Pfaff EXPRESSION 2014, Руководство по обслуживанию, Страница: 62 / 112

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