Swing Speed Or Acceleration Is Low During Compound Operation Of Swing And - Komatsu Galeo PC800-8 Shop Manual

40 Troubleshooting
• Swing speed or acceleration is low during
Failure
compound operation of swing and work
phenomenon
equipment
• Before carry out the following troubleshooting, check that the swing speed is normal when the swing
Relative priority switch is turned OFF.
information • When carrying out the following troubleshooting, set the working mode in the P-mode and turn the
swing lock switch OFF.
Malfunction of swing
1
priority solenoid valve
Possible causes
and standard
value in normal
state
Malfunction of swing
2
priority selector valve
Malfunction of swing
3 control valve
(throttle 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.
Swing priority switch and
right work equipment control lever
Swing priority switch OFF +
Boom RAISE operation
Swing priority switch ON +
Boom RAISE operation
aKeep the engine stopped for the preparations, and run it at high idle
during troubleshooting.
Right work equipment control lever
Boom RAISE stroke end
The throttle valve of the swing control valve may malfunction. Check it
directly.
(2) The swing speed or acceleration is low during com-
pound operation of swing and work equipment with
the swing priority mode ON.
Solenoid valve outlet pressure
Swing priority selector valve
Neutral
SEN00794-02
Min. 2.35 MPa
{Min. 24 kg/cm 2 }
0 Pa {0 kg/cm }
2
outlet pressure (Port A1)
0 Pa {0 kg/cm 2 }
0 Pa {0 kg/cm 2 }
35