165
Lift
(platform moves up to loading edge)
Fault Possible cause Remedy
Platform does not lift up
Pushbutton 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
Thermoswitch tripped Allow motor to cool down
Platform is not lifted up
although hydraulic unit
is running
Directional valve S 3 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
Lower
(platform moves down until reaching the ground)
Fault Possible cause Remedy
Platform does not come
down
Flow valve R 1 or R 2 at lift cyl-
inder stuck or defective
Clean or replace
Slide bearing sluggish
Clean and lubricate slide bear-
ing
Hydraulic oil too thick
Change oil, use oil grade as rec-
ommended
Solenoid valve S 1 or S 2 defec-
tive
Clean or replace
Betriebsanleitung_Hubladebuehnen_EN.book Seite 165 Donnerstag, 15. August 2019 4:04 16
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