Pfaff expression 2014 Service Manual page 70

Fitting:
Insert the new hook driving shaft with bevel gear 56 in the sewing hook bearing (fig. 82).
Mount sewing hook 52 with the plastic disk on the sewing hook bearing and set it.
Fasten the sewing hook bearing using both screws 111 (fig. 83).
Note that the sewing hook bearing is fastened parallel to the housing.
Push the hook driving shaft to the left until circlip 112 rests against the lower right calotte bearing 92.
Place the hole of lifting eccentric 109 above the surface of hook driving shaft 28.
Swivel in screw 57 of lifting eccentric 109 and fasten slightly.
Press lower flat-toothed belt socket 94 to the right against calotte bearing 92.
At the same time tighten one of screws 29.
Check that the hook driving shaft has zero play and moves free of binding.
Tighten all three screws 29 of the lower flat-toothed belt socket.
Slightly loosen screw 57. Push the bevel gear and lifting eccentric 109 to the left until it rests on bevel
gear 56 without any play.
Tighten screw 57 on the surface of hook driving shaft 28 (fig. 83).
Screw in dog-point screw 108 into feed eccentric 5 or the hook driving shaft.
Note:
Dog-point screw 108 must always protrude from feed eccentric 5 on the opposite side of screw 57 in
lifting eccentric 109.
Insert cylindrical pin 12 and fasten with the clamping plate.
Adjust the feed driving shaft according to section 2a.
Fit pin 23 with the washer situated to the left of the pull rod without any play.
Tighten screw 22.
Pull the feed dog to the front.
Important:
The complete feed driving shaft with top feed must slide slowly to the rear.
Fit slide block 8 with the spring on the pin and insert into slide was in the correct curve radius.
Check that the slide block can be moved easily without play or binding in the slide way.
Push link 7 complete with feed regulator 6 to the right onto the connecting bar pin.
Turn feed regulator 6 to the rear and then over feed eccentric 5 from the top.
Insert screw 4 with clamping plate 21 and tighten slightly.
Shift stud 20 laterally until link 7 and connecting bar 19 only have a slight play and are freely movable.
Tighten screw 4.
Fit spring 3.
Fit the feed dog lowering mechanism.
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