41
Symptoms
Cause
Solution
The height sensor shows an
unstable number
Check or replace the sensor
The cable to the height sensor is
disconnected or loose
Check the connection for proper
function
The oil in the hydraulic unit is
insufficient
Add some hydraulic oil
The lowering valve of a hydraulic
power unit does not close
properly
Check and clean if dirty, or replace
if faulty
The emergency lowering screw in
one of the power packs does not
close
Tighten the screw again
The system is not synchronized
The filter of the suction pump in
one of the power packs is dirty
Check and clean if necessary
The oil in the tank is not sufficient Add oil to the tank
The pump is defective
Check the pump and replace if
necessary
The lifting capacity is not
sufficient
The pressure relief valve is not
adjusted correctly
Adjust the valve correctly
The motor does not stop when
the lifting fork has reached the
maximum height
The upper limit switch does not
work
Check the limit switch and replace
it if necessary
Leakage or presence of air in the
hydraulic circuit
Bleed the hydraulic system
The pump filter is dirty
Check and clean if necessary
The lift fork does not raise or
lower smoothly
The pump seal is defective
Check the seal and replace it if
necessary
The power switch is not turned on Turn on the switch
No power supply available
Check power supply and restore if
necessary
Nothing is shown on the display
The cables are disconnected
Replace the cables
4.5
Maintenance and service instructions
All maintenance and service work should be carried out at least according to
® Copyright ATH-Heinl GmbH & CO.KG, All rights reserved / Misprints and technical changes reserved
Release date: 10-2022 / Product manufacturer ATH-Heinl GmbH & CO. KG
