Operating instructions and documentation
4.50H/ 4.50H plus
- 29 -
Problem: The lift does not lowered!
potential causes:
-
The lift is standing on a obstacle.
- The hydraulic valve is defective.
- The key switch is not active.
- The lift is in the ratchet.
6.1 Driving on an obstacle with the main lift
If the lift is running onto an obstacle during the lowering, it stops mechanically. In this case press
the override switch at the rail and turn the key on position ”
∆
” simultaneously until the obstacle can
be removed.
6.2 Emergency lowering in case of power failure or defective valve
In case of power failure or defective valves, the hydraulic valves of the lift will not open anymore.
Therefore the lift can not be lowered. In this case you can open the hydraulic valve manually and
lower the lift into lowest position, so the vehicle can be driven off.
The emergency lowering can only be performed by persons instructed to use the lift.
Please refer to the regulation „Lowering the vehicle“.
Every kind of external leakage must be removed. This is necessary particular before
emergency lowering.
In case of power failure the emergency lowering can only performed if the ratchets are not
engaged.
In case of defective valves the lift can be lifted a bit. So it is possible to pull back the ratchets
manually.
• Pull back the ratchets manually and lay a suitable support (wedge) between the ratchet strip
and the ratchet. Or fix the ratchet with the help of a wire. This step should be taken at all four
ratchets.
• Loose the lock nut (red nut).
• Control the dangerous places of the lift and be sure that there are no objects or people in the
immediate area of the lift or on the lift.
• Loose the emergency screw (set screw) one turn to start lowering.
• The emergency lowering starts. The lowering speed can be controlled with this emergency
lowering screw.
• Lower the lift in the lowest position.
• Observe the complete process.
• Retighten the emergency lowering screw and the lock nut.
picture:
emergency lowering screw at the side of the rail
1
lock nut
2
emergency lowering screw
After finishing the emergency lowering, close the emergency screw and fasten the lock
nut. Otherwise a malfunction of the lift can occur.
