1
Check the hydraulic oil
level
Insufficient
2 Add hydraulic oil.
Sufficient
Abnormal noise from the
piston pump
Yes
Suction line faulty
and hose.
No
Action appropriate to the
4
Check the main relief
valve
Faulty
Repair or replace the main re-
lief valve.
Normal
5
Repair or replace the faulty
piston pump.
1. Check the hydraulic oil level.
“4. Disassembly and assembly, Hydraulic oil
tank”
2. Add hydraulic oil.
“No operation is possible, 1. Check the hydraulic
oil level.”
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-
-
“4. Disassembly and assembly, Hydraulic
tank”
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