4
|
01252 359760 • ajproducts.co.uk
7. MALFUNCTIONS AND THEIR CAUSES
8. DISPOSAL
Failure
Cause
Elimination
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
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)
After placing out of service, the high-lift pallet truck parts must be disposed of or recycled in accordance with legal provisions.
