158
Lift
(platform moves up to loading edge)
Fault Possible cause Remedy
Platform does not lift up
Rotary switches, pushbuttons,
or toggle switches defective
Use test lamp to check contacts
in operating element according
to circuit diagram, use ground
connection JK at PC board
PC board does not deliver out-
put at J 1/3
Check PC board according to
circuit diagram at plug J 1/3
with test lamp
Motor contactor in unit does not
switch on or is defective
Check motor contactor with test
lamp
Platform is not lifted up
although hydraulic unit
is running
Directional valve S 5 stuck or
defective
Clean or replace
Solenoid valves S 1 and S 2 at
lift cylinder contaminated or de-
fective
Clean or replace
Suction filter at pump contami-
nated
Clean or replace
Platform overloaded
Reduce load according to load
diagram
Hydraulic pump defective Replace
Electric motor defective Replace
Pressure splitter contaminated
or defective
Clean or replace
Pressure relief valve misad-
justed or defective
Adjust and lock the valve or re-
place it
Close
(platform closes)
Fault Possible cause Remedy
Platform does not
close
Rotary switches, pushbut-
tons, or toggle switches de-
fective
Check contacts in operating ele-
ment accordign to circuit diagram
using test lamp
PC board does not deliver out-
put at J 1/3 or J 1/1
Check PC board according to cir-
cuit diagram at plug J 1/3 and 1/12
with test lamp
Motor contactor or valve S 5 in
unit do not switch on
Check with test lamp
In its closed end posi-
tion the platform does
not reach the vehicle
loading floor height
End of box insufficiently rein-
forced
Reinforce box according to the de-
tails in assembly drawing
Bearings worn out (after lon-
ger usage)
Replace bearing pins, bearing
bushes
Betriebsanleitung_Hubladebuehnen_EN.book Seite 158 Donnerstag, 15. August 2019 4:04 16
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