Hitachi Ex8 2b Excavator Service Repair Manual

Technical Manual EX8-2B

SECTION 1

GENERAL ; CONTENTS; ; Group 1 Specification Specifications ............................................T1-1-1 Working Ranges and Machine Dimensions for Transportation ..................T1-1-2 Engine Specification ..................................T1-1-3

Group 2 Component Layout Main Component ......................................T1-2-1 Electrical System......................................T1-2-2 Monitor Panel ...........................................T1-2-3

522T-1-1

(Blank)

522T-1-2

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GENERAL / Specifications SPECIFICATIONS

Item

Unit

Front Attachment Bucket Capacity (Heaped) Machine Weight Base Machine Dry Weight Engine A: Upperstructure Width B: Overall Transportation Height C: Rear End Swing Radius D: Minimum Ground Clearance E: Counterweight Clearance F: Engine Cover Height G: Undercarriage Length

ҥ 3 m kg (lb) kg (lb) − mm (ft in) mm (ft in) mm (ft in) mm (ft in) mm (ft in) mm (ft in) mm (ft in)

H: Undercarriage Width

mm (ft in)

I: Sprocket Center to Idler Center J: Track Shoe Width Ground Pressure Swing Speed Travel Speed Gradeability

mm (ft in) mm (ft in) kPa (kgf/cm2, psi) -1 min (rpm) km/h (mph) % (deg.)

Fixed Undercarriage Undercarriage Width ExWidth Type tension/Retraction Type Standard Canopy Standard Canopy Boom swing type 0.022 PCSA heaped (0.020 CECE heaped) 740 (1630) 770 (1700) 780 (1720) 810 (1790) 570 (1260) 600 (1320) 610 (1340) 640 (1410) -1 KUBOTA Z482-B 6.4 kW/2450min (8.7 PS/2450 rpm) 720 (2’ 4”) 720 (2’ 4”) 1350 (4’ 5”) 2040 (6’ 8”) 1335 (4’ 6”) 2045 (6’ 9”) 820 (2’ 8”) 820 (2’ 8”) 165 (0’ 6”) 130 (0’ 5”) 385 (1’ 3”) 390 (1’ 3”) 965 (3’ 2”) 970 (3’ 2”) 1225 (4’ 0”) 1225 (4’ 0”) 720 / 900 (2’4” / 2’11”) 810 (2’ 8”) (Retraction/Extension) 900 (2’ 11”) 900 (2’ 11”) 180 (0’ 7”) 180 (0’ 7”) 19.6 20.6 20.6 21.6 (0.20, 2.8) (0.21, 3.0) (0.21, 3.0) (0.22, 3.1) 9.2 (9.2) 2.0 (1.2) 58 (30)

M522-11-002

T1-1-1

GENERAL / Specifications WORKING RANG ] MACHINE DIMENSION FOR TRANSPORTATION

L (Left) R (Right)

K (Left) K (Right) M522-11-003

Category Item A: B: C: D: E:

Maximum Digging Reach Maximum Digging Depth Maximum Cutting Height Maximum Dumping Height Overall Transport Height

mm (ft in) mm (ft in) mm (ft in) mm (ft in) mm (ft in)

F: Overall Transport Length G: Minimum Swing Radius H: Minimum Swing Radius with Maximum Boom-Swing Angle I: Blade Bottom Highest Position J: Blade Bottom Lowest Position K: Maximum Boom Swing Angle L: Offset Distance

mm (ft in) mm (ft in) mm (ft in) mm (ft in) mm (ft in) Deg. mm (ft in)

M522-11-001

0.70 m Arm Fixed Undercarriage Undercarriage Width ExWidth Type tension/Retraction Type 2800 (9’ 2”) 2800 (9’ 2”) 1525 (5’ 0”) 1520 (4’ 11”) 2800 (9’ 2”) 2805 (9’ 2”) 2035 (6’ 8”) 2040 (6’ 8”) 1350 (4’ 5”) / 1355 (4’ 5”) / Canopy: 2040 (6’ 8”) Canopy: 2045 (6’ 8”) 2745 (9’ 0”) 2745 (9’ 0”) 1025 (3’ 4”) 1025 (3’ 4”) 775 (2’ 6”) 775 (2’ 6”) 155 (0’ 6”) 170 (0’ 6”) Left 90 Right 50 Left 300 Right 390 (0’ 11”) (1’ 3”)

T1-1-2

155 (0’ 6”) 170 (0’ 6”) Left 90 Right 50 Left 300 Right 390 (0’ 11”) (1’ 3”)

GENERAL / Specifications ENGINE SPECIFICATION Item Engine Manufacturer Model Type Cyl. Number-Bore×stroke Piston displacement Rated horsepower Compression ratio Dry weight Firing order Rotation direction Length×Width×Height Starting system Manufacturer Motor Voltage⋅Output Alternator Manufacturer Type Voltage Output Fuel system Type Governor Performance Lubrication Oil Consumption Fuel Consumption Rate (NET) Injection Timing Maximum Output Torgue Injection Pressure Compression Pressure Valve Clearance Idle Speed

KUBOTA Z482-B Diesel 4 cycle, vertical, water cooled, swirl chamber type 2-67 mm (2.6 in) × 68 mm (2.7 in) 3 0.479 L (29.2 in ) -1 6.4 kW/2450 min (8.7 PS/2450 rpm) 23 69 kg (152 Ib) 1-2 Clockwise (viewed from fan side) 356 mm (1 ft 2 in)×385 mm (1 ft 3 in)× 492 mm (1 ft 7 in) MITSUBISHI DC series reduction type 12 V ⋅ 0.8 kW KOKUSAN AC type 12 V ⋅ 12.5 A Bosch MD type Centrifugal ball, mechanical type 9 mL/hr or less 285 g/kW⋅hr or less 210 g/PS⋅hr or less 17° before top dead center 26 N⋅m (2.66 kgf⋅m) or more/ -1 1400 to 1600 min 2 11.8 MPa (120 kgf/cm ) 2 3.4 MPa (35 kgf/cm ) or more 0.145 mm (0.006 in) to 0.185 mm (0.007 in) +50 -1 Fast: 2650 0 min -1 Slow: 1150±50 min

T1-1-3

GENERAL / Specifications (Blank)

T1-1-4

GENERAL / Component Layout MAIN COMPONENTS

2 3

4

1

5 6

7 8

9

13 12 11

T522-01-02-001

10

1234-

Bucket Cylinder Arm Cylinder Boom Cylinder Control Valve

5 - Boom-Swing Cylinder 6 - Swing Device 7 - Pump Device

8 - Hydraulic Oil Tank 9 - Radiator 10 - Travel Device

T1-2-1

11 - Fuel Tank 12 - Center Joint 13 - Blade Cylinder

GENERAL / Component Layout ELECTRICAL SYSTEM 1 2 3

4

5 6 7

8

9 10 11

17 18

16 15 14

13 12

19

20 T522-01-02-002

21

1234-

Work Light Horn Overheat Indicator Engine Oil Pressure Indicator 5 - Key Switch 6 - Alternator Indicator

78910 -

Hour Meter Fuse Box Fusible Link Engine Stop Solenoid

11 - Battery

12 13 14 15 -

Fuel Pump Horn Relay Timer Solenoid Starter Relay 2 (Hour Meter) 16 - Starter Relay 1 (Starter)

T1-2-2

17 18 19 20 -

Regulator Thermo Switch Alternator Engine Oil Pressure Switch

21 - Starter

GENERAL / Component Layout MONITOR PANEL

1

2

3

4

M522-01-008

1 - Overheat Indicator

2 - Hour Meter

3 - Engine Oil Pressure Indicator

T1-2-3

4 - Alternator Indicator

GENERAL / Component Layout (Blank)

T1-2-4

SECTION 2

SYSTEM ; CONTENTS; ; Group 1 Hydraulic System Hydraulic System.......................................T2-1-1

522T-2-1

(Blank)

522T-2-2

SYSTEM / Hydraulic System HYDRAULIC SYSTEM Return oil from the cylinders and motors flows back to the hydraulic oil tank via the control valve.

The main pumps draw hydraulic oil from the hydraulic oil tank and discharge pressure oil to the control valve.

Changing flow direction and flow rate, pressure oil from the control vale flows to and actuates motors and cylinders, respectively.

Arm Cylinder

Boom Cylinder

Bucket Cylinder

Pressure Oil Output Port

Control Valve

9

8

7

6

5

4

3

2

Boom Swing Cylinder

1

1- Travel (Right) 2- Boom 3- Bucket Swing Motor

4- Swing 5- Aux.

Center Joint

6- Blade 7- Travel

Main Pump 2

8- Arm 9- Swing

Main Pump 1 Filter Hydraulic Oil Tank

Engine

Radiator

Center Joint

Main Circuit Suction Circuit Delivery Circuit

Travel Motor

Blade Cylinder

Return Circuit Drain Circuit

Travel Motor

Travel (Left)

Travel (Right) T522-02-01-001

T2-1-1

SYSTEM / Hydraulic System (Blank)

T2-1-2

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