Maintenance; Machine Maintenance; Cleaning; Cleaning The Touch Screen - Pfaff coverlock 4.0 Owner's Manual

Machine maintenance

An overlock machine requires more frequent maintenance
than a conventional machine mainly for two reasons:
• A lot of lint is produced when the cutters are cutting
the the fabric.
• An overlock runs at a very high speed and needs to be
oiled frequently to lubricate the internal working parts.

Cleaning

Turn off the main power switch and unplug the machine.
• Open the front cover and remove all the lint using the
lint brush.
• Close the front cover and wipe the exterior surface of
your machine with a soft cloth to remove any dust or
lint built up.

Cleaning the touch screen

Wipe the touch screen with a clean, soft and damp cloth.

Oiling

Turn off the main power switch and unplug the machine.
To keep the machine running smoothly and quietly
the moving parts, pointed out on the picture, must be
lubricated often.
Use supplied sewing machine oil. Do not use any other
oil, it could damage the machine.
Wipe the machine surface to remove all excess oil before
sewing.

Replacing the movable upper cutter

Turn off the main power switch and unplug the machine.
The movable upper cutter should be changed when it
becomes dull. The upper cutter can be replaced according
to the following directions. If you are having any
dif culties, consult your authorized PFAFF® dealer.
• Open the front cover and set the movable upper cutter
(1) in A position (See page 10).
• Loosen the set screw (2) and remove the upper cutter
(1).
• Turn the handwheel until the upper cutter holder is in
its lowest position.
• Place a new upper cutter in the groove of the upper
cutter holder and tighten the set screw (2).
• Make sure the front edge of the movable upper cutter
is 0.5-1.0 mm lower than the cutting edge of the
stationary cutter (3).
3
1
2

Maintenance

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