60
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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