ATD Tools ATD-7391A, Owner'S Manual, Page: 4 / 7

5-2. Lowering jack
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is turned.
6. MAINTENANCE
IMPORTANT:
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7. TROUBLESHOOTING
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Trouble Cause Solution
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 system.
4. Load is above capacity of jack. 4. Use correct equipment
5. Delivery valve and/or bypass valve not working correctly. 5. Clean to remove dirt or foreign matter.
6. Packing worn out or defective. 6. Install seal k it
Jack lifts only partially 1. Too much or not enough oil. 1. Check Oil level
Jack advances slowly 1. Pump not w o rking correctly. 1. Install seal k it, or replace power unit.
1. Cylinder packing is leaking. 1. Install seal k it
2. Valve not working correctly (suction, delivery, release, or
bypass). 2. Inspect valves. Clean and repair seat
surfaces.
3. Air-locked system. 3. Bleed system.
Jack leaks oil 1. Worn or damaged seals. 1. Install seal k it.
Jack will not retract 1. Release valve is closed. 1. Open or clean release valve.
Jack does not lift
Jack lifts load, but doesn't hold
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