Positioning the toothed belt wheels
26 Service Instructions 878-M PREMIUM - 03.0 - 10/2019
The distance between the winder wheel (3) in the switched off state and
the upper toothed belt wheel (1) must be 0.8 mm.
The toothed belt (5) runs correctly without running against the retaining
ring or slipping off.
1. Remove the arm cover ( p. 16).
2. Loosen the threaded pins (4).
3. Turn the upper toothed belt wheel (1) so that the two threaded pins (4)
are set flush on the surface of the arm shaft (2).
4. Move the upper toothed belt wheel (1) to the side so that the distance
to the winder wheel (3) is 0.8 mm.
5. Tighten the threaded pins (4).
6.2 Positioning the lower toothed belt wheel
Fig. 15: Positioning the lower toothed belt wheel
Proper setting
The two threaded pins for the lower toothed belt wheel are set flush on the
surface of the lower shaft.
The toothed belt (1) runs correctly without running against the retaining
ring (2) or slipping off.
1. Tilt the machine head ( p. 15).
2. Loosen the threaded pins (4).
3. Turn the lower toothed belt wheel (3) such that the threaded pins (4)
are set on the surface of the arm shaft.
4. Move the lower toothed belt wheel (3) sufficiently far to the side so that
the toothed belt (1) makes contact with the retaining ring (2) without
being pushed away.
5. Tighten the threaded pins (4).
(1) - Toothed belt
(2) - Retaining ring
(3) - Lower toothed belt wheel
(4) - Threaded pins
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