11-7
TROUBLESHOOTING
Swing Function
Problem Cause Solution
Upperstructure does not swing. Faulty swing parking brake * Repair or replace
Faulty swing parking brake release valve * Repair or replace
Broken swing motor * Repair or replace
Faulty pilot valve * Replace
Faulty pilot circuit line * Repair or replace
Swing is not smooth. Worn swing gear * Repair or replace
Damaged swing bearing and bearing balls. * Repair or replace
Lack of grease Refill
Inversion protective valve * Repair or replace
Items with * mark: Consult your authorized dealer.
Just after the control valve, swing motor relief valve and/or the swing motor is replaced, a noise may be emitted and/or
operation may not be performed smoothly due to air trapped in the hydraulic line.
Slowly continue to operate the machine for approx. 10 minutes to bleed air.
After repair work is complete, be sure to check the oil level in the hydraulic oil tank. Refill hydraulic oil as needed.
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