Pfaff EXPRESSION 2014, Руководство по обслуживанию, Страница: 58 / 112

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24. Changing the torsion spring in handwheel
Dismantling the handwheel
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Remove stand cover in accordance with the instructions for dismantling the housing.
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Turn the handwheel until the handwheel cutout is facing upward (fig. 67).
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Push lug 81 to the rear using a screwdriver.
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Pull off the handwheel from the arm shaft to the right.
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Tilt the machine to the rear.
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Place a rag underneath the arm shaft.
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Punch out tapered notch pin 82 using a punch from the arm shaft.
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Remove spring washer 83.
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Loosen motor-mounting fastening screw 84 (fig. 68).
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Push the motor mounting up slightly.
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Remove the motor's flat toothed belt 85.
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Remove sprocket 86, bushing 87, torsion spring 88 and spring washer 89 (fig. 67).
Fitting the handwheel
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Push spring washer 89 onto the arm shaft.
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Insert torsion spring 88 into bushing 87.
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Attach bushing 87 together with torsion spring 88 onto the arm shaft.
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Press sprocket 86 onto the arm shaft.
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Push lockwasher 83 onto the arm shaft.
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Fit the motor's flat-toothed belt 85.
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Tighten the motor's flat-toothed belt 85 in accordance with section 31, tightening fastening screw 84
very securely at the same time (fig. 68).
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Tilt back the machine and place a rag underneath the arm shaft.
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Punch tapered notch pin 82, so that its sides have the same distance to the arm shaft.
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Push the handwheel onto the arm shaft, so that lug 81 locks in place above tapered notch pin 82
(fig. 67).
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Attach the stand cover, the housing insert as well as the top cover.
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Carry out an electrical safety test in accordance with VDE 0701 using testing appliance
Metrawatt 5013.