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bobcat 642b skid steer loader service repair manual steering schematic pdf

This bobcat 642b skid steer loader shop repair manual is for the Bobcat loader mechanic. It provides necessary servicing and adjustment procedures for the Bobcat loader and its component parts and systems. Refer to the Operation & Maintenance Manual for operating instructions, starting procedure, daily checks, etc.

BOBCAT LOADER IDENTIFICATION

SEAT BAR,GRABHANDLESSTEERINGLEVERS,SEAT BELT,TILT CYLINDER,BUCKET,OPERATOR SEAT,AUXILIARY COUPLERS,SAFETY TREAD,BUCKET STEPS

SEAT BAR,GRABHANDLESSTEERINGLEVERS,SEAT BELT,TILT CYLINDER,BUCKET,OPERATOR SEAT,AUXILIARY COUPLERS,SAFETY TREAD,BUCKET STEPS

SEAT BAR,UPRIGHT,REAR GRILL,REAR DOOR,OPERATOR CAB (ROPS & FOPS),LIFT ARM,LIFT CYLINDER,TIRES

SEAT BAR,UPRIGHT,REAR GRILL,REAR DOOR,OPERATOR CAB (ROPS & FOPS),LIFT ARM,LIFT CYLINDER,TIRES

repair-guidebook

The content of the manual include:

chapter 1.HYDRAULIC CONTROL PEDALS

  • Adjustment 2 – 21
  • Removal and Installation 2 – 21

HYDRAULIC CONTROL VALVE

  • Adjusting the Main Relief Valve 2 – 9
  • Checking the Main Relief Valve with Auxiliary Couplers (Opt) 2 – 7
  • Checking the Main Relief Valve without Auxiliaries 2 – 8
  • Main Relief Removal and Installation 2 – 9
  • Removal and Installation 2 – 10

HYDRAULIC FLUID FILTER HOUSING

  • Removal and Installation 2 – 18
  • Sender Switch 2 – 19

HYDRAULIC FLUID RESERVOIR

  • Removal and Installation 2 – 20

HYDRAULIC PUMP

  • Checking the Output of the Hydraulic Pump 2 – 12
  • Removal and Installation 2 – 13

HYDRAULIC SYSTEM INFORMATION

  • Flare Connections 2 – 2
  • Straight Thread O–ring Fittings 2 – 2
  • Tubelines and Hoses 2 – 2

LIFT CYLINDER

  • Checking the Lift Cylinder(s) 2 – 3
  • Removal and Installation 2 – 3

PEDAL LOCK LINKAGE

  • Adjustment 2 – 22

PORT BLOCK

  • Case Drain Relief Valve 2 – 17
  • Cold Weather By–Pass Valve 2 – 16
  • Removal and Installation 2 – 15

TILT CYLINDER

  • Checking the Tilt Cylinder 2 – 5
  • Removal and Installation 2 – 5

TROUBLESHOOTING

  • Chart 2 – 1
hydraulic/hydrostatic flow chart for models 642b,643(with 3-spool meiroe control valve) chart # 6722238 (printed august 1992)

hydraulic/hydrostatic flow chart for models 642b,643(with 3-spool meiroe control valve) chart # 6722238 (printed august 1992)

chapter 2.HYDROSTATIC SYSTEM

FRONT PANEL

  • Removal And Installation 3–3

HYDROSTATIC MOTOR

  • Removal And Installation 3–10

HYDROSTATIC PUMP

  • Charge Pressure Relief Valve 3–12
  • Checking Charge Pressure 3–12
  • Checking High Pressure Relief Valves 3–13
  • High Pressure Hose Routing 3–16
  • Hydrostatic Pump Rear Mount 3–16
  • Removal And Installation 3–14
  • Tow Valves 3–16

HYDROSTATIC SYSTEM INFORMATION

  • High Pressure Relief/Replenishing Valve Function 3–2

STEERING LEVERS

  • Removal And Installation 3–5
  • Repairing The Steering Lever 3–6

STEERING LINKAGE

  • Removal And Installation 3–8
  • Repairing The Pintle Lever 3–9
  • Steering Linkage Adjustment 3–7

TROUBLESHOOTING

  • Chart 3–1

TROUBLESHOOTING

The serial number that

1. The hydrostatic system has a fluid leak.
2. The steering linkage needs adjustment.
3. The high pressure replenishing valve(s) are damaged.
4. the shuttle valve in the hydrostatic motor is not working correctly.
5. The valve plate seals in the hydrostatic motor are damaged.
6. The hydrostatic pumps have damage.
7. The final drive chain is broken.
8. The hydrostatic motor has damage.
9. the tires do not have the correct tire pressure.
10. The tires are not the same size.
11. The hydraulic fluid is not at the correct level.
12. The oil cooler has a restriction.
13. The temperature sending switch is not operating correctly.
14. The control valve is not operating correctly.
15. The loader is not being operated at the correct RPM.
16. The sender is defective.
17. Pump is defective or worn hydrostatics.
18. Hydraulic filter is plugged.

PROBLEM 1:No drive on one side, in one direction.

CAUSE 1:1, 2, 3, 4, 5

PROBLEM 2:No drive on one side in both directions.

CAUSE 2:2, 3, 5, 6, 7, 8

PROBLEM 3:The loader does not move in a straight line.

CAUSE 3:2, 3, 4, 6, 8, 9, 10

PROBLEM 4:The hydrostatic system is overheating.

CAUSE 4:4, 11, 12, 13, 14, 15

PROBLEM 3:The hydrostatic system is overheating.

CAUSE 4:4, 11, 12, 13, 14, 15

PROBLEM 5:The warning light comes ON (Low charge pressure).

CAUSE 5:11, 15, 16, 17, 18

chapter 3 DRIVE SYSTEM

AXLES, SEALS AND BEARINGS

  • Installation 4 – 5
  • Removal 4 – 4

CHAINCASE FLUID
Replacing the Chaincase Fluid 4 – 9
FINAL DRIVE CHAIN

  • Installation 4 – 8
  • Removal 4 – 8

PARKING BRAKE

  • Adjustment 4 – 1
  • Block and Pucks 4 – 2
  • Removal and Installation 4 – 1

chapter 4 MAIN FRAME

BOB–TACH FRAME (40 Series)

  • Disassembly and Assembly 5–11
  • Removal and Installation 5–9
  • Tilt Cylinder Rod End Seal 5–10

BOB–TACH FRAME (50 Series)

  • Removal and Installation 5–13
  • Bob–Tach Lever and Wedge 5–16

FUEL TANK

  • Removal and Installation 5–13

LIFT ARMS

  • Removal and Installation 5–7

OPERATOR CAB

  • Removal and Installation 5–1

OPERATOR CAB GAS CYLINDER

  • Removal and Installation 5–4

REAR DOOR

  • Door Latch Adjustment 5–5
  • Removal and Installation 5–6

chapter 5 ELECTRICAL SYSTEM

ALTERNATOR

  • Checking Alternator Output 6 – 3
  • Checking Alternator Regulator 6 – 3
  • Disassembly and Assembly 6 – 5
  • Removal and Installation 6 – 4

BATTERY

  • Checking the Battery 6 – 2
  • Removal and Installation 6 – 2

ELECTRICAL SYSTEM INFORMATION

  • Description 6 – 1

STARTER

  • Checking the Starter 6 – 8
  • Disassembly and Assembly 6 – 9
  • Removal and Installation 6 – 8
  • Replacing the Brushes 6–10

TROUBLESHOOTING

  • Chart 6 – 1

chapter 6 ENGINE SERVICE

  • ANTI–DIESEL SYSTEM
  • Removal and Installation
  • CAMSHAFT
  • CARBURETOR
  • CRANKSHAFT AND MAIN BEARINGS
  • CYLINDER LINERS
  • DISTRIBUTOR
  • ENGINE
  • ENGINE COMPRESSION
  • ENGINE FLYWHEEL & U–JOINT
  • ENGINE MUFFLER
  • FRONT CASE AND OIL PAN
  • FRONT CASE SEAL
  • FUEL PUMP
  • GOVERNOR
  • OIL COOLER AND BLOWER HOUSING
  • OIL PUMP
  • PISTON AND CONNECTING ROD
  • PISTON PIN
  • RADIATOR
  • REAR GRILL
  • ROCKER ARMS
  • THERMOSTAT
  • TIMING BELT
  • TROUBLESHOOTING
  • VALVES
  • VALVE CLEARANCE
  • WATER PUMP

chapter 7 SPECIFICATIONS

Complete download comes in PDF format which can work under all PC based Windows operating system and Mac also. It saves to your hard-drive and can be burned to CD-ROM. All pages are printable. No need to pay for shipping and wait for the overpriced paper textbook or CD-ROM to arrive via snail mail.

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