Hydraulic Drift Of Swing Is Large - Komatsu PC200-8M0 Shop Manual

500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-27 Hydraulic drift of swing is large
H-27 Hydraulic drift of swing is large
Failure (1) Swing drift on a slope is large (when swing holding brake is being applied)
q
When swing lock switch is turned to ON position or when swing brake cancel switch is set to normal
Related infor- position, swing holding brake is applied and swinging motion of upper structure is stopped with disc
mation brake.
q
Perform all troubleshooting with working mode in power mode (P).
Probable
Malfunction of swing holding
1
causes and cri-
brake solenoid valve
teria
Malfunction of swing motor
2
(swing holding brake)
Failure (2) Swing drift on a slope is large (when swing brake is being released).
q
When swing holding brake release switch is in release position, swing holding brake is released
Related infor-
andupper structure is secured by only hydraulic pressure.
mation
q
Perform all troubleshooting with working mode in power mode (P).
Malfunction or defective seal
1
of swing control valve (spool)
Defective seal of swing con-
2 trol valve (pressure compen-
sation valve)
Probable
Defective seal of swing
3
causes and cri-
motor (safety valve)
teria
Defective seal of swing
4
motor (suction valve)
Defective sealing of swing
5
motor (check valve)
Defective seaing for swing
6
motor (shockless valve)
PC200, 200LC, 220, 220LC-8M0
Cause
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Left work equipment control
Swing brake may malfunction. Check it.
Cause
Swingcontrolvalve spool may have malfunction or defective seal.
Check it.
Sealofpressure compensation valve of swing control valve may be
defective. Check it.
Sealing for safety valve of swing motor may be defective .Check
the valve.
Sealing of the suction valve of the swing motor may be defective.
Check it.
Sealing for check valve of swing motor may be defective . Check it.
Sealing for shockless valve of swing motor may be defective.
Check it.
Criteria and troubleshooting procedure
Output pressure of swing holding
lever
Neutral
Left swing
Right swing
Criteria and troubleshooting procedure
SEN06139-00
brake
solenoid valve
0 MPa
2
{0 kg/cm }
Approx. 2.9 MPa
2
{Approx. 30 kg/cm }
39
40-500