Komatsu PC88MR-10 Shop Manual page 950

40 Troubleshooting
Troubleshooting of hydraulic and mechanical system (H-
mode)
Failure mode
One of tracks does not run
Machine does not swing
Swing acceleration or swing speed is low
Upper structure overruns excessively when it
stops swinging
Shock is large when upper structure stops swinging
Large unusual noise is heard when upper structure stops swinging
Swing drift on a slope is large
Oil flow in attachment circuit cannot be controlled
40-462
Component causing failure
Upper structure does not
swing to the right or left
Upper structure swing only
q
to the right or left
In both directions (right and
left)
In only one direction
q
(Both right and left)
(Either right or left)
q
q
When parking brake works
When parking brake is OFF
Solenoid valve
q
q
q
q q
q q
Swing motor
H-24
H-25
q q q
q q q H-26
q q q H-27
H-28
q q q q
q q H-29
q q q q H-30
q q H-31
q q H-32
H-33
q q q q H-34
H-35
PC88MR-10