Hitachi ZW180 Operator's Manual page 323

5. Drive Function
Problem
Steering wheel is heavy to
operate.
Steering wheel is rotated in
unexpected direction.
Accelerator pedal is heavy to
operate.
Accelerator pedal play is
large.
ZW220, ZW250
Parking brake
Does not work properly
ZW310
Parking brake
The brake is not released
(sticking, dragging).
ZW310
Parking brake
Does not work properly
Service brake does not work
properly
Service brake is dragged.
Service brake fluid decreases
(hydraulic oil).
Transmission is noisy.
Propeller shaft vibrates.
Propeller shaft is noisy
Front and/or rear axle is noisy Worn or broken gears
Front and/or rear axle does
not transmit power.
NOTE: * Consult the nearest Hitachi dealer.
6. 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
Faulty steering pump
Faulty steering device
Malfunction of steering cylinder
Relief valve set pressure reduction
Faulty steering column
Low tire air pressure
One side brake is applied or dragged.
Rusted joint
Worn joint
Worn brake disk and/or pads
Faulty parking brake solenoid valve
Oil leak due to failure of D-ring on the park-
ing brake piston
Faulty brake disk
Damaged disk brake spring
Faulty disk brake
Scored or seized piston or worn disk
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 connec-
tor
Oil leak due to brake piston seal (inside axle)
Lack or deterioration of gear oil
Worn inner parts in transmission
Broken gear or bearing
Bent propeller shaft
Loosen parts, Loss of balance
Excessively worn spline
Worn or seized spider bearing
Loosen parts
Insufficient greasing
Lack or deterioration of gear oil
Worn bearings, Expanded play
Expanded play on shaft spline
Broken axle
Broken gears
11-3
Solution
* Repair, Replace
* Repair, Replace
* Repair, Replace
* Adjust
* Inflate
* Adjust
* Lubricate, Repair
* Replace, Repair
* Replace
* Repair or replace
* Repair or replace
* Repair or replace
* Replace
* Replace
* Repair or replace
* Repair or replace
* Repair. Bleed air
* Repair or replace
* Repair or replace
* Retighten or repair
* Retighten or repair
Refill, replace
* Repair, Replace
* Repair, Replace
* Repair, Replace
* Retighten, Adjust
* Replace
* Replace
* Retighten
Grease
* Replace
Refill, Replace
* Replace
* Repair, Replace
* Repair
* Repair