Replacing The Zigzag-Stitch Unit On Pfaff 1540 - Pfaff Select 1520 Service Manual

23. Replacing the zigzag-stitch unit on Pfaff 1540

Removal:
Disconnect the machine's mains plug.
Remove the housing covers as described in this manual.
Set stitch width adjustment dial 70 to "0" (fig. 44).
Remove circlip 71 from connecting rod 72.
Remove circlip 92 (fig. 46).
Detach pull rod 93 and remove it from the top.
Remove the two circlips 99 (fig. 45).
Remove plastic angle lever 100 from the front.
Loosen fastening screws 75 (fig. 45).
Carefully remove the zigzag-stitch unit from the machine.
Fitting:
Insert bolt 76 of connecting rod 72 into joint piece 77 on the zigzag-stitch unit (fig. 44).
Fit the zigzag-stitch unit in the machine inserting at the same time connecting rod 72 with sliding block
78 into the crank.
Position the zigzag-stitch unit parallel to the arm shaft and gently tighten fastening screws 75.
Replace circlip 71.
Insert plastic angle lever 100 together with pull rod 93 (fig. 45).
Refit the two circlips 99.
Re-attach pull rod 93 and refit circlip 92 (fig. 46).
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