Hitachi ZW180 Operator's Manual page 322

4. Control Lever
Symptom
Hard to move
Does not move smoothly
Does not return to neutral
The lever is tilted in the neu-
tral position due to increase
in play
The lever is not held with
magnetic detent.
Items with * mark: Consult your nearest Hitachi dealer.
5. Hydraulic System
After the machine has been kept stowed for a long time, air
in the oil may be separated and accumulate in the upper
section in the cylinder, causing slow response time in opera-
tion or reducing cylinder power. In case these symptoms
appear, repeatedly operate all actuators several times.
Problem
Loader front and travel func-
tions are inoperable (hydrau-
lic pump noise level increas-
es).
Loader front and travel func-
tions are inoperable (hydrau-
lic pump noise level remains
unchanged).
All actuators have no power.
Only one actuator is inoper-
able.
Only one cylinder is inoper-
able or has no power.
Oil overheats
Oil leak from low pressure
hose
NOTE: * Consult the nearest Hitachi dealer.
TROUBLESHOOTING
Cause
Rusted joint
Worn pusher
Worn pusher
Faulty pilot valve
Faulty pilot valve
Worn joint
Faulty pilot valve
Faulty magnetic solenoid
Faulty sensor
Cause
Faulty hydraulic pump
Lack of hydraulic oil
Broken suction pipe and/or hose
Faulty solenoid valve
FNR shift lever is in neutral.
Malfunction due to worn hydraulic pump
Decrease in set pressure of main relief valve
in control valve
Lack of hydraulic oil
Trapped foreign matter in hydraulic oil tank
suction filter
Aeration in suction side
Broken control valve spool
Trapped foreign matter in valve spool
Broken pipe and/or hose
Loose pipe line joint
Broken O-ring at pipe line joint
Broken actuator
Broken oil seal in cylinder
Oil leaf due to damage to cylinder rod
Stained oil cooler
Weak tension of engine fan belt
Loose clamp
Faulty suction manifold
11-2
Solution
* Lubricate or repair
* Replace
* Repair or replace
* Replace
* Replace
* Repair or replace
* Replace
* Replace
* Replace
Solution
* Repair, Replace
Refill
* Repair, Replace
* Replace
* Operate
* Replace
* Adjust
Refill
Clean
Retighten
* Replace
* Repair, Replace
* Repair, Replace
Retighten
* Replace
* Repair, Replace
* Repair, Replace
* Repair, Replace
Clean
Adjust
Retighten
* Repair, Replace