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c) Setting of the Tooth Backlash
The distance between the main gear (C) and motor pinion (D) must be as low as possible without the gears being too
tight. How to achieve this?
• Turn the three screws (A) of the gear cover (B) out; take
off the gear cover.
• Loosen the two motor attachment screws (E) slightly.
Then push the motor with the motor pinion (D) in the
direction of the main gear (C) 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 between the motor pinion (D) and
the main gear (C). Then manually turn the main gear
so that the paper strip (max. 80 g paper!) is pulled in
between the two gears.
The pressure of the paper pushes back the electric mo-
tor by the required measure.
• Now tighten the motor's attachment screws (E) 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 (gears 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.
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