5-4
5
OVERALL MACHINE
TROUBLESHOOTING
All systems working, but insufficient force.
1
Check the hydraulic oil
level
Insufficient
2 Add hydraulic oil.
Sufficient
3
Abnormal noise from the
piston pump
Yes
Suction line faulty
Replace the seal tape, O-ring
and hose.
No
Frothing in the tank
Action appropriate to the
cause of the frothing.
4
Check the main relief
valve
Faulty
Repair or replace the main re-
lief valve.
Normal
5 Piston pump is faulty
Repair or replace the faulty
piston pump.
1. Check the hydraulic oil level.
“4. Disassembly and assembly, Hydraulic oil
tank”
2. Add hydraulic oil.
“5-3”
3. Abnormal noise from the piston pump.
The noise is likely to be caused by cavitation in the
pump, due to a faulty suction line. Check the follow-
ing.
a. The line for sucking the hydraulic oil
• Apply grease or oil on the suspected faulty sec-
tions and check for a change (check if air is being
sucked).
b. Clogging in the suction filter
c. Pressurize the hydraulic tank.
“4. Disassembly and assembly, Hydraulic
tank”
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