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25. Changing the torsion spring in handwheel
Dismantling the handwheel
• Remove stand cover in accordance with the instructions for dismantling the housing.
• Turn the handwheel until the handwheel cutout is facing upward (fig. 58).
• Push lug 89 to the rear using a screwdriver.
• Pull off the handwheel from the arm shaft to the right.
• Tilt the machine to the rear.
• Place a rag underneath the arm shaft.
• Punch out tapered notch pin 90 using a punch from the arm shaft.
• Remove spring washer 91.
• Loosen motor-mounting fastening screw 92 (fig. 59).
• Push the motor mounting up slightly.
• Remove the motor’s flat toothed belt 93.
• Remove sprocket 94, bushing 95, torsion spring 96 and spring washer 97 (fig. 58).
Fitting the handwheel
• Push spring washer 97 onto the arm shaft.
• Insert torsion spring 96 into bushing 95.
• Attach bushing 95 together with torsion spring 96 onto the arm shaft.
• Press sprocket 94 onto the arm shaft.
• Push lockwasher 91 onto the arm shaft.
• Fit the motor’s flat-toothed belt 93 (fig. 59).
• Tighten the motor’s flat-toothed belt 93 in accordance with section 31, tightening fastening screw 92
• very securely at the same time.
• Tilt back the machine and place a rag underneath the arm shaft.
• Punch tapered notch pin 90, so that its sides have the same distance to the arm shaft (fig. 58).
• Push the handwheel onto the arm shaft, so that lug 89 locks in place above tapered notch pin 90.
• Attach the stand cover, the housing insert as well as the top cover.
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