Komatsu PC200-8M0, Shop Manual, Page: 892 / 1254

500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-3 Work equipment, swing, and travel systems do not work
40-500
12
PC200, 200LC, 220, 220LC-8M0
SEN06139-00
H-3 Work equipment, swing, and travel systems do not work
Failure
q
All work equipment, swing, and travel do not work
Related infor-
mation
q
Perform all troubleshooting with working mode in power mode (P).
Probable
causes and cri-
teria
Cause Criteria and troubleshooting procedure
1
Malfunction of PPC lock
solenoid valve
a
Be ready with engine stopped, then troubleshoot with engine
high idle.
Lock lever
PPC lock solenoid valve
output pressure
LOCK
0 MPa
{0 kg/cm
2
}
FREE
Approx. 2.9 MPa
{Approx. 30 kg/cm
2
}
2
Malfunction of self-pressure
reducing valve
a
Be ready with engine stopped, then troubleshoot with engine
high idle.
Control lever Control circuit source pressure
All levers in the neutral position
2.84 to 3.43 MPa
{29 to 35 kg/cm
2
}
3 Defective piston pump
Piston pump may malfunction or have internal defect. Check it by
following method.
1) Remove pump discharge pressure pickup plugs (F and R).
2) Crank engine at flywheel (manually).
3) If the oil flows out of the pump discharge pressure pickup ports,
it is normal.
4 Defective damper
Pump shaft may not revolve because of internal defect of damper.
Check damper.