TROUBLESHOOTING
11-3
Hydraulic System
After the machine has been kept stored 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 operation or reducing cylinder power.
In case these symptoms appear, repeatedly operate all actuators several times.
Symptom
Cause
Solution
Loader front function is inoperable.
(Hydraulic pump noise level increases)
Faulty hydraulic pump
* Repair, Replace
Lack of hydraulic oil
Refill
Broken suction pipe and/or hose
* Repair, Replace
All actuators have no power.
Malfunction due to worn hydraulic pump
* Replace
Decrease in set pressure of main relief valve in
control valve
* Adjust
Lack of hydraulic oil
Refill
Trapped foreign matter in hydraulic oil tank
suction filter
Clean
Aeration in suction side
Retighten
Only one actuator is inoperable.
Broken control valve spool
* Replace
Trapped foreign matter in valve spool
* Repair, Replace
Broken pipe and/or hose
* Repair, Replace
Loose pipe line joint
Retighten
Broken O-ring at pipe line joint
* Replace
Broken actuator
* Repair, Replace
Only one cylinder is inoperable or has
no power.
Broken oil seal in cylinder
* Repair, Replace
Oil leak due to damage to cylinder rod
* Repair, Replace
Oil overheats
Contaminated oil cooler
Clean
Faulty fan motor and pump
* Repair, Replace
Abnormal fan rotation
* Repair, Adjust
Oil leak from low pressure hose
Loose clamp
Retighten
Faulty suction pipe
* Repair, Replace
* Consult your authorized Hitachi dealer.
Summary of Contents for ZW 310-6
Page 4: ......
Page 10: ...CONTENTS MEMO ...
Page 14: ...INTENDED USE 2 MEMO ...
Page 57: ...SAFETY SIGNS S 43 ZW310 6 SS 3777 2 ...
Page 59: ...SAFETY SIGNS S 45 ZW330 6 92Z7B S 40EU ...
Page 246: ...BREAK IN 2 2 MEMO ...
Page 280: ...DRIVING MACHINE 4 20 MEMO ...
Page 460: ...MAINTENANCE 7 146 MEMO ...
Page 464: ...MAINTENANCE UNDER SPECIAL ENVIRONMENTAL CONDITIONS 9 4 MEMO ...
Page 468: ...STORAGE 10 4 MEMO ...
Page 474: ...TROUBLESHOOTING 11 6 MEMO ...
Page 498: ...INDEX 14 6 MEMO ...
Page 502: ...CONFORMITY MEMO ...
Page 506: ......