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24. 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. 67).
● Push lug 81 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 82 using a punch from the arm shaft.
● Remove spring washer 83.
● Loosen motor-mounting fastening screw 84 (fig. 68).
● Push the motor mounting up slightly.
● Remove the motor's flat toothed belt 85.
● Remove sprocket 86, bushing 87, torsion spring 88 and spring washer 89 (fig. 67).
Fitting the handwheel
● Push spring washer 89 onto the arm shaft.
● Insert torsion spring 88 into bushing 87.
● Attach bushing 87 together with torsion spring 88 onto the arm shaft.
● Press sprocket 86 onto the arm shaft.
● Push lockwasher 83 onto the arm shaft.
● Fit the motor's flat-toothed belt 85.
● 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).
● Tilt back the machine and place a rag underneath the arm shaft.
● Punch tapered notch pin 82, so that its sides have the same distance to the arm shaft.
● Push the handwheel onto the arm shaft, so that lug 81 locks in place above tapered notch pin 82
(fig. 67).
● Attach the stand cover, the housing insert as well as the top cover.
● Carry out an electrical safety test in accordance with VDE 0701 using testing appliance
Metrawatt 5013.
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