Mechanical Checks; Column Motor Nut - Planmeca ProMax 3D Max with ProTouch Technical Manual

4 Preventive maintenance

4.4 Mechanical checks

4.4.1 Column motor nut

98 Planmeca ProMax 3D Max
The column motor is equipped with double motor nut assembly consisting of
lower, solid nut (primary), and upper, floating nut (secondary). In case the
primary nut fails, the secondary nut becomes active. The visual check of the
column motor nut assembly must be performed once a year as follows.
1. Switch the unit off.
2. Remove the two rear cover plates of the telescopic column as described
in section Parts replacement and repair > Removing and replacing
covers.
The column motor nut assembly is attached to the stationary column and
can be seen from the opening on the stationary column top.
3. Check, if the lug of the indicator sheet (2) is bent and the top surface of
the secondary motor nut is level with the edge of the column nut frame
(3), or a little higher (see the figure below).
1 Upper motor nut
2 Lug of the indicator sheet
3 Column nut frame
4. If the secondary nut is clearly inside the column nut frame (3) and the lug
of the indicator sheet (2) is straightened, the column motor nut assembly
must be replaced.
Technical manual