Tecline
UM-17
To replace one or more rack segments it is necessary to
remove the axis from its vertical position and put it in horizon-
tal position. After this, secure it firmly and proceed as follows:
a.
Remove the motor and the reduction gear but leave the
shaft and pinion fitted for the subsequent adjustment (refer
to section “Removal and replacement of the drive shaft”).
b.
Move the carriage into a position that does not interfere
with the segment of rack to be replaced.
c.
Remove plugs (A) using the correct removal tool.
d.
Undo socket head cap screws (B).
e.
Remove the rack segment concerned (C)
f.
Check the positioning of the rack beads (D) and the M8
securing plugs inserted in the profile slot, and carefully
arrange the new segment of rack without working
on the grub screws mounted on the support beads (D)
g.
Tighten screws (B) in the respective threaded plugs without
blocking them, to allow the subsequent adjustment
of the rack.
h.
Insert plugs (A) in their housings, making sure they are
Removal and replacement of the rack
flush with the upper level of the rack. If one or more plugs
get damaged during the removal, they must be replaced
with equivalent plugs.
i.
By moving the carriage slowly, manually check that the
pinion/rack clearance and the pitch on the joint of the
replaced segment are the same as the area in which
nothing has been worked on (for a starting reference do
more tests along the said section). If the clearance is
greater the rack needs to be brought closer to the pinion,
where the clearance is lower the rack needs to be moved
further away from the pinion. Once the clearance has
been properly adjusted, proceed with the final tightening
of the screws, at the end of which a new clearance check
is recommended.
If the clearance between the teeth is more than antic-
ipated, it will result in noisy and inaccurate movement
(especially for changes of direction). If the clearance
is lower, there will be abnormal consumption of the
teeth which would result in damage to the system. If
the pitch between the rack segments is incorrect, it
could cause serious damage to the teething.
j.
Proceed with greasing the replaced segment. If the rack
segments to be replaced total more than one, you must
replace one segment at a time, to avoid losing the initial
references.
k. Perform the operation in reverse for refitting.
