TROUBLE

CAUSE

REMEDY

Lift won’t raise at all

1. Low oil control stuck

2. Air pressure not getting to lift

3.  Worn or broken control valve component

1. Remove, replace low oil control or add oil

2. Check compressor, valves and/or filter

3. Replace valve and/or parts

Lift raises slow or won’t raise load

1. Insufficient air pressure

2. Compressor tank too small

3. Compressor tank full of water

4. Restriction or pipe line too small

5. Oil too heavy in viscosity

6. Air valve not working properly. (Plugged screen or worn rocker)

7. Load greater than lift capacity

8. Air supply line from compressor to lift too small

1. Check air compressor

2. Check specifications

3. Drain tank

4. Check pipe and size

5. Check and/or change oil

6. Clean screen or replace valve

7. Weigh vehicle, check specification

8. Replace piping with correct size

Lift raises slowly with air valve closed (Semi hydraulic)

1. Leak in air valve

1. Check intake port, repair or replace

Lift creeps down with air valve closed (Semi hydraulic)

1. Leak in air valve

2. Air leak in fill plug

3. Air leak in line from valve to cylinder.  Air leak in outer casing.

4. Leak at manual air bleed screw.

1. Check intake port, repair or replace

2. Apply soapy water and watch for bubbles after letting air into system.  Tighten.