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.
Trouble shooting tips for possible problems with your hydraulic unit:
Jack fails to lift load:
- Air lock inside pump - place the control lever into release position, then pump the handle rapidly about 10-15 times.
- Low fluid level - with the jack lowered, remove filler plug. 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 handle 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)
Note:
Always use SP UNI-HO hydraulic oil. Do not use automotive oil or hydraulic brake fluid.
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