TROUBLESHOOTING
11-5
Problem
Cause
Solution
Only one actuator is inoperable.
Broken control valve spool
* Replace
Embedded foreign matter in valve spool
* Repair or replace
Broken pipe and/or hose
* Repair or replace
Loose pipe line joint
Retighten
Broken O-ring at pipe line joint
* Replace
Broken actuator
* Repair or replace
Faulty pilot valve
* Replace
Faulty pilot circuit line
* Repair or replace
Only one cylinder is inoperable or has
no power.
Broken oil seal in cylinder
* Repair or replace
Oil leak due to damage to cylinder rod
* Repair or replace
Faulty pilot valve
* Replace
Faulty pilot circuit line
* Repair or replace
Low set pressure of main or port relief valve
(boom, arm and bucket)
* Adjust and replace
Hydraulic oil temperature increases.
Stained oil cooler
Clean
Insufficient engine fan belt tension
Adjust
Oil leak from low pressure hose
Loose clamps
Retighten
* Mark: Consult your authorized Hitachi dealer.
Summary of Contents for Zaxis 33U-5A
Page 4: ......
Page 66: ...SAFETY SIGNS S 54 MEMO ...
Page 104: ...OPERATOR S STATION 1 38 Radio Cab equipped machine Optional 1 Radio Clock 1 MADB 01 005 ...
Page 114: ...BREAK IN 2 2 MEMO ...
Page 160: ...OPERATING THE MACHINE 5 28 MEMO ...
Page 270: ...MAINTENANCE 7 102 MEMO ...
Page 272: ...MAINTENANCE UNDER SPECIAL ENVIRONMENTAL CONDITIONS 9 2 MEMO ...
Page 274: ...STORAGE 10 2 MEMO ...