Upper Structure Overruns Excessively When It Stops Swinging (Both Right And Left) - Komatsu PC88MR-10 Shop Manual

H-29 Upper structure overruns excessively when it stops swinging (both
right and left)
(PC88MR-L47-400-A-Z0-A)

Upper structure overruns excessively when it stops swinging (both right and left).

Failure
Perform all troubleshooting with working mode set in power (P) mode.
Related
Pump pressure can be checked with monitoring function. (monitoring code: 01100)
information
No. Cause
Defective swing motor
1
(safety valve)
Defective swing motor
2
PC88MR-10
Troubleshooting of hydraulic and mechanical system (H-
Procedure, measuring location, criteria, and remarks
a Be ready with engine stopped, then perform troubleshooting with engine at
high idle.
After troubleshooting, restore the machine to its original state.
Remove swing
Swing relief
parking brake
pressure
solenoid valve
If normal pressure is not obtained after adjustment, sealing of safety valve
may be defective.
a Be ready with engine stopped, then perform troubleshooting with engine at
high idle.
After troubleshooting, restore the machine to its original state.
Remove swing
Leakage from swing parking brake
motor solenoid valve
Swing hydraulic
relief
connector.
Swing hydraulic
relief
connector.
40 Troubleshooting
mode)
20.5 ± 1.5 MPa
{210 ± 15 kg/cm 2 }
Max. 7 l/min
40-507