Komatsu WB140-2N and WB150-2N Backhoe Loader Repair Service Manual

Table of Contents

Komatsu WB140-2N and WB150-2N Manual

Main sections and selected subjects identified in the source documentation:

• Manuals: Shop Manual
• 01 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01-1
• 10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD . . . . . . . . . . . . . . . . . . . . 10-1
• 20 TESTING, ADJUSTING AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-1
• 30 DISASSEMBLY AND ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-1
• 90 OTHER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90-1
• GENERAL
• STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
• TESTING, ADJUSTING AND TROUBLESHOOTING
• DISASSEMBLY AND ASSEMBLY
• FLOW VALVE TESTING
• Disconnect the hose a from the load sensing line. Install the tee b and reconnect the hose.
• Connect a pressure port and gauge E1 to the tee b.
• Connect a second gauge E1 to the rear control valve pressure port c.
• Start the engine and at low idle without any machine movement, check the pressure on both gauges.
• P pressure at control valve gauge: 30 3 kg/cm Normal pressure PLS: 6 2 kg/cm
• This value is due to the influence of the counter pressure present in the steering circuit.
• If any variations are found, they do not represent a problem provided that the difference of 21 1 kg/cm between the two readings is respected.
• If the difference between the readings is higher than 24 1 kg/cm, stop the engine and release the residual pressures.
• Thoroughly clean the valve d and reinstall it.
• Valve = 20 N.M
• If, after cleaning the valve d, the value still does not fall within the tolerance limits of 24 1 kg/cm, install a new valve.