Adjustment Of Feed Dog Height - Pfaff expression 2014 Service Manual

4. Feed dog height
Requirement:
In the highest position of the feed dog, the points of its teeth must protrude above the needle plate surfa-
ce by 0.85 - 0.9 mm. The tolerance must not remain under or exceed 0.85 to 0.9 mm (fig. 10).
Check:
Remove the needle.
Remove the presser foot.
Switch on the master switch.
Set stitch pattern "1" and stitch length "6.0".
Place adjustment gauge (63-114 690-23) on the needle plate so that feeler lever 30 rests on the
needle plate to the right of the cutout (fig. 11).
Turn the hexagon with a 6 mm spanner (wrench) slightly until pointer 31 is exactly at "0".
Move the gauge to the left to set feeler lever 30 on the feed dog (fig. 12).
Turn the handwheel until pointer 31 has moved up to its highest position. The pointer must now point
exactly at mark 0.9.
Adjustment:
Leave the adjustment gauge on the needle plate.
Remove baseplate and bobbin thread monitor, but leave all electrical connections in place.
Turn the handwheel until the feed dog is in its highest working position.
Loosen screw 32 by just 1/8 of a turn (fig. 13).
Turn eccentric stud 33 until the eccentric is facing the rear part of the housing (basic position).
Turn eccentric stud 33 counter-clockwise until pointer 31 is exactly at mark 0.9 (fig. 12).
Tighten screw 32 (fig. 13).
Cross-check:
Turn the handwheel until pointer 31 is in its highest position again.
The pointer must now be at mark 0.9. (fig. 12).
Lower the feed dog and check the function.
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