSURESWITCH 15．FUELFILTER 16．WER SEDIMENTER 17．INJECTIONPUMP 18．FEEDPUMP 19．COOLINGFAN

Note：TheabovesketchesshowtheenglnemOuntedontheL13−3andLX70−7・Thestructure englnemOuntedontheL16−3andLX80−7isalmostthesame・ Fig．1．14BGITDieselEngine −9−

1．ENGINEAND RELATED COMPONENTS

3．EngineMounting

Theenglneisconnectedtothedriveunitandsupportedbytherearframeat4polntSOntherightand leftsides，Withmountlngrubbersatbothsidesofthecylinderbody・

Note：D＞（妄：：：：コ42to48N−m（4・3to4・9kgf−m）［31to351bf−ft］ B＞ぢ：：：：コ235±24・5N−m（24±2・5kgf−m†［174±18・11bf−ft］

1．ENGINE

5．PLATE

9．EYEJOINT

2．BRACKET

6．BRACKET

3．CUSHIONRUBBER

7．PACKING

4．（REARFRAME）

8．EYEBOLT

lO．HOSE ll．PLUG 12．ADAPTER

Fig．1．2 MountlngOfEngine −10−

1．ENGINEAND RELATEDCOMPONENTS

1．2 LUBRICATING SYSTEM Lubricating pump

Forcedcirculationmethod Gearpumpdrivenbythecamshaft

Filtration

Full−flowfilterpapertype

Cooling

Built−incoolingsystem PistonandsprlngtyPe 13L［3．4U．S．gal．］

Lubric ation

Oilpressureadjuster LubricatlngOilcapaclty

TheenglnePartSarelubricatedbyforcedcirculationmethodbytheoilpump・TheenglneOilpi

upfromtheoilpanbytheoilpumpanddirectedunderpressure，PaSSlngthroughtheoilfilterandtheoil cooler，tOtheoilgalleryfromwhichtheenglneOilisdeliveredtopachsectionforlubrication，befor returnlngbackintotheoilpan・

TheoccurrenceofanabnormalenglneOilpressureismonitoredbyboththeoilpressureswitchand

theoilfilterclogglngWarnlngSWitchanddisplayedbywayofthe Engineoilpressure＝warnln oftheclustermeteronthedashboard．

0ルPAN

Fig・1・3 SchematicDiagramofEngineLubricatlngSystem

−11−

1．ENGINEAND RELATED COMPONENTS

1．3 COOLING SYSTEM Cooling

Water−COOledtype

Coolingfan

Type

Pushertype，550mm［21．7in．］dia．，7−bladed

Driving

Belt driven

Belt−drivenvolutepump

Water pump Waterthermostat

Type

Wax−Pellettype

Temp．atwhichvalvestartsopenlng

820C［1800F］

Temp．atwhichvalvefu11yopens

950C［2030F】

Radiator forenglne

Corrugatedfin（Wavy）

foroilcoolerworkingoil

Corrugatedfin（Wavy）

cap working pressure

49kPa（0．5kgf／cm2）［7．11psi］

dry weight

Approx．65kg［1431bs］

Cooling water capacity

23L［6．08U．S．gal．］（totalcapacity）

Fig．1．4 SchematicDiagramofEngineCoolingSystem

−12−

1．ENGINEAND RELATED COMPONENTS

View100kingfromA

Note：D＞6：＝コ90N−m（9kgf−m）［651bf−ft］ B＞6：：：＝コ230N−m（24kgf−m）［1741bf−ft］ 恒＞ぢ＝コ20N−m‡2kgf−m）［151bf−ft］ 駐＞ぢ：：：：：コ40N−m（4kgf−m）［291bf−ft］

1．FANGUARD 2．DRAINCOCK

5．RADIATOR 6．PLATE

3．UPPERHOSE，

7．LOWERHOSE，

RADIArOR 4．RESERVOIRTANK

RADIATOR 8．HOSE

Fig．1．5 EngineCoolingSystem −13−

1．ENGINEAND RELATEDCOMPONENTS

1．4 FUEL SYSTEM L13・3，LX70・7（BI喜一4BGIT）

L16・3，LX80・7（DD・4Ⅰ主GIT）

Injectionpump

Boschtype（1ine）

←

Injectionnozzle

Poroustype

←

Fuel feed pump

Plungertype（Withmanualpump）

←

Filterpapertype

←

Fuelnlter Governor Governlng

Centrifugal，all−SPeedcontrol

←

（RSVtype）

Lubrication Fuel tank capacity

Forcedcirculation 130L［34．3U．S．gal．］

←

155L［41．OU．S．gal．］

1．GeneralDescription

Thefuelfeedpumpdrawsfuelfromthefueltankthroughthewatersedimenterandsendsitunder pressure，PaSSlngthroughthefuelfilter，tOtheinJeCtionpump・ThefuelisthendistributedtotheinJeCtion nozzleandinjectedintothecylinder・

1．FUELTANK 2．WERSEDIMENTER 3．FEEDPUMP

4．FUELFILTER 5．INJECTIONPUMP 6．INJECTIONNOZZLE

7．OVERFLOWVALVE 8．OVERFLOWVALVE

Fig・1・6 SchematicDiagramofEngineFuelSystem −14−

1．ENGINEAND RELATEDCOMPONENTS

2．FuelTank

Thefueltankisweldedtotheinsideoftherearpartoftherearframe，Withitsfuelhoses（SuCtionand return）connectedtotheengine．

ThefueltankisequlPPedwithafhellevelsenderunitwhichdisplaysthefuellevelonthefuelmeter ofthedashboard．

④fromINJECTIONPUMP

（診towArERSEDIMENTER（FUELFEEDPUMP） 1．FUELSENDERUNIT 2．FUELHOSE，SUCTION 3．FUELHOSE，RETURN

4．REARFRAME 5．FUELTANK

6．BREATHERHOSE 7．STRAINER 8．CAP 9．COVER lO．SPRING

Fig．1．7 EngineFuelSystem −15−

11．COCK 12．PLUG 13．NIPPLE 14．PLATE

1．ENGINEAND RELATEDCOMPONENTS

1．5］N−rAKEAND EXHAUSTSYSTEM L13−3，LX70・7（BB・4BGIT）

Aircleaner

Ll ・3，LX80−7（DD・4BGIT）

Cyclonefilterpapertype（8 ）

←

Porous separators

←

TDO4HL

TDO4H

Turbocharglng

Exhaustturbocharger

←

Lubrication

Forcedcirculation，Oilcooled

←

Muffler Turbocharger Name

1．GeneralDe＄Cription

Theintakesystemoftheenglneisdesignedsothattheoutsideopenairisdrawnthroughtheair cleanerintotheinletmanifold・TheaircleanerisequlPPedwithadustindicator・Theelementneedsto becleanedwhenthewarnlnglightcomeson・

Theexhaustsystemisdesignedsothattheexhaustgasfromtheexhaustmanifoldispassedthrough themufflerwherethepressureandtemperatureoftheexhaustgasarelowered，anddischargedthrough thetailpipeintotheatmosphere・

A Becarefu1nottotouchthemufflerorexhaustmanifoldsincetheyarehotwhentheengineis runnlngOrfbrawhileafteritisshutoff；Otherwiseyoumightburnyourhand・

Turbocharger ItispossibletoattainhighenglneOutPutbysendinghighlycompressedairintothecylindersonthe intakestroketoincreaseairsupply，thusincreaslngthequantltyOffueltobeinJeCted・Toachievethi

purpose，theL13−3，LX70−7，L16−3andLX80−7areequlPPedwithanexhaust−drivepturbocharger・ Theturbocharger，sexhaustgasinletisconnectedtotheexhaustmanifold・Theexhaustgasro theturbinewheelatahighspeed，beforebeingroutedthroughtheexhaustgasoutletintothemuffler・ Therefore，theimpeller，mOuntedontheoppositeendofthesameshaftastheturbine，alsorotatesa

ahighspeedtocompresstheairdrawnthroughtheaircleanerandsendsittotheintakemanifold・

−16−

1，ENGINEAND RELATEDCOMPONENTS

Detail of band fixin

Note：Thesketchshowstheintakeandexhaust

慧監り 臣 匪

Note：

SyStemOftheL13−3andLX70−7・The structure of the intake and exhaust syste oftheL16＿3andLX80−7isthesame．

24N−m（2．4kgf−m）［17・41bf−ft］

Threadedarea：LOCTITE＃262

27N−m‡2．7kgf−m）［19．51bf−ft］

Note：Themufflerbandistightenedwiththe nut（A）to20N−m（2kgf−m）［14・51bf−

ft］andsecuredwiththelocknut（B）．

Threadedarea：LOCTITE＃262 Note：Assemblethemufnerbracket

91．2N−m（9．3kgf−m）［67．31bf−ft］

Tighten each part temporarily. Assemble

匪

themintheorderof①−→＠瑚， using caution not to apply unnecessary fbrceonthemufnerandtube．

1．TAILPIPE

5．BRACKET

9．BRACKET

2．BAND 3．MUFFLER 4．BRACKET

6．BRACKET 7．AIRCLEANERHOSE

lO．ENGINE

8．AIRCLEANER

Fig．1．8IntakeandExhaustSystem −17−

ll．STAY 12．SPACER

1．ENGINEAND RELATEDCOMPONENTS

1．6 ELECTRICAL SYSTEM Battery

Voltageandcapaclty

12V52Ah（5−hourrate）forL13−3，LX70−7 12V55Ah（5−hourrate）forL16−3，LX80−7

Quantity

2

Weight（PerCaSe）

16．3kg［35．91bs］forL13−3，LX70r7 18．3kg［40．31bs］forL16−3，LX80−7

Startermotor

Type Voltageandoutput

Electromagneticplnion−Shiftreductiontype 24V．4．5kW

Alternator

Voltage and output

AC type 24V50A

Driving

Belt−drive

Type

Automatic charging regulator

Type

ICregulator（integrated）．

Coldstartlngaids

Glow plug

Stopplngdevice

Fuelshut−0ff，StOPmOtOrtyPe

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

A Danger！！Useduecautionwhenhandlingthebatteryunit． 1・Nofire・Nospark・Neversmokeorusefireornakedflamenearthebatteryunitsinceflammable gasisalwaysreleasedfromthebatterybox・

2．Thebatteryelectrolyteisdilutesulfuricacid・Itwillcausepainfu1andseriousburnsifit ontheskin．Itcancauseblindnessifitgetsintoeyes．Ifelectrolytegetsontoyourskin，flush

OffwithacoplOuSamOuntOfwaterandgetmedicalhelp・Ifelectrolytegetsintoyoureye flushyoureyesoutwithacoplOuSamOuntOfwaterandgettoadocton

−18−

1．ENGINEAND RELATEDCOMPONENTS

2．EIectricCircuit

Fortheelectriccircuitdiagramoftheenglne，referto＝8・4ElectricCircuitDiagram・ （l）Generaldescription

①Theenginecol■dstartingaidisaglowplug・

IfacoldenglneWOn，tstart，turnthestarterswitchtothe‖ONりpositiontoenerglZetheglowplug thuspreheatlngtheenglne・Then，turnthestarterswitchtothe＝START positiontocran englne・

②Theenginestoppingdeviceisafuelshut−0fftypewhichstopstheenginewhenthestarterswit turnedtothe OFF position．（Engineshut−0ffdevice）

FormoreinformationontheenglneShut−0ffdevice，referto＝1・7ENGINECONTROLUNIT・ （2）Starterswitch Thestarterswitchhasthreepositions：OFF，ONandSTART・

a Engine Neutral Start UnlessthetransmissioncontroIswitch（Shiftlever）isinneutral，theenginewon tstart・ ThispreventstheloaderfrommovlnguneXPeCtedlywhenthestarterswitchisturnedon・

「knllhal

Position

B BR ACC Rl R2 c l

OFF ON

START

Fig．1．9 StarterSwitch

ー19−

○

1．ENGINEAND RELATED COMPONENTS

l．7 ENGINE CONTROL UMT l．Accelerator PedaJ

TheenglneSPeediscontrolledbyoperatlngtheacceleratorpedal・ Whentheacceleratorpedalispressed，thegovernorcontrolleveroftheenglneisactuatedthrough

thecontroIcablesothatanenglneSPeedmostsuitedtotheworkingconditioncanbeobtained・

Note：Adjusttheacceleratorcableandstopperintheorderof④，⑧and⑥‥ ④Extendthethreadedpartofthecableaslongaspossible・

⑧Runtheengineatlowrpmandadjusttohaveaplayof3to5mm［0・12to O．2in．］atpartindicatedbyanasterisk（※）・

⑥Runtheengineathighrpmandmakesurethepedalisclosecontactwit thestopper． 1．ACCELERATORPEDAL

5．PEDALCOVER

9．STOPPERBOIJ

2．CABLE

6．PEDAL 7．PIN 8．BRACKET

lO．ROD

3．BRACKET 4．ENGINE

Fig．l．10 AcceleratorPedal −20−

ll．BELLCRANK 12．SPRING

1．ENGINEAND RELATED COMPONENTS

2．EngineShut−OffDevice

AdieselenglnedoesnothaveanyelectriclgnltlOndevicelikeagasolineenglne，SOitcannotusually beshutoffsimplybyturningthemainswitch（StarterSWitch）0ff・

Forthisreason，thewheelloadershaveanenglneShut−Offdeviceusingastopmotor・Whenthe starterswitchisturnedtothe OFF門position，theenglneStOPmOtOraCtuateSthegovernorstoplever cutoffthesupplyoffueltotheinJeCtionnozzle，thusshuttingofftheenglne・

1．GOVERNOR 2．GOVERNORSTOPLEVER 3．INJECTIONPUMP

2

Thestopmotor，mOuntedontherearframe，OPerateSthegovernorstopleverwiththewireattac themotor．

Fig．1．11EngineShut−0ffDevice

−21−

1．ENGINEAND RELATEDCOMPONENTS

N OTE

■− 一 一 − − − − −− − − −■−■− − − − − − − − − −− − −・・− − − − − − − − 一・− − − −・・・− − −−−− −▼ 一 一・・− − − − − − − −− − − − −−− − − −

−22−

2．POWER TRAIN

2．POWERTRAIN

ThepowertrainconsistsoftheHSTunit，tranSmission，PrOPe11ershafts，frontaxle，rear

tlreS． PowerfromtheenglneistransmittedthroughtheHSTunittothetransmissionwheretherotational

SPeedisconverted，anddelivered，PaSSlngthroughthepropellershafts，tOthefrontandrearaxles．

Thepowertransmittedtoeachaxleisfurthersentthroughthewheeltothetiresothattheloader mOVeS．

一23−

2．POWERTRAIN

TheschematicdiagramofthepowertransmissionoftheloaderisglVenbelow・

Fig．2．1PowerTrain

−24−

2．POWERTRAIN

2．1HSTUNIT 2．1．1HYDRAUuC DRIVE

l．GeneralDescription Hydraulicdrivesconvertenginepowerfirsttofluidpowerandthentomechanicalpower（1inearor

rotationalmotion）whichdrivesthewheelsorothercomponents．Thefluidtobeusedismineralhydrauli

Oil．Inthissense，yOuCanCallallhydraulicdrivesatypeofhydrostatictransmission（HST）．Howe

thehydrostatictransmission（HST）generallymeansthekindofhydraulicdrivethattransmits rotationalpower・

Hydraulicdrivesareclassifiedintotwotypes：thehydrostatictypewhichusespressureenergyand

thehydrodynamictypewhichuseskineticenergy． （1）HydrodynamicUnit The hydrodynamic unit uses kinetic energy

PrOducedbyfluidflowlngatahighspeed・Thehigh− SPeed，low，PreSSure fluid discharged from the

Centrifugalpump，hitstheturbinewheelbladestoturn

theturbinewheelandthustheturbineshaft，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．Thiskindofunitisusedforskidsteerwheel

Fig．2．3

loaders andsmall−Sizedwheelloaders．

ー25−

2．POWER TRAIN

2．HydrostaticTransmission（HST）

Theoperatingprincipleofthegeneralhydrostatictransmission（HST）whichusesavariablecapacit axialpistonpumpandmotorfortheHSTpumpandHSTmotor，reSPeCtivelyisglVenbelow・

（1）OperatiomofHSTPump

①Whentheslidingsurfaceoftheswashplateisflatandpositionedvertically，thesystemstand neutralandnooilisdischarged・Evenifthedriveshaftrotates，thesuctionanddischargeofoilis notperformed，despltetherotationofthecylinderblock．

Fig．2．4 Neutral

②whentheswashplateanglecontrolleverisshiftedtotheleft，thecylinderblockturnsenough

PaSSbeyondthekidneyBtodrawoilintothepIStOnholes・Whenthecylinderblockturnstopass

beyondthekidneyA，Pre．SSureOilisdischargedfromthepIStOnholes・Whenthecylinderblo turnscontinuously，OilissuckedthroughportBleadingtothekidneys，beingdischargedthrough

POrtA．

③Thevolumeofoiltobesuckedanddischargeddependsuponthepistonstrokeorthetiltingangleo theswashplate・Thedischargevolumeofoilisreducedby reducingthetiltingangleofthesw Plateandisincreasedbyincreaslngthetiltingangle． r＝∵∴1Low−PreSSureOiJ swASHPLATEANGLECONTROLLEVER

Fig．2．5 PumpOperation（1） −26−

2，POWER TRAIN

④Astheswashplateanglecontrolleverisshiftedtotheright，theoilflowisreversed・（therotatio directionofthedriveshaftremainsthesame．）

TheoilissuckedthroughportAanddischargedthroughportB・

Fig．2．6 PumpOperation（2）

（2）OperationofHSTMotor

①Thehigh−PreSSureOilfromthepumpflowsthroughportAandkidneyAtoactonthepiston CylinderblockandpushesitagalnStthedriveshaft．

②Thedriveshaftthenrotatestogetherwiththepiston．Thelow−PreSSureOildischargedfrom PIStOnflowsthroughkidneyBandportB．

③Incontrast，Whenthehigh−PreSSureOilfromthepumpflowsthroughportBandkidneyB，thed

shaftrotatesinreverse． ④Astheinclinedshaft（driveshaft）angleObecomeslarger，thepistonstrokeincreasessothatthe

driveshaftspeedslows．Incontrast，aStheinclinedshaftangleObecomessmal1er，thedriveshaf SPeedincreases・

DRIVE SHAFT

Fig．2．7 MotorOperation

−27−

2．POWERTRAIN

2．l．2 HSTANDHSTCHARGECIRCU］T TheHSTandHSTchargecircuitconsistsprlmarilyofanHSTpump，HSTmotor，hydraulicoiltank HSTcharglngPumP，andHSTfilter・

TheHSTpumphasapumpcombinationvalvesland2andFNRsolenoidvalve・ TheHSTcharglngPumPdrawshydraulicoilfromthehydraulicoiltankandsendsit，PaSSlngthrough

theHSTfilter，tOthelow−PreSSureSideofthecircuitbetweentheHSTpumpandHSTmotor・

pressureoilisalsousedtocooltheHSTpumpandHSTmotor・Inaddition，thepressureoilfromthe

HSTcharglngPumPSerVeSalsoasthepowersourcefortilt−COntrOllingtheHSTpump・ ThepowerfromtheenglnedrivesHSTpumpdirectlyandthereforethepressureoilfromtheHST PumPrOtateStheHSTmotor・

TheoutputfromtheHSTmotoristransmittedintheorderoftheHi−Lotransmission，PrOPeller Shafts，aXles，andtires．

TheHSTcircuitisaclosedcircuitandworkswithacombinationofthevariableplungerpumpand

thevariableplungermotortochangethedisplacementvolumeinboththeHSTpumpandtheHST motor，thuschangetheHSTmotorspeedsteplessly・Inaddition，Whenthetravelingspeedisaccelerate

orsloweddownorwhentheacceleratorpedalisreleased，theHSTbrake（thepowerheldduringtra istransmittedintheorderoftheHSTmotor，HSTpump，andenginetoslowdowntheloader）c SmOOthlyapplied・

HST FLLTER

PROPELLER SHAFT

Fig．2．8 HSTCircuit −28−

2．POWER TRAIN

（1）Neutralcircuit

Whentheshiftleverisinneutral，theFNRsolenoidvalveiskeptintheneutralposition・Thepressur

OilfromtheHSTcharglngPumP・ FlowsthroughtheneutralcircuitoftheFNRsolenoidvalveandactsonthetwoservopIStOnSOfthe

HSTpump．SincethetwoservopIStOnSareSubjectedtotheoilpressureofthesamemagnitude，thetilt−

ro11ingpIStOnOftheHSTpumpwon，tmoveintoeithertheforwarddirectionorthereversedirectionso thatthepressureoilisnotdischargedfromtheHSTpump・Therefore，theHSTmotorwon

Fig．2．9 NeutralCircuit

−29−

trotat

2．POWER TRAIN

（2）ForwardTravelCircuit

Whentheshiftleverisputintheforwardposition，theFNRsolenoidvalvemovestotheleft・Th

pressureoildischarged丘omtheHSTcharglngPumPisbranchedbytheHSTpumplntOtWOflows：

flowsthroughthethrottleAandcircditPlo，throughtheFNRsolenoidvalve，andactsononeofth

SerVOPIStOnSOftheHSTpump・ TheotherflowofpressureoilfromthechargepumppassesthroughthecircuitPhiandFNRsolenoid ValveandactsontheotherservopIStOn． TheservopIStOnSfunctionduetoapressuredifferentialproducedbythethrottleAbetweenthe circuitPhiandthecircuitPlo．

ThemovementofeachservopIStOnVariesinproportiontothemagnitudeofthepressuredifferential betweenthecircuitPhiandthecircuitPlo．ThethrottleBservestowidenthepressuredifferential

betw？enthecircuitPhiandthecircuitPloinproportiontoenglnerPm・

ThepressureoildischargedfromtheHSTpumpflows，PaSSingthroughthecircuitA，tOth motortorotateit，thusmovlngtheloaderintheforwarddirection・

Whentheloadertravelsinreverse，theFNRsolenoidvalveisswitchedoverandthehigh−PreSSureOil inthecircuitPhienterstheservopIStOnOPPOSitetothatusedforforwardtravel・

TheHSTpumpswashplatetiltrollsinthedirectionoppositetothatforforwardtravelsothatthe pressureoilisdischargedfromtheportoppositetothatforforwardtravel，thusrotatlngtheHSTmotor lnI●eVerSe．

CIRCUIT Phi THROTTLE B

Fig．2．10 ForwardTravelCircuit

−30−

2．POWER TRAIN

2．1．3 HSTCONTROL TheHSTcontrolunitisanelectrictypeoperatedwiththeshiftleverinstalledonthesteerlngCOlumn・

Whentheshiftleverismoved，theFNRsolenoidvalveoftheHSTpumpISeXCitedtochangeover

thedischargedirectionsoftheHSTpumptodeterminethetravelingdirectionoftheloader・ 2

3

L〜1N′R ／て− ジ

アLO SM

／ゐFF ∠．．．．．・・・一−

丁し1lヽ＆HAZきRO：」A¶P）

1．SHIFTLEVER 2．NEUTRALLOCK 3．HAZARDSWITCH 4．TURNSIGNALSWITCHLEVER

▼／lLISト＝T（R［」ム．ゝ C〔−】L）

こトロく1∈LAY CD＿）

b＼二1エ⊃n 1⊂）′【ヽ＼＿．ノ R／￣ヽ） （⊃

（SERVESALSOASLIGHTINGSW） Fig．2．11ShiftLever −31−

2．POWER TRAIN

DirectionalcontroIcircuit

① Whentheparkingbrakeswitchisturnedoff（released），theelectriccurrentfromthe＃5fuseflows

PaSSingthroughtheparkingbrakeswitch，tOtheparkingbrakesolenoidvalvetooperateit．（Fort

OPerationoftheparkingbrake，referto

3．2PARKINGBRAKE．

）

②ThepressureoilfromthetransmiSioncharging／brakepumpflowsthroughtheparkingbrakesole ValvetotheparkingbrakecirculttOincreasethecircuitpressure，thusturnlngtheparkingbrake releasepressureswitchOFF．

③ AstheparkingbrakereleasepressureswitchisturnedOFF，theexcitationcircuitoftheFNRsolenoid

ValveearthrelaylSCutOffsothattheelectriccurrentfromthe＃8fusewon tflowtoth

SOlenoidvalveearthrelay．Therefore，theFNRsolenoidvalveearthrelayswitchcircuitisconnec

totheearth．

④ Whentheshiftleverisplacedintheforwardposition，theFNRswitchisswitchedoverto POSition． ⑤ Theelectriccurrentfromthe＃8fuseisbranchedintotwoflows：Oneflows，PaSSingthroughthe＃4

terminaloftheFNRswitch，tOtheFNRforwardrelaytoexciteit．Theotherflows，PaSSlngth

theFNRforwardrelayandFNRsolenoidvalve，tOtheFNRsolenoidvalveearthrelayswitc

SincetheFNRsolenoidvalveearthrelayswitchcircuitisconnectedtotheearth，thecircuitisthus COmPletedtomovetheFNRsolenoidvalvetotheforwardposition． ⑥ Therefore，theloadermovesforward．

⑦whentheshiftlever ．

infbrwardtravel． FNR SWITCH

LJ

r

PARKING BRAKE SOL VALVE

Hi−LoTRANSMISS10N

Fig．2．12 DirectionalControICircuit −32−

2．POWER TRAIN

2．2 HSTPUMP L13・3，LX70・7

Ll −3，LX＄0−7

Model

PV22−741

PV22−742

Type

Viable delivery piston

←

Driving

Directly connected toenglneCrankshaft

←

Discharge

Oto69．8cc／rev

←

38．7MPa（395kgf／cm2）

39．2MPa（400kgf／cm2）

Max．workingpressure （Reliefvalvepressure）

［5618psi］

［5689psi］

39．2MPa（400kgf／cm2）

←

［Pressuredifferential］

［5689psi］

Control

Automotive regulator control

←

Ⅵねight

93k■g［2051bs］

←

Geartype

←

HST charging pump

Note：ForthespecificationsoftheHSTcharglngPumP，refertoH6・2PUMP・

〇 （つ

▲ ⊂＼ 0

0

⊂＼ くつ

つ

つ

」＿＿＿＿＿＿＿＿＿▼▼＿

Note：B＞6：＝＝コ225N−m（23kgf−m）［1661bf−ft］ 医＞6：：：：：：：コ50N−m（5kgf−m）［361bf−ft］

B＞（芯：＝コ137N−m（14kgf−m）［1011bf−ft］ 1．HSTPUMP 2．FLYWHEELCOVER

4．PLUG 5．＝0 −RING

7．BOIJ 8．COUPLING

3．SOCKETBOLr

6．HUB

9．（HSTCHARGINGPUMP）

Fig．2．13 HSTPump −33−

2．POWER TRAIN

2．2．1GENERAL DESCRIPTION

TheHSTpumpISaSWaShplatetype，Variabledeliveryplungerpumpwhichtilt−rOllsinbothdirections

TheHSTpumpisequippedwithtwopumpcombinationvalves（1and2）andFNRsolenoidvalve・

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

Thepumpcombinationvalvelconsistsofaregulator，inchingvalve，Cut−0ffvalve，Pumptilt−rOl

SPeedcontroIvalve，andFNRsolenoidvalve・ Thepumpcombinationvalve2consistsofashuttlevalve，reliefvalve（forforwardtravel），andrel Valve（forreversetravel）．

ThepowerledfromtheenglneistransmitteddirectlytotheHSTpumpshaft・Therotationo HSTpumpshaftisthentransmittedthroughthecouplingtothetriplegearpump・

CYL．BLOCK

PLUNGER

SHOE PLATE SWASH PLATE

SHAFT

SectionalviewX−X

Fig．2．14 HSTPump（1） −34−

2．POWERTRAIN

（HSTPUMP） 10

11

くコB

SectionalviewC−C F「ont

Rea「

Note：Thenumbersinthefigurecorrespondto

thoseofthepartsnameshownonPage36・ View100kingfromB

13

12

2．POWERTRAIN

lNCHING PEDAL

to HST MOTOR

to HST MOTOR

17

18

16

1．PUMPCOMBINATION VALVE1

6．FNRSOLENOIDVALVE

2．CUT−OFFVALVE 3．fromMAINSTEERING

CONTROLVALVE 8．REGULATOR 9．fromCHARGINGPUMP

CIRCUIT 4．PUMPSELF−DISCHARGE PRESSURE PORT （fromPUMP COMBINATIONVALVE2） 5．INCHINGVALVE

15 12．RELIEFVALVE（FORREV

TRAVEL）

7．PUMPTILT−ROLLINGSPEED

13．RELIEFVALVE（FORFWD

PRESSUREPORT

TRAVEL） 14．PORTB 15．PORTA 16．CHARGERELIEFVALVE

（toCOMBINATIONVALVEl）

17．DRAINPORT（toHST

lO．PUMPSELF−DISCHARGE

1l．PUMPCOMBINATION VALVE2

MOTOR） 18．SHUTTLEVALVE

Fig．2．16 HSTPump（CircuitDiagram） −36−

2．POWER TRAIN

（PUMPCOMBINATIONVALVEl）

SectionalviewA−A

Note：Thenumbersin the figure COrreSPOndtothoseofthe

PartnameShownonpage36・

Sectionalview B−B

Fig．2．17 HSTPump（3） −37−

2．POWER TRAIN

（PUMPCOMBINATIONVAINE2）

Sectionalview A−A

Sectionalview B−B

Note：Thenumbersinthefigurecorrespondtothoseofthepartsnameshownonpage36・ Fig．2．18 HSTPump（4）

−38−

2．POVVER TRAIN

Operation

Thecylinderblockissplinedtotheshaft・Insidethecylinderblockisaplungerinserted・

ThepowerfromtheenglneistransmitteddirectlytotheshaftoftheHSTpump・Astheshaftrotat

Plungerrotatestogetherwiththecylinderblock・ TheplungerslidesovertheshoeplateandmakesrecIPrOCatlngmOtionsinsidetheboreinthecylinder

blockaccordingtothetiltoftheswashplate，thusdrawlngOrdischarglngthehydraulicoil．Wh

dischargeportAorBistobeusedisdeterminedbytilt−rOllingcontroloftheswashplate・ Note：Thetravelingdirection（forwardorreverse）oftheloaderisdeterminedbywhichport（AorB） OftheHSTmotorthepressureoilenters，fo1lowlngtheswitchingoverofthedischargeportsof

the HST pump.

Pump discharge control Thepumpdischargeiscontrolledbytheplunger StrOkevarylngWithchanglngtilt−rO11ingangleofthe

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

rollinganglevarie畠withthemovementofeachservo piston・

Fig．2．19

−39−

2．POWERTRAIN

2．2．2 PUMP CONTROL

TheHSTpumpISCOntrOlledbyacombinationofenglnerPm，PumPCOmbinationvalvesland2

Thepumpcombinationvalvelconsistsprlmarilyoftheregulator，inchingvalve，Cut−0ffvalve，a PumPtilt−rOllingspeedcontroIvalve・

Thepumpcombiムationvalve2consistsprimarilyoftheshuttleandtworeliefvalves（forfwda rev）．

Thepumpcombinationvalvelhasthefollowlngfunctions：

・Automotivecontrolbyregulator（PumPtilt−rOllingcontroIperformedinproportiontoenginerpm） ・Controlbytheinchingvalve ・Controlbythecut−0ffvalve

・Controlbythepumptilt−rOllingspeedcontroIvalve

−40−

2．POWER TRAIN

（1）Automotivecontrolbytheregulator（pumptilt・rOllingcontroIperformedinproportion enginerpm） TheHSTmotorspeediscontrolledbychanglngtheHSTpumptilt−rOllingmotioninproportionto

englnerPm・

Operation

① ThepressureoilfromtheHSTchargingpumpis branchedintotwoflows：Oneflows，PaSSing

throughthethrottleAtothecircuitPloandthe otherflowstothereliefvalveA．

② Astheenginespeedincreases，thedischargefrom theHSTcharglngPumPalsoincreases．However，

becauseofthethrottleA，thedischargepressure

（A）fromtheHSTpumprisestoactuatetherelief ValveAsothatthepressureoilflowstothecircuit Phi． Thepressureofthepressureoilflowlngthrough

the throttle A to the circuit Plo becomes lower thanthatofthepressureoilflowlngthroughthe

reliefvalveAtothecircuitPhiduetothethrottle A，CauSingapressuredifferentialbetweenthe CircuitsPhiandPlo．

③ Sincethechargereliefvalveopensatapressure

Fig．2．20

Ofl．47MPa（15kgf／cm2）【213．3psi］，thepressureoilatthecircuitPlodoesnotchangesomuc eveniftheenglneSPeedchanges．ThrottlesAandBareprovidedtowidenthepressuredifferential

betweenthecircuitsPhiandPlo， WhentheenglneSPeedisatlowtomediumspeed，thepressuredifferentialbetweenthecircuitsPhi

andPlobecomesequaltothatacrossthethrottleB．AstheenglneSPeedincreasesfurther，th

dischargefromtheHSTcharglngPumPalsoincreasessothattheflowofthepressureoilinthe

CircuitPhiisrestrictedbythethrottleB，thuscauslngltSPreSSuretOincrease．Whentheoilpres

inthecircuitPhiincreasesenoughtoreachthepressuresettlngOfthereliefvalveB，thereliefvalve BopenstopreventthepressuredifferentialbetweenthecircuitsPhiandPlofromrislngfurther．

④ EachofthetwoservopistonshasaspringwhichkeepstheswashplateoftheHSTpump

neutralposition．Whentheshiftleverismovedfromtheneutralposition，theFNRsolenoidvalveis

SWitchedoversothatthepressuredifferentialbetweenthecircuitsPhiandPloactsonthetwo SerVOPIStOnSaSatilt−rOllingcontroIpressureoftheHSTpump．

⑤ Whenthepumptilt−rOllingcontroIpressureinthecircuitPhi（highpressure）overcomes坤eforce OfthesprlnglnSidetheservopIStOnattheopposite，theswashplatetilt−rOlls．

⑥ Astheenginespeedincreases，thepressuredifferentialbetweenthecircuitsPhiandPloalsoincrea tomaketheservopIStOnSmOVelarger，thusincreaslngthepump

stilt−rOllingamount．

AstheenglneSPeedreduces，thepressuredifferentialbetweenthecircuitsPhiandPlobecomes

SmallerandthusthemovementoftheservopIStOnSalsobecomessmallertoreducethepump sti rollingamount．

−41−

2．POVVER TRAIN

Note：TheregulatorconsistsofthrottlesAand B，andreliefvalvesAandB．

Fig．2．21Enginerunnlngatlowrpm

C［RCUIT Plo

RELIEF VALVE THROTTLE B

FNR SOL J VALVE CIRCUIT Phi

THROTTLE A

RELJEF VALVE A

SERVO PISTON SERVO PISTON

Al

SWASH PLATE

Fig．2．22 Enginerunnlngathighrpm

−42−

2．POWERTRAIN

⑦ Thepump storqueiscontrolledatavalueslightly higherthantheratedtorqueoftheenglnebythe

Pump displacement VOIume（Cm3／rev）

returnmomentmechanism（Seebelow）oftheHST PumP・

nputtorque

⑧ Whenaloadgreaterthantheenginetorqueacts OntheHSTpump，theenglneSPeedslightlydrops・

Since the regulatorcontroIs the tilt−rOlling OPerationofthepumplnPrOPOrtiontotheenglne

＼ 一●−Engine smaxtorque 「二＝＝定＝

rEnginera

SPeed，theregulatorquicklyreducesthetilt−rOlling

HSTcircuitpressure

Ofthepumptomatchthepump slnPuttOrquetO the engine

（Pa）

s rated torque（because a better

Fig．2．23 OPeratlngfeelisobtainedbycontrollingthetilt− rollingoperationofthepumpwhentheenginespeeddropsslightly）・

⑨ Whentheloadonthemainsteeringpumpincreasesenoughtomaketheenginetorquei overloadedstate，theenglneSPeeddrops・But，aStheenglneSPeeddrops，thetilt−rOllingoperation

oftheHSTpumpISreducedbytheregulatorsothattheHSTpump，slnPuttOrquebecomessmaller WhenthesumoftheHSTpump，slnPuttOrqueandthemainsteerlngPumP，slnPuttOrquematChes theengineratedtorque，theenginespeedstopsdroppingtopreventtheenginefromstalling（duet theanti−Stallfunction）． SWASH PLATE PLUNGER

Returnmomentmechanism

VALVE PLATE

① Thepressureoilisdeliveredthroughthevalve platetotheplungerinareas

αandβwitha

conditionofα＜β．

② whenaloadisappliedontheHSTmotor，theoil PreSSureinthecircuitleadingfromtheHSTpump totheHSTmotorrisestoactontheinsideofthe

PlungeroftheHSTpump・ ③ Sincethereisadifferencebetweentheareaαand areaβatthehigh−PreSSureSideportofthevalve HIGHrPRESSURE

Plate，thepressureoftheoilwhichactsonthe

plungerthroughtheareaβisgreaterthanthe PreSSureOftheoilwhichactsontheplunger

through the areaα・The force ofthe area differential（β−α）xcircuitpressurepushesthe

bottomoftheswashplateasamomentuslngthe CenterOfthetilt−rOllingasanaxis，thusmoving

theswashplatetotheneutraldirection（return moment）．

④ Themovement（angle）ofthe swashplateis PrOPOrtionaltothepressureoftheHSTcircuit

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

Fig．2．24 −43−

2，POWERTRAIN

（2）Controlbyinchingvalve

Changlngthepedaleffortontheinchingbrakepedal WillrestrictthedischargeoftheHSTpumpandthus

COntrOltheHSTmotorspeed． Operation

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

Forward travel

① Thepumptilt−rO11ingcontroIpressureinthe CircuitPhiisconnectedthroughtheFNRsolenoid Valvetothecircuit，Whilethepumptilt−rOlling

COntrOIpressureinthecircuitPloisconnectedto

Fig．2．25

thecircuitA．

② Theinchingvalveislocatedbetweenthepumptilt−rOllingcontroIpressurecircuitsAandB・

theinchingvalveoperates，thepumptilt−rOllingcontroIpressuresofthecircuitsAandBmerge・

③ Theopeningoftheinchingvalvevariesinproportiontotheinchingbrakepedaleffort（StrOke）・ Whentheinchingbrakepedalstrokebecomesgreater，thepressuredifferentialbetweenthepump

tilt−rOllingcontroIpressuresofthecircuitsAandBbecomessmaller・

④ Astheinchingbrakepedalispressed・thepressヮredifferentialbetweenthepumptilt−rOllingcontroI PreSSureSOfthecircuitsAandBbecomessma11er，SOthatthetilt−rO11ingamountoftheswashplate

OftheHSTpumpreducestodecreasethedischargeoftheHSTpump・Thisinturnreducesthe

motorspeedtoreducethetravelingspeedoftheloaderinforwardgear・Inotherwords，yOuCa

alsocontrolthetravelingspeedoftheloaderuslngtheinchingbrakepedal・

⑤ SinceyoucancontroltheHSTpump sdischargeusingtheinchingbrakepedalwithoutchanging theenglnerPm，itmeansthatyoucanrestrictthetravelingspeedoftheloaderwithoutreducingthe

Fig．2．26 Controlbyinchingvalve −44−

2．POWERTRAIN

（3）Controlbycut・Offvalve

TheHSTpump，stilt−rOllinglSCOntrOlledaccordingtothesumofthetravelingpressureandm

CircuitpressuretoreducethemaximumpressureoftheHSTcircuit，thuskeeplngthebalancebetween

thetravelingforceandbucketbreakoutforce・ IndigglngWOrk，itisimportanttomatchtheliftforceoftheloadhandlingunittothetravelingpower

Indigging，adownwardforce（R）actsontheboomsoftheloadhandlingunitduetothetravelingp

（FK）．Ifthetravelingpower（FK）isgreaterthannecessarywhenliftingthebucket，thedownwardf （R）actingontheboomsbecomesgreater，thusleadingtoaninsufficientbucketliftingforce（FL）・

Ifthetravelingpower（FK）istoogreat，thetireswillskidtocausethemtowearaswellastoroughen

thegroundsurface，makingthe POWer）intheHSTcircuitisreducedininverseproportiontothemaincircuitpressuretoachievingthe

matchingbetweentheliftforceandtravelingpower・ Operation

① ThesumofthetravelingpressureintheHSTcircuitandthemaincircuitpressureactsonthecut 0仔valve．

② Asthepressureactingonthecut−0ffvalvepinbecomesgreaterthanthesetting，thepressur

movesthespooltothelefttoconnectthecircuitsAandB・ ③ Thepressuredifferentialinpumptilt−rOllingcontroIpressurebetweenthecircuitsAandBbecome

SmalleraccordingtothemovementofthespoolandthusHSTpump stilt−rOllingamoun

becomessmallertoreducethemaximumdischargepressureoftheHSTpump．IndigglngWO

themaximumpressureoftheHSTpumpISreducedbythecut−0ffvalvetopreventthereliefvalve fromoperatlng・

Inaddition，SincethetiltLrOllingamountoftheHSTpumpreduces，theloadtotheenglnefro

HSTpumpISalleviated・TheexcesspoweroftheenglnePrOducedbythisalleviationcanbeused forthepowerdrivingthemain／steerlngPumP・ ④ Thecut−0ffvalveoperatesonthelinep−PObtainedbyconnectingthemaincircuitpressureandthe HSTcircuitpressure．Therefore，thepressureoftheHSTcircuitisdeterminedbythemaincircuit

PreSSuretOCOntrOltheoutputtorque（travelingpower）oftheHSTmotor・ Sincetheforwardtravelingpressureproducedwhenthecut−0ffvalveoperatesislowerthanthe

reliefvalvepressureintheHSTcircuit（betweentheHSTpumpandHSTmotor）tthereliefvalv theHSTcircuitisdesignednottooperatetoproduceagoodheatbalance・

Fig．2．27 DigglngWOrk

Fig．2．28

2．POWER TRA（N

CUT−OFF VALVE

CIRCUIT A

CUT−OFFVALVE

CIRCUITA CIRCUITB

MAIN CIRCUIT PRESS

／

SPOOL

Fig．2．29 ControlbyCut−OffValve

−46−

2．POWERTRAIN

（4）Controlbypumptilt・rOllingspeedcontroIvalve

Thepumptilt−rO11ingspeedcontroIvalvealleviatesarapidtilt−rOllingoperationofthep

achievesmoothaccelerationoftheloader．Inaddition，1tPreVentStheoccurrenceofcavitationinthe

SerVOPIStOnCircuit． Operation

① Thepumptilt−rOllingspeedcontroIvalveconsistsofathrottleandacheckvalveandislocat

betweenthecircuitsPlo（A）and（B）（PumPtilt−rOllingcontrollow−PreSSureCircuit：thecircuiti

Whichthepressureoilisreturnedbythelow−PreSSureSideservopIStOrlWhenthepumptilt−rOllin COntrOlhigh−preSSureSideservopistonoperates）．

② whenthecheckvalveisclosed，thereturnoilfromthecircuitPlo（A）flows，PaSSingthrou

throttletothecircuitPlo（B）・Sincetheflowofthereturnoilfromtheservopistonisrestricted

thethrottle，thetilt−rOllingoftheHSTpumpchangessmoothlysothatthepumpdischargeal increasessmoothlyandthusacceleratestheHSTmotorspeedinasmoothmanner（thatis，the

loader

stravelingspeedissmoothlyaccelerated）・

③Iftheloadincreasesrapidlysuchaswhentheloaderhitsanobstacle，thetilt−rO11ingofthe

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

higherthanthatinthecircuitPlo（A），thepressureoilinthecircuitPlo（B）opensthecheckval andflowstothecircuitPlo（A）tocompensatefortheinsufficiencyofoilthere（make−uPOPeration）．

ー47−

2．POWER TRAIN

CHECK VALVE 旧hi

什 U C

C］RCUIT P10（A）

CP

THROTTLE CIRCUIT P10（B）

SERVO PISTON

Fig．2．30 WhenOilFlowsthroughThrottle

CHECK VALVE CIRCUIT P10（A）

CIRCU汀 P10（B）

Fig．2．31WhenOilFlowsthroughCheckValve

ー48−

2．POVVER TRA［N

2．2．3 FNR SOLENOLD VALVE

TheFNRsolenoidvalveswitchesoverthedirectionsofpumptilt−rOllingcontroIpressureinthe circuitPhi．

Note：TheoperationoftheFNRsolenoidvalveisexplaineduslngtheoperationperformedwhenthe Shiftleverisplacedintheforwardposition，aSaneXamPle・

Operation ① Whentheshiftleverisinneutral，theFNRsolenoidvalvealsoremainsinneutral・Thepumptilt−

rollingcontroIpressureinthecircuitPhi（highpressure）flowsthroughtheportPintheF

solenoidvalvebutdoesnotflowintotheportAorportBbecauseitisblockedbythespool，．SOthat itdoesnotactontheservopiston．Thepumptilt−rOllingpressureinthecircuitPlo（lowpressur actsonbothservopIStOnSSOthattheywon，tmove，thuskeeplngtheswashplateoftheHSTpum inneutral．

② whentheshiftleverisputintheforwardposition，theFNRsolenoidvalvespoolmovestothele

thusconnectlngtheportPtotheportBandtheportTtotheportA・

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

④ Thepumptilt−rOllingcontroIpressurereturningfromtheservopistonenterstheportAofth SOlenoidvalve，PaSSingthroughthespoolandportT，tOthecircuitPlo（lowpressure）・

⑤ TheservopistonmovesandtheHSTpumpswashplatetilt−rOllsintheforwarddirection pressureoildischargedfromtheHSTpumprotatestheHSTmotor，thusmovingtheloaderin forward．

−49−

2．POWER TRAIN

PORT A

PORT B

PISTON

Fig．2．32InNeutral

PORT A

PORT B

FNR SOL VALVE

PORT P PORT T

SPOOL

Fig．2．33InForwardTravel −50−

PORTB PORTA

（FWD）（REV）

2．POWERTRAIN

2．3 HST MOTOR

Model

L13−3，LX70・7

Ll ・3，LX＄0−7

A6VM80HA

A6VM 107HAA

VariabledeliverypIStOnmOtOr

「吋pe

←

（inclinedshafttype） Discharge（SuCtion） Control

33．7to80．Occ／rev

38．5tolO7．Occ／rev

【0．00890toO．0211gal／rev］

［0．01017toO．0283gal／rev］

HA（high−PreSSuredependent，

←

COnStantPreSSureCOntrOl） 36kg［79・41bs】

Ⅵねight

Note：D＞紹＝ゝMatingsurfaces：LOCTITE＃51270r515 B＞ぢ＝コ91N−m（9・3kgf−m）［631bf−ft］forL13−3，LX70−7， 230N−m（23kgf−m）［1661bf−ft］forL16−3，LX80r7 1．HSTMOTOR 2．（TRANSMISSION）

Fig．2．34 HSTMotor

一51−

49kg［1081bs］

2．POWER TRAIN

2，3．1GENERAL DESCR］PT］ON

TheHSTmotorisaninclinedshafttypevariabledeliverypIStOnmOtOrCOnSistlngOfacylinder block，regulator，COntrOIvalve，flush／boostvalve，andmotortilt−rOllingspeedcontroIvalve・

（Circuitdiagram）

8 7

10

9

8

6

5 4

1．PORTB

5．PORTTl（fromHSTPUMP）

2．FLUSH／BOOSTVALVE 3．MOTORTIIJ−ROLLING

6．PILOTPISTON 7．DIRECTIONCONTROL SOLENOID VALVE 8．CHECKVALVE

SPEEDCONTROLVALVE 4．PORTT2（toHYDRAULIC

OILTANK） Fig．2．35 HSTMotor（1） −52−

9．FLUSHVALVE lO．BOOSTVALVE ll．PORTA

2．POVVER TRAIN

（HSTmotor）

View100kingfromA

Fig．2．36 HSTMotor（2） −53−

2．POWER TRAIN

（Regulator；COntrOIvalve，andflush／boostvalve）

Note：The numbersin the figures COrreSPOndtothoseinpage52．

トA

Fig．2．37 HSTMotor（3） −54一

2．POWER TRAIN

（Flush／boostvalve）

Note：Thenumbersinthefigurescorrespondtothoseinpage52・ Fig．2．38 HSTMotor（4）

−55−

2．POWER TRAIN

Operation Theoutputshaftofthecylinderblockissupported OnthemotorcaslngbytwobearlngSandisconnected tothecenterholeofthecylinderblockthroughthe

CenterPin・ThecylinderblockhasacontroIplateon itsfrontend．Thecylinderblockisinclosecontact WiththecontroIplatewithasprlng・

Fig．2．39

Thecylinderblockhassevenplungersinsideit・The PreSSureOilfromthepumpflows，PaSSlngthroughthe POrtBofthecontroIplate，intothecylinderblock・

Whentheplungersarepressedbythepressureoil，the

OutPutShaftisrotatedbythecomponentofforce（FV） Oftheforce（F）pressingtheplungers：

Astheoutputshaftrotates，thecylinderblockalso rotates・TheplungersreachtheportAinturns，theoil returnstothehydraulicoiltank・Thedirectionoftravel

oftheloaderisdeterminedbywhichportAorBthe PreSSureOilflowsinto・

Fig．2．40

−56一

2．POWER TRAIN

2．3．2 REGULATOR

（1）Whenthemotorrotatesathighspeed Whentheoperatingpressureofthemotorislessthan24・OMPa［245kgf／cm2］†3485psi）（forL13−3，

LX70＿，）。，25．7MPa［262kgf／cm2］（3726psi）（forL16−3，LX80−7），theoperatingpressur占isovercome bythesprlngforceandthusthepilotpIStOnispressedupwardbythesprlngforcetoblockoffthe

communicationbetweentheportsAandB・TheportBisconnectedtothedraincircuit・TheportDi alsoconnectedtotheinternalpassageandtothedraincircuit・

TheportAisconnectedtotheportConwhichthemotoroperatlngPreSSureisalwaysactlngSOthat servopIStOnmOVeSdowntoshiftthecontrolrodwhichinturnmovesboththecontroIplateandthe

cylinderblock，thusputtlngthemotorintheminimumtilt−rO11ingposition・Theplungerstrokebeco

minimaltoallowthemotortorotateatahighspeed・

Fig・2・41WhenMotorRotatesatHighSpeed −57−

2．POWERTRAIN

（2）Whenthemotorratitesatlowspeed

Whentheoperatingpressureofthemotorishigherthan25・OMPa［255kgf／cm2］（3627psi）（

L13−3，LX70＿7）or26．7MPa［272kgf／cm2］‡3869psi）（forL16−3，LX80−7），theoperatingpressure overcomesthesprlngforceandpushesdownthepilotpIStOnagalnStthesprlngtenSiontoallowthe

portsAandBtoconnecttoeachother・TheoperatlngOilthusflows，PaSSlngthroughtheportsAan adinternalpassage，tOtheportsCandD・TheservopIStOnmOVeSuPWardduetothedifferenceinar betweentheareasEandF．ThecontrolrodconnectedtotheservopIStOnShiftsboththecont andthecylinderblocktoputthemotorinthemaximumtilt−rOllingpositionsothatthemotorrotatesat lowspeed・

PILOT PISTON

CONTROL PLATE L13−3，LX70−7：24．0 」16−3，LX80−7：25．7

25．0 26．7

26．0 27．7

CONTROL ROD SERVO PISTON

AREA E

CYLINDER BLOCK PLUNGER

F＞E

AREA F

PORT D

Fig・2・42 WhenMotorRotatesatLowSpeed −58一

2，POWER TRAIN

2．3．3 DIRECT10N CONTROLSOLENOLD VALVE

TheHSTmotorregdlatorisoperatedbythepressureoiloftheHSTmotor．ThedirectioncontroI SOlenoidvalveturnsonwhentheFNRleverisplacedintheFpositionandoffwhentheleverisplaced

intheRposition・Therefore，thedirectioncontroIsolenoidvalvesendstheforwardoilpressuretoth

regulatorwhenthedirectioncontrolisplacedintheforwardpositionorinneutral，andsendsthereverse

traveloilpressuretotheregulatorwhenthedirectioncontrolisplacedinthereverseposition・

ThefollowlngeXPlanationismadeuslngtheoperationinforwardtravelasanexample・

Themotoroperatingpressureoil（highpressure）dischargedfromtheHSTpumpenterstheport

flowsthroughthecheckvalveandactsonthedirectioncontroIsolenoidvalve・Sincethedirecti

COntrOIvalveisinOFF，thepressureoilattheportAoftheforwardtravelsideissenttotheregulator． 2．3．4 FLUSHANDBOOSTVALVES

TheflushvalvereceivesboththehighandlowpressureoilfromtheHSTcircuit（betweentheHST

PumPandHSTmotor）andletsthelowpressure−Sideoilflowtotheboostvalve，Whichinturnesca

ittothedraincircuittochangetheoilintheHSTcircuit・

Thefollowingexplanationismadeuslngtheoperationinforwardtravelasanexample・

TheHSTpumpsehdsthehighpressureoilintotheHSTmotortodriveit・Themotoroperatln

PreSSureOil（highpressure）dischargedfromtheHSTpumpenterstheportA，flowsthroughthef

ValvespoolandactsonthechamberD・Themotoroperatingpressureoil（lowpressure）returnin theHSTmotorenterstheportC，flowsthroughtheflushvalvespoolandactsonthechamberE・

ThepressureinthechamberDwherethehighpressureoilactsishigherthanthepressureinthe

ChamberE．Therefore，thepressureoilmovestheflushvalvespooltotherightagalnStthesprln inthechamberE．Theoperatingpressureoil（lowerpressure）whichhasenteredtheportBpasse

throughtheboostvalvethrottleandflowsintothedraincircuit・Thisthrottlelimitstheflowofoiltot

drainporttokeeptheoilpressure（lowpressure）inthecircuitbetweentheHSTmotorand PumP・

ー59−

2．POWER TRAIN

FLUSH VALVE SPOOL

Fig・2・43 DirectionControIValve，FlushValve／BoostValve −60−

2．POWERTRAIN

2．3．5 MOTORTILT−ROLLING SPEED CONTROLVALVE

Themotortilt−rOllingspeedcontroIvalveconsistsofathrottleandacheckvalveandislocatedinthe internalpassagebetweentheportDandthepilotpIStOnOftheregulatortorestricttheflowofthe

hydraulicoilenterlngtheportD，thuscontrollingthetilt−rOllingspeedoftheHSTmotorswashplate preventthetravelingspeedfromslowlngraPidly・

（1）Changefromlowtohighspeed

① Whentheservopistonsmovedown，thehydraulicoilflowsoutoftheportDtopushthethrottle

theleft，Whichinturncomesincontactwiththeguidelwhilemakingagapbetweenthethrottle andguide2．

② Thehydraulicoil丘omtheportDflows，PaSSingthroughthegapbetweenthethrottleandtheg 2，intotheholeinthethrottleandthenpassesthroughtheinsidethethrottletothepilotpIStOnSi

SincelthehydraulicoilflowstothepilotpIStOnWithoutbeingrestrictedsomuch，thusthemotor

SPeedchangesfromlowtohighspeedquickly・

（2）Changefromhightolowspeed ① Whentheservopistonsmoveupward（towardthesmalトdiameterchamber），thehydraulicoilflows

fromthepilotpIStOnSideandpassesthroughtheguideltopushthethrottletotheright，Whichin

turncomesincontactwithguide・2；thatis，nOgaPISPrOducedbetweenthethrottleandtheguide2 ② Thehydraulicoilfromthe．pilotpistonenterstheholeinthethrottleandflowspassingthroughthe insideandnotchofthethrottle，intheportD・Sincetheflowofthehydraulicoi11eadingtothepor

Disthusrestrictedsothatthemotorspeedchangesfromhightolowslowly・ （1）Whenchangingfrom10WSPeedtohighspeed OPeration

SERVO PISTON

−一章章一毒←

GUIDEI THROITLE GUIDE2

（2）Whenchangingfromhighspeedto10WSPeed ope ration

→甲￣ヂサ

GUFDEI THROmE GUIDE2

PORT D

Fig・2・44 MotorTilt−Ro11ingSpeedControIValve −61t

2．POWER TRAIN

2，4 TRANSMISS10N L13・3，LX70・7

L捕・3，LX80−7

Model

TCM619−34

TCM639−34

Type

Constant−meSh，SPurgeartyPe

←

Speeds

←

Clutch

Type Operation Pressure setting

Multiple−diskwettype

←

Hydraulic

←

1．47tol．76MPa（15．Oto18．Okgf／cm2）

←

［213．2to256psi］

Oil capacity

6．5to7．5L

←

【1．71tol．98U．S．gal．］

Weight

160kg［3531bs】

151kg［3331bs］

ThetransmissioncontroIstheoutputoftheHSTmotorandsendsitthroughthepropellershaftsto thefrontandrearaxles．

ThetransmissionconsistsofanlnPutShaft，tWOClutches，fourgears，anOutPutShaft，aParkingbrake・

Note：B＞ぢ：：：：コ176to225N−m（18to23kgf−m）［130to1661bf−ft］ 1．TRANSMISSION 2．（HSTMOTOR） 3．（REARFRAME）

4．MOUNTBRACKET −＼＼

2

3

Fig．2．45 Transmission

−62−

2．POWER TRAIN

1．PLUG 2．PLUG 3．PLUG 4．CHOKE 5．BREATHER 6．SPEEDSENSOR 7．CONTROLVALVE 8．OILLEVELDIPSTICK 9．PIPE lO．SUCTIONTUBE ll．STRAINER 12．PLUG

りりり臣りりりり監

臣匪匪匪臣匪臣防除匪

e t O N

25．4±3．9N−m（3．0±0．4kgf−m）［21・7±2・91bf−ft］ 9．8±2．ON−m（1．0±0．2kgf−m）［7．2±1・41bf−ft］ 15to20N−m（1．5to2．Okgf−m）［10．8to14・51bf−ft］

10．6N−m（1．08kgトm）［7．81bf一円 14．7±2．ON−m（1．5±O1．2kgf−m）［10．8±1・41bf−ft］ 52．1N−m（5．32kgf−m）【37．81bf−ft］ 26．1N−m（2．66kgf−m）［19．21bf一明 18．8N−m（1．92kgf−m）［13・91bf−ft］ 58to74N−m（5．9to7．5kgf−m）【42．7to54・21bf−ft］

Threadedarea：LOCTITE＃572

臣＞祀＝ゝThreadedarea：DegreaseandthenapplyLOCTITE＃271 匝＞OnL13−30rLX70−7，installthespeedsensordirectlywithoutusingshims・ OnL16−30rLX80−7，installthespeedsensoruslngtWOShims・ Fig．2．46 Transmission（1） −63−

2．POWER TRAIN

闇 Detai10farea K

Cold surface

Hotsurface

（Oiltemperatureis （Oiltemperatureishigher 10Werthan−5OC［23OF］．） than−5OC【230F］・）

SectionalviewX−X

Detai10f oildi

1 2

臣臣り監

臣匪臣防除 e t

O N

69to78N−m（7to8kgf−m）［51to581bf−ft］ 9．8±2．ON−m（1．0±0．2kgf−m）［7・2±1・41bf−ft］ 10．8N−m（1．1kgf−m）［8．01bf−ft］ 52．1N−m（5．32kgf−m）［38・51bf−ft］

Threadedarea：LOCTITE＃572 A．Highclutchoilpressurecheckport B．Lowclutchoilpressurecheckport C．Lubricationoilpressurecheckport D．Hydraulicoilpressuresensorcheckport Fig．2．47 Transmission（2） 一64t

1．COVER 2．CASE 3．VALVEPISTON 4．SPRING 5．SPRING 6．PLUG 7．PLUG 8．PLUG 9．SOLENOIDVALVE

2．POWER TRAIN

1．SLEEVE 2．CLUTCHASSEMBLY 3．COVER 4．DRIVENGEAR 5．HOUSING 6．ENDPLATE 7．PISTON 8．CAP 9．FLANGE lO．0ILSEAL ll．SPRING 12：DISKHUB 13．DISK，OUTER

14．DISK 15．OILBAFFLE 16．SHAFT 17．DRIVENGEAR 18．SEALRETAINER 19．0ILSEAL 20．FLANGE

Note：B＞6：＝：：コ52・1N−m（5・32kgf−m）［38・51bf−ft］

巨＞ぢ＝コ18・8N−m（1・9kgf−m）［13・71bf−ft］

匡＞ぢ：：：＝コ225・5N−m（23・Okgf−m）［166・41bf−ft］，14＝ゝThreadedarea‥LOCTITE＃262 B＞Shimadjustmentprocedure：

MeasurethestepXbetweenflangeandshaftwithoutshims・ SelectshimssothatthestepXisX二B：？i品82慧j］andinstall（CreateagaP）・ B＞l⊂＝恥Filll／3to2／30fthespacebetweenlipsattheinnerperiphery・ 紹＝ゝOuterperiphery：LOCTITE＃262

Note：Applyathincoatofgreasetopreventbreakagewheninsta11ingthe＝0 Fig．2．48 Transmission（3）

−65−

−ring・

2．POWER TRAIN

2．4，1CLUTCH SHAFT

TheClutchshaftassemblyhasclutchpacksforeachspeedrangewhichconnectanddisconnectthe POWertranSmissionline・ ／ 一−h−−、 ／

＼

「¶ヨ「7 ㌧ノ／ノ

Detail of area A

Detai10farea B

Note：B＞〆＝＝恥Slidingsurfaces：Grease l．PLUG 2．SHAFT＆DRUMASSEMBLY 3．GEAR（Hi）

4．PLATE 5．DISK

6．PISTON

1l．SPRING

7．SEALRING 8．SEALRING 9．STEELBALL lO．ENDPLATE

12．GEAR（Lo）

13．SEALRING 14．PLUG

Note：TheabovesketchshowstheclutchshaftfortheL13−3，LX70−7．Thestructureoftheclutchshaft mountedontheL16−3，LX80−7isthesame． Fig．2．49 ClutchShaft

−66−

2．POWERTRAIN

Operation

TheclutchisoperatedbypressureoilfromthetransmissioncontroIvalve・Thepressureoilfr controIvalveflowstothebackoftheclutchpistontomovetheclutchpistontotheright・Theclut pIStOnthenlocksuptheclutchdisksandclutchplates，thusunltlngtheclutchshaft＆drumasse withtheclutchhubtotransmitthepower・

⊂ニコPressureoil l．SHAFT＆DRUM

ASSEMBI＿Y 2．CLUTCHPISTON 3．CLUTCHDISK 4．CLUTCHPLATE 5．CLUTCHHUB

Fig．2．50 ClutchinEngagement

WithnopressureoildeliveredfromthecontroIvalve，theoilinthepIStOnisdischargedthroughthe bleedvalvesothattheclutchpistonispushedbackbythereturnsprlng・

Thisunlockstheclutchdisksandclutchplatestoallowtheclutchshaftandclutchhubtorotate independentlysothatnopoweristransmitted・

12 3 4 5 6

1．SHAFT＆DRUM

7

ASSEMBLY 2．BLEEDVALVE 3．CLUTCHPISTON 4．CLUTCHPLATE 5．CLUTCHDISK 6．RETURNSPRING 7．CLUTCHHUB

ー67−

2．POWERTRA［N

2．4．2 TRANSM［SS10N CONTROL VALVE ThetransmissioncontroIvalveconsistsofasolenoidvalve，Selectorvalve，andaccumulator．When

theHi−Loswitchisoperated，theHi−Loselectorsolenoidisswitchedovertomovetheselectorvalvein

thecontroIvalve，thuscontrollingtheclutchoilpressure．

TRANSMISSlON CONTROLVALVE

SectionalviewA−A

Note：B＞6：：：：：コ11・8N−m（1・2kgf−m） ［8．71bf一札］

B＞Valvetighteningtorque：

6：：：：コ20to29N−m（2to3kgf−m）

1．SPRING 2．STOPPER 3．SPRING 4．PISTON

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

5・COVER

lO．ORIFICE（￠1．4）

［14to221bf一九］

駐＞Capnuttighteningtorque：

ぢ＝コ6・9to9・8N−m（0・7tolkgf−m） ［5．1to7．21bf一札］

Fig．2．52 TransmissionControIValve −68−

2．POWER TRAIN

2．4．3 TRANSMLSS10N CIRCUIT

① Thepressureoilfromthetransmission Charglng／brakepumpflowsintotheHi− Lo transmission whereits flowis branched．Theoilpressureinthecircuit iscontrolledtol．6tol．8MPa（16to 18kgf／cm2）［228to256psi］・Oneof

the oilflows branchedinside the transmissionactsontheHi−Loselector solenoid valve and the selector valve beforepasslngthroughthethrottleinto theaccumulator．

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

Loselectorsolenoidvalveisturnedon andmovedtotheleft．Thepressureoil WhichhaspassedthroughtheHi−Lo selector solenoid valve moves the

Fig．2．53

selectorvalvetotheleft，thusallowlngthepressureoilfromthetransmissioncharglLng／brake toflowthroughtheselectorvalvetoactontheLoclutch・AsthepressureactlngOntheLoclut

increases，theclutchdisksandplatesarelockeduptoswitchoverthetransmissiontolowspeed （Lo）．

③ Theaccumulatorandthrottleareprovidedtoalleviateshockincurredbyclutchengagementwh theloaderspeedisswitchedoverfromhighspeed（Hi）tolowspeed（Lo）orviceversa・

Thatis，thepressureinthecircuitsafterthethrottlegraduallylnCreaSeSduetothethrottleand

accumulator（theperiodbintheabovesketch）・Duringthisperiod，theclutchislockedupgradu

toalleviateshockcausedbyclutchengagement・

④ WhentheHi−LoselectorswitchisplacedinHi，theHi−Loselectorsolenoidvalveandselect

valveareswitchedovertoallowthepressureoilfromthetransmissionbrakevalvetoflowintothe

Hiclutch，thusshiftingthetransmissionintohighspeedmode（Hi）・Theotheroperatingprinci thesameasforthelowspeedmode（Lo）・

−69−

2．POWER TRAIN

SELECTOR ACCUM

ELECTOR OIDVALVE（ON）

THI

TRANSMISS10N CHARGING／BRAKE PUMP−・■■・￣−・・◆ RELIEF VALVE

Hi−LoTRANSMISS10N

Fig．2．54 LowSpeed

L￣￣【▼一一￣￣￣

ACCUMU

̲LECTOR ．

TRANSMISS10N

CHARGING／BRAKE PU

Hi−LoTRA

N

」 Fig．2．55 HighSpeed −70−

2．POWER TRAIN

（1）Himode

① WhentheHi−LoselectorswitchisputintheHiposition，thepressureoilisdeliveredtotheH Clutch（1）．

② AsthepressureoilisdeliveredtotheHiclutch，thepiston（2）movestothelefttolockuptheclutc plates（3）andclutchdisks（4），thusengagingtheHiclutch（1）・

③ WiththeHiclutch（1）engaged，theinputshaft（5）isconnectedtotheHidrivegear（6）・ ④ TheHidrivegear（7）issplinedtotheoutputshaft（8）・TheoutputoftheHSTmotoristransmitted throughtheinputshaft（5），Hidrivegear（6），Hidrivengear（7）totheoutputgear（8）whichisthen rotatedatahighspeed・

Fig．2．56 HighMode

−71−

2．POWER TRAIN

（2）Lomode

① WhentheHi−LoselectorswitchisplacedintheLoposition，thepressureoilisdeliveredtot Clutch（1）．

② AsthepressureoilisdeliveredtotheLoclutch，thepiston（2）movestotherighttolockupt

Clutchplates（3）andclutchdisks（4）toengagetheLoclutch（1）・ ③ WhentheLoclutch（1）isengaged，theinputshaft（5）isconnectedtotheLodrivegear（6）・

④ TheLodrivengear（7）issplinedtotheoutputshaft（8）．TheoutputoftheHSTmotoristransmitted throughtheinputshaft（5），Lodrivegear（6），andLodrivengear（7）totheoutputshaft（8）whichis

thenrotatedatalowspeed．

Fig．2．57 LoMode

ー72−

2，POWER TRAIN

2．4．4 QU］CKSHIFTSWITCH（QSS）

Whenoperatlngthetruck，theoperator，shandsareusuallyfu11，Withhislefthandgrabbingtheste

wheelandhisrighthandcontrollingtheloadhandlinglever・Thequickshiftswitch，locatedonthegrl oftheloadhandlinglever，allowstheoperatortoswitchovertheloader stravelingspeedmodes（Hia

Lo）easilyandsmoothlyatatouchoftheswitch・

Operation ① Thecontrolleralwaysdetectstheloader stravelingspeedthroughthetransmissionrotationsens aswellastheOn−OffstatusoftheQSSandHi−Loswitch．

② whenthefollowingconditionsaresatisfied，yOuCanSWitchoverthetransmis；ionspeedmod

fromHitoLousingtheQSS・ ・TheHi−Loswitchonthedashboard：Hiposition ・Theloader stravelingspeed：1essthan5km／h［3・1mph］ ・QSS：Pressed．（TheearthcircuitfromthecontrollertotheQSSiscompletedsothatthecontroller recognizesthedepressionoftheQSSasthesignal・）（TheQSSisamomentarytypeswitch・）

Thecontrollerallowsthecurrentfromthe＃9fusetoflowtotheHi−Loselectorsolenoidvalve iton，thusswitchingoverthetransmissiontoLo・

Note：Whentheloader，stravelingspeedismorethan5km／h［3・1mph］，yOuCannOtSWitchove transmissionspeedmodefromHitoLo．EveniftheQSSsignalissenttothecontroller contro11erjudge・sthattheconditionformodechangeisnotsatisfiedandthusdisablesthesign fromtheQSS．

③ Whenthefollowingconditionsaresatisfied，yOuCanSWitchoverthetransmissionspeedmode

fromLotoHiusingtheQSS・ ・TheHi−Loswitchonthedashboard：Hiposition iTheloader，stravelingspeed：1essthanmaximumspeed（12・5km／h）［7・8mph］atLorange

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

ThecontrollershutofftheelectriccurrentflowingtotheHi−Losolenoidvalvetoturn，theHi−Lo solenoidvalveoff．

④ TheQSSfunctioniscanceledwhenthe englneisshutoff・Iftheenglneisshut off after the transmission is switched OVertOLobytheQSS function，the transmissionspeedInOdeisputinHi Whentheenglneisrestarted・

Note：The wiring for selection ofthe transmission controller modelsis COnneCted only for the L16−30r LX80＿7．

Fig．2．5＄ −73−

2．POWER TRAIN

HトLo

SW

㊨

＃9 ＃4

fromBAT RELAY

SMISS10N T10NSENSOR TRANSMISS10N

sE。R

SOLVALVE

Switchingpattern Speedrangewherespeedchangeispossible・

SwitchingwithHi−Loselectorswitch

0

1012．5km／h［7L8mph］

5

奏●￣●．．￣ −￣ ●彗…き

Lo → Hi

Enabledwhentravelingspeedis lessthanlOkm／h［6．2mph）．

Hi→ Lo（1） 田 −−■

ご＝

OPer

Hi→1−0（2）

6．2m thetr 】，

Switching with QSS

Hi−Loswitchis

10CkedtoHi

Hi→Lo Gripof10ad QSS ◎ ／ handlinglever

Enabledwhentra lessthan5km／h［

Lo→Hi

Fig．2．59 QSS（QuickShiftSwitch）

ー74−

WhentravellngSPeed

12．5km／h［7．8mph】．

2．POWERTRAIN

2．5 PROPELLER SHAFT

Universal joint

L13・3，LX70・7

Ll（i・3，LX＄0−7

CrossJOint

←

Length（inter−Pindistance）

611mm［24．1in．］ 799mm［31．5in．】 111mm［4．37in．］

561mm［22．1in．］ 785mm［30．9in．］ 90．2mm［3．55in．】

Front Center Rear Ⅵねight

Front＋CenterPrOPeller shafts

23kg【50．71bs］

24kg［52．91bs］

Rear propeller shaft

3．8kg［8．41bs］

5kg［11．031bs］

Thepropellershafts，locatedbetweenthetransmissionandthefrontaxleandbetweenthetransmission andtherearaxle，tranSmitsthepowerfromthetransmissiontothefrontandrearaxles・

Thepropellershaftsabsorbthechangeindriveangleandthechangesinlengthwhentheloader travels，enSurlngSmOOthflowofpowerfromthereductiongeartotheaxles・ TRANSMISS10N

ぺ＝⁚⁚U

FRONTAXLE

B＞旨呂崇諾RPROPELLER

B＞冒訟㌍ROPELLER

REAR AXLE

Note：B＞6：：：：コ34・3N−m（3・5kgf−m）〔25・31bf−ft］forL13−3，LX70−7， 70．6to77．4N−m（7．2to7．9kgf−m）［52．1to57・11bf−ft］forL16r3，LX80−7，

14＝ゝThreadedarea：LOCTITE＃262 駐＞ぢ＝コ223・4N−m（22・8kgf−m）［164・91bf−ft］ B＞Installspline−Sidejointtotransmissionoutputshaft・ B＞Releaseparkingbrakebeforeinstalling．

Note：ThegreasenlPPlesshouldbepolntedtothesamedirection・ Fig．2．60 PropellerShaftAssembly

−75−

2．POWER TRAIN

（Frontandcenterpropellershaft）

1．UNIVERSALJOINT ASSEMBLY 2．HYOKE 3．GREASEFITTING

7．SLEEVEYOKEASSEMBLY 8．BOIJ

4．PILLOWBLOCK 5．UNIVERSALJOINT ASSEMBLY 6．SHAFTYOKE

（Rearpropellershaft）

1．UNIVERSALJOINTASSEMBLY 2．H YOKE 3．BOLT 4．GREASEFITTING

Fig．2．61PropellerShafts

−7（ト

2，POWERTRAIN

2．6 DR］VEAXLES（FRONTANDREAR）

L13−3，LX70−7 Drivlng Frontaxle Rear axle Reductiongearanddifferential Model

Type Differential gear box Differential limiter Finalreductiongearassembly Model

Type Weight Frontaxle Rearaxle

Ll（i−3，LX80−7

4−Wheeldrive

←

Frame−fixed，Semi−floatlngtyPe

←

Trunnion，Semi−floatlngtyPe

←

TCM639−30

TCM619−30 Ordinarytype，2−Stagereduction

←

One−PleCetyPe Torque proportional differential

← ←

TCM619−30 Planetarygeartype

TCM639−30

353kg［7781bs］

402kg［8861bs］

349kg［7701bs］

392kg【8641bs］

←

2．6．1AXLE

Thedriveaxleconsistsofadifferential，finalreductiongearassembly，WettyPebrakeunit，anda Shaft．

Thepowerfromthedriveunitistransmittedthroughthepropellershaftstothefrontandrearax Thepoweristhentransmittedtothedifferentialwhereitisdividedintotherightandleftaxleshaftsto thefinalreductiongearassemblyoneachshaftend，thusdrivingthewheel．

Thewettypebrakeunitisinstalledinfrontofthefinalreductiongearassemblyandsefvesasa SerVicebrake．Fortheoperationoftheservicebrake，referto

3．BRAKESYSTEM・

Axlemoumt

Thefrontaxleisbolteddirectlytothefrontframe． Therearaxleissupportedbythetrunnionmethodinwhichaxlesupportsareinstalledacrosstherear

axleandboltedtotherearframe．Consequently，therearaxleiscradledupanddownaroundthece

lineofthedifferentialaccordingtothegroundconditiontheloadertravels．

Thetrunnion−mOunteddriveaxlehelpsimproveoperatorcomfortbecauseloaderswithatrunni

mounteddriveaxleJOltlessthanthosewiththeconventionalcradle−SuPPOrteddriveaxle，Whe

travelonabadgroundcondition．

−77−

2．POWER TRA［N

臼 二二

白

Detai10farea A

二∴

1

Note：B＞ぢ＝コ100・9±19・6N−m（10・3±2kgf−m） 匡＞6

［74．5±14．51bft氏］，

14＝ゝThreadedarea：LOCTITE＃262 B＞（忘＝コ509・6±98N−m（52±10kgf−m） ［376．1±72．31bf一円 匪＞〆＝＝恥Innersurface：Grease

（Installwithchamferedpartpointedtoaxle・） B＞5 B＞Installwithlippointedoutward．

匝＝＞Installwithgroovepointedtoplate（7）． Detai10farea B

匪＞「⊂＝鞠Fillgreasebeforeinsta11ing・

1．FRONTAXLE 2．REARAXLE 3．AXLESUPPORT（FRONT）

4．AXLESUPPORT（REAR）

5．PACKING 6．BUSHING

7．THRUSTPLATE 8．THRUSTCAP 9．THRUSTWASHER

Note：ThesketchesshowtheaxlesoftheL13＿3andLX70＿7．TheaxlesoftheL16＿3andLX80−7ha samestructureasthoseoftheL13＿3andLX70＿7． Fig．2．62 DriveAxleAssembly −78−

2．POWER TRAIN

Note：臣＞（忘＝コ

88N−m‡9kgf−m）【651bf−ft］，14＝ゝThreadedarea：LOCTITE＃262

匪＞ぢ＝コ

206N−m‡21kgf−m）［1521bf−ft］，血Threadedarea：LOCTITE＃262

匪＞（芯＝コ

29N−m（3kgf−m）【221bf−ft］

陸＞14⊃ゝ

Threadedarea：LOCTITE＃572

臣＞〆＝＝恥

Lip：Grease

匪＞超＝ゝ

Matingsurfaces‥LOCTITEFMD−127

l．0ILSEAL 2．AXLESHAFT 3．DIFFERENTIALBODY 4．DIFFERENTIAL

6．FINALREDUCTIONGEAR

5．PLUG（CHECKPORT）

9．RINGGEAR

lO．PIN

ASSEMBLY

11．BREATHER

7．AXLETUBE 8．OILDIPSTICK

12．COVER 13．BLEEDER 14．DRAINPLUG

Note：ThesketchesshowthefrontaxleoftheL13−3andLX70−7．ThefrontaxleoftheL16−3andLX80−7 hasthesamestructureasthatoftheL13−3andLX70−7． Fig．2．63 FrontAxle −79−

2，POWER TRAIN

Note：B＞ぢ＝コ88N−m（9kgf−m）［651bf−ft］，超＝ゝThreadedarea：LOCTITE＃262 B＞ 芯＝コ206N−m（21kgf−m）［1521bf−ft］，疋＝ゝThreadedarea‥LOCTITE＃262 匡＞ぢ＝コ29N−m（3kgf−m）［221bf−ft］

B＞14＝ゝThreadedarea：LOCTITE＃572 B＞β＝＝恥Lip：Grease

B＞正＝ゝMatingsurfaces：LOCTITEFMD−127 6．AXLETUBE 7．RINGGEAR

11．BLEEDER 12．OILDIPSTICK

3．DIFFERENTIALBODY

8．PIN

13．PLUG（CHECKPORT）

4．DIFFERENTIAL 5．FINALREDUCTIONGEAR

9．BREATHER

14．DRAINPLUG

1．OILSEAL 2．AXLESHAFT

lO．COVER

ASSEMBLY

Note：ThesketchesshowtherearaxleoftheL13−3andLX70−7．TherearaxleoftheL16−3andLX8 hasthesamestructureasthatoftheL13＿3andLX70＿7． Fig．2．

4 RearAxle

−80一

2．POWER TRArN

2．6．2 DIFFERENT］AL

Thedifferentialisintegralwiththereductiongear． Thepowerfromthepropellershaftsistransmittedthroughthedriveplnionandtheringgeartothe

differentialgearcase．Itisthensentthroughtherightandleftsidegearstothefinalreductiongear．

SPeedreductionofthepowerisaccomplishedbetweenthedriveplnionandtheringgear．

Thedifferentialoperatesasfollows：

Whiletheloadertravelsstraight，theringgeardifferentialgearcaseandsidegearsrotatetogethe

Withtheplniongearsinsidethedifferentialgearcasenotrotatlng．Thepowerofthesamespeedisthus transmittedfromtherightandleftsidegearsthroughtheaxleshaftstothewheels．Whentheloader

makesaturn，therightandleftwheelsrotateatdifferentspeeds；theplniongearsinthedifferential

CaSerOtatearOundtheirownaxesaccordingtothedifferenceinspeedbetweentherightandleftgears． WhiIetravellngStraight

While makin

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

Fig．2．65 DifferentialGearOperation

Torque proportional differential Wheelloadersoftenneedtoworkonabadgroundconditionsuchasonsandorinaswampyplace．

Onsuchabadgroundcondition，aloaderwiththeconventionaldifferentialcanskid，thusmakin

difHculttodeliveritsperfbrmance・Inaddition，thetireswillalsowearoutprematurely・Topreven

fromhappenlng，SOmemOdelsmaycomeequlPPedwithatorqueproportionaldifferentialwhichlimits differentialaction． Thetorqueproportionaldifferentialhasalmostthesameconstructionasthestandarddifferential assemblyexceptthatthedifferentialplniongearshaveanoddnumberofteethofaspecialcontour．

Whenthetiresareabouttoskidonsoftground，theplniongearscontinuetotransmltPOWertObothside gearswithoutidlinguntilthedifferenceinroadresistancebetweentherightandlefttiresreachesa

Certainpolnt，thuspreventlngthetiresfromskidding．

ー81−

2．POWERTRALN

Note：B＞ぢ：：＝コ88N−m（9kgf−m）【651bf−ft］，14＝ゝThreadedarea：LOCTITE＃262 臣＞ぢ：：＝コ49N−m†5kgf−m）［361bf−ft］，正＝ゝThreadedarea‥LOCTITE＃262

B＞ぢ：：コ539N−m（55kgf−m） B＞血Outerdiameter：LOCTITE＃262，忙＝⊃弘Lip：Grease 匝＞Backlashbetweenringgearandpiniongear：0．20toO．28mm［0．0079toO・0110in・］ 恒＞ShimadjustmentinarangefromO・55tol・55mm［0・0217toO・0610in・］（Bothsides）

1．OILSEAL

7．THRUSTWASHER

2．BEARINGRETAINER

8．THRUSTVVASHER

3．CASEB

15．SHIM

4．RINGGEAR

9．PINIONGEAR lO．BEARINGCAGE

5．CASEA 6．SHIM

ll．SPACER 12．FLANGE

17．PINIONGEAR 18．SIDEGEAR

Fig．2．66 Differential

−82−

13．COVER 14．OILSEAL 16．SPIDER

2．POWER TRAIN

2．6．3 FINAL REDUCT10N GEAR

Thefinalreductiongearassemblyisaplanetarytypeandprovidesfinalspeedreductionofthepower fromtheenglneinthepowertransmissionline・

Thepowerfromthedifferentialgearrotatestheshaftandthethreeplanetgearsinsidetheringgear・ Therotationoftheplanetgearsistransmittedtotheplanetcarrierandthentotheaxleshaft・

←：Powerflow

Sectionalview A−A

1．DRIVEPINION 2．DIFFERENTIAL

3．GEAR＆SHAFTASSEMBLY

4．PLANETSHAFT 5．PLANETGEAR 6．RINGGEAR（FIXED）

Fig．2．67 PowerFlow −83−

7．PLANETCARRIER 8．AXLESHAFT

2．POWER TRAIN

14 15 16 17

Note：B＞Imprintedsurfaceshouldbepointedtopiston・ 匡⊃＞Shima句ustmentprocedure l）Tightenthebolt（12）tothetighteningtorqueof49N−m（5kgf−m）【361bf−ft］andpushin axleshaftbearlngCOne，turnlngaXleshaft・

2）Measurespacingbetweenretainerplate（11）andaxleshaft・Measuredvalue＝Y

3）ChooseshimswhosethicknessisO．03toO．10mm［0．0012toO・0039in・］greaterthant valueY． 4）Installshimsandinsta11retainerplateandbolt．

ぢ＝＝コ294N−m（30kgf−m）【2171bf−R］forL13−3，LX70，7，333N−m†34kgf−m）［2461bf−

ft］forL16−3，LX80−7，14＝ゝThreadedarea：LOCTITE＃262 Thebearing

srotationalresistancetorqueis19．6to24．5N（2to2・5kgf）【4・4to5・51bf］

Onthetubefittingboltpitchcircle． l．PLANETCARRIER

7．ENDPLATE

13．GEAR＆SHAFTASSEMBIJY

2．SHAFT

8．BRAKEDISK 9．BRAKERING

14．PIN

lO．SHIM ll．RETAINERPLATE

16．PISTON 17．DRING

3．BALL 4．PLANETGEAR 5．RINGGEAR 6．NEEDLEROLLER

15．DRING

12．BOIJ

Fig．2．68 FinalReductionGearAssembly −84−

2．POWER TRAIN

2．7 WHEELASSEMBLY（T］REANDWHEEL）

Tire Wheel（rim）

L13−3，LX70・7

Ll（i・3，LX80・7

16．9Ⅹ24−10PR

18．4Ⅹ24−10PR

Tubelss，L−2

Tubelss，L−2

W15Lx24

W16Lx24

Weight（PerPiece）

Tire Rim

Inflationpressure

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］

2．7．1TIRE

Thestandardmodelisprovidedwithlock−tyPeL−2tireswhichfeaturehightraction・Selectapprop tiressincethereareavarietyoftiresavailableaccordingtotheapplicationandpurposeofwork．

Thetiresizeisexpressedininches・Thestrengthoftiresisexpressedinplyrating（PR）：forexam

10PRmeansastrengthcorrespondingtothatoflOpiecesofcottoncords・（PRdoesnotnecessaril Standforthenumberofcordpliesinthetire．） Example：

芋

Tirewidth（in．）

千−

Rimdiameter（in．）

10PR

Tire strength

T

2．7．2 WHEEL ・Thewheelconsistsoftherimanddisk．Thediskisboltedtotheaxleshaft． ThetireisinstalledontherimandbothserveasonepleCe．Itisthusimportanttouseanapproprlate rimwheninstallingatireontherim．Theuseofaninapproprlaterimmayresultinashortlifeofthetire andintheworstcasemightleadtoaseriousaccident・Therimsizeisalsoexpressedininches．Thefirst

numberstandsfortherimwidthandthenextonetherimdiameter．

t85−

2．POWER TRAIN

（Tire）

1．TIRE 2．RIM 3．VALVE

（Treadpattern）

（Rim）

1．RIM 2．VALVEGUARD 3．DISK

Note：B＞6：＝コWheelbolt：863±40N−m（88±4kgf−m）［637±291bf−ft］

Fig．2．69 TireandRim

ー86−

3．BRAKE SYSTEM

3．BRAKESYSTEM Servicebrake

Type

Frontandrearwheelindependentbraking，Wetdiskhydraulic，

Numberoffluidline Brakevalve

booster type Independent21ines Tandembrakevalve

Diskbrake

Four−Wheel，WettyPediskbrake

Brakepump

ThetransmissionchargepumpISuSedl）

Oiltank

0．28L【0．074U．S．gal．】

Brakeoilpressure Alarmdevice Safety device Parkingbrake Type Location

3．7MPa（38kgf／cm2）［540psi］

Reductiongearoutputshaftbraking，SPrlng，Wetdiskbrake type Reduction gear

Note：1）Forthespecificationandconstructionofthebrakepump，referto

6・2PUMP・

A Donotshutofftheenginewhiletheloaderisrunning・Iftheenginestallswhiletheload runnlng，theparkingbrakewi11beautomatica11yappliedtobraketheloaderrapidly・

−87−

3．BRAKE SYSTEM

3．1SERVICE BRAKE 3．1．1GENERALDESCRIPT10N（BRAKEuNE） （1）Servicebrakeline Theservicebrakeisa4LWheel，WettyPediskbrakeandusesthefull−POWerbrakesystem．

Thehydraulicbrakelinehasanindependent2−1inesystemforthefrontandrearwheels．Ifone twolinesisdamagedforanyreason，yOuCanbraketheloaderuslngtheotherline．However，itshouldbe

notedthatwhenonebrakelineisdefective，thebrakingforcedropsandyouneedtoglVealongerpedal StrOketobraketheloader．

（2）Safbtyandalarmdevices

●Yourloaderisequippedwithabrakevalve（Oil−OVerbooster）．Ifthepumpstops，yOuCanOb

brakingforceinproportiontoyourbrakepedaleffortbypresslngthebrakepedalforcefu11y．However

itshouldbenotedthatthebrakepedalisharderthanusualandthebrakingforceislow．

ADonotshutofftheenginewhiletheloaderisrunning．

●Thebrakeoiltankhasalevelswitchinsideit．Whenthebrakeoilleveldropsbelowthespecifie Value，theoperatorwillnoticeitimmediatelybywayofthe

dashboard．

−88−

brakeoi11evel

warnlnglampont

3．BRAKE SYSTEM

㊥：tOTRANSMISSIONCONTROLVALVEandPARKINGBRAKE ㊥：tOTRANSMISSIONHOUSINGDRAINPORT

Note：Specificationsandapplicationsofswitches Position

A

B

OFFwhenpushrodispushed・

Stoplampswitch Stoplamp Level switch （insideoiltank）

1．BRAKEPEDAL 2．BELLCRANK 3．BRAKEVAINE

Specifications

Application

Name

ONwhenpushrodisreleased・

Brakeoillevel warnlnglamp

ONwhenlevelislow．

4．TRANSMISSIONSUMPTANK

7．BRAKEOILTANK

5．TRANSMISSIONCHARGINGPUMP

6．TRANSMISSIONINLINEFIIXER

Fig．3．1ServiceBrakeLine −89−

8・WETTYPEDISKBRAKE （Incorporatedinaxle）

3．BRAKE SYSTEM

to TRANSMJSS10N CONTROL VALVE

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

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

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

Fig．3．2 BrakeOilPressureCircuitDiagram

−90−

3．BRAKE SYSTEM

Operation

（1）Brakepedalinneutral ① Whenthebrakepedal（1）isnotpressed，thebrakevalve（3）isinneutral・

Theoildischargedfromthetransmissionchargingpump（5）flows，PaSSingthroughtheinlinefil （6），tOthebrakevalveinletport・

Thepressureoilthenflowsthroughthebrakevalvepowercylinderandoutletporttothetransmissio controIvalve．

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

Fig・3・3 BrakePedalinNeutral

一91一

3．BRAKE SYSTEM

（2）Brakepedalpressed

① Whenthebrakepedal（1）ispressed，thepushrodofthebrakevalve（3）ispushedthroughth bellcranktoactivatethevalve． ②Insidethebrakevalvepowercylinder，thepowerpistonismovedbythepressurefromthepump，

whiletheresidualoilpressureissenttothetransmissioncontroIvalve・

③Insidethebrakevalvemastercylinder，thesecondaryandprimarypistonsmovetosendthebrak Oiltothediskbrake（8）tooperateit．

Fig．3．4 BrakePedalPressed

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

Thebrakeoilactivatingthediskbrake（8）returnsthroughthemastercylindertothebrakeoi （7）．Thebrakeoilpressureisthusremovedandthediskbrakeisreleased・

−92t

3．BRAKE SYSTEM

3．1．2 BRAKE VALVE

Thebrakevalveisanoil−OVerboosterwhichbooststhemastercylinderoilpressureinproportionto thebrakepedaleffort，uSlngtheoildischargedfromtheoilpumpasaboostlngSOurCe・ Thebrakevalve，COnSistingofabooster（POWerCylinder）andatandemmastercylinder，OPerateSa

follows：Whenthebrakepedalispressed，thespooIconnectedtothebrakepedalnarrowsthevar orificetodeliverboostedoilpressuretothepowerpIStOndfthebooster，thusactivatingthetandem mastercylinder．

Thefeelofoperationisobtainedbyacombinationofthepedalstrokefo1lowlngthestrokeofthe tandemmastercylinderpIStOnandthereactionforceproducedbyfeedingbackthebrakeoilpressure generatedinthetandemmastercylinderfromthereactionpIStOn・Thisprovidesfinebrakecontrol・

Evenifthepumpfailstooperatenormallyforanyreason，thebrakepedaleffortisapplieddirectlyto

thetandemmastercylindertoachievethebrakingforceinproportiontothepedaleffort（fail− mechanism）．

Note：B＞6：＝＝コ29・4to34・3N−m（3・Oto3・5kgf−m） ［21．7to25．31bf一明

B＞ E：：：コ24・5to37・3N−m（2・5to3・8kgf−m） ［18．1to27．51bf一明

R＞（芯＝コ9・8to14・7N−m（1・Otol・5kgf−m） ［7．2tolO．81bf一打］

B＞（芯＝コ13・7to39・2N−m（1・4to4・Okgf−m） ［10．1to28．91bf一明

正＝ゝThreadedarea＝LOCTITE＃262 B＞ E＝コ8・82to12・7N−m（0・9tol・3kgf−m） 【6．5to9．41bf一氏】

1．INLETPORT 2．OUTLETPORT

3．DRAINPORT 4．TANKPORT Fig．3．5 BrakeValve −93−

5．BRAKEPORT（2）

3．BRAKE SYSTEM

（Powercylinder） 151617

1

2

10 111213

8 9 （Mastercylinder）

23 22

25 24 21

19．SECONDARYPISTON

2．PUSHROD

10．SPRING ll．CONNECTOR

20．CONNECTOR

3．DUSTCOVER

12．SPRING

21．PRIMARYPISTON

4．SPOOL

13．ROD

5．OILSEAL

14．RELIEFVALVE

22．CUP 23．SPRING

6．BODY 7．CYLINDERCOVER

15．SPRING

24．STOPPER

16．PLUG

25．CUP

8．POWERPISTON

17．SET SCREW 18．BODY

26。SPRING

1．JOINT

9．SPRING

Fig．3．6 BrakeValve −94−

3．BRAKE SYSTEM

Operation

（1）Brakevalvenotactivated

① Whenthepushrodconnectedtothebrakepedalisreturned，thespool（1）andconnector（5）assemb andpowerpiston（4）arealsoreturnedtothecylindercover（3）side・

② Therefore，theprimarypiston（7）andsecondarypiston（6）ofthemastercylinderremainatthei respectivehomepositions，Withthepressurechambers（DandC）（Chambersconnectedtothebrak ports）areopenedthroughthereliefporttotheoiltank・ （2）Brakevalveactivated

① Thepressureoilfromtheoilpumpflows，PaSSingthoughthepowercylinderinletport，ther chamber（A）ofthepowerpiston（4），throttlepassageformedbythespool（1）andthepowerpis （4），andthefrontchamber（B）ofthepowerpiston（4），tOtheoutletport・

② whenthebrakepedalispressed，thespool（1）advancesthroughthepushrodconnectedtoth pedaltonarrowthepassagebetweenthepowerpiston（4）andthespool（1）・

Therefore，aPreSSuredifferentialisproducedbetweenthefFOntandrearchambers（AandB）ofth powerpiston（4）toforcethepowerpiston（4）tomoveforward，thuspushingtheconnector（5） whichinturnactivatesthesecondarypiston（6）ofthemastercylinder・

B

1．SPOOL 2．RELIEFVALVE 3．CYLINDERCOVER

5

6

4．POWERPISTON 5．CONNECTOR 6．SECONDARYPISTON

Fig．3．7 BrakeValveOperation

ー95−

C

7

D

7．PRIMARYPISTON

3．BRAKE SYSTEM

③ Whenthesecondarypiston（6）advancestoproducepressureinsidethepressurechamber（C），the

PreSSureisalsosenttothereactionchamberbuiltinthesecondarypIStOn．ThereactionplStOn

（Small−diameterpiston）retractsandhitsthefrontendofthespool（1）．Thepressureproduce

themastercylinderisthustransmittedthroughthepushrodasanoperatlngreaCtionforcetothe pedal．

④ Thepressureproducedinthepressurechamber（C）ofthemastercylindersecondarypistonsi alsomovestheprimarypiston（7）forwardtoproduceapressureinthepressurechamber（D）ofthe

Primarypistonside．Thepressureproducedinboththechambers（CandD）flowsoutofthebra

POrttOCreateabrakingaction．

⑤ Theoilpressureinthepow？rCylinderiscontrolledbythepressuresettingofthereliefvalve（2） Whichisinturndeterminedbythemastercylinder

sspecificationpressure．

（3）Safetydevice

①Ifthehydrauliccircuitatthepowercylindersidefailstooperatenormally，yOuCanaCtuatet mastercylinderpistonthroughthespool（1）andconnector（5）bycontrollingthebrakepedal．

② Themastercylinderisatandemtypesothatifeitherthefrontortherearlinefailstoope normallydueto，forexample，Oilleaks，yOuCanaPPlythebrakeuslngtheothernormalline．

（4）Whenthebrakeisreleased

① Whenthebrakepedalisreleased，thenarrowedoilpassagebetweenthespool（1）andthepowe

Piston（4）isopenedtotheoriginalstateandthepowerpiston（4）andconnector（5）arereturne thecylindercover（3）side．

② Followingthemovementofthepowerpiston（4）andtheconnector（5），theprimarypiston（7）and

SeCOndarypiston（6）ofthemastercylinderarereturnedtothenon−OPeratingposition，Withthe

respectivepressurechambers（CandD）openedthroughthereliefporttotheoiltank．

−96−

3．BRAKE SYSTEM

3．1．3 DISK BRAKE

Thediskbrakeisawet，Slngle−Platetypeandbuiltinthedifferentialbodyofthedriveaxle・Onthi loader，fourdiskbrakeunitsareinstalledonthefourwheels，Oneforeach・ Forthestructureofthediskbrake，referto 2．6DRIVEAXLE． Operation （1）Brakeinoperation

WhenthebrakeoilactsonthebackofthebrakepIStOn，thebrakediskislockedupwiththebrake rlngandendplate・Theinnerperipheryofthebrakediskissplinedtotheshaftinthepowertrans line・Theouterperipheryofthebrakeringandendplatearesecuredtothedifferentialbodybyp thatthelockedupbrakediskstopsrotatlngtObraketheloader・ （2）Brakereleased

WhenthebrakeoilpressureactlngOnthebrakepistonisreleased，thebrakepIStOnreturnSSlightlyto makethebrakediskfree，thusreleaslngthebrakingforce・

1．AXLESHAFT 2．PLANETCARRIER 3．SHAFT

4．BRAKEDISK 5．ENDPLATE 6．PIN Fig．3．8 DiskBrakeOperation

一97−

7．BRAKERING 8．BRAKEPISTON 9．DRING

3．BRAKE SYSTEM

3．1．4 BRAKE OILTANK Thebrakeoiltankholdsoiltobedeliveredtothebrakevalvemastercylinder．Thebrakeoilisused

foroperatlngthediskbrakes．

Brakeoiltobeused：EngineoilSAE5W−20 Capaclty：

1．OL［0．26U．S．gal．］（total），0．28L［0．073U・S・gal・］（reservoir）

A Donotusethegeneralautomotivebrakefluid（JISautomotivenon・mineralbrakefluid） otherwisetherubberpartsofthebrakesystemmightbedamagedtocausethebraketofai1to OPeratenOrmally，thusresultinglnaSeriousaccident・

Usethemineralbrakefluidforthebrakesystemofyourloaden

Note：Max．：283cc［17．3in．3］

Min．：150cc［9．2in．3］

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

Fig．3．9 BrakeOilTank

ー98−

3．BRAKE SYSTEM

3．2 PARKING BRAKE

Manualreleasingofparkingbrake（asanemergencymeasure）A Iftheparkingbrakecannotbereleasedwiththeparkingbrakeswitchduetoadefectiv早PumPOrf anyotherreason，manuallymovethebrakepIStOnbyuslngtheparkingbrakereleasebolttoreleasethe Parkingbrake．

AManuaJlyreleasingtheparkingbrakeshouldnotbeabused．Itshou）dbe）imitedtoadisab）ed

loaderneedingtobemovedtoanout・Of・trafficarea・Iftheparkingbrakeneedstoberel withtheloaderparkedonaslope，besuretoblockthewheels・

Manuallyreleaslngtheparkingbrake

① Removethetwoparkingbrakereleasebolts（1） fromtheparkingbrakecapofthetransmission・ ② outofthefourplugs（2）installedontheparking brakecover，remOVetWOdiagonallyopposite

Plugsthatcanbemoreeasilyremoved・

Fig．3．10 ③Inserttheremovedbolts（1）（w／owasher）through

theplugholeintothescrewholeatthecenterof thebrakepiston（3）． ④ Tighten the release bolts（1）alternately to Withdrawthebrakepiston（3），thusreleasingthe

diskbrake．（Thediskbrakewillbereleasedby glVinganother2to3turnsafterthebolthead COntaCtSthebrakecover．）

Fig．3．11

−99−

3．BRAKE SYSTEM

3．2．1GENERALDESCRIPT［ON（BRAKEL］NE）

Theparkingbrakeisamechanical（SPring）typewet，multiplediskbrakeandinstalledonthe

transmissionoutputshaft．

Theparkingbrakeisoperatedwiththeparkingbrakeswitchintheoperator scompartment・

DISK BRAKE SPRING

ー 」

BRAKE PISTON

F ← PARKING BRAKESWITCH （Releaseposition）

−−−一一卜1T…−−−−■

TRANSMISS10N BRAKE PUMP PARKlNG BRAKE SOL VALVE （ONposition）

」 ＿−＿＿▼＿＿＿＿＿■ Hi−LoTRANSMISS10N

Position

④

Specification

Use

Name

Pressureswitch Transmissionclutch

OFF：0．64MPa（6．5kgf／cm2）［92．4psi］

（parkingbrake SWitch）

ON：0．27MPa（2．8kgf／cm2）［39．8psi］

Cut−Offand parking

brake

indicationlight

Theswitchisturnedonatatmosphericpressure．

Fig．3．12 ParkingBrakeLine

ー100−

3．BRAKE SYSTEM

Operation

（1）Releasingparkingbrake ，

①Whentheparkingbrakeswitch（1）isturnedOFF，thepressureoilfromthetransmis piston（3）．

②Thebrakepiston（3）movesagainstthespring（4）byoilpressuretoreleasethediskbrake（5）・

Fig．3．13 ReleaslngParkingBrake

（2）Applyingparkingbrake

①WheIltheparkingbrakeswitch（1）isturnedON，theoilfromthetransmission／brakepumpi

blockedintheparkingbrakesolenoidvalve（2）・Thepressureoilinthefrontchamber（A）ofthe brakepiston（3）isdrainedthroughthebrakevalve（3）・

②Thebrakepiston（3）ismovedbythespring（4）toactuatethediskbrake（5）． ′

Fig．3・14 ApplyingParkingbrake −101−

3．BRAKE SYSTEM

3．2．2 PARKING BRAKE ELECTRIC CIRCUIT

Theparkingbrakeelectriccircuitconsistsofaparkingbrakeswitch，Parkingbrakerelays（1，2），

aparkingbrakesolenoidvalve．

Functionofparkingbrakerelays ●Parkingbrakerelay（1）

Theparkingbrakerelay（1）turnsonandofftheparkingbrakesolenoidvalvewhentheparkingbr SWitchisturnedonandoff． ●Parkingbrakerelay（2）

Theparkingbrakerelay（2）completesthepowerholdingcircuitwhentheparkingbrakeswitchi turnedoff．

Note：Inthecircuitdiagramshownabove，thepowersupplyisOFFandtheparkingbrakeswit ON．

Fig・3・15 ParkingBrakeElectricCircuit

−102−

3．BRAKESYSTEM

（1）ParkingbrakeswitchinOFF Aftertheenginehasbeenstarted：

1．WhentheparkingbrakeswitchisturnedtotheOFF（1）position，theparkingbrakerelay（2 activatedtoallowthepowerfromthebatteryrelaytoflowtotheparkingbrakerelay（1），t actuatlngtheparkingbrakesolenoidvalvetoreleasetheparkingbrake・ 2．Theparkingbrakerelay（2）holdstheparkingbrakereleasepower・

Fig．3．16 ParkingBrakeinOFF

−103−

3．BRAKE SYSTEM

（2）ParkingbrakeswitchinON Aftertheenginehasbeenstarted：

Whentheparkingbrake（1）isapplied，POWerisnolongersuppliedtotheparkingbrakesoleno

Valveandthustheparkingbrakeisapplied．

Fig．3．17 ParkingBrakeinON

ー104−

3．BRAKE SYSTEM

3．2．3 PARKING BRAKESOLENO［DVALVE

TheparkingbrakesolenoidvalvecontroIsthesupplyofpressureoiltothediskbrake・ Theparkingbrakesolenoidvalveisswitchedoverwiththeparkingbrakeswitchtoactuatethedisk brake．

（P）（T）

P：fromTRANSMISSION／BRAKEPUMP A：tODISKBRAKE

T：tOOILTANK（RETURN）

Fig. 3.18 Parking Brake Valve

ー105−

3．BRAKE SYSTEM

3．2．4 DISK BRAKE

Thediskbrakeisawetmultiple−Platetypeandinstalledontheoutputshaftofthetransmissio

Thediskbrakeisactuatedbythebuilt−insprlngandreleasedbythepressureoilfromtheparkingbrake solenoidvalve． Forthestructureofthediskbrake，referto

2．4DRIVEUNIT．

Operation （1）Diskbrakeinoperation

①Whenthepressureoilactingonthebrakepistonsisdrained，thebrakepistonismovedtothelef

thesprlngforcetolockupthebrakediskswiththebrakeplates．

②Theinnerdiametersofthebrakedisksaremeshedwiththetransmissionoutputshaftthroughthe

diskhub．Theouterdiametersofthebrakeplatesaremeshedwiththebrakehouslng．Asthebra

disksareforcedagalnStthebrakeplates，theyarelocked．Thisinturnstopstherotationof transmissionoutputshaftthroughthediskhub，thusapplyingtheparkingbrake．

5

4 3

1．BRAKEPISTON 2．SPRING 3．ENDPLATE 4．BRAKEHOUSING 5．BRAKEPLATE 6．DISKHUB 7．BRAKEDISK 8．OUTPUT SHAFT

Fig．3．19 DiskBrakeinOperation （2）ReleasingBrake

①Whenthepressureoilissenttothebackofthebrakepiston，thebrakepistonovercomesthespri forceandshiftsitspositiontotheright．

②Aclearanceiscreatedbetweeneachbrakediskandbrakeplatetomakethebrakedisksfree，thus

releaslngthebrake．

−106−

4．STEERING SYSTEM

4．STEERING SYSTEM 平pe

Frame−articulatingtype

Mechanism

Orbitrol type

Framearticulatingangle

400torightandleft

NumberofrotationsofsteerlngWheel

4．0

Powersteering 0rbitrol（L2HDBD）

Model

Dynamic single

Type Pressure setting Steering pump

17．2MPa（175kgf／cm2†［2490psi］

Usedalsoasmainpumpl）

SteerlngCylinder

Type

Double−aCtlngPIStOn

Quantity

2

Cylinderstroke

395mm［15．6in．］ 17kg【37．51bs］

Weight（PerCylinder）

Note：1）Forthespecificationsandstructureofthemainpump，referto

6．2PUMP．

4．1GENERAL DESCRIPT10N ThesteerlngSyStemisaframe−articulatingtypewhichsteerstheloaderbyoperatlngthetwosteerlng

Cylindersbetweenthefrontandrearframes．

Fig．4．10rbitroITypeSteerlngSystem

−107−

4．STEERING SYSTEM

Thesteeringmechanismisorbitroltype（full−hydraulicpowersteering）whichdoesnotuseanylin mechanism，butoperatesonhydraulicpoweralone．

ThesteerlngSyStemCOnSistsofthesteerlngWheelunit，Orbitrol，PrlOrltyValve，SteerlngCylin

andhydraulicpIPlng．

AIfthepressureoilisnotsuppliedfromthepumphranyreasonsuchaswhentheenginestalls，

theorbitrolactsasamanualsteerlngSyStem，thusmakingitpossibletosteertheloadenIIoweve notethatsteerlngOPerationisconsiderablyharderthanusual． STEERING WHEEL

STEERING WHEEL UNIT PRlORlTY VALVE

ORBITROL

STEERING CYLINDER

Note：TheabovesketchdoesnotillustratethehydraulicpIPlng． ForthehydraulicpIPlng，referto

6．HYDRAULICSYSTEM．

Fig．4．2 SteerlngSystem

−108−

4．STEERING SYSTEM

4．2 0LLCIRCULAT［ON ROUTES TheoilpickedupfromtheoiltankbythemainpumpISSentunderpressuretotheprlOrltyValve whereitisdividedintotwoportions： ClrCult．

ThesteerlnghydrauliccircuitusestheloadsenslngSyStemWhichletsthesteerlnghydrauliccircuit takeprlOrltyOVerthemaincircuitsothattheorbitrolreceivesthenecessaryamountofoilfromthe

prlOrltyValve，Withtheresidualamountofoilbeingsenttothemaincircuit・ WhenthesteerlngWheelisturned，theoilissentintoonesteerlngCylinder・Theoildischargedfrom theothersteerlngCylinderreturnsintotheorbitrolfromwhichitreturnsintotheoiltank・ Note：FortheoperationoftheloadsenslngSyStem，referto＝4・5PRIORITYVALVE・

STEERING CYLINDER

STEERING WHEEL ORBITROL

to CONTROL VALVE

PRlORlTY VALVE

MAIN，STEERING PUMP

ENGINE ；i：≠HA。㌘ OILTANK

Fig・4・3HydraulicCircuitDiagram −109−

PUMP

4．STEERING SYSTEM

4．3 STEERING WHEEL UNIT ThesteerlngWheelunitisinstalledinthecockpit．Belowitistheorbitrol．

WhenthesteerlngWheelisturned，therotationistransmittedthroughthesteerlngShaftwhichinturn actuatestheorbitrol．

Steerin

Wheelunit

Note：B＞ぢ＝コOrbitrolmountingbolt： 34．3to40．2N−m（3．5to4．1kgf−m） ［25．3to29．71bf一札】

B＞〆＝＝恥 Splines：Molybdenumgrease

Sectionalviewofsteerin

wheel unit

B＞正＝ゝWater−PrOOfseal 匡＞〆＝＝袖Grease

匝＞紹＝ゝSyntheticrubberadhesive 1．STEERINGWHEEL

5．SOUND−ABSORBINGMAT

9．BEARING

2．STEERINGWHEELUNIT

6．ORBITROL

3．MOUNTRUBBER

7．BUSHING 8．GROMMET

10．COLUMN ll．STEERINGSHAFT

4．BRACKET

Fig．4．4 SteerlngWheelUnit tllO−

4．STEERING SYSTEM

4．4STEERINGVALVE（ORBITROL） TheorbitroIconsistsofthecontroIvalvesectionandtherotorsetsection・

ThecontroIvalveisarotaryvalvetypewhichchangesovertheoilpassagesbyrotatlngltSelf，tO SteerlngCylinders・

TherotorsetislocatedunderthecontroIvalve・Usually，1taCtSaSanOilmotortoperformme function・Inanemergency，1tisusedasahandpumpandactsasamanualsteerlngunit・ R

L

T LS P （Circuitdiagram）

L，R：CYLINDERPORT

P：PUMPPORT T：TANKPORT LS：LOADSENSINGPORT

Note：B＞ぢ＝：：：：コ28・4N−m（2・9kgf−m）［21・01bf−ft］

Fig．4．5 0rbitrol −111−

4．STEERING SYSTEM

（8）

（4） 三千

Detai10farea B 10

1

234 5 111 1

（Gerotorstarmountingposition）

1 9

6 1 78 9 0 1 11 1 2 2

8 7 6 5

2 2

4 3

SectionalviewofA−A

1．ENDCAP 2．SPACER 3．SPACERPLATE 4．DRIVE 5．HOUSING 6．SPOOL 7．SLEEVE 8．PIN 9．NEEDLEBEARING

10．OILSEAL ll．SEALGLANDBUSHING 12．DUSTSEAL 13．RETAININGRING 14． 0 −RING

15．FLATSPRING 16．CENTERINGSPRING 17．BALL 18．CHECKVALVEBODY Fig．4．6 0rbitroIStructure −112−

19．CHECKVALVEPOPPET 20．GUIDE 21．SPRING 22．ADAPTERSCREW 23．GEROTOR 24．DRIVE 25．GEROTOR 26．ORIFICEPLATE

4．STEERING SYSTEM

ORBITROL OPERATION （l）SteeringWheelinNeutral

TheoilfromPportflowsintothecavitybetween

thespool（2）anddriveshaft（3）throughthesmall OPeningsofthesleeve（l）andthespool（2）・Theoil

inthecavltyflowsoutfromtheTportthroughthe upperpartofthedriveshaft，andnotchgrooveofthe SPOOlandsleeve．TheRandLports（Cylinderports）

areclosedbythespool・

Fig．4．7 NeutralState

（2）TurningSteeringWheelCounterclockwise WhenthesteerlngWheelisturned，COunterClockwise， thespool（2）isrotatedwithrespecttothesleeve（1）to

Closetheneutralflowpassage（Smallopenings）・

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

Theoildischargedbyrotationoftherotorissentto

thecontroIvalvesectionandthenflowsfromtheLport intothesteerlngCylinderthroughthesleeveandspool・

TheoildischargedfromthesteerlngCylinderreturns totheRportandflowsoutfromtheTportthroughthe

Sleeveandspool． 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 ofrotorto SteerlngWheelisexecutedcontinuously・

Fig．4．9 RotorSetSectioninOperation ー113−

4，STEERING SYSTEM

（3）nLrningSteeringWheelClockwise

Whenthesteeringwheelisturnedclockwise，the rotorrotatesinadirectionoppositetodirectionofrotor

rotated when the steering wheel is turned COunterClockwise，therebyinversingoilintakeand dischargebytherotor． TheoilflowsfromtheRportintothesteering

Cylinders，andtheoildischargedfromthesteering CylinderreturnstotheLport．

Fig．4．10 ClockwiseRotation

（4）EmergencyOperation Whenthehydraulicoilisnotsuppliedfromthe

PumPd二uetOenglneStOP，theorbitroIservesasan emergencysteeringunit． Whenthe steeringwheelis turned，rOtationis transmittedtothe drive shaft（3）andtherotor（5） throughthespool（2）andcrosspin（6）． Therotor，Putintorotation，drawsinoil．Negative

PreSSureiscreatedintheoilpassage，SOthatthecheck Valve（7）isopenedtodrawinoilfromtheTport．

Theoildischargedfromtherotorissenttothe SteerlngCylinderthroughthecylinderporttochange thedirectionoftheloader． TheoildischargedfromthesteerlngCylinderreturns toanothercylinderportandisdrawnintotherotor

throughthecheckvalve（7）． Note：Incaseofemergencyoperation，thesteerlng Fig．4．11EmergencyOperation（Clockwise

wheelis harder to turn thanin normal

Rotation）

OPeration．

−114−

4．STEERLNG SYSTEM

（5）Centerspringoperation WhenthesteerlngWheelisturned，thecenterlngSPrlnglSCOmPreSSedcorrespondingtotheclearance

betweenthecrossplnandspool・WhenthesteerlngWheelisreleasedorlocked，thesleeveisrota thecenterlngSPrlngtenSiontoreturnthesteerlngWheeltoneutral．Theloadercontinuestoturnatits

turnlngangleuntilthesteerlngWheelisoperatedagain．Thus，thecenterlngSPrlngtenSionactsasfte

OfthesteerlngmeChanism． （6）Pportcheckvalveoperation Theorbitrol sPporthasacheckvalveinstalled． Thecheckvalveoperatesasfollows： WhenthesteerlngWheelisturnedclockwiseandthesteerlngCylinderreachesitsstrokeend，the

PreSSureattheRportoftheorbitrolrisestothesettingvalue．Whenyourhandisreleasedfromthe

SteerlngWheelatthispolnt，theentiresystemreturnstoneutral，buthighpressureoilremainsattheR

POrtbecausethecylinderportsideisblocked． WhenthesteerlngWheelisthenturnedslowlytotheclockwisedirection，theRportoftheorbitroiis

COnneCtedthroughtherotortothePport．Therotorturnsmomentarilyduetotheresidualpressureatthe

RporttolettheoilflowbacktothePport・ Therotorismechanica11ylinkedtothesteerlngWheelandthusthesteerlngWheeltriestoturninthe

direction（COunterClockwise）oppositetothedirectionyouwanttoturn．Topreventthisfromhappeni

acheckvalveisinstalledatthePportoftheorbitrol．

−115−

4．STEERING SYSTEM

4．5 PR10RITYVALVE TheprlOrltyValvecombineswiththeorbitroltoformtheloadsenslngSySteminwhichboththe

SteerlngSyStemandthehydraulicsystemcanbeefficientlydrivenbyaslnglepump・ TheprlOrltyValveisprovidedwithareliefvalveforthesteerlnghydrauliccircuit・

CF

EF

13＜＝項

Sectionalview A−A

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

LS CF EF

B＞ぢ＝コ44・1N−m（4・5kgf−m）［32・51bf−ft］

P：Pumpport（fromMAINPUMP） T：Tankport（toOILTANK） LS：Loadsensingport（fromORBITROL）

EF：Maincircuitport（toCONTROLVALVE） CF：Steeringcircuitport（toORBITROL）

1．HOUSING 2．SPOOL 3．SPRING 4toll．RELIEFVALVE 4，SCREEN

（Circuitdiagram）

5．RING 6．VALVESEAT

10．SPRINGGUIDE

7．BODY 8．POPPET 9．SPRING

12．PLUG 13．PLUG

ll．ADJUSTMENTSCREW

Fig．4．12 PriorityValve

−116−

4．STEERING SYSTEM

LoadsenslngValveoperation

Theloadsensingsystemletsonlytheamountofoil（OutOfthedischargedfromthemainpu necessaryforsteeringoperationflowintotheorbitrol，WhilelettlngalltheremainlngOilflowintothe loadhandlingsystem（COntrOIvalve）・

Forexample，WhenthesteerlngWheelisinneutral，mOStOftheoildischargedfromthemainpu directedtothecontroIvalvefortheoperationoftheloadhandlingsystem・

Thisallowsefficientuseoftheoildischargedfromthemainpump，thusmakingthehydra mOreenergy−SaVlng・

（1）Steeringwheelinneutral（enginenotrunning）

Whentheengineisnotrunning，thepriorityvalvespool（1）ispressedtotheleftinthefigu controIspring（2）tension，thuskeepingtheCFportfu11yopenandtheEFportfullyclosed・

Fig．4．13 SteeringWheelinNeutral（enginenotrunning） −117−

4．STEERING SYSTEM

（2）Steeringwheelinneutral（enginerunning）

① ThepressureoilfromthemainpumpflowsthroughthePportofthepriorityvalveandthenbranch

② ThepressureoilfromtheCFportisblockedoffbytheorbitrolandthusflowsthroughthethrott ClandC2tOthechambers AandB．

③ ThepressureoilinthechamberBflows，PaSSingthroughtheLSportandorbitrol，tOthehydra OiltanksothattheoilpressureinthechamberBbecomeslowerthantheoilpressureinthechamber AthankstothethrottleC2．IfthepressuredifferentialexceedsthecontroIsprlngPreSSureOfthe SPring（2），thespool（1）movestotheright．

④ TheEFportofthepriorityvalveopensfullywhiletheCFportopensslightly．Forthisreason， almostallthe．oildischargedfromthemainpumpflowstothecontroIvalvefordrivlngtheload

handlingmeans．

Fig．4．14 SteeringWheelinNeutral（enginerunning） −118−

4，STEERING SYSTEM

（3）Steeringwheelinrotation

① Whenthesteeringwheelisturnedfromneutralstate，theoilpassagesintheorbitrolarecha oversothatthepressureoilinthechamberAandCFportoftheprlOrltyValvepassesthrough throttleC4intotheGerotor．

② Theoilpressur占inthechamberAdropsasthepressureoilenterstheGerotorandthusthespool（1）

oftheprlOrltyValvemovestoapositionwhichattainabalancebetweenthepressuredifferential

betweenthechambersAandBandthecontroIspring（2）force．Thisdeterminestheflowrati oildischargedfromthemainpumpbetweentheCFportandtheEFport・ ③ TheopeningofthethrottleC4insidetheorbitrolisdeterminedbytherotatingspeedofthesteering

wheel．Thatis，thequickerthesteerlngWheelisturned，thelargertheopenlngbecomes；theslo thesteerlngWheelisturned，thesmallertheopenlngreSults・Therefore，WhenthesteerlngWhee turnedquickly，mOreOilisdirectedtotheCFport，thusquickeningsteerlngSPeed・

GEROTOR

Fig・4・15 SteerlngWheelinRotation −119−

4，STEERING SYSTEM

（4）Steeringwheelatstrokeend

① ThepressureoilthatreachedtheGerotorflows，PaSSingthroughtheLSportandthrottleC30ft PrlOrltyValve，intothechamberB・

② whenthesteeringwheelisfurtherturnedandthesteeringcylinderreachesitsstroke pressureinthechamberBoftheprlOrltyValverisestogetherwiththecircultPreSSure・Whentheoil pressureinthechamberBreaches17・2MPa（175kgf／cm2）【2495psi］，thereliefvalve（3）ofthe prlOrltyValveoperatestoreducetheoilpressureinthechamberB・

③ WhentheoilpressureinthechamberBdrops，aPreSSuredifferentialisproducedbetweenthe chambersAandBbythethrottleC2・WhenthepressuredifferentialovercomesthecontroIsprln pressureofthespring（2），thespool（1）ofthepriorityvalvemovestotheright・

④ Therefore，theEFportofthepriorityvalveopensfullywhiletheCFportopensslightlyandthu almost・alltheoildischargedfromthemainpumpflowstothecontroIvalve・

Fig．4．16 SteerlngCylinderatStrokeEnd −120一

4．STEERING SYSTEM

4．6 STEERING CYLINDER

Twodouble−aCtlngSteerlngCylindersareused・Eachpistonrodandcylindertubeareconnect thefrontframeandrearframe，reSPeCtively・TheloaderissteeredbythepIStOnrOdextendinga retracting．

1

臣臣り臣臣

臣匪臣防除

e t O N

304N−m（31kgf−m†【2241bf−ft］，紹＝ゝThreadedarea：ThreeBond＃1901 613N−m（62．5kgf−m）［4521bf−ft］

6．9N−m（0．7kgf−m）【5．11bf−ft］（Aftertightening，Calktwoparts・） 76．4±3．8N−m（7．8±0．4kgf−m）［56．3±2・81bf−ft］ 17．2±0．9N−m（1．8±0．1kgf−m）［12．3±0・71bf−ft］

匪＞Pressurecheckport（PTl／8） 1．CYLINDERHEAD

7．＝U −RING

2． 0 −RING

8．PISTONROD 9．CYLINDERTUBE lO．SLIDERING

3．BACK−UPRING 4．㍑0 −RING

5．WIPERRING 6．BUSHING

11．SEALRING，㍑0

−RING

12．PISTON Fig．4．17 SteerlngCylinder −121−

13．SET SCREW 14．STEELBALL 15．SPHERICALBEARING 16．WIPERRING 17．PLUG

4．STEERING SYSTEM

NOTE

−122−

5．FRAMEAND COCKPIT

5．FRAMEANDCOCKP［T

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

ADonottrytomo嘩theROPS（RoII・OVerPrOteCtionstructure），ifmounted，withoutpr PermissionfromthemanufactureIIIftheROPSshouldgetdamagedordeformedduetoturnlng

OVerOrCOllision，itisadvisab）etoreplaceitwithanewone，becauseadamagedordefor

ROPShasalowstructuralstrength．

−123−

5．FRAME AND COCKPIT

Note：The sketches show the balance WeightoftheL13−3andLX70−7．The

balance weight ofthe L16−3and LX80−7hasthesamedesign．

Note：D＞ぢ＝＝コ452N−m（46kgf−m）［3331bf−ft］forL13−3，LX70−7 782N−m（80kgf−m）［5791bf−ft］forL16−3，LX80−7 1．（REARFRAME） 2・BALANCEWEIGHT：613kg［13521bs］forL13−3，LX70−7

1126kg［24831bs］forL16−3，LX80−7 Fig．5．1BalanceWeight

−124−

5．FRAMEAND COCKPIT

Note：B＞6：：：＝コ665N−m（68kgf−m）［4921bf−ft］forL13−3，LX70−7 980N−m（100kgf−m）［7231bf−ft］forL16−3，LX80−7 Note：The sketches show the balance

1．（REARFRAME）

WeightoftheL13−3andLX70−7・The

2．STANDARDBALANCEWEIGHT 3．ADDITIONALWEIGHT

balance weight ofthe L16−3and

LX80−7hasthesamedesign．

Additionalweight（kg［1bs］） HEAVY

2ND

L13−3，LX70−7

501［1105］

329［725］

L16−3，LX80−7

627［1383］

257［567】

Fig．5．2 AdditionalWeight（Option）

−125−

5．FRAME AND COCKPIT

5．2 CENTER HINGE PIN Theloaderisaframe−articulatedtype：thefrontframelSJOinedtotherearframewithtwohingeplnS aroundwhichtheloaderpIVOtSforsteerlng．

Awhenloaderissteered，theareanearthecenter hingepinsbecomessonarrowthatyoumightget

Caughtbetweenthefrontandrearframes．Before

tryingtoservicetheloader，makesuretosetthe Safbtylink．Priortomoving（traveling）theloader；

make surethesafetylinkissettotheorlglnal

POSition．

Fig．5．3 SafetyLink

−126−

5．FRAMEAND COCKPIT

Upperhinge

SeCtion

Detai10farea A

Lowerhingesection

Note：B＞l⊂＝：恥Innersurface‥Grease（beforeinstallingpin） B＞ぢ：：：＝コ34・3±2・9N−m（3・5±0・3kgf−m）【25・3±2・171bf−ft］

匪＞￠E：コ548・8±39・2N−m†56・0±4・Okgf−m）［405・0±28・91bf−ft］

R＞血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．5．4 CenterHingePin（L13−3，LX70，7） −127−

11．CAP 12．BUSHING 13．COLLAR 14．RUBBER

5．FRAME AND COCKPIT

Upperhingesection

Detai10fareaA

Lowerhingesection

Note：B＞忙＝⊃弘Innersurface：Grease（beforeinsta11ingpin） 匪＞ぢ：：：：コ62・6±3・8N−m（6・4±0・4kgf−m）【46・3±2・911bf−ft］

B＞ぢ＝：：コ548・8±39・2N−m（56・0±4・Okgf−m）［405・0±28・91bf−ft］

B＞超＝ゝThreadedarea：LOCTITE＃262 1．UPPERHINGEPIN

6．COLLAR

11．CAP

2．BUSHING

7．SHIM

12．BUSHING

3．BUSHING

8．FLANGE

4．GREASEFITTING 5．LOWERHINGEPIN

13．COLLAR 14．RUBBER

lO．DUSTSEAL

9．U−NUT

Fig．5．5 CenterHingePin（L16−3，LX80−7） −128−

6．HYDRAULIC SYSTEM

6．HYDRAUL］CSYSTEM Thehydraulicsystemusesthemainpumpasitspowersourceandchangesoveroilflowswiththe COntrOIvalveaccordingtotheworkyouwanttodo．

Thehydraulicsystemconsistsofamainpump，COntrOIvalve，ValvecontroIs，Oiltank，andhydraul plplng・

6．101LCIRCULAT10N ROUTES

Thehydrauliccircuitoftheloaderconsistsofthemainhydrauliccircuit，Steerlnghydrauliccircu andHSThydrauliccircuit． Forthesteeringhydrauliccircuit，referto FortheHSThydrauliccircuit，referto

4・STEERINGSYSTEM

（4・2）・

2・1HSTUNIT・

Main hydraulic circuit TheoilpickedupfromtheoiltankbythemainpumpisdirectedtotheprlOrltyValvewhereitis dividedintotwoportions：Oneforthemainhydrauliccircuitandtheotherforthesteerlnghydraulic

circuit・TheoildividedforthemainhydrauliccircuitisroutedintothecontroIvalve・Whenthecontro

Valveisinneutral，theoilpassesthroughthecontroIvalvebacktotheoiltank・ Whentheloadhandlinglever（contro11ever）isoperatedandthecontroIvalvespoolmoves，t

flowsthroughtheoilpassagechoseninsidethevalvetothecylinder・Theoildischargedfromthecylinde returns，PaSSlngthroughthecontroIvalve，intotheoiltank・

Theoiltankhasareturnfilterinsideit．

−129−

（Emptypage）

−130−

6．HYDRAULLCSYSTEM

唾由1

Fig・6・1HydraulicCircuitDiagram −131−

（Emptypage）

ー132−

6．HYDRAULIC SYSTEM

6．2 PUMP L13−3，LX70・7

L柑−3，LX80−7．

Model

56・20・11R680

60・20・11R681

Type

Geartype

←

Drive

（insta11edonHSTpump）

←

Discharge

122L［28．57U．S．gal．］／min

141L［37．25U．S．gal．］／min

（2300rpm，1．47MPa

（2450rpm，1．47MPa

‡15kg打cm2）【213psi］）

†15kgfソcm2）［213psi］）

19．5kg［43．001bs］

20．8kg［45．861bs］

Main pump

Ⅵねight

（includingHSTchargingpump

andT／Mchargingpump） Steering pump

Usedincommonwithmainpump

（includingHSTchargingpump

andT／Mchargingpump） ←

HSTcharglngPumP

Type Drive

Discharge

Geartype Connectedtotherearofmainpump

← ←

44L［11．62U．S．gal．］／min

47L［12．42U．S．gal．J／min

（2300rpm，3．9MPa

（2450rpm，3．9MPa

（40kgf／cm2）［569psi］）

（40kgf／cm2）［569psi］）

甘ansmissionchargingpump （Brakeassist）

Type

Geartype

Drive

Connectedtotherearof

← ←

HSTcharglngPumP Discharge

24L［6．34U．S．gal．］／min

26L［6．87U．S．gal．］／min

（2300rpm，1．77MPa

（2450rpm，1．77MPa

（18kgf／cm2）［256psi］）

−133−

（18kgf／cm2）【256psi］）

6．HYDRAULIC SYSTEM

Theloaderusesthreepumps：mainpump（Steeringpump），HSTchargingpumpandtransmission Chargingpump（brakeassist）・

TheHSTpumpunithastriplepumpsatitsrearside：ThefirstpumpISuSedasthemainpump，

secondpumpastheHSTcharglngPumPandthethirdpumpasthetransmissioncharglngPumP・ SincethedrivegearofthetriplepumpsiscoupledtotheHSTpumpunitdriveshaft，italwaysrotates astheenglnerunS・

（HSTPUMP）

﹇起腔止

Note：B＞ぢ＝コ91・2±18N−m（9・3±1・8kgf−m）【67・3±13・01bf−ft］

Fig．6．2 Pumps

ー134−

6．HYDRAULIC SYSTEM

DISCHARGE SIDE

SUCTLON SIDE

DLRECTION OF ROTATlON

＿．−＝＝−−＝二ゝ

1．MAIN／STEERINGPUMP

2．HSTCHARGINGPUMP 3．TRANSMISSIONCHARGING／BRAKEPUMP

Fig．6．3 Three−WayPumps −135−

6．HYDRAULLCSYSTEM

17

1．DRIVEGEAR

8．COUPLING

15．REARCOVER

2．OILSEAL

9．ADAPTERPLATE

16．FRONTCOVER

3．BODY

lO．ADAPTER

17．DRIVENGEAR

4．SIDEPLATE 5．ADAPTERPLATE

ll．OILSEAL

18．DRIVENGEAR

12．BODY 13．DRIVEGEAR

19．DRIVENGEAR

6．BODY 7．DRIVEGEAR

14．SIDEPLATE

Fig．6．4 StructureofTriplePumps

−136−

6．HYDRAULIC SYSTEM

6．3 CONTROLVALVE Model

KVS−120H−2

Type

Parallelcircuitl），2−SPOOIslidingtypewithreliefvalve

Mainreliefpressuresettlng

20．6MPa（210kgf／cm2）［2987psi］

Portreliefpressuresettlng

16．2MPa（165kgf／cm2）［2347psi］

（atbucketcylinderrodside）

Weight

21kg【46．31bs］

Note：Thetwo−WayValvehasaparallelcircuit；thethree−WayValvehasatandemcircuit；thefour−W

Valvehasatwintandemcircuitplusatwinparallelcircuit・（Ifyouwanttoincreasethenu Ofports，rePlacethevalveassemblywithanewone．） 6．3．1GENERAL DESCRIPT10N

ThecontroIvalveisastacked，2−SPOOIslidingtype，COnSistlngOftheinletsection，tWOSPOOIsections，

andoutletsection． Note：ForthecontroIvalveinstallation，SeeFig．6．21．

（1）RelierValve

ThecontroIvalveisprovidedwithareliefvalvethatservestoprotectthe entirehydrauliccircuito

theloadhandlingsystemwhilecontrollingtheoperationpressure・Thecylinderportleadingto bucketcylinderrodsideisnttedwithaportreliefvalvewhichrelievesthepressureoilwhenthecylinder

receivesaloadheavyenoughtoletthepressureatthecylinderportrisebeyondthespecifiedvalue，thus

PrOteCtlngthecylinderandthepIPlng・

（2）Detentmechanism

① Theboomspoolhasamechanicaldetentatthepositionwhereitisfu11ypulledout（boomfloati Stage）．

② Thebucketspoolhasanelectromagneticdetentatthepositionwhereisfullypushedin（bucke

roll−backstage）．Thedetentscomposethebucketleveleranddonotfunctionwhenthebucke

therangefromleveltoroll−backposition．

−137−

6．HYDRAULIC SYSTEM

ParaLIelcircuit

Note：B＞ぢ：：：：：コ（2points）65N−m B2

（6．6k〆−m）［481bf一明

A2

匪＞6：＝：コ101N−m（10・3kgf−m） BI

［741bf一氏］

Al

R＞ぢ＝コ78to88N−m（8to9kgf−m） ［58to651bf一札］

＝D．C．24V

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

5．OUTLETSECTION 6．SPOOLSECTION（BOOM）

Fig．6．5 ControIValve

一138−

6．HYDRAULIC SYSTEM

（Bucket）

2．WIPER

5．CAP 6．SPRING

3．SEAL 4．VALVEHOUSING

7．PIN 8．PLATE

1．SPOOL

9．COILTUBEASSEMBLY lO．CHECKVALVESPRING ll．CHECKVALVEPOPPET

（Boom）

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

11．DETENTSPACER

6．DETENTPIN 7．DETENTSPRING 8．CAP 9．DETENTSLEEVE lO．STEELBALL

12．SHIM（t＝0．5mm［0．02in．］）

13．CHECKVALVESPRING 14．CHECKVALVEPOPPET

Fig．6．6 SpooISection −139−

6．HYDRAUuC SYSTEM

6．3．2 0PERAT］ON Whenthecontrolleverisactuated，theoilpassagesareswitchedoverbythespooIsslidingsothatthe

PreSSureOilfromtheprlOrltyValveisselectivelysenttothebucketorboomcylinder・ Theboom

s＝float

positionandthebucket，sHroll−back

thecontro11everisplacedinthe＝floatMorりroll−back

positionhaveadetentmechanism．Whe

，thedetentmechanismkeepstheleverposit

thatthespooldoesnotreturntoneutralifyourhandisremovedfromthelever．Thecontrollever

automaticallyreturnstoneutralfromoperatlngPOSitionsthan‖float＝and＝roll−backMwhenyourha removedfromthelever．

1．ControIvalveinneutral ① WhenthespooIsofthebucketspooIsectionandtheboomspooIs占ctionareinneutral，boththe CylinderportsA（rodside）andB（tailside）areclosedbythespool．

② ThepressureoilwhichhasreachedthecontroIvalveflowsthroughtheinletsection，PaSttheneutral OilpassagesinthebucketspooIsectionandtheboomspooIsection，tOtheoutletsectionfrom Whichitisdirectedtothelow−PreSSureOilpassageandleavesthecontroIvalvethroughtheinlet SeCtion．

Note：ThesketchshowsatypICalKVSseriesvalve・Theactualvalveusedforyourloadermayhavea Slightlydifferentshape．

Fig・6・7 ControIValveinNeutral（BucketSpooISection）

−140−

6．HYDRAULIC SYSTEM

2．Bucketspooloperation （1）Roll・back

① Whenthecontrolleverisplacedinthe roll−back position，thebucketspoolmovesinthedirect indicatedbythearrow． ② Theneutraloilpassageisclosedbythespoolandthepressureoilpushesopentheloadcheckva toflowtothecylinderport（Bl）fromwhichitisdirectedintothebucketcylindertail・

③ Theoildischargedfromthebucketcylinderrodsideflowsthroughthecylinderport（Al）to low−PreSSureOilpassageandbacktotheoiltank・

■◆ Roll−back

Fig．6．8 BucketinRoll−back

（2）Dump ① Whenthecontro11everisplacedinthe

dump

position，thebucketspoolmovesinthedirec

indicatedbythearrow． ② Theneutraloilpassageisclosedbythespoolandthepressureoilpushesopentheloadcheckva toflowtothecylinderport（Al）fromwhichitisdirectedintothebucketcylinderrodside・

③ Theoildischargedfromthebucketcylindertailsideflowsthroughthecylinderport（Bl）t low−preSSureOilpassage・

Fig．6．9 BucketinDump −141−

6．HYDRAULIC SYSTEM

3．Boomspooloperation （1）Raiseanddown TheoilpassageintheboomspooIsectionisidenticalwiththatofthebucketspooIsection・Therefore，

boomraislngOPerationisidenticalwithbucketroll−backoperationwhereasboomlowerlngOPerationis identicalwithbucketdumpoperation・Forthedetailsofboomoperation，Seethepertinentsectionsof bucketoperation・ （2）Float

① Whenthecontrolleverisfurtherpusheddownfromthe

Down

positiontothe

Float

position，

theboomspoolmovesasindicatedintheillustration・

② Duetothismotiontheneutralpassageisopened．Thepressureoilflowsasinneutralposition ③ Thecylinderports（A2）and（B2）areconnectedtothelowpressureoilpassage・Asaresult，the

boomsfloatoverthegroundsurfaceaccordingtoitsirregularities・Theoildischargedfrom boomcylinderrodsideissenttothetailsideandtheoilforcedoutfromitstailsideissenttothe rodsiderespectivelythroughthelowpressureoilpassageinthecontroIvalve・

Fig．6．10 BoominFloatlng

−142−

6．HYDRAULIC SYSTEM

4．Detentoperation （1）Boomside

① Whenthecontrolleverispusheddownfullyto the Float position，theboomspool（1）ispulled outfu11y．Duetothis，thedetentpin（2）fittedto

thespoolendisalsopulledout，andthedetent balls（3）fa11intothegrooveofdetentsleeve（4）・

② sincethedetentballsarepushedbythedetent SPring（5），theboomspoolholdsitsposition，and thedetentbecomesoperative・

③ Toreleasethedetent，Pullthecontrolleverto disengagethedetentball・

Fig・6・11BoomSideDetentinOperation （2）BucketSide

① Theelectromagneticdetentisusedatthebucketside・Theelectricalcircuitisconnectedfromthe batterytotheproximltySWitchofthebucketlevelerthroughthecoilassemblyofthebucketspooI SeCtlOn．

② whenthebucketistiltedforward，theproximityswitchiskeptclosedsothatthecoilassembly（4） isexcited．

③ Whenthecontrolleverispulledoutfu11ytothe Roll−back position，thebucketspool（1）isfu11y

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

④ Toreleasethedetent，OPentheproximityswitchtode−energizethecoilassemblyoroperat COntrOlleverbyhand・

1

2

3

Fig．6．12 BucketSideDetentinOperation

−143−

6．HYDRAULIC SYSTEM

6，3．3 RELIEFVALNE

l．Mainreliervalve Themainreliefvalveislocatedbetweentheneutraloilpassageandthelow−PreSSureOilpassage （returnoilpassage）intheinletsectioh．

Operation （1）Ininoperativestate Thepressureoilinthehigh−PreSSureOilpassage

（HP）flowsthroughthethrottlehole（2）inthemain POPPet（1）tofi11theinternalcavity（3）．

Owing to the differencein areaon 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）

−144−

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）toseat・Closelyduetothedifferenceinareaonwhich oil pressure acts.

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

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

Thepressureoilflows，PaSSlngthroughthepilot 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）

−145−

6．HYDRAULIC SYSTEM

（4）Operation（C） Apressuredifferentialisproducedacrosstherelief Valvepoppet（3）tomovethereliefvalvepoppet． Therefore，thepressureoilatthecylinderport（HP）

flowsdirectlylntOthelow−PreSSureOilpassage．

Fig・6．19 0peration（C） （5）SllCtion

Ifthepressureatthecylinderport（HP）islower

LP

2

thanthepressureatthelow−PreSSureOilpassagedue totheoccurrenceofcavitation，thecheckvalvepoppet movesduetothedifferenceinareaonwhichnegative PreSSureaCtSaCrOSSthecheckvalvepoppet（2）．

Therefore，Oilisdeliveredfromthelow−PreSSure

Oilpassagetothecylinderport（HP）toremovethe CaVitation．

Fig．6．20 Suction

ー146−

6．HYDRAULIC SYSTEM

6．4 VALVE CONTROLS

ThevalvecontroIsystemisasinglelevertype・WhenthecontrolleverismanlPulated，theco

valvespooIsareoperatedbythecables；ShiftingtheleverbackandforthwillactuatetheboomspooI whileshiftingthel冒VerSidewayswillactuatethebucketspool・

AAsasafbtydeviceforthevalvecontroIsystem，aStOPPerlinkisprovided・Usethestopperlin

tolockthecontroIvalveinneutralwhentheloadhandlingsystemdoesnotneedtobeused・

−147−

6．HYDRAULIC SYSTEM

4 5 6

軸

Note： 。

＼ミ㍉ト革

B＞l⊂＝恥Beforeassembly，aPPlygrease・ R＞Adjusttheleversothatthebolthead COntaCtSthestopperatthestrokeend・

1．KNOB（QSS

incorporated） 2．BOOT 3．COVER 4．CONTROLBOX 5．PLATE 6．CONTROLVALVE

7．BRACKET 8．CONTROLLEVER

14．STOPPERLINK 15．SPRING

9．BUSHING lO．PIN

16．HANDLE（LEVERSTOPPER）

ll．BUSHING

18．CABLE（FORBUCKET）

12．BOSS

19．CABLE（FORBOOM）

17．BALLLINK

13．BRACKET

Fig．6．21ValveControIs −148−

6．HYDRAULIC SYSTEM

6．5 01LTANK Type

Pressurized−Closedtype

Tank capacity

50L［13．2U．S．gal．］ Positivepressure：46to54kPa（0・47toO・55kgf／cm2）

AirbreatheroperatlngPreSSure

［6．68to7．82psi］

Negativepressure：4to5kPa（0・04toO・05kgf／cm2） ［0．57toO．71psi］ 1pc．（10いm）

Returnfilter

Theoiltankholdshydraulicoilusedforthemainhydrauliccircuitandthesteerlnghydrauliccircuit Itisbolted、tOtherearframe．

Theoiltankhasareturnfilterinsideit．

1．RETURNFILTER 2．BREATHER 3．0ILTANK 4．VIEWGAUGE 5．SUCTIONFIIJER 6．（REARFRAME）

1「 r「二＝二＝モ≡≡：≡］

l

l】 ／′・

「「−−＼ →・・

F：≡ご

睦l

＼

璃

6

Il

ノーー

ーーーー 【、・−−−−・／一￣￣￣￣㍗￣￣￣￣−◆一

］

Note：巨＞（忘＝＝コ12・7N−m（1・3kgf−m）［9・41bf−ft］，14＝ゝThreadedarea：LOCTITE＃262 B＞ぢ＝コ245N−m（25kgf−m）【1811bf−ft］（Makesuretheoiltankrestsontheframe Surfacewheninstalling．） Fig．6．22 0ilTank −149−

stop

6．HYDRAULIC SYSTEM

N OTE

ー150一

7．LOAD HANDLING SYSTEM

7．LOADHANDLINGSYSTEM Theloadhandlingsystemisoperatedbyhydrauliccylindersandisusedfordigglng，loadingand unloading，andtransportlngloads・

ThelinkageemployedfortheloadingsystemisaninverseZ−Shapetypewhichissimplerindesign

andproducesmorepowerfulbucketbreak−Outforcethantheduplextypeandothers・

Fig．7．1LoadHandlingSystem

−151−

7．LOAD HANDuNG SYSTEM

7．1BOOM，BELLCRANK，ANDBUCKET

Linkage Bucket

Bucketcapaclty，heaped

L13−3，LX70−7

Ll ・3，LX80・7

Z−Shape DEB，Itype

← ←

1．3m3［1．7y3］

1．6m3【2．1y3］

Bucketleveler

Provided（non−COntaCttyPe）

←

Boom kickout

Not provided

←

Weight

Booms（perpiece）

470kg［10361bs］

575kg［12681bs］

Bellcrank

83kg［1831bs］

110kg［2431bs】

Pushrod

25kg【551bs］

38kg［841bs］

534kg［11771bs］

710kg［15661bs］

Bucket（w／doubleedge）

7，1．1GENERALDESCRIPT10N

Theloadhandlingsystemconsistsofbooms，bellcrank，PuShrod，bucket，bucketcyli cylinders，andpinsusedforsecurlngthosecomponents・Thebucketlevelerhelpsprovideefficientloa

handlingoperation・AllconnectingplnSOftheloadhandlingsystemhavedustsealstopreventth

entranceofwater，mud，Ordustintothesystem・Inaddition，the3connectingplnSforthebuck PrOVidedwith 0 −rings・

AllconnectlngPlnSareSeCuredwithlockbolts・

（Fig．7．2Partnames）

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

7．SPACER

11．BUSHING 12．DUSTSEAL

8．BOOMCYLINDER

13． 0 −RING

9．PIN lO．GREASEFITTING

14．LOCKBOI＿J

6．FRONTFRAME

−152−

7．LOAD HANDLING SYSTEM

3、

痢

／

︑い叫 ト．

、、、、 ・ごノ＿・

，や、 ミ

＼

Structureof

（Bucketpins）

Note：B＞l⊂＝恥Allpins，bushingsandbosses：Grease（applybeforeinstallingpins） 駐＞Dustsealsmustbeinstalledwithlipfacingoutward・

Fig．7．2 Boom，Bellcrank，andBucket（1） t153−

7．LOAD HANDLING SYSTEM

Installingbucketstoppers

Dump stopper

A L13−3，LX70−7 54mm［2．13in．］ L16−3，LX80−7

L13−3，LX70−7

L16−3，LX80−7

58mm［2．28in．］

B

C

26mm

460mm

【1．02in．】

［18．1in．］

38mm

495mm

［1．50in．］

［19．5in．】

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

Installingbucketpins ■．−1．

﹁．1．t．︼．

﹁．︼． ■．1．﹂ L

−．−．﹂

① Set 0 −ringsbetweenthebucketandbooms （2points）andbetweenthebucketandpushrod beforeinstallingthebucket，boomsandpush

一 ﹂

rod．

② Afterinstallingthebucket，boomsandpushrod， applygreaseonthewholeperipheryoftheareas markedwith※andinstallthe grOOVeS・

Fig．7．3 Boom，Bellcrank，andBucket（2） −154−

0

−ringsinthe

7．LOAD HANDL［NG SYSTEM

7．1．2 BUCKET

Thedouble−edgedbucketisstandard・Inadditiontothestandardtype，tyPe11ightbucketandtype3 bucketarealsooptlOnallyavailable・

Thebucketshouldbeselectedwithduecare，COnSideringtheconditionofjobsites，thenatu loadstobehandled，andtheoperatlngCOndition・Awrongbucketwillcauseaninefficientoperationan maycausethemalfunctionoftheloadhandlingsystemaswell・ （Double・edgedbucket：DEB）

Note：D＞ぢ：：＝コ1070N−m（109kgf−m）［7881bf−ft］

（Type3bucket，B3）

Fig．7．4 Bucket −155−

7．LOAD HANDLING SYSTEM

7．1．3 BUCKET LEVELER Whenthecontrolleverisputinthe山roll−back

positionafterdumplngthebucket，thebucketlevel

automaticallyreturnsthecontro11evertoneutralwhenthebucketbecomeslevel，keeplngthebucket level．

Operation

① Asthecylinderrodofthebucketcylinderisextendedandthebucketisrolledback，thelevele leavesthesenslngSurfaceoftheproximltySWitch，SOthattheelectriccircuitisopened・

② TheproximityswitchisconnectedtothesolenoiddetentcoilofthecontroIvalvebucketsecti Thesolenoiddetentisthusreleasedtoletthecontrolleverreturntoneutral，StOPPlngtherolling

backoperationofthebucket・

Note：Thebucketroll−backphaseofthecontroIvalveusesasolenoiddetentmechanism・Whenth bucketisrolledbackbeyondthehorizontalline，nOfurtherelectricltyWillflowtothesolenoid detentcoilsothatthedetentmechanismwon

twork．

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

Fig．7．5 BucketLeveler

−156−

7．LOAD HANDLING SYSTEM

7．1．4BOOMK［CKOUT（OPT10N）

Theboomkickoutdevicestopstheboomsatapresetheightduringtheliftingphase・Withtheco

leverintheboomraiseposition，theboomkickoutdeviceautomaticallyreturnsthecontrolleverin

neutralwhentheboomsareraisedtothatpresetheight，thusstopplngtheliftingoperationofthebooms Operation

① Whentheboomsareraisedtoapresetheight，thelevelplateinstalledononeoftheboomsleave

thesenslngSurfaceoftheproximltySWitch，SOthattheelectriccircuitisopened・ ② TheproximityswitchiswiredtothesolenoiddetentcoilofthecontroIvalveboomsection・Th

solenoiddetentisthusreleasedtoreturnthecontrollevertoneutral，thusstopplngtheliftingoperation ofthebooms．

Note：ThecontroIvalveoftrucksequlPPedwithaboomkickoutdeviceisdifferentfromthatofthe standardloader．

／ソ

／

Note：Theaboveisaroughsketchoftheboomkickoutdevice・Itmightbedifferentfromtheactua boomkickoutdevice． 1．PROXIMITYSWITCH 2．BRACKET 3．LEVELPLATE

4．WIRING 5．CONTROLVALVE 6．BOOM Fig．7．6 BoomKickoutDevice −157−

7．FRONTFRAME

7，LOAD HANDL［NG SYSTEM

7．2 CYLINDERS L13・3，LX70−7

Ll ・3，LX80−7

Type

Double−aCtlngPIStOn

←

Q ty

2

←

Boom cylinder

Innerdiameter

90mm［3．54in．］

110mm［4．33in．】

Cylinder rod diameter

55mm［2．17in．］

60mm【2．36in．］

Cylinderstroke

760mm［29．9in．］

681mm［26．8in．］

56kg［1231bs］

68kg［1501bs］

Weight（PerCylinder） 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［16．5in．］

431mm［17．Oin．］

61kg［1351bs］

88kg［1941bs］

Ⅵねight

7．2．1BOOM CYLINDER

Twodouble−aCtlngPIStOntyPeboomcylindersareused・Whentheboomcylindersareextendedo retracted，theboomsareraisedorlowered，rOCkingaroundtheconnectlngPlnateaChcylindertail・ Theboomcylinderconsistsofacylindertube，Cylinderhead，Pistonrod，Pistonandpackings・ 7．2．2 BUCKETCYLINDER

Thebucketcylinderisadouble−aCtlngPIStOntyPe・Asthebucketcylinderisextendedorretracted，

thebucketisdumpedorro11edbackthroughthebe11crankandpushrod・ Thebucketcylinderconsistsofacylindertube，Cylinderhead，Pistonrod，Pistonandpackings・

−158−

7．LOAD HANDLING SYSTEM

10 1112＜司

l

￣−￣￣「

Detail of inside

】 1

14

1516

り臣りり臣

臣匪匪匪臣

e t O N

530N−m（54kgf−m）［3911bf−ft］，ペ⊂ゝThreadedarea‥ThreeBond＃1901 1320N−m‡135kgf−m）［9761bf−ft］

16．2N−m（1．65kgf−m）［11．91bf−ft］（Aftertightening，Calktwoparts・） 128±6．4N−m（13±0．65kgf−m）［94・0±4・71bf−ft］ 17．2±0．9N−m（1．76±0．09kgf−m）［12．7±0・651bf−ft］

1．CYLINDERHEAD 2． 0 −RING 3．BACK−UPRING 4．＝0 一RING

5．WIPERRING 6．BUSHING

7．URING 8．PISTONROD 9．CYLINDERTUBE 10．SLIDERING ll．SEALRING，

13．SET SCREW 14．STEELBALL 15．PINBUSHING 0

−RING

12．PISTON

Fig．7．7 BoomCylinder（L13−3，LX70−7）

−159−

16．WIPERRING 17．PIPE

7．LOAD HANDLING SYSTEM

l

1

15

りり臣りり

●

臣匪匪匪臣

●

e t O N

834N−m†85kgf−m）［6151bf−ft］，紹＝ゝThreadedarea：ThreeBond＃1901 2350N−m（240kgf−m）［17361bf−ft］

31．5N−m（3．21kgf−m）【74．51bf−ft］（Aftertightening，Calktwoparts・） 128N−m（13kgf−m）［941bf−ft］ 17．2N−m（1．75kgf−m）［12・71bf−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．SET SCREW 15．STEELBALL 16．PINBUSHING 0

−RING

12．PISTON

Fig．7．8 BoomCylinder（L16−3，LX80−7）

ー160−

17．WIPERRING 18．PIPE

7．LOAD HANDLING SYSTEM

「

＿＿＿＿＿

Note：B＞6：：：：コ834N−m（85・1kgf−m）［6151bf−ft］，正＝ゝThreadedarea：ThreeBond＃1901 B＞ぢ＝：：：：コ2450N−m（250kgf−m）［18081bf−ft］

匪＞6：：：＝コ31・5N−m（3・21kgf−m）【74・51bf−ft］（Aftertightening，Calktwoparts・） 駐＞6：：：：＝コ128±6・4N−m（13±0・65kgf−m）［94±4・71bf−ft］

匡⊃＞Pressurecheckport（PTl／8） B＞ぢ：：＝：コ17・2±0・9N−m（1・76±0・09kgf−m）［12・7±0・651bf−ft］

4． 0 −RING

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

5．WIPERRING

ll．SEALRING，

6．BUSHING

12．PISTON

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

13．NUT 14．SET SCREW 15．STEELBALL 16．PINBUSHING 0

−RING

17．WIPERRING 18．PIPE

Fig．7．9 BucketCylinder（L13−3，LX70−7）

ー161−

7，LOAD HANDLING SYSTEM

…「

： L

Detail of inside

Note：D＞ぢ：：＝コ442N−m（45・1kgf−m）［3261bf−ft］ 医＞ぢ：：：：コ2890N−m‡295kgf−m）［21341bf−ft］ R＞（忘＝コ56・9N−m（5・8kgf−m）［42・01bf−ft］（Aftertightening，Calktwoparts・） B＞ぢ＝コ118N−m（12・Okgf−m）【86・81bf−ft］ B＞Pressurecheckport（PTl／8）

匪＞ぢ＝コ39・8N−m‡4・06kgf−m）［29・41bf−ft］

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

4．WIPERRING 5．BUSHING 6．URING

13．SETSCREW

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

14．STEELBALL 15．PINBUSHING 0

−RING

ll．PISTON 12．NUT Fig．7．10 BucketCylinder（L16−3，LX80−7） −162−

16．WIPERRING 17．PIPE

7，LOAD HANDLING SYSTEM

7，3ANT］・P［TCHINGSYSTEM（APS）［OPT［ON］

Whentravelingathighspeedonbadroads，Pitchingorbounclngmightoccurandusuallythereis needtoslowdown．

TheAPSsuppressespitchingandbounclngOftheloaderbodytomakeitpossibletotravelinasafe andstablemanner．

TRAVELING DAMPER VALVE

CONTROL VALVE

こ令ご こ （TNLS［DE）

領彩淘 Note：The sketch shows the APS fortheL13r3，LX70−7．The APSfortheL16−3，LX80−7is

thesameasabove．

Fig．7．11Anti−PitchingSystem（APS） 一163−

7．LOAD HANDLING SYSTEM

1．Generaldescription TheAPSconsistsbasica11yofanaccumulatorwhichisconnectedtothetailsideoftheboomcylinders WithhydraulicpIPlng，andasolenoidvalvewhichislocatedatthepIPlngtOCOntrOltheoilpassage・ TheAPSisactivatedbyturnlngtheAPSswitchONanddeactivatedbyturnlngtheAPSswitchOFF．

WhentheAPSisactivated，thegasfilledintheaccumulatorworksasasprlngtOa1lowtheloadhandling

SyStemandtheloaderbodytomoveindependently・Thisrelativemotionoftheloaderbodyandthelo handlingsystemdissipatesvibrationenergytosuppresspitchingorbounclngOftheloaderbody，making ltPOSSibletotravelinastablemanneronbadroads．

TheelectricandhydrauliccircuitsofthismechanismconsistprlnCIPallyoftheboomcylinders，

accumulator，traVelingdampervalve，APSswitch，COntrOller（ATCunit），andtravelingspeedsens

2．Operation

①WhentheAPSswitchisturnedON，thetravelingspeedsensorandcontro11erfunctionand monitorlampcomeson． ②Whenthetravelingspeedexceeds7km／h［4．3mph］，thesolenoidvalveinsidethetravelingdamper

Valveisswitchedbythesignalfromthecontroller，tOCOmPletethecircuitbetweenthetailsideof

theboomcylinderandtheaccumulator，thusactivatlngtheAPS・ ③Ifthetravelingspeeddropsbelow5km／h［3．1mph］whiletheAPSisinoperation，APSwillbe deactivated．

④WhiletheAPSswitchisinOFF，theAPSisindeactivatedstate．

Fig．7．12 APSElectricCircuit −164−

7．LOAD HANDLING SYSTEM

ACCUMULATOR

pJ￣￣￣I TRAVELING y…E誌呂。 Fig．7．13 APSHydraulicCircuitandElectricUnit 3．Accumulator

r「 Gascapacity：41iters［244in・3］

Gaschargepressure：2．0±0・1MPa（20±1・Okgf／cm2）［290・1±14・5psi］at20±50C［68±90F］・ Fig．7．14 Accumulator

Acautiontobetakenwhenservicingaccumulatorandpiping ●Usecautionwhenhandlingtheaccumulatorandpipingbecausetheaccumulatorhashigh・ PreSSurenitrogengascharged・

●Fillingnitrogengasintotheaccumulatorshouldbeperformedonlybyqualifiedpersonnel・ ●Donotmodifyorweldtheaccumulator・

●BeforetryingtoservicetheplPlng†makesuretoremovethepressurefrominside

accumulatorusingtravelingdampervalve，becausehydraulicoilremainsinthepiping・（F theprocedure，See㍑4．Travelingdampervalve ・）

●Whenremovlngthepressurefrominsidetheaccumulator）parktheloaderonalevelsurface† shutdowntheenglne，andlowertheboomsandbucketontheground・

●Checkthegaspressureevery2000hoursofoperationoroneyearWhichevercomesfirst・ −165−

7．LOAD HANDLLNG SYSTEM

4．TravelingdamperValve

D −ヒ

Circuit diagram

SectionC−C Note：ぢ：：：：コD：29±1・ON−m（3・0±0・1kgf−m）【21・7±0・71bf−ft］

E：13±0．6N−m（1．3±0．06kgf−m）［9．4±0・41bf−ft］ F：6．9±0．6N−m（0．70±0．06kgf−m）［5．1±0・41bf−ft］ Fig．7．15 TravelingDamperValve（1） ［Removingpressure］

Loosenthelocknut（E）andthenloosenthepoppet（F）toreleasethepressure・

Donotplug（D）asmuchaspossibletopreventdamagetothe replacethe

0

0

−ring・Iftheplug（D）wasloosened

−rlngWithanewone・

［Insta11ing］

①Tightentheplug（D）tothespecifiedtorque・

②Tightenthepoppet（F）tothespecifiedtorquetoseatittothevalvehousingsecurely・ ③Tightenthelocknut（E）tosecurethepoppet（F）・ −166−

7．LOAD HANDLING SYSTEM

23 22 20 21 Sectjon B−B

Section A−A

1．HOUSING

10．PLUG

19．SPACER

2．SPOOL

ll．ADJUSTER

20． 0 −RING

3．SPRING

12．

21．BACK−UPRING

4．PLUG

13．PLUNGER

22．SPRING

5． 0 −RING

14．SPRING

23．POPPET

6． 0 −RING

15．SPOOLSEAT

24．PLUG

7．CAP

16．SPOOL

25．SPOOL

8．SOCKETHEADBOIJ

17．PLUG

26．SPRING

9．SOLENOIDVALVE

18．VALVE

27．PLUG

0

−RING

Fig．7．16 TravelingDamperValve（2）

−167−

7．LOAD HANDLING SYSTEM

N OTE

−168−

8．ELECTR［C SYSTEM

8．ELECTR）C SYSTEM 8．1LJGHT］NG UNJT Name

Specifications

Headlights

24V62／62W

Clearancelamps

24 V 12W

Tqrnsignals（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

ー169−

8．ELECTRIC SYSTEM

8．2 METERSAND SWITCHES 8．2．10PERATINGSTATUSMON］TORS（CLUSTER METER UNIT）

Theoperatingstatusmonitorsystemmonitorstheloader，soperatlngStatuSWiththesensorsand switchesinstalledontheloader，displaylngtheinformationontheclustermeterunitintheoperator compartmenttoinformtheoperatorofthecurrentoperatlngStatuSOftheloader・

TheoperatlngStatuSOftheloaderisdisplayedbyacombinationofmetersincludingthespeedometer， monitorlamps（Warninglamps），andindicationlamps・

q □ D＞

FM ：Fuelmeter

WTM：EnglneWatertemPeraturemeter

SM：Speedometer Ll−L13‥Monitorlamps

EHM：Enginehourmeter （Circuitdiagram）

Fig．8．1ClusterMeterUnit（1） −170−

8．ELECTRIC SYSTEM

CONN． No．

Connectedto

●CNl

15 Charge

口 Turnsignal（R）

2 Hibeam

CNl

Connectedto

CONN． No．

CNl

16 Glowplug

9 10 ＝ 12 13 14 15 16 17

3 Turnsignal（L）

17 Parkingbrake

4 Watertemp・SenSOr

18 Worklight

5 Engineoilpressure

19 Instrumentlamp

6 Power

20 Power

7萱N．C

21 （Emergencysteering）

8 Fuellevelsensor

●CN2

CN2

9

23 Higear

10

24 CNト3

四 N．C

25 OPT−1

12 N．C

26 Brakeoi11evel

13 Ground

●CN3

27 HourmeterGND CN3

28 Hourmeterpowersupply

14 CNト3

Fig．8．2 ClusterMeterUnit（2）

1．Meters Fuel level meter

EnglneWatertemP・meter

Meter

670C F】

E F

誓箭援】 Scale

団

Q農

Measurementpolnt 670C［1530F］〆 Standardresistance

49．8日

Sensorname

Application

Fuellevelsenderunit

Thermosenderunit

Fuel level

meter

Engine water

temp・meter

1020C［2160F］〆

E〆

F〆

16．8畠

80n

10n

Location

Specifications Floatposition

E

1／2

F

ResistanceE2

80

32

10

Insidefueltank

r托mp．0C［OF］ 50［122］ 80［176］ 120［248］ Upperfrontofenglne （atcoolingfanside） 32 10 Resistancef2 80 −171−

8．ELECTRIC SYSTEM

2．Monitorlamps（Warninglamps）

Theloaderisprovidedwiththreewarninglamps（Nos・1，2and7）andfourindicationlamps（Nos・3， 4，5，and6）．Nos．8and9areusedforoptionaldevices・ Whenthestarterswitchisturnedon，allmonitorlampsshouldcomeon・Ifanylampwon tcomeo

itissuspectedthatthebulbisblownout・ No．

Name

口 ▲

Engineoilpressure

2

3

LampcomesonwhenenglneOilpressureislowor theoilfilterisclogged． Batteryundercharged

Eヨ Batteryvoltage

Brake is applied

腔》 Brakeoilpressure

4 ㊨ 5

DescrlPtlOn

ノ鼻

6 ●令

Glowplug

Engine being preheated

worklight

Theworklightsareturnedon．

Higear

TheloaderisrunnlnginHigear

7 叫抄 Brakeoillevel

8 ㊨ 9

APS

Brakeoillevelislow．

Emergencysteer（0，tion） APS（option）

Name

Oil pressure switch

Application

Emergencysteerfunctionisused・ APSisused．

Specification Turnsonwhenoilpressureis

Engine oil PreSSure

Filterclogswitch

below29kPa（0．3kgf／cm2）［4．3psi］

Location

Left of engine

Turnsonwhenpressuredifferentialismore Nearoilfilteratleft thanO．3kPa（0．003kgf／cm2）［0．043psi］ OFF：0．64MPa（6．5kgf／cm2）［92psi］

Pressure switch （forparkingbrake）

Parkingbrake

Levelswitch

Brakeoillevel Turnsonwhenlevelislow．

ON：0．27MPa（2．8kgf／cm2）［40psi］ （Turnsonatatmosphericpressure・）

Ofenglne

Transmission disk brakearea Builtinbrakeoiltank

8，2．2 LIGHTINGSWITCHANDTURNS［GNALSWITCH Forthelightingswitchandturnslgnalswitch，referto＝Fig・2・11ShiftLever・ −172−

8．ELECTRIC SYSTEM

8．3 LOCAT［ON OF RELAYS

RELAY BOX

Rl：NEUTRALSTARTRELAY ∴＿＿＿ ＿＿＿＿＿＿＿

R2：ENGINESTOPMOTORRELAY

／／つ

R3：PARKINGBRAKERELAY（2） R4：PARKINGBRAKERELAY（1） R5：HEADLIGHT（Lo）RELAY

Viewlookin

R6：HORNRELAY

R7：F−N−RFRELAY R8：F−N−RRRELAY

﹇且﹇且

［吏］［亘］

R9：BACK−UPLAMPRELAY

RlO：F−N−RSOLENOIDGNDRELAY R11：HEADLIGHT（Hi）RELAY Wl：RIGHTWORKLIGHTRELAY W2：LEFTWORKLIGHTRELAY W3：ADDITIONALWORKLIGHT RELAY（OPTION） Note：Wl，W2andW3arenotavailable forAWspecifications・

Fig．8．3 RelayLocation −173−

8．ELECTRIC SYSTEM

8．4 ELECTRIC CIRCUIT DIAGRAM Note：Cordcolors：

Thecordsareclassifiedbycolor・ThefirstsymboIshowsthecablecolorandthe2ndthemarking color．

Wirediameter

Wirediametersareshowninthecircuitdiagram・Unlessotherwisespecified，thewirediamet O．85mm2［0．00132in．2］ Wire dia． Cord co10r

Use

⊥ T［s．。P．amP ／

0．5 L 0．5 BW

Fuel level meter

Charge

0．5 YL Watertemp・ 0．5 LG QOSsensor

1．25 RB GL GR RG

Worklight（rear） TurnL TurnR

Clearancelamp

ABeforetryingtoworkontheelectricsystem，makesuretodisconnecttheb

Whendisconnectingthebatteryconnectors，firstdisconnectthegroundside（・）termlnalbe

removingtheotherterminal．

Note：Theelectriccircuitdiagramisattachedattheendofthisbooklet・

−174一

No．SEW−619CE lssued： Jun．2001 Revised： Feb． 2003 Revised：JuJ．2004

丁伽。。。。。。A， ］NTERNAT10NALMARKETINGDIVIS10N：1・15−5，Nishi−Shjmbashi†Minato−ku，Tokyo

105・0003，Japan FAX：JAPAN＋81−3−35918152，3−35918153

Allrightsreserved

JB−0407010（OS）PrintedinJapan

OPTION

Ｓ３

Ｂ

OFF

0.5Y

Ｓｉｎｔ

Ｓ１

Ｓ２

Ｓ２

0.5BrG

Ａ／Ｃ

1 TAG

L WORK LIGHT RELAY

R WORK LIGHT RELAY

C

2GY 2B 0.5VG

2PG 2B 0.5PB

0.5R

2B 0.5OrW

0.5R 0.5R

SWITCH SIDE

OPTION

0.5B

0.5RB 1.25LW 1.25R

5 3 6 0.5B

SWITCH SIDE Hi

Me

B

R

HEATER (2SEATER CAB)

LB

Lo Hi

G

0.5GL 0.5W

AUX. BLOWER

ON(1)

2

B

RG

ON(2)

Hi

RG 0.5RL 0.5Or 0.5Y 0.5RB

HEATER BLOWER SW

AUX. BLOWER SW

ILLUMINATION ORK LIGHT (FRONT)

RW LB

Hi

L LR R

LY

LOCK (RADIO, TACHOGRAPH) ORK LIGHT (OPT)

HEATER BLOWER LY

Lo

WB

WB

OPT SPARE PWR. SUPP. (BATTERY, PRIMARY) SPARE PWR. SUPP.

STOP LAMP CHARGE WATER TEMP. GAUGE QOS2 SENSOR WORK LIGHT (REAR) TURN L TURN R CLEARANCE LIGHT

NC COM

BRAKE OIL

M

BrB 0.5OrG

45A

75A

2RW 2L 2B

A

3R 8W

0.5BrR 0.5Br

A

3A

40B M10

M10 +

(HARNESS WITH CAP) BR [AVX]

B

1.25B

40B

M10

GB

M10 +

QOS TIMER(4)←

M10

TURN SIGNAL (R) BRAKE LAMP CLEARANCE LAMP

B

M10

LB B

R

F

5R

LEFT SIDE WIPER

1.25L

2RL

HEATED GLASS(F)

2RW

5R

REAR FRAME

1.25R

1.25WR

BACK‑UP BUZZER

12W

LICENSE NUMBER PLATE

OPTION 1.25RB

NEUTRAL DAMP SOLENOID (21.7 )

BLACK

40B

F-N-R SOLENOID (20 for F and R)

2B 3B 3B 1.25B

R

R [AVX]

TRANSMISSION

TRANSMISSION

1.25W

2RB

B

W B

B

M10

2CAB FUSE BOX

B 3Y

LKO

CONTROL VALVE MAGNETIC DETENT

W [AVX] R [AVX]

BROWN

Y [AVX] B [AVX]

M WATER PROOF

OPTION

STA

GB

GLOW PLUG (QOS)

DIODE (3A)

L

ENGINE OIL FILTER CLOG SW

E

B ［ Br ［

R

FLOAT (FUEL LEVEL)

BATTERY→ BATTERY→

L

MONITO

1.25Y[AV 1.25Y[AV

M5x0.8 ←QOS TIMER

G ［AVX］ ］

WATER TEMP. SENDER

L

ENGINE

L

N STARTER RELAY→

［

QOS2 WATER TEMP. SENSOR

［AVX］ ］

M6x1 (HARNESS E

8W

3B

B

SELECTED BY ENGINE STOP MOTOR RELAY

BACK‑UP LAMP TURN SIGNAL (L)

F

SIDE WIPER R PWR. SUPP. SIDE WIPER L PWR. SUPP. HEAT RAYS GLASS PWR. SUPP. BEACON LIGHT, OPT PWR. SUPP.

1.25W 1.25L 1.25R 1.25Y

2CAB PWR. SUPP.

BRAKE LAMP

R

P2

ENGIN BRAKE OIL LEVEL SWITCH

A/C COMPRESSOR

12W

CLEARANCE LAMP

F

P1 A

GL LgR RG B

Br Y

1.25B [AVX]

］ ］

M10

→WATER TEMP. GAUGE

BP

1.25B [AVX]

1.25LY 1.25GY

Br[AVX]

M4

R [AVX]

RW B RY

GB

RG

M10

1.25GL [AV f]

1.25B

B W

R W

1.25Y

2W

RIGHT SIDE WIPER

1.25LB

W B

R

1.25BY BEACON LIGHT, OPT

1.25BR

ALTERNATOR B TERMINAL

←BATTERY BY LW

P. BRAKE RELEASE T/M ROTATION SOLENOID (30 ) SENSOR

P. BRAKE MONITOR SWITCH LB BY

Hi/Lo SOLENOID (30 )

LIFT KICKOUT

1.25LY

(GR)

A/C CONDENSER

BACK‑UP LAMP

GR LgR RG B

‑

BATTERY STD: 80D26R OPT: 95D31R

3Y

A/C COMPRESSOR

BrR BrL

L13‑3, LX70‑7 : 40B L16‑3, LX80‑7 : 60B

2PL

STARTER S TERMINAL R BACK‑UP LAMP GLOW RELAY GLOW RELAY BATTERY RELAY

GL GR RG

1.25RB

Y G L

R [AVX] Br [AVX] Y [AVX] W [AVX] G [AVX] L [AVX]

M8

AIR CONDITIONER (1S, ROPS CAB)

M

B lg

RG 1.25B

BATTERY RELAY B1

0.5GR

62/62

3B 8W

3R 8W

LB L BW

GB LB

HEAD LIGHT (L)

2L 2WB

1.25RB

R W

25W

PRESSURE SW

BrB

WORK LIGHT (REAR)

M10

12W

M

2R

CAB TIRE CABLE

CLEARANCE LIGHT TURN SIGNAL (L)

ER

AIR CONDITIONING SPEC. ONLY 75A

8W

DIODE (3A)

1.25BrW [AV f] 1.25B [AV f]

RG

Hi

H

1.25BrW [AV f] 1.25B [AV f]

(GB)

Me

BLOWER MOTOR

1.25GR [AV f]

1.25W 1.25B

Lo

1.25WG

3B 8W

LgR

FNR R

P.BRAKE OFF GND P. BRAKE MONITOR

0.5Lg

G

RY

OPTION

BUCKET POSITIONER

C

WINDOW WASHER MOTOR

(Install in open state (pressed))

RW

Low HORN

B

1.25LW

YW B

G

FUEL LEVEL GAUGE

[AVSS f] BKO/RTD

HORN

1.25BrW 2B 1.25LY

H/L SOLENOID GND H/L SOLENOID PWR. SUPP. T/M ROTATION SENSOR

1.25RY 1.25RG 1.25GL

E

DIODE (3A)

HORN

C B Lo

Hi

HEATER BLOWER

BRAKE LAMP LIMIT SW

1.25BrW 1.25B 1.25LY

HEAD LIGHT Hi HEAD LIGHT Lo CLEARANCE LIGHT HORN L

WASHER R

1.25RG [AV f]

HEATER (1S, ROPS CAB)

M

RG

SPARE PWR. SUPP. (CLEARANCE LIGHT)

SWITCH SIDE

LB LY BW WB LW

ONT WIPER (W)

1.25LB 1.25LY 1.25WG

2B B 2B

D

WASHER F

AR WIPER PWR. SUPP. AR WIPER (LW) AR WIPER (LR)

BRAKE OIL LEVEL

1.25RW 1.25RY RG GL

HEATER BLOWER SW

M10 OCK(RADIO)

3A

Hi

1.25LB 1.25B 1.25LW

OPTION

0.5Y 0.5WB

CN(A)

(GR)

M

0.5B 2B 2B

2B

M10

FRONT FRAME

Hi

0.5RL 0.5BG

BATTERY CHARGE ENGINE OIL PRESS

OPT

BLOWER MOTOR

4.6Ω

KEY SW BR→

GR TURN R GL TURN L REAR WORK LIGHT 1.25RB

0.5RW

Me

FOR APS (OPT)

0.5GW KEY SW C →

1.25LW

0.5BrW

3B

0.5B

1.25LB 1.25LY 1.25WG

0.5WB

RG 0.5B

0.5B

BLOWER RESISTOR 1.8Ω

MONITOR LIGHTING TURN

KEY SW C KEY SW BR KEY SW R2 HORN KEY SW ACC FRONT WORK LIGHT GLOW LAMP

M

Lo

HEAD LIGHT Lo HEAD LIGHT Hi

25W

2Or

1.25B 2Lg 2PG 2GY

2B

0.5B

0.5RL

1.25RG 1.25YR 0.5B

0.5B

0.5RL 2RG 1.25RG 1.25WY 1 2 4

3 6

BKO/RTD

TURN SIGNAL (R)

VENTILATION SELECTION SERVO MOTOR

TIMER SIDE

0.5LY

T/M Hi SPEEDOMETER SIGNAL FNR PWR. SUPP. HEAD LIGHT PWR. SUPP. KEY SW B TERMINAL HAZARD

0.5RG

CLEARANCE LIGHT

b Ｍa

0.5G 0.5Y

WORK LIGHT RELAY (OPT)

HEAD LIGHT Lo SIGNAL HEAD LIGHT Hi SIGNAL P.BRAKE HORN MONITOR PWR. SUPP.

12W

OUTLET SWITCHING SERVO MOTOR

from PRESS. SW

P.BRAKE MONITOR WORK LIGHT PWR. SUPP.

62/62

b Ｍa

OFF

←POWER SUPPLY

HEAD LIGHT (R)

THERMISTOR

0.5BrR 0.5OrB

2RG

OFF

GR

0.5B

Ｍ BLOWER RESISTER

0.5YG 0.5WL

Connect when the optional work light is used

2WS SWITCH

FNR R SIGNAL

2Or 0.5YB

0.5R 0.5R

A/M SERVO MO A/M SERVO MOTOR MO

IN/OUT SERVO MODE SERVO M MODE SERVO M

SPARE PWR. SUPP.

BLOWER MOTOR

0.5GR 0.5P 0.5WL 0.5LgY 0.5YW

OPT

1.25LW

0.5 0.5B 0.5B 0.5

0.5

A/M SERVO M

AIR MIX SERVO MOTO

1.25WG

P.

ROOM UNIT

2L BrB

W1

CONDENSER RELAY

0.5R

0.5WR 2RG 2Y

W2

COMPRESSOR RELAY (AR5)

W3

KEY SW C→ STARTER S TERMINAL ←

0.5P 0.5

0.5WB

0.5 0.5BY 0.5B 0.5B 0.5Lg

0.5 0.5 0.5 0.5 0.5 P.Br Sw→

P.BRAKE SOLENOID ←

P.Br Sw→ Sw→

0.5 0.5

0.5

1.25RB

BLOWER MAI A/M SERVO M

C

2YR BrB

NEUTRAL START RELAY

BLOWER Hi BLOWER Me(

1.25W 1.25L

HARNESS CONNECTOR

2W 2W 2W 2W 3R 2W

ENGINE STOP MOTOR RELAY

FNR Sol GND RELAY

0.5R

LW

YW LY

RB

GY LB 1.25B

CONNECTOR

THERMISTOR

0.5BR 0.5WB 0.5WB

rY

1.25WR GB 0.5Y 0.5BrW 0.5BrG 1.25R

P. BRAKE (1) RELAY

0.5LB

E

2

LB

GL

P. BRAKE (2) RELAY

1

2

10

HI Hi RELAY (AR4)

LY

YB YR

FN

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

LR L 1.25WY 1.25YG

5

RG

RB

HEAD LIGHT (Lo) RELAY

YB YR

0.5LG 0.5B 0.5YL

Y G

0.5WL 0.5LY

H/L to fr

P.Br RELAY(1),(2)

1.25B

KEY SW BR→

0.5BrB

1.25LY 1.25LY 1.25LY 1.25BrW

0.5B

1.25R

1.25RL

0.5B

0.5LY 0.5G 0.5GB

BATTERY RELAY←

0.5B

0.5BW 1.25WR

BrY 0.5RY RESET

1.25BW

1S, ROPS CAB WIPER

SW AS SW INT WASHER SW FRONT WIPER PWR. SUPP. FRONT WORK LIGHT (L) FRONT WORK LIGHT (R)

P. OFF

GL

M10

6

W

1.25B

OPTION

REAR WIPER (LR) FRONT WIPER (L) FRONT WIPER (W)

4

P.Br PWR. SUPP.

1.25YG

CLOCK (RADIO) RADIO REAR WIPER (L)

2

P. ON

WB WG

R

1

H HAZARD PWR. SUPP. TTURN PWR. SUPP.→

WORK LIGHT (OPT) (FRONT)

H

4

HORN SWITCH

0.5BrB

WORK LIGHT (OPT) 1.25R BEACON LIGHT FLASHING INTERVAL SWITCHING SIGNAL 1.25W BEACON LIGHT PWR. SUPP. 1.25YR

CARLING SWITCH VCH HOUSING

1.25R 0.5RL 0.5RB RG

B

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

ＧＮＤ

FLASHER

1 2

8W

QOS TIMER (ATTACHED TO ENGINE)

Y Y G G Y G

ＷＡＳＨＥＲ ＳＷ Ｗ

8W

SPARE PWR. SUPP.

CONNECT ONLY L16‑3, LX80‑7

6

0.5GL

GY

0.5BrG

ＳＷ ＩＮＴ

0.5GY

LB YB

２４Ｖ

0.5GY ←0.5GY

L

ACG L TERMINAL→

L

3W

L 19

GR

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

0.5RL 0.5RL 0.5RL

GW

RB

1.25LR 1.25LR 1.25RB

R

ＳＷ ＡＳ

3W

DIMMER H 20

5

FRONT WORK LIGHT RELAY←

WIPER MOTOR (FRONT)

3

1.25R 1.25RY

PARKING BRAKE SW

18

B

BR C B

ACC R2

RB

1.25LR 1.25RB

17

WIPER RELAY

Y L W

KEY

CANOPY

5

0.5Br

LIGHT

BRAKE

MON WORK T/M

GLOW

CHARG

(B) (L) (LW) (LR)

SPEED

G TURN Hi BE TURN

B

L

1

RELAY BOX

WIPER MOTOR (REAR)

LW LR

C

RELAY BOX

START

WB

B

0.5R

16

2Y 1.25R

RELAY SIDE

1.25LW

15

A/C CONTROL

A/C CONTROL WORK LIGHT (CAB) FLOOR CONDENSER FRONT WIPER RADIO REAR WIPER

14

M2 Me (2)

8W

13

0.5WR

BrY

C

WORK LIGHT

1.25LR

R2

GLOW

1.25LR

L

0.5WL 0.5L 1.25LY

BR ACC R1

OFF

0.5BrR

CONTROLLER→

0.5BW 0.5B

R

B

12

ON

B

0.5B 0.5B

0.5LG 0.5WL 0.5WL 0.5LW 0.5B N 5

→

0

B

T/M ROTATION SENSOR T/M ROTATION SENSOR APS SOL MODEL SELECT ACC PWR. SUPP. TACHO QSS SWITCH Hi/Lo SOL

3

←

L 9

B 0 0

8

11

CIGAR LIGHTER (MAX 3A)

1.25W

1.25YR

RW

FRONT /REAR

B

H/L SW Lo SIGNAL T/M Hi SPEEDOMETER

7

M1 Me (1) RELAY (AR2)

BLOWER MAIN RELAY (AR1)

3A

1.25LY

TURN SIGNAL

(21)

OFF

(28) (27)

RADIO RADIO (CLOCK)

BEACON LIGHT

BRAKE OIL PRESS.

1.25R

1.25B

WORK LIGHT SWITCH CANOPY

LO

BEACON LIGHT SW

T/M, H/L SOL

0.5L

COLUMN SWITCH ASS'Y

AIR CONDITIONER (1S, ROPS CAB)

LB

A/C PANEL

0.5WL

TRANSMISSION CONTROLLER

RW

L

G

WORK LIGHT (OPT) (CAB REAR)

LW

Ｓ１

1.25R

DIODE (3A)

R

A/C CONTROL PW PWR. SUPP.

6 HORN RELAY

GB

LR

LW RW LB

BACK‑U

L H

L LR

FNR R RELAY

ＯＦＦ ＯＮ Ｗ

1.25LW 1.25LW 1.25L

LR RW LW

11 AD LIGHT

9

8

FNR F RELAY

0.5LB

7

FRONT/REAR T/R REAR

LW

Ｂ

1.25WR

OPTION

L

REAR WIPER SWITCH

Ｗ CONNECTOR KIT

135 2

0.5B

FRONT /REAR

0.5Y

R

Ｈ

1.25YR 1.25LW 1.25YR

5 3

OFF

1.25B

SIDE CONSOLE (COMMON TO 1S AND 2S)

1

km/h

FUEL

QSS Sw

SWITCH SIDE

1.25LW

ROOM LIGHT

LIGHTING

FRONT

FRONT ONLY

1.25B

0.5B WB 0.5Y

1.25WY

FEEDER

COCKPIT

L R

2 6

7 3 8

WORK LIGHT SW CAB

FUSE BOX

OPT

L

RADIO (AM)

RELAY SIDE

L WB LY

MONITOR

ＮＯ

WORK LIGHT (OPT) (FRONT)

ANTENNA

E F

ALTERNATOR

STD:50A OPT:60A

R

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

ELECTRIC WIRING DIAGRAM FOR THE L13‑3 AND L16‑3

[Serial No. L13‑3: #05101‑, L16‑3: #02101‑]

TCJmc。。，。RAT10N