Pfaff 1540 - Manual (Page 37)

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15. Replacing the zigzag-stitch unit on Pfaff 1520 - 1530
Removal:
z Disconnect the machine's mains plug.
z Remove the housing covers as described in this manual.
z Set stitch width adjustment dial 70 to "0" (fig. 26).
z Remove circlip 71 from connecting rod 72.
z Remove circlip 60.
z Remove connecting rod 65.
z Remove fastening screws 75.
z Carefully remove the zigzag unit from the machine.
Fitting:
z Insert bolt 76 of connecting rod 72 into joint piece 77 of the zigzag unit (fig. 26).
z Fit the zigzag unit in the machine inserting at the same time connecting rod 72 with sliding block 78
into the crank.
z Position the zigzag unit parallel to the arm shaft and gently tighten fastening screws 75.
z Refit circlip 71.
z Insert connecting rod 65.
z Refit circlip 60.