Komatsu PC200-8M0 Shop Manual page 915

500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-23 Swing acceleration is poor or swing speed is low
Failure (2) Swing acceleration performance is poor or swing speed is slow in only one direction.
Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
Malfunction of swing PPC
1
valve
Malfunction of swing control
Probable
2
valve (spool)
causes and cri-
teria
Malfunction of swing control
3 valve (pressure compensa-
tion valve)
Malfunction of swing motor
4
(suction valve)
Malfunction of swing motor
5
(check valve)
PC200, 200LC, 220, 220LC-8M0
Cause
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Left work equipment control
Spool of swing control valve may malfunction. Check the spool.
Pressure compensation valve of swing control valve may malfunc-
tion. Check it.
Suction valve of swing motor may malfunction. Check the valve.
* This failure can be checked by interchaning right and left suc-
tion valves of swing motor and watching how condition
changes.
Check valve of swing motor may malfunction. Check the valve.
* This failure can be checked by interchaning right and left suc-
tion valves of swing motor and watching how condition
changes.
Criteria and troubleshooting procedure
lever
Neutral
Left swing
Right swing
SEN06139-00
PPC valve output pressure
0 MPa
2
{0 kg/cm }
2.84 to 3.43 MPa
2
{29 to 35 kg/cm }
40-500
35