11-2
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.
Faulty hydraulic pump
Lack of hydraulic oil
Broken suction pipe and/or hose
* Repair, Replace
Refill
* Repair, Replace
Faulty solenoid valve
FNR shift lever is in neutral.
* Replace
* Operate
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
* Replace
* Adjust
Refill
Clean
Retighten
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
* Replace
* Repair, Replace
* Repair, Replace
Retighten
* Replace
* Repair, Replace
Broken oil seal in cylinder
Oil leaf due to damage to cylinder rod
* Repair, Replace
* Repair, Replace
Stained oil cooler
Weak tension of engine fan belt
Clean
Adjust
Loose clamp
Faulty suction manifold
Retighten
* Repair, Replace
NOTE: * Consult the nearest Hitachi dealer.
Rusted joint
Worn pusher
* Lubricate or repair
* Replace
Worn pusher
Faulty pilot valve
* Repair or replace
* Replace
Faulty pilot valve * Replace
Worn joint
Faulty pilot valve
* Repair or replace
* Replace
Faulty magnetic solenoid
Faulty sensor
* Replace
* Replace
Items with * mark: Consult your nearest Hitachi dealer.
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