Dürkopp Adler D869 e-con Service Instructions Manual page 103

Sewing motor
6. Place the toothed belt (8).
Fig. 89: Assembling the sewing motor (5)
(9) - Tensioning roller
7. Fit the tensioning roller (9).
8. Use a wrench to tension the tensioning roller (9).
 It should not be possible to twist the toothed belt more than 45°.
9. Tighten the screw (10).
Service Instructions D869 e-con - 00.0 - 09/2023
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(10) - Screw
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