Motor Belt Tension - Singer 4423 Service Manual

3-19 Motor belt tension
- Remove the back cover, front cover and
test tension of motor belt using belt tension
gauge (a). Its standard measurement should
be 100g. (1)
- Adjusting the belt adjusting plate (b) to
regulate the improper belt's tension. The
way to adjust is as following:
Loosen the screws (c, d) of adjusting plate
(b), and then move it to up, the belt will
become loosen; move it to down, it will
become more tighter. (2)
Tighten the screws (c, d) after confirming
the proper belt tension.
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