Pfaff coverlock 4852 Owner's Manual page 63

Changing the upper blade
Switch off the electrical power
To remove: Set the adjusting knob for seam
width to 3.5 mm. Fasten the upper blade
(see page 39) before loosening the fastening
screw (A) with the wrench provided in the
accessory box. Then remove the upper
blade.
To insert: Attach the new upper blade and
gently tighten the fastening screw. Then turn
the handwheel until the upper blade is in the
lowest position.
In this position the front edge of the upper
blade must be 0.5 to 1.0 mm lower than the
cutting edge of the lower blade. When the
upper blade has been properly inserted you
can fully tighten the fastening screw. Loosen
the screw to the movable upper blade.
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