Swing Acceleration Is Poor Or Swing Speed Is Low - Komatsu PC200-8M0 Shop Manual

SEN06139-00
H-23 Swing acceleration is poor or swing speed is low
Failure (1) Swing acceleration performance is poor or swing speed is slow in both right and left directions.
Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
Malfunction of swing control
1
valve (spool)
Malfunction of all control
2
valves (LS shuttle valves)
Malfunction of swing motor
3
(swing holding brake)
Improper adjustment or Mal-
Probable
4 function of swing motor
causes and cri-
(safety valve)
teria
5 Defective swing motor
6 Defective swing machinery
34
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
Cause
Spool of swing control valve may malfunction. Check the spool.
LS shuttle valves of all control valves may malfunction. Check
them.
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 check by abnormal sound, abnormal heating, metal
chips in drain oil, etc.
H-23 Swing acceleration is poor or swing speed is low
Criteria and troubleshooting procedure
Swing lock Left work equipment
switch control lever
Swing to hydraulic
ON
Swing lock Left work equipment
switch control lever
Swing to hydraulic
ON
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
}