H-3 Any Of Work Equipment, Swing And Travel Does Not Work - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting of hydraulic and mechanical system (H-
mode)

H-3 Any of work equipment, swing and travel does not work

A)
Any of work equipment, swing and travel does not work.
Failure
Related
Perform all troubleshooting with working mode set in power (P) mode.
information
No. Cause
Malfunction of work
1 equipment lock
solenoid valve
Malfunction of self-
2
pressure reducing valve
Defective piston pump
3
Defective damper
4
40-468
Procedure, measuring location, criteria, and remarks
a Be ready with engine stopped, then perform troubleshooting with engine at
high idle.
Solenoid output
pressure
a Be ready with engine stopped, then perform troubleshooting with engine at
high idle.
Control circuit
source pressure
a Since relief valve of self-pressure reducing valve is not adjustable, replace
self-pressure reducing valve assembly if normal pressure is not obtained.
Piston pump may malfunction or has internal defect. Check it by following
method.
Crank the engine with main oil pressure pickup port plug removed. o If
any oil flows out, piston pump is normal.
Pump shaft may not rotate due to some internal defect of damper.
When locked
When torque converter lockup
clutch is disengaged
All control levers in NEUTRAL
(PC88MR-FT5-400-A-Z1-
0 MPa
{0 kg/cm 2 }
3.14 ± 0.5 MPa
{32 ± 5 kg/cm 2 }
3.2 ± 0.5 MPa
{33 ± 5 kg/cm 2 }
PC88MR-10