Maintenance; Replacing The Blades - Pfaff hobbylock 4764 Operating Manual

Lower blade clamp screw
Align
Upper blade
1-1.5
Lower
blade
Needle
plate
Lower blade
Needle plate
Lowest position

4. Maintenance

4-1 Replacing the blades

The upper blade and lower blade are made of
a specially long-lasting steel and will seldom
have to be replaced. However, when they do
not cut the fabric, even though they are set in
the right position, replace them as follow:
Unplug the machine.
Open the front cover.
Replacing the lower blade:
1. Turn the moveable blade to the non-
operating position (see figure C, p. 10).
2. Loosen the lower blade clamp screw and
remove the lower blade.
3. Place a new lower blade in the groove of
the blade holder, align the cutting edge level
with the top surface of the needle plate and
tighten the clamp screw.
4. Return the moveable blade to its original
position.
Replacing the upper blade:
1. Set the upper blade to its lowest position by
turning the handwheel towards you.
2. Loosen the upper blade screw.
3. Place a new moveable blade in the groove
of the moveable blade holder.
4. Make sure that the cutting position of the
upper blade is positioned downwards 0.5 to
1.0 mm from the top of the cutting position
of the lower blade.
25