Positioning the toothed belt wheels
30 Service Instructions 869-M PREMIUM - 00.0 - 07/2018
6.1 Positioning the upper toothed belt wheel
Fig. 17: Positioning the upper toothed belt wheel
Proper setting
The 2 threaded pins (2) for the upper toothed belt wheel (1) are seated
flush on the arm shaft (5).
The distance between the winder wheel (3) and the upper toothed belt
wheel (1) must be 0.8 mm.
The toothed belt (4) runs correctly without running against the retaining
ring or slipping off.
To position the upper toothed belt wheel:
1. Remove the arm cover ( p. 18).
2. Push the toothed belt (4) sufficiently far to the side so that the 2 threaded
pins (2) can be reached.
3. Loosen the threaded pins (2).
4. Turn the upper toothed belt wheel (1) so that the threaded pins(2) are
seated flush on the flat of the arm shaft (5).
5. Move the upper toothed belt wheel (1) to the side so that the distance
to the winder wheel (3) is 0.8 mm.
6. Tighten the threaded pins (2).
7. Push the toothed belt (4) back.
(1) - Upper toothed belt wheel
(2) - Threaded pins
(3) - Winder wheel
(4) - Toothed belt
(5) - Flat of arm shaft
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