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6
Troubleshooting
Numbers in parentheses refer to the item numbers on the parts breakdown, page 7.
Trouble Probable Cause Remedy
Release valve not properly closed. Tighten release valve knob (39).
No oil in system. Fill to prescribed level.
Jack is overloaded.
Remedy overload condition. Use jack with
proper capacity for the load.
Release Valve (52-54) or Safety Valve
(55-60) malfunctioning. Valve Ball not
properly seated.
Clean valves to remove dirt or foreign
matter and replace oil.
Jack will not lift.
Seal/gasket worn out or defective. Replace seal/gasket.
Jack will only lift part
way.
Oil level low or too high. Fill to proper level, or remove excess oil.
Release Valve (52-54) or Safety Valve
(55-60) malfunctioning. Valve Ball not
properly seated.
Inspect valves; clean and adjust seat
surface.
Jack will lift load, but will
not hold.
Seal/gasket worn out or defective. Replace seal/gasket.
Release valve (52-54) not opening. Clean and adjust Release Valve.
Reservoir is overfilled. Drain oil to proper level.
Jack will not lower after
unloading.
Linkages binding. Clean and lubricate moving parts.
Pump gasket (50) defective or Valves
malfunctioning.
Replace gasket and/or clean valves.
Oil level low, or dirty oil. Fill or replace oil.
Poor lift performance.
Air trapped in system. Bleed air from system.
Pump plunger (49) bent or marred. Replace pump plunger.
Jack Spring damaged. Replace spring.
Jack will not lower
completely.
Link section warped or deformed due to
possible over-loading.
Replace warped parts.
Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach our service department, call
1-800-274-6848 between 7:30 a.m. and 6:00 p.m. (CST), Monday through Friday. Having the Model
Number and Serial Number of your machine available when you call will allow us to serve you quickly and
accurately.