Kubota KX080-4 Workshop Manual page 328

KX080-4, WSM
Swivel drifts
• Identify whether the fault is in the main system or the pilot system.
No. Cause
Slow return valve faulty
1
Anti-void valve faulty
2
Timer valve sticking or damaged
3
Pilot valve spool damaged
4
Swivel relief valve faulty
5
Anticaviation valve faulty
6
Swivel motor faulty
7
Main spool inside control valve
sticking or damaged
8
[5] TROUBLESHOOTING MULTIPLE OPERATIONS
Front fails to operate during multiple operations or while traveling
No. Cause
• Communication valve sub-spool
sticking
1
• Communication valve main spool
sticking
Remedy
Clean or replace the slow return valve
Clean or replace the anti-void valve
Clean or replace the timer valve
Check that the pilot valve spool returns to neutral.
• Temporarily swap the left/right swivel relief valves.
[Assessment]
If the problem changes sides: swivel relief valve faulty
If problem is the same: the main spool is sticking or damaged or the
anticavitation valve and/or swivel motor are faulty
• Clean or replace the anticavitation valve
[Assessment]
If problem is not resolved: the main spool is sticking or damaged or
the swivel motor is faulty
• Measure the drain volume
• Inspect the main spool or replace the valve
1. Take the main spool out of the control valve and clean it.
2. After applying hydraulic oil, check whether it slides properly and
return to the control valve.
Remedy
• Inspect the sub and main spools or replace the valve
1. Take the spool out of the control valve and clean it.
2. After applying hydraulic oil, check whether it slides properly and
return to the control valve.
3-S169
HYDRAULIC SYSTEM
Notes
RY9212148HYS0368US0
Notes
RY9212148HYS0369US0
KiSC issued 08, 2015 A