TROUBLESHOOTING
11-4
Hydraulic System
When the machine is stored without operation, air mixed in hydraulic oil will become separated and will accumulate
in the cylinder upper sections, causing a delay in the response time of the machine movement or weak power
development.
In case these symptoms appear, repeatedly operate all actuators several times.
Problem
Cause
Solution
No hydraulic Functions
(Noise from pumps)
Faulty hydraulic pump
* Repair or replace
Lack of hydraulic oil
Refill
Broken suction pipe and/or hose
* Repair or replace
No hydraulic Functions
(Hydraulic pump noise remains
unchanged.)
Faulty pilot pump
* Replace
Faulty pilot shut-off solenoid valve
* Replace
Faulty wire harness (pilot shut-off solenoid
valve) pilot shut-off switch
* Repair or replace
The pilot control shut-off lever is in the LOCK
position.
Turn the pilot shut-off lever to
the UNLOCK position.
All actuators have no power.
Malfunction due to worn hydraulic pump
* Replace
Decreased main relief valve set pressure in the
control valve
* Adjust
Lack of hydraulic oil
Refill
Clogged suction strainer in the hydraulic oil
tank
Clean
Absorption of air from the oil suction side
Retighten
Only one side lever is inoperable or has
no power.
Faulty relief valve in the valve
* Repair or replace
Broken pipe and/or hose
* Repair or replace
Loose pipe line joint
Retighten
Broken O-ring at pipe line joint
* Replace
Faulty hydraulic pump
* Repair or replace
Faulty pilot valve
* Replace
Faulty pilot circuit line
* Repair or replace
Faulty pilot solenoid valve
* Repair or replace
* Mark: Consult your authorized Hitachi dealer.
Содержание Zaxis 33U-5A
Страница 4: ......
Страница 10: ...MACHINE NUMBERS 2 Engine TYPE MFG NO Travel Motor TYPE MFG NO MADB 00 020 MADC 00 010 M1M0 00 004 ...
Страница 11: ...MACHINE NUMBERS 3 Swing Motor TYPE MFG NO ZX65USB 5A ZX33U 5A 38U 5A 48U 5A 55U 5A MADB 00 005 MADC 00 001 ...
Страница 57: ...SAFETY SIGNS S 45 SS4604981 MADG 00 007 ZX33U 5A 38U 5A ZX65USB 5A ZX48U 5A 55U 5A MADB 00 010 MADC 00 012 ...
Страница 66: ...SAFETY SIGNS S 54 MEMO ...
Страница 104: ...OPERATOR S STATION 1 38 Radio Cab equipped machine Optional 1 Radio Clock 1 MADB 01 005 ...
Страница 114: ...BREAK IN 2 2 MEMO ...
Страница 160: ...OPERATING THE MACHINE 5 28 MEMO ...
Страница 270: ...MAINTENANCE 7 102 MEMO ...
Страница 272: ...MAINTENANCE UNDER SPECIAL ENVIRONMENTAL CONDITIONS 9 2 MEMO ...
Страница 274: ...STORAGE 10 2 MEMO ...