5. Problems, causes, actions
19
Rev.D 2013_03_en
Problem
Possible cause
Actions
Lift speed
too low.
Air has mixed with oil
or is being sucked in.
Hydraulic hose is loose.
Depending on cause:
●
Change oil (
Chapter 9.4).
●
Tighten fittings on suction pipe.
●
Secure the oil return tube.
Leak in hydraulic power unit
Hydraulic pump is faulty.
Repair hydraulic pump.
Fault on hydraulic pump.
Pressure control valve set
incorrectly.
Overloading (vehicle too
heavy).
Depending on cause:
●
Correct the pressure control
valve.
●
Replace hydraulic pump. Do
not put excessively heavy vehi-
cles onto the lift
.
Hydraulic oil leaking from the
filler/breather cap.
Air has mixed with the oil or is
being sucked in.
Oil return line is loose.
Hydraulic hose is damaged.
Depending on cause:
●
●
Tighten fittings on suction pipe.
●
Attach return line.
●
Replace hydraulic hoses.
Runways lift unevenly
(Height difference in runways).
Cables are out of adjustment
Lift not leveled.
Floor is uneven.
Depending on cause:
●
Correct the cable tension
(
Chapter 11.11 and 13.4).
●
Reset and accurately level the
lift.
●
Place spacers/shims under-
neath (
Chapter 13. Commis-
sioning).
Anchor is loose.
Assembly fault,
for example drill holes are too
big or load capacity of concrete
floor is inadequate.
Depending on cause:
●
Repair the lift.
●
Re-install
(
Chapters 11 to 13). Follow
installation requirements.
Runways either do not lift to full
rise or they chatter during lifting.
Hydraulic oil level too low.
Check oil level. If required bleed
the hydraulic cylinder (
Assem-
bly manual).
Runways do not lower.
Inadequate air supply.
Locking latches are offset.
Depending on cause:
●
Check air pressure and adjust
of necessary (6 ... 8 bar).
●
Check whether air lines are
leaking or crushed.
●
Check locking mechanism,
repair if necessary.
