39
Then turn out the 6 holding screws for the sprocket cover.
Remember the corresponding position of the screws.
Take off the sprocket cover; then the entire rear axle unit
can be taken out
Insert the motor into the motor holding plate and screw it
on slightly (do not tighten the screws yet, since the motor
pinion still needs to be installed and aligned!). The screws
must not be too long, or the motor would be impaired in
its function.
Push or plug the cooling element (A) onto the motor.
Push the enclosed motor pinion (B) onto the axle of the
electromotor and screw it on slightly with the enclosed
grub screw (C) (do not tighten the grub screw yet).
To prevent the motor pinion from coming loose
in operation, always put a drop of threadlocker
varnish onto the grub screw thread.
Insert the rear axle unit as a test. Observe that the motor
pinion is running precisely on the main gear and is not
offset to the side. Now turn the grub screw into the motor
pinion.
Then set the tooth backlash properly. The distance between the motor pinion and main gear must be as low as pos-
sible without the gears being too tight. How to achieve this?
Loosen the two attachment screws of the motor a little bit so that it can be moved in the motor holding plate but does
not wobble. Push the motor with the motor pinion in the direction of the main gear with light pressure.
The motor pinion and the main gear now engage without clearance. However, this is not perfect for the service life
of the gears!
Put a thin paper strip (no more than 80 g paper!) between the motor pinion and the main gear. Then manually turn
the main gear so that the paper strip is pulled in between the two gears. The pressure of the paper pushes back the
electric motor by the required measure.
Now tighten the motor's attachment screws again in this position. If you then turn back the main gear so that the paper
strip can be removed again, both gears should have the correct distance.
Ideally, the motor pinion should be as close as possible to the main gear without the teeth touching and the
gears therefore being tight.
If the gears (motor pinion and main gear) are too far apart, the main gear teeth will be virtually shaved off by
the motor pinion after a few seconds - this will void the warranty/guarantee!
If the motor pinion presses against the main gear (teeth are running without play), this will decrease perfor
-
mance, increase power consumption (the motor already requires lots of power to turn the main gear) and
lead to premature wear.
After the motor pinion has been properly installed and the tooth backlash set, the rear axle unit must be screwed on
again.
Ensure that the cardanic shaft is pushed into the rear axle unit's tappet.
Attach the rear axle unit with the 8 recessed-head screws from the bottom of the chassis. Reinsert the sprocket cover
and reattach it with the screws removed in the beginning.
A
B
C
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