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TROUBLESHOOTING CHART
Symptom(s)
Forks will not rise when
handle is pumped
Forks drop immediately
after pumping up
Leaks
Forks rise when control
lever is in the NEUTRAL
or "center" position
Forks cannot be lowered
to the minimum height
Possible Cause(s)
1. When load exceeds rated capacity the
safety valve will prevent the unit from
lifting.
2. Control lever is not pushed down into
the "RAISE" position
3. Air has entered the hydraulic system
4. Up/Down control assembly out of
adjustment
5. Up/Down control assembly broken
6. Lowering lever out of adjustment
7. Low oil level
8. Pump valve has failed
1. Pump valve components have failed
Example: Spring has fatigued / cracked or
valve seat / spindle has lost sealing ability
2. The hydraulic oil has impurities that
have clogged the control valve seat
3. Up/Down control assembly out of
adjustment
1. Worn or damaged seals (oil leak will be
evident)
2. Pump unit is damaged or crack
1. Control lever is not in "Neutral" or
center position
2. Neutral position adjustment required
1. Too much hydraulic oil
2. Push rods damaged
3. Frame is damaged / bent
Corrective Action(s)
1. Reduce load. Load weight cannot
exceed 3800 pounds.
2. Move the control lever down into the
"RAISE" position and pump the handle
3. Bleed air from system, see
maintenance section
4. Adjust, see control lever adjustment
section
5. Replace Up/Down control assembly.
See pump assembly parts lists
6. Adjust lowering lever set screw, see
control lever adjustment section
7. Add hydraulic oil, see maintenance
section
8. Replace pump valve assembly, see
pump assembly parts
1. Replace valve assembly, see pump
assembly parts list
2. Drain oil, flush and clean control valve
and refill with clean / new hydraulic oil.
3. Adjust, see control lever adjustment
section
1. Replace seals, see pump assembly
parts list
2. Replace pump assembly
1. Move control lever into the "Neutral" or
center position
2. Adjust, see control lever djustment
section
1. Drain small amount of hydraulic oil
and retry.
2. Replace push rods, see frame
assembly parts list
3. Replace frame assembly / pallet truck
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