Page No. 7
Issue Date: Rev 5 1 Sep. 2010
Parts List and Operating Instructions
Form No. 102948
TROUBLESHOOTING GUIDE
Repair procedures must be performed in a dirt-free environment by qualifi ed personnel who are
familiar with this equipment.
TROUBLE
CAUSE
SOLUTION
Erratic Action
1. Air in system.
1. With jack sitting on its base
and ram retracted, bleed
air by opening release
valve. Pump for 10
seconds.
2. Viscosity of oil to high.
2. Change to lower viscosity
oil.
3. Internal leakage in cylinder.
3. Replace worn seals. Check
for excessive contamination
or wear.
4. Cylinder sticking or binding.
4. Check for dirt, gummy
deposits, or leaks. Check
for misalignment, worn
parts, or defective seals.
Jack does not advance
1. Release valve is open.
1. Close release valve.
2. Low/no oil in reservoir.
2. Fill with oil and bleed
system.
3. Air-locked system.
3. Bleed the system.
4. Load is above capacity of
system.
4. Use correct equipment.
5. Improper horizontal
position.
5. Operates horizontally
ONLY
when fl at of casting is
downward (see Operating
Instructions section).
Jack only extends partially
1. Reservoir is low on oil.
1. Fill reservoir.
2. Piston rod is binding.
2. Check for dirt, gummy
deposits, or leaks. Check
for misalignment, worn
parts, or defective seals.
Jack advances slowly.
1. Pump not working correctly.
1. Rework pump.
2. Leaking seals.
2. Replace seals.
Jack advances but doesn’t
hold pressure.
1. Cylinder seals are leaking
1. Replace seals.
2. Pump check valve not
working correctly.
2. Clean/replace check valve.
3. Overload valve leaking or
not adjusted correctly.
3. Replace/adjust overload
valve.
Jack leaks oil
1. Worn or damaged seals.
1. Replace seals.
Jack will not retract or re-
tracts slowly
1. Release valve is closed.
1. Open release valve.
2. Cylinder damaged internally. 2. Send jack to authorized
service center for repair.
3. Reservoir too full.
3. Drain oil to correct level.
