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01-2811700 • ajproducts.ie
9. MALFUNCTIONS AND THEIR CAUSES
Failure
Cause
Elimination
Motor and hydraulic pump does not operate
Defective fuse
Replace the fuse
Loose or unconnected plug
Reconnect
Motor is burned out
Replace motor
The high-lift pallet truck does not lift the load, alt-
hough the pump is working perfectly
Load is too heavy, overload valve is
actuated
Reduce the load
Lowering valve does not close any more or the valve
face is not sealed because of
dirt
Clean or replace it
Electric circuit is disconnected
Check the wiring
Electromagnetic switch KM is defective
Replace KM
Up switch is obstructed resp.defective
Check resp. replace
the switch
Hydraulic pump does not work
Check the pump
The high-lift pallet truck does not lower the load
The fork or other parts are obstructed
Check all moving
parts
The adjusting bolt or adjusting nut not
adjusted properly.
Adjust it properly
Raised load is lowered of its own
Leakage in the hydraulic system
Seal!
Lowering valve does not close any more
or the valve unit is not sealed because of dirt
Clean or replace
Incorrect valve set-up.
Adjust lowering
valve
Pressure relief valve (pump) is leaky
(pump turns slowly backwards.)
Clean or replace the
valve
Oil loss on hydraulic
cylinder
Sealing elements are worn
Replace sealing
elements
The raised load is
lowered too slowly
Temperature too low – the hydraulic
system oil is too thick
Find a warmer
location
Fork does not raise till upper position
Insufficient oil in the tank
Refill with oil (while
the fork is lowered)
Battery discharged
Charge the battery
Limit switch is not positioned
Reposition the limit
switch
Battery capacity to
low
Battery is not charged enough
Recharge
Battery is defective
Replace the battery
Battery can not be charged
Fuse is defective
Replace the fuse
Battery resp. charger defective
Replace battery resp.
charger
Too early battery discharge
Silted battery
Replace battery
Sulphating or other failure in the battery.
Replace battery
Accidental earth contact in the electric
system or battery.
Repair or replace
battery
10. DISPOSAL
After placing out of service, the high-lift pallet truck parts must be disposed of or recycled in accordance with legal provisions.
