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46. Changing the toothed belt

Removal:

z Disconnect the machine lead cord.

z Remove needle and presser foot.

z Remove detachable work support.

z Remove top cover.

z Switch on bobbin winder.

z Remove the two Torx screws of the housing insert.

z Remove the housing insert.

z Remove the four retaining screws of the baseplate.

z Place the baseplate aside.

z Loosen screw 152 in arm shaft crank 153 (fig. 106).

z Loosen screw 1 on tensioning roller 2.

z Remove screw 154 on the upper toothed belt sprocket 155.

z Remove the circlip 156 from the arm shaft.

z Moving arm shaft 157 to the right, remove the toothed belt for the machine and the toothed belt for the

motor 59.

z Loosen the three screws 94, 95 and 96 on the automatic utility-stitch unit.

z Loosen the two screws 101 and remove small gear 97 to the right.

z 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:

z 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.

z Tighten the three screws 94, 95 and 96 on the automatic utility-stitch unit.

z Pull toothed belt 158 upwards.

z Slide arm shaft 157 to the left through toothed belt 158 into the left bearing and arm shaft crank 153.

z Refit circlip 156 on the arm shaft.

z Secure the arm shaft and insert screw 152 in the arm shaft crank.

z Mount toothed belt 158 on the upper belt sprocket 155.

z Insert screw 154 in the upper belt sprocket and firmly tighten.

z Adjust tensioning roller in accordance with section 1.

z Mount toothed belt 59 for the motor on the handwheel.

z Refit small gear 97 on the shaft and gently tighten screws 101.

z Adjust the gears in accordance with section 22.

Pfaff select 1520 Service Manual

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