Operating Instruction and Documentation
UNI-LIFT 4000
- 43 -
• Push override switch, located behind the lateral movable cover at the right side of the
operating unit (see. pic. 2)
• Push button ”Lowering” simultaneously. The lift will lower to lowest position with both
platforms.
• Release buttons and close cover.
• Push button ”Lifting”. In the lowest position of the lift the slave cylinder is filled with oil until it
is at the same level as the master cylinder. Now the lift is in normal function again and can
be used as described in this manual.
6. Troubleshooting
The terms master side and slave side or master cylinder and slave cylinder, respectively, that
are used in the following chapters and the wiring and hydraulic diagrams are explained as
follows: If the lift is installed as recommended in the foundation plan (command unit at the left
front side) the slave cylinder is placed under the rail that is near the command unit. The master
cylinder is found under the rail remote to the command unit. Master and slave cylinder are
different in the cylinder tube’ s exterior diameter (master cylinder ø 120 mm, slave cylinder ø
110 mm). For this reason there are distance elements with a width of 5 mm between the
cylinder and the square tube which the ratchets are welded to. These distance blocs are not
necessary at the master side as the diameter cylinder is larger
If the lift does not work properly, the reason for this might be quite simple. Please check the lift
for the potential reasons mentioned on the following pages. If the cause of trouble cannot be
found, please call the technical service.
Problem: Motor does not start
possible causes:
solution:
no power supply
main switch defective
main fuse defective
fuse in the operating unit defective
the fee line is cut
thermal switch in the motor is active
Motor defective
The top limit switch is active or the switch is
defective
The button „lifting” is defective
Examine the power supply
Examine the main switch
Examine the fuse
Examine the fuse
Make a repair
Let it cool down
Call your service partner
Examine the top-limit switch
Examine the press button
Problem: Motor starts, lift does not lifting!
possible causes:
solution:
The vehicle is to heavy
Level of the oil is too low
Pressure relief valve is defective
Leakage in the hydraulic system
Coupling between the motor and pump is defective
Gear pump defective
Unload the vehicle
Fill in if the lift is in the lowest
position
Call your service partner
Examine the hydraulic system
Call your service partner
Call your service partner
Problem: The lift does not lower!
possible causes:
solution:
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