Hitachi ZW 120-6 Operator's Manual page 352

Drive Function
Steering System
Symptom
Steering wheel is heavy to operate.
Steering wheel turns in unexpected
direction.
Accelerator Pedal
Symptom
Heavy to operate
Accelerator pedal play is excessive.
Parking Brake
Symptom
Parking brake is dragging.
Parking brake does not work properly.
TROUBLESHOOTING
Cause
Faulty hydraulic pump
Faulty steering device
Relief valve set pressure reduction
Faulty steering column
Faulty steering device
Cause
Rusted joint
Worn joint
Cause
Oil leak due to worn parking brake piston
D-ring
Faulty disk brake
Faulty parking brake solenoide valve
Worn or damaged brake spring in brake
piston
Faulty disk brake
Seized piston, worn disk
Faulty parking brake solenoide valve
11-4
Solution
* Repair, Replace
* Repair, Replace
*Adjust
* Repair, Replace
* Repair, Replace
* Consult your nearest authorized dealer.
Solution
* Lubricate, Repair
* Repair, replace
* Consult your nearest authorized dealer.
Solution
* Repair, Replace
* Repair, Replace
* Repair, Replace
* Replace
* Replace
* Repair, Replace
* Repair, Replace
* Consult your nearest authorized dealer.