Komatsu WB142-5 Backhoe Loader Service Manual

Table of Contents

• General
• Structure Function and Maintenance
• Standard Value
• Resting and Adjusting
• Troubleshooting
• Disassembly

GENERAL
This section lists the general machine dimensions, performance specifications, component weights, and fuel, coolant and lubricant specification charts.

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
This section explains the structure and function of each component. It serves not only to give an understanding of the structure, but also serves as reference material for troubleshooting.

TESTING, ADJUSTING AND TROUBLESHOOTING
This section explains checks to be made before and after performing repairs, as well as adjustments to be made at completion of the checks and repairs. Troubleshooting charts correlating Problems to Causes are also mention in this section.

DISASSEMBLY AND ASSEMBLY KOMATSU LOADER WB142-5

This section explains the order to be followed when removing, installing, disassembling or assembling each component, as well as precautions to be taken for these operations.

When removing covers which are under internal pressure or under pressure from a spring, always leave two bolts in position on opposite sides. Slowly release the pressure, then slowly loosen the bolts to remove.

When removing covers which are under internal pressure or under pressure from a spring, always leave two bolts in position on opposite sides. Slowly release the pressure, then slowly loosen the bolts to remove.

BACKHOE CONTROL VALVE KOMATSU LOADER WB142-5

REMOVAL

• Center the backhoe and leave the backhoe plate unlocked.
• Lower the outriggers to the ground, curl the bucket and allow it to rest on the ground on its back.
• Apply the parking brakes, stop the engine and remove the starting key.
• Release all residual pressure by operating the hydraulic controls (including any optional device pedals) several times in all directions.

1. Remove screws and remove control pedal for hammer (if equipped).
2. Remove metal floor cover (7) closing off the floor.
3. Disconnect all hoses and hydraulic lines.
• Ensure that all hoses are marked. Disconnect the hoses from the control valve starting from upper hoses (8).
• Plug all pipes and hoses immediately to prevent contamination.
4. Disconnect connector (10) from solenoid valve (9).
5. Disconnect links (12) from control valve (11).