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Parts List & Operating Instructions
Repair procedures must be performed in a dirt-free environment by qualified personnel who are familiar with this equipment.
Trouble
Erratic action
Jack does not lift
Jack lifts only partially
Jack advances slowly
Jack lifts load, but doesn't hold
Jack leaks oil
Jack will not retract
Jack retracts slowly
© 2004 SPX Corporation
Troubleshooting Guide
Cause
1. Air in system
2. Oil viscosity too high
3. Internal leakage in cylinder
4. Cylinder sticking or binding
1. Release valve is open
2. Low/no oil in reservoir
3. Air-locked system
4. Load is above capacity of jack
5. Delivery valve and/or bypass
valve not working correctly
6. Packing worn out or defective
1. Too much or not enough oil
1. Air in system
2. Pump not working correctly
3. Leaking seals
1. Cylinder packing is leaking
2. Valve not working correctly (suction,
delivery, release, or bypass)
3. Air-locked system
1. Worn or damaged seals
1. Release valve is closed
1. Cylinder damaged internally
2. Link section is binding
Form No. 525814
Solution
1. Refer to section titled "Bleeding Air from the
Fork Lift Jack."
2. Change to a lower viscosity oil.
3. Replace worn packings. Look for
excessive contamination or wear.
4. Look for dirt, gummy deposits, leaks,
misalignment, worn parts, defective packings.
1. Close release valve.
2. Fill with oil and bleed system.
3. Bleed system.
4. Use correct equipment.
5. Clean to remove dirt or foreign matter.
Replace oil.
6. Repair power unit.
1. Check oil level.
1. Refer to section titled "Bleeding Air from the
Fork Lift Jack."
2. Repair power unit.
3. Repair power unit or seals.
1. Repair power unit or seals.
2. Inspect valves. Clean and repair seat
surfaces.
3. Bleed system.
1. Repair power unit or seals.
1. Open or clean release valve.
1. Send jack to OTC authorized service center
for repair.
2. Lubricate link section.
Sheet No.
4 of 4
Issue Date: Rev. B, 6/07/04
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