166
Platform does not come
down when operated
with hand cable control
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 4/15
Disconnect plug J 4, check ter-
minal 15 with test lamp
No voltage at valve plug S 1 or
S 2, defective cable
Check with test lamp
Platform comes down
automatically
Solenoid valves S 1 and S 2 at
lift cylinder contaminated or de-
fective
Clean or replace
Fold out
Fault Possible cause Remedy
Link bridge does not
fold out, motor is run-
ning
Solenoid valves S 10 and S 11
do not open
Clean or replace
Solenoid valve S 7 does not
open
Clean or replace
Piston seal in tilt cylinder defec-
tive
Replace
Fold in
Fault Possible cause Remedy
Link bridge does not
fold in, motor is running
Solenoid valve S 7 does not
open
Clean or replace
Solenoid valve S 12 does not
open
Clean or replace
Solenoid valve S 13 does not
open
Clean or replace
Piston seal in tilt cylinder defec-
tive
Replace
Lower
(platform moves down until reaching the ground)
Fault Possible cause Remedy
Betriebsanleitung_Hubladebuehnen_EN.book Seite 166 Donnerstag, 15. August 2019 4:04 16
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