Komatsu PC200-8M0 Shop Manual page 890

SEN06139-00
Defective adjustment or mal-
Probable
7
function of LS valve
causes and cri-
teria
8 Malfunction of servo piston
9 Defective piston pump
10
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-1 Speed or power of whole work equipment, swing, and travel is low
Cause
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Measured oil pres-
Pump discharge
PC valve output pres-
If normal oil pressure is not obtained by adjustment, the LS valve
may malfunction or have internal defect. Check LS valve.
Servo piston may malfunction. Check it.
Piston pump may have performance deterioration, malfunction or
internal defect.
Criteria and troubleshooting procedure
Operation of levers and oil pressure ratio
All levers in the neu-
sure
tral position
pressure Almost same pres-
sure
sure
PC200, 200LC, 220, 220LC-8M0
Run the track off
ground.
(lever at half stroke)
1
Approx. 0.6 (Approx.
3/5)