25
The motor is not running.
• Incorrect supply voltage to the
motor.
• Wiring loose.
• Faulty motor.
• Faulty limit switch.
Depending on cause:
• Supply the correct voltage to the
motor.
• Check all wiring connections and
repair or insulate if necessary.
• Test function of the Up switch.
Replace if necessary.
• Check function of overhead limit
switch. Replace if necessary.
• Change hydraulic power unit for
motor.
Up button does not work.
Runways do not move up(main
lift or lifting table).
• Lowering valve is open.
• Pump is sucking air.
• Suction pipe disconnected
from pump.
Depending on cause:
• Clean or replace lowering valve.
• Tighten fittings on suction pipe.
• Replace suction pipe.
Runways do not lift with a
load. Runways rise however
without a load.
• Insufficient voltage supplied
to motor hydraulic power unit.
• Lowering valve is dirty.
• Release valve incorrectly set.
Depending on cause:
• Supply the correct voltage to the
motor.
• Clean the lowering valve.
• Adjust release valve.
Runways lowering slowly.
• Check valve is dirty.
• Lowering valve dirty.
• External oil leaks on pipes
and hoses.
• Dirty installation space (check
valve and lowering valve).
Depending on cause:
• Clean check valve.
• Clean lowering valve.
• Eliminate leaks.
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 vehicles onto
the lift.
