Pallet Jack Hydraulic Unit Inspection Tips

Inspection Tips for Hydraulic Units

Inspect the outside of the pallet jack hydraulic pump for oil leaks. Test the hydraulic unit, under a load, to determine if there is a problem. This can be done by lifting a heavy pallet and letting it stand for 15-20 minutes. Use UNI-HO hydraulic oil. Do not use automotive oil or hydraulic brake fluid.

Possible Problems with Pallet Jack Hydraulic Unit:

Jack fails to lift load:
• Air Lock in Pump - Place the control lever into release position, then pump the handle rapidly about 10-15 times. (5 minutes)
• Low Fluid Level - With the jack in a lowered position, remove filler plug. Using UNI-HO oil, fill the reservoir until the oil is level with the fill plug hole. Bleed the unit. Replace the filler plug, creating a snug fit. Do not over-tighten.

Jack fails to lower:
• Look for any bent frame parts (lifting link, push rod, etc.). Bent frame parts need to be replaced.
• The hand control may be out of adjustment.

Jack lifts in short increments:
• Lack of oil pressure – check fluid level.
• Reservoir filler plug leaking - Replace the washer and filler plug and replenish oil as necessary.

One fork lifts, the other does not:
Check for damage in the following areas and their attached parts:
• Lifting link (lifting link pin and traverse shoulder pin)
• Pushrod
• Load roller bracket (pivot axle)