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e) Adjusting the backlash
The manufacturer has chosen an optimal setting for the backlash, therefore you should only change the
backlash if necessary.
The distance between the main gear (C) and the engine
pinion (D) should be as small as possible whilst ensuring
that the gears are not too tight. Follow the steps below to
adjust the setting.
• Remove the two screws (A) on the gearbox cover (B),
and then remove the gearbox cover.
• Loosen the two fixing screws (E) on the engine. Gently
slide the engine with the engine pinion (D) in the direc-
tion of the main gear (C).
• The engine pinion and the main gear should now inter-
lock with no clearance. However, this is detrimental to
the lifespan of the gears.
• Place a strip of thin paper between the engine pinion (D)
and the main gear (C). Turn the main gear so that the
paper strip (max. 80 g!) is pulled between the two gears.
• The pressure of the paper pushes the electric motor by
the required amount.
• Tighten the fixing screws (E) on the motor.
• When you turn the main gear in the other direction to
remove the strip of paper, both gears should be at the
necessary distance to one another.
Ideally, the engine pinion should be as close as possible to the main gear whilst ensuring that the cogs do
not touch, as this makes the gears too tight.
If the gears (engine pinion and main gear) are too far apart, the cogs on the main gear will be damaged by
the engine pinion after just a few seconds, which will void the warranty/guarantee!
However, if the engine pinion presses against the main gear (i.e. there is no clearance between the cogs),
this will decrease performance, increase power consumption (the motor requires lots of power to turn the
main gear) and lead to premature wear.
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