Air Hydraulic Jack-Trouble Shooting

- May 28, 2018 -

SymptomCausesSolution
Jack does not lift1. Control Valve in wrong   position.
2. Low/no oil in reservoir.
3. Load is about capacity of jack.
4. Delivery valve and/or bypass    valve working incorrectly.
5. Seals worn out or defective.

1. Move control valve to UP   position. 

2. Fill with oil and bleed system.

3. Use correct equipment.
4. Clean to remove dirt or foreign matter. Replace oil.
5. Install appropriate seal kit.
Jack lifts only partially1. Too much or not enough oil.1. Check oil level.
Jack lifts slowly1. Pump not working   correctly.
2. Leaking seals.
3. Air pressure of pump not working normally.
1. Install appropriate seal   kit.
2. check the pump pressure in the rated range(0.8-1.2 Mpa).
Jack   lifts load, but doesn't hold1. Cylinder packing is   leaking.
2. Valve not working correctly (suction, delivery,release,bypass).
1. Replave with seal kit.
2. Inspect valve. Clean and repair seat surfaces.
Jack leaks oil1. Worn or damaged seals.
2. Oiling too much
1. Replave with seal kit.
2. Oil can't exceed 2.5L.
Jack not down1. Control valve in wrong   position.
2. O-ring need to be replaced.
1. Move control valve to   DOWN  position.
2. Replace #5 O-ring.
Jack retracts slowly1. Cylinder damaged   internally.
2. Air pressure of pump not working normally.
1. Send jack to service   center.
 2. Check the pump pressure in the rated ranged(0.8-1.2 Mpa).


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