5. Problems, causes, actions
17
Rev.D 2013_03_en
Problem
Possible cause
Actions
Control unit does not work
. A
buzzer sounds.
Runways misaligned. Misa-
lignment protection activated.
Consult maintenance contractors
(
Chapter 6. Authorized lowering).
Lowering process stops abrupt-
ly.
A buzzer sounds, control unit is
out of order.
Cable too slack.
Cable broken.
1.
Switch main switch to "OFF
“ and
lock it.
2.
Consult maintenance contrac-
tors. Change the cable.
The main lift does not react
when being lowered.
Only rolling jack can be low-
ered.
A buzzer sounds.
Cable too slack or damaged.
Slack cable switch activated.
1.
Switch main switch to "
OFF“ and
lock it.
2.
Consult maintenance contrac-
tors. Tighten and adjust cable
(
Chapters 11.11 und 13.4).
Restart.
The process stops after a few
centimeters when lowering into
the lock position.
Pneumatic solenoid valve not
supplied with compressed air.
Check compressor connection.
Lift button does not work.
Main lift or rolling jack:
Runways do not move up.
Hydraulic oil level too low.
1.
Refill hydraulics up to gauge
mark (
Chapter 9.4).
2.
Check with dipstick.
Attention: Using rapeseed based oil
destroys the seal.
Use only biodegradable oils (HEES-
oils based on synthetic esters).
The water content of the oil may not
exceed 2 %.
Do not mix bio-oils with mineral oils.
Runways do not lift with a load.
They do however rise without a
load.
The lift is overloaded.
Rated load capacity exceeded,
maybe on one runway.
Hydraulic pressure incorrect-
ly set on pressure control
valve.
1.
Check vehicle weight.
If necessary re-position the ve-
hicle (
Chapter 2.3.
rated weight distribution).
2.
Correct setting on pressure con-
trol valve.
Power failure on main lift which
is locked in the latch bars.
No mains supply.
Can only be lowered with manual
pump and optional hydraulic power
unit.