Hydraulic Drift Of Swing Is Large - Komatsu Galeo PC800-8 Shop Manual

40 Troubleshooting
H-28 Hydraulic drift of swing is large
Failure

• Hydraulic drift of swing is large

phenomenon
Relative
• Carry out all the troubleshooting in working mode P.
information
Possible causes
Malfunction of swing hold-
and standard 1
ing brake solenoid valve
value in normal
state
Malfunction of swing motor
2
(parking brake)
Failure
• Hydraulic drift of swing is large
phenomenon
Relative
information
Malfunction of swing
1
control valve (spool)
Malfunction of swing
2 control valve
Possible causes
(suction valve)
and standard
value in normal
Malfunction of swing motor
3
state
(safety valve)
Malfunction of swing motor
4
(suction valve)
Malfunction of swing motor
5
(check valve)
PC800, 850-8
Cause Standard value in normalcy and references for troubleshooting
aKeep the engine stopped for the preparations, and run it at high idle
during troubleshooting.
Left work equipment control lever
Neutral (After 5 seconds or more)
Operated to swing (in either direc-
The parking brake of the swing motor may malfunction. Check it directly.
Cause Standard value in normalcy and references for troubleshooting
The spool of the swing control valve may malfunction. Check it directly.
The suction valve of the swing control valve may malfunction. Check it
directly.
The safety valve of the swing motor may malfunction. Check it directly.
The suction valve of the swing motor may malfunction. Check it directly.
The check valve of the swing motor may malfunction. Check it directly.
(1) While the swing holding brake is applied.
Solenoid valve outlet pressure
tion)
(2) While the swing holding brake is released.
SEN00794-02
0 MPa {0 kg/cm 2 }
Min. 2.74 MPa
{Min. 28 kg/cm 2 }
39