11-3
TROUBLESHOOTING
4. Control Lever
Problem
Cause
Solution
Hard to move
Rusted joint
* Lubricate or repair
Worn pusher
* Replace
Does not move smoothly
Worn pusher
* Repair or replace
Faulty pilot valve
* Replace
Does not return to neutral
Faulty pilot valve
* Replace
The lever is tilted in the neutral
position due to increase in play
Worn joint
* Repair or replace
Faulty pilot valve
* Replace
The lever is not held with
magnetic detent.
Faulty magnetic solenoid
* Replace
Faulty sensor
* Replace
5. Hydraulic System
After the machine has been kept stowed 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.
Problem
Cause
Solution
Loader front and travel
functions are 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
* Clean, 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 leaf due to damage to cylinder rod
* Repair, Replace
Oil overheats
Clogged oil cooler
* Clean, Replace
Slow fan speed
* Repair, Replace motor and pump
Weak tension of engine fan belt
Adjust
Oil leak from low pressure hose Loose clamp
Retighten
Faulty suction manifold
* Repair, Replace
f
NOTE: * Consult the nearest authorized dealer.
Summary of Contents for ZW 550-6
Page 4: ......
Page 10: ...CONTENTS SPECIFICATIONS 12 1 Specifications 12 1 Intended Use 12 1 INDEX 14 1 ...
Page 12: ...MACHINE NUMBERS 2 Aftertreatment Device SCR TYPE MFG NO DOC TYPE MFG NO 95Z7B SCR4 95Z7B SCR4 ...
Page 54: ...SAFETY LABELS S 42 2 25 7 4 1 26 1 8 9 5 6 11 12 10 24 115Z7B S 42US ...
Page 148: ...OPERATOR S STATION 1 84 MEMO ...
Page 208: ...OPERATOR S STATION 1 144 MEMO ...
Page 210: ...BREAK IN 2 2 MEMO ...
Page 226: ...OPERATING THE ENGINE 3 16 MEMO ...
Page 274: ...OPERATING THE MACHINE 5 28 MEMO ...
Page 354: ...MAINTENANCE 7 70 MEMO ...
Page 418: ...9 4 MAINTENANCE UNDER SPECIAL ENVIRONMENTAL CONDITIONS MEMO ...
Page 422: ...10 4 STORAGE MEMO ...
Page 428: ...11 6 TROUBLESHOOTING MEMO ...
Page 430: ...SPECIFICATIONS 12 2 MEMO ...
Page 438: ...INDEX 14 8 ZW550 6 US MEMO ...