Upper Structure Does Not Swing - Komatsu PC200-8M0 Shop Manual

SEN06139-00
H-22 Upper structure does not swing
Failure (1) Upper structure swings neither to the right nor left
Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
Malfunction of swing holding
1
brake solenoid valve
Malfunction of swing control
2
valve (spool)
Malfunction of swing motor
3
(swing holding brake)
Probable
causes and cri-
teria
Improper adjustment or Mal-
4 function of swing motor
(safety valve)
5 Defective swing motor
6 Defective swing machinery
32
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
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.
Swing brake may malfunction. Check it.
a Be ready with engine stopped, then troubleshoot with engine
high idle.
If normal oil pressure is not obtained by adjustment, swing motor
safety valve may malfunction or may internal defect. Check it.
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Swing machinery may have internal defect. Check it.
* It may be checked by abnormal sound, abnormal heating,
metal chips in drain oil, etc.
Criteria and troubleshooting procedure
lever
Neutral
Left swing
Right swing
Swing lock Left work equipment
switch control lever
Swing to hydraulic
ON
Swing lock Left work equipment
switch control lever
Swing to hydraulic
ON
H-22 Upper structure does not swing
Output pressure of swing holding
brake
solenoid valve
0 MPa
2
{0 kg/cm }
Approx. 2.9 MPa
{Approx. 30 kg/cm
Swing relief pressure
28.9 to 32.9 MPa
relief
{295 to 335 kg/cm
Leakage from swing
motor
Below 10 l/min
relief
PC200, 200LC, 220, 220LC-8M0
2
}
2
}