BA / ETL duolift MTE 3000 – 94 12 554
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10. Safety lock device (lifting nut failure)
Your lift is equipped with a safety lock that stops lift
operation once a lifting nut has failed. The function
of the safety lock is illustrated in Fig. 12 and Fig.
13.
Fig. 12 and Fig. 13 (top) show the position of the
lifting nut and the safety nut respectively, with the
angled safety catch between the two. The load car-
rying devices are housed in the lifting carriage, allo-
wing no access from outside.
In normal operation of the lift there is a clearance
between safety nut and carriage which allows the
safety nut to run at no load.
If the thread of the lifting nut is worn, the carriage
falls onto the safety nut and activates the safety lock
which presses against the rear side of the column
(see Fig. 13 bottom).
Under these conditions it is only possible to lower
the lift. If the carriage is moved upwards again, the
safety lock catches on the bar on the rear side of
the lift and stops upward travel.
The locking mechanism must not be disconnected
under any circumstances.
If the lift stops with the carriage about 10 cm above
the ground level, the safety lock has responded as
the load bearing elements are defective.
Once the safety lock has responded, the lift may
only be repaired by trained engineers. Repairs car-
ried out by non-trained personnel may lead to seri-
ous accidents!
To check the wear on the lifting nuts and take steps
to prevent their failure, open the plastic inspection
cover on the rear of the column and check the lifting
nut wear point (see Fig. 12).
If the wear is more than 1 mm, replace the lifting
nut!
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