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b) Setting Tooth Backlash
Tooth backlash must be checked regularly and adjusted if required.
Ideally, the pinion is as close as possible to the main cogwheel without the teeth touching.
If the cogwheels (pinion and main cogwheel) are too far apart, the teeth of both cogwheels will be dam-
aged.
If the pinion presses against the main cogwheel (gear runs without play), performance is decreased,
power consumption is increased and the cogwheels will wear more quickly.
To set the tooth backlash, loosen the two fastening screws at
the electro motor (see arrows in the figure to the right) until you
can push the motor into the direction of the main cogwheel with
light pressure (only loosen screws slightly, do not remove them!).
The motor pinion and the main pinion now engage without clear-
ance.
Put a thin paper strip (no more than 80g paper) between the
motor pinion and the main pinion. Then manually turn the main
pinion so that the paper strip is pulled in between the two pin-
ions.
The pressure of the paper pushes back the electric motor by
the required measure. Now fasten the fastening screws of the
motor in this position.
If you then turn back the main cogwheel so that the paper strip
can be removed again, both cogwheels should have the correct
distance.
Never put any gear grease or oil onto the motor pinion and main cogwheel! Otherwise, dust, sand and dirt
deposits form on both cogwheels. This strongly increases wear or even causes the drive to lock!
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