Fine Control Performance Or Response Is Low - Komatsu PC200-8M0 Shop Manual

SEN06139-00
H-5 Fine control performance or response is low
q
Failure

Fine control performance or response is low.

Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
1 Malfunction of LS-EPC valve
2 Clogging of LS circuit orifice
Probable
causes and cri-
teria
Defective adjustment or mal-
3
function of LS valve
4 Malfunction of servo piston
14
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
Cause
a Be ready with engine stopped, then troubleshoot with engine at
full speed.
Travel speed
Orifice of LS circuit (pump – piping – control valve) may be
clogged. Check it.
a Be ready with engine stopped, then troubleshoot with engine at
full speed.
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.
H-5 Fine control performance or response is low
Criteria and troubleshooting procedure
Travel lever
Lo Neutral
Hi Operation
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
LS-EPC valve
output pressure
Approx. 2.9 MPa
2
{Approx. 30 kg/cm }
0 MPa
2
{0 kg/cm }
Run the track off
ground.
(lever at half stroke)
1
Approx. 0.6 (Approx.
3/5)