Adjustment Of Top Feed Height - Pfaff expression 2014 Service Manual

8. Adjustment of top feed height

Requirement:
In its highest working position the top feed foot must be 2 mm higher than the lower edge of the zigzag
foot sole (fig. 25).
Note:
This adjustment must only be carried out when the height of the presser bar is set correctly.
Check:
Raise the presser bar lifter.
Insert the zigzag foot sole.
Engage the top feed.
Turn the handwheel until the needle bar is in its lowest position.
Caution: The handwheel must now no longer be turned!
Lower the feed dog.
Fully raise the presser bar lifter and hold it in this position.
At the same time insert the presser foot gauge (63-114 690-39) from behind under the zigzag foot
and into the cutouts of the needle plate.
Lower the presser bar to its normal raised position.
Press the top feed lightly downward.
Check that the top feed foot rests only lightly on the presser foot gauge and has no play.
Adjustment:
Loosen screws 34 and 37 (fig. 25).
Push counter bearing 40 lightly downward until the top feed foot rests lightly on the presser foot gauge.
Tighten screw 34 in this position.
Cross-check:
Check for light resting and freedom of play of the top feed foot on the presser foot gauge as described
under "Check".
Adjusting the guide piece
Fully raise the presser bar lifter and hold it in this position.
Remove the presser foot gauge.
Lower the presser bar lifter to its raised position.
Turn the handwheel until needle bar 44 is in its top position.
Set guide piece 42 at a clearance of 0.2 mm from cross head 41 (fig. 24).
Tighten screw 37.
30