Time Lag Of Work Equipment Is Large - Komatsu PC200-8M0 Shop Manual

500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-11 Time lag of work equipment is large
H-11 Time lag of work equipment is large
q
Failure Time lag of work equipment operation is large
Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
1 Malfunction of LS-EPC valve
Probable
Malfunction of control valve
causes and cri-
2 (regeneration valve) [Boom
teria
and arm only]
Malfunction of control valve
3
(safety-suction valve)
Malfunction of control valve
4 (pressure compensation
valve)
PC200, 200LC, 220, 220LC-8M0
Cause
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Travel speed
Regeneration valve of control valve may malfunction. Check it.
Safety-suction valve of control valve may malfunction. Check it.
* Judgment can be made by checking a change of phenomenon
after exchanging safety-suction valves of control valves with
those on a normal control valve.
(Set pressure of safety-suction valve for boom head circuit is
different, however.)
Pressure compensation valve of control valve may malfunction.
Check it.
Criteria and troubleshooting procedure
Travel lever
Lo Neutral
Hi Operation
SEN06139-00
LS-EPC valve
output pressure
Approx. 2.9 MPa
2
{Approx. 30 kg/cm }
0 MPa
2
{0 kg/cm }
21
40-500