Service manual

Solution2: Jack is low on oil. Add oil. (Dexron III AFT or equivalent)

Problem: Carriage is lowering on its own.

Solution1: Check that there are no oil leaks by checking around the column. If so, repair the leak condition.

Solution2: If Solution 1 does no produce results, check for leakage of cylinder piston seals. Remove black

plastic vent tube from power unit reservoir tank port and see if any fluid is flowing out. If so, cylinder piston

seals are leaking. Contact Mohawk’s Service department.

Solution3: If Solution 2 does not produce results, the lowering valve(s), located on the power unit may have

collected some dirt, preventing them from sealing properly. Make sure that the carriage is lowered to floor

level in order that there is no pressure in the system. Disconnect the power so that no one can start the unit.

You can now remove the lowering valve(s). Disconnect the electrical leads from the solenoid using a

screwdriver to remove the screw holding the two mating connectors. Remove the lowering valve(s) from the

power unit and check to see that there is no foreign material in the valve ends, which prevent the balls from

sealing. Remove the foreign material. If you cannot find any problem, replacement of valve may be

required. Contact Mohawk’s Service department.

Solution4: If Solution 3 does not produce results, the power unit’s main load holding check valve may have

collected some dirt, preventing it from sealing properly. Make sure that the carriage is lowered to floor level

in order that there is no pressure in the system. Disconnect the power so that no one can start the unit. You

can now remove the check valve components and check to see if there is any foreign material in the valve

cavity to prevent the ball from sealing. Remove the foreign material. If you cannot find any problem, re-

seating of the valve, or replacement of valve may be required. Contact Mohawk’s Service department.