Changing The Toothed Belt - Pfaff Select 1520 Service Manual

46. Changing the toothed belt

Removal:
Disconnect the machine lead cord.
Remove needle and presser foot.
Remove detachable work support.
Remove top cover.
Switch on bobbin winder.
Remove the two Torx screws of the housing insert.
Remove the housing insert.
Remove the four retaining screws of the baseplate.
Place the baseplate aside.
Loosen screw 152 in arm shaft crank 153 (fig. 106).
Loosen screw 1 on tensioning roller 2.
Remove screw 154 on the upper toothed belt sprocket 155.
Remove the circlip 156 from the arm shaft.
Moving arm shaft 157 to the right, remove the toothed belt for the machine and the toothed belt for the
motor 59.
Loosen the three screws 94, 95 and 96 on the automatic utility-stitch unit.
Loosen the two screws 101 and remove small gear 97 to the right.
Move the automatic utility-stitch unit a little to the front and remove toothed belt 158 between the large
gear and the shaft end.
Refitting:
Insert the new toothed belt 158 for the machine between the large gear and the end of the shaft and
mount it on the lower belt sprocket 159.
Tighten the three screws 94, 95 and 96 on the automatic utility-stitch unit.
Pull toothed belt 158 upwards.
Slide arm shaft 157 to the left through toothed belt 158 into the left bearing and arm shaft crank 153.
Refit circlip 156 on the arm shaft.
Secure the arm shaft and insert screw 152 in the arm shaft crank.
Mount toothed belt 158 on the upper belt sprocket 155.
Insert screw 154 in the upper belt sprocket and firmly tighten.
Adjust tensioning roller in accordance with section 1.
Mount toothed belt 59 for the motor on the handwheel.
Refit small gear 97 on the shaft and gently tighten screws 101.
Adjust the gears in accordance with section 22.
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