Pfaff expression 2014 Service Manual page 66

Adjusting the machine:
Tilt the machine towards the rear.
Disconnect spring 3 (fig. 80).
Unscrew and remove screw 4.
Turn the handwheel until the lobe of feed eccentric 5 is at the rear.
Fold feed regulator 6 downward and remove it with link 7 to the left from feed bar pin.
Check that the slide block can be moved easily without play or binding into the slotted lever.
If necessary, adjust according to section 2 a.
Fold feed regulator 6 to the rear and then upward over feed eccentric 5.
Insert screw 4 into clamping plate 21 and tighten just a little.
Push pin 20 to the side until lever 7 and driving bar 19 still have a little play and move easily.
Tighten screw 4.
Attach spring 3.
Loosen the three screws 29 in the lower flat-toothed belt sprocket 94.
Bring the needle bar to its lowest position by turning the handwheel.
Fit spacer (63-102 600-18) on the needle bar and push up against the needle bar frame.
Push needle rise clamp (61-111 600-35) on the needle bar.
Push 2 mm feeler gauge (00-870 136-01) with its cutout on the needle bar above the needle rise
clamp.
Loosen the needle rise clamp and push the 2 mm feeler gauge upward against the spacer.
Tighten the milled screw on the needle rise clamp.
Turn the handwheel back and forth.
If there is any play at the feeler gauge, repeat this procedure.
Remove the 2 mm feeler gauge.
Turn the handwheel in the normal direction until the needle rise clamp rests on the spacer.
Hold the handwheel at this position.
Turn hook driving shaft 28 in the normal direction until the pin gauge can be inserted in the hole of feed
eccentric 5 and pins 27 (fig. 80).
Insert the pin gauge and tighten one of the screws 29.
Remove the pin gauge, needle rise clamp and the spacer and tighten all three screws 29.
Note:
On having tightened the screws 29, there must not be any play between the lower flat-toothed belt
sprocket 92 and calotte 95.
Check section 4 "Adjustment of the feed dog height".
Carry out section 5 "Adjustment of the synchronizer".
Carry out section 12 "Sewing hook timing".
Insert the buttonhole sensor.
Attach the free-arm cover and fasten with both fastening screws 5.
Bring the feed-dog lowering mechanism to the normal working position.
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