Hitachi ZW 120-6 Operator's Manual page 353

Service Brake
Symptom
Service brake does not work properly.
Brake is dragged.
Lack of brake fluid (hydraulic oil)
Transmission
Symptom
Transmission is noisy.
Oil overheats
Propeller Shaft
Symptom
Propeller shaft vibrates.
Propeller shaft is noisy.
Front Axle, Rear Axle
Symptom
Front and/or rear axle is noisy.
Front and/or rear axle does not
transmit power.
Others
The machine may have a noise, excessive vibration, and abnormal smell when any trouble occurs.
Always beware of the machine conditions during operation.
TROUBLESHOOTING
Cause
Malfunction of brake valve
Oil leak from brake line, Air mixing
Malfunction of brake valve
Faulty brake pedal
Oil leak from brake line and/or hose connector * Retighten or repair
Oil leak due to brake piston seal (inside axle)
Cause
Lack or deterioration of gear oil
Worn inner parts in transmission
Broken gear or bearing
Abnormal fan rotation
Cause
Bent propeller shaft
Loosened parts, Loss of balance
Excessively worn spline
Worn or seized spider bearing
Loosened parts
Insufficient greasing
Cause
Worn or broken gears
Lack or deterioration of gear oil
Worn bearings, Excess play
Excess play on shaft spline
Broken axle
Broken gears
11-5
Solution
* Repair, Replace
* Repair, Bleed air
* Repair, Replace
* Repair, Replace
*Repair, Replace
* Consult your nearest authorized dealer.
Solution
Refill, change
* Repair, Replace
* Repair, Replace
* Repair, Adjust
* Consult your nearest authorized dealer.
Solution
* Repair, Replace
* Retighten, Adjust
* Replace
* Replace
Retighten
Grease
* Consult your nearest authorized dealer.
Solution
* Replace
Refill, Replace
* Replace
* Repair, Replace
* Replace
* Replace
* Consult your nearest authorized dealer.