SINGER W173 - Manual (Page 20)

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If it should ever become necessary to replace the belt on your machine, the hand wheel
must first be loosened and moved out.
To do this, follow these instructions:
1 . Remove clutch nut (A) in center of wheel by taking out the small screw (B) near the
edge. Fig. 2T. Turn nut counter-clockwise until it can be lifted off.
2. Before moving the hand wheel, note the position of the washer, (C, Fig. 28), which fits
under the clutch nut. It may fall out when you are changing the belt.
3. Remove motor cover plate (6, Fig. 28) by loosing screws (E, Fig. 28).
4. Pull hand wheel away from the machine carefully. Fig. 29. Pull it just far enough to
make the grooved section which holds the belt accessible.
5. Slide old belt over hand wheel and over pulley on the end of motor.
S. Slide new belt into grooved section and over motor pulley.
7. Push hand wheel back against the machine.
8. If washer (C) has fallen off, replace so that the lips (D) are pointing toward the clutch
nut.
9. Replace nut and tighten screw securely.
10. Replace motor cover plate and tighten screws securely.
After doing this, turn the clutch toward you to disengage the sewing mechanism. If the
needle still moves up and down as you turn the hand wheel, again remove the clutch nut.
Give the washer a half turn and replace the nut.