Changing The Flat-Toothed Belt - Pfaff expression 2014 Service Manual

27. Changing the flat-toothed belt

Removal:
Remove the housing in accordance with the adjustment and repair instructions.
Turn the handwheel until the lobe of feed eccentric 5 is positioned at the rear.
Loosen fastening screw 1 of tensioning roller 2 (fig. 75).
Tilt the machine to the rear.
Unscrew and remove fastening screw 90 of clamping plate 91 on the lower right calotte bearing
(fig. 76).
Remove the clamping plate.
Slip off flat-toothed belt 98 from the upper and lower belt wheels 93 and 94.
Lift complete hook driving shaft 28 out of the lower right calotte bearing 92 as far as it will go.
Pull the flat toothed belt between calotte 95 and calotte bearing 92.
Disconnect tension spring 96 on needle bar frame 44 (fig. 75).
Remove lockwasher 51 on the needle bar frame.
Remove circlip 97 on zigzag stepping motor 46.
Dismantle the complete connecting rod 99.
Loosen screw 100 on needle bar crank 101 (fig. 75).
Unscrew and remove both clamping plate screws 102.
Dismantle both clamping plates 103.
Lift the needle bar with the crank as far out as possible from calotte bearings 104 and 105.
Hold the needle bar crank firmly. At the same time move needle bar 106 to the right until both parts
are disengaged.
Dismantle the complete needle bar.
Remove the flat-toothed belt from the housing to the top.
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