155
Lower
Fault Possible cause Remedy
Platform does not come
down or too slowly, but open-
ing operation works
Flow valve R 1 or R 2 at lift
cylinder stuck or defective
Clean or replace
Seating too tight Grease all seating points
Hydraulic oil too thick
Change oil, use oil grade as
recommended
Platform does not come
down when operated with
foot controls
The foot controls were actu-
ated too fast (less than 1 s) or
too slow (more than 3 s) after
each other
Release both foot controls,
wait a few seconds, and re-
peat procedure
Foot control defective
Disconnect plug connection
in the platform, check foot
controls with continuity tes-
ter
Cable no. 2 to platform defec-
tive
Actuate both foot controls
and check the voltage at
plugs J 3/6 and J 3/5 on the
PC board using a test lamp
Platform does not come
down when operated with lat-
eral operating element
Rotary switches, pushbut-
tons, or toggle switches de-
fective
Use test lamp to check con-
tacts in operating element ac-
cording to circuit diagram,
use ground connection JK at
PC board
PC board does not deliver
output at J 4/15
Disconnect plug J 4, check
terminal 15 with test lamp
PC board does not deliver
output at J 1/12
Disconnect plug J 1, check
terminal 12 with test lamp
No voltage at valve plug S 1
or S 2, defective cable
Check with test lamp
Valve S 5 in unit does not
switch on
Check with test lamp
Platform tilts during lowering
Lift arms switch b13 misad-
justed
Adjust
Platform tilts automatically
Solenoid valves S 3 and S 4
at tilt cylinder contaminated
or defective
Clean or replace
Piston seal in tilt cylinder de-
fective
Replace
Platform comes down auto-
matically
Solenoid valves S 1 and S 2
at lift cylinder contaminated
or defective
Clean or replace
Betriebsanleitung_Hubladebuehnen_EN.book Seite 155 Donnerstag, 15. August 2019 4:04 16
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