Shuttle Hook Tension Adjustment - Singer 4423 Service Manual

3-18 Shuttle hook tension adjustment
- Remove the needle plate.
- Use a dial tension gauge (50g) (a) to take
measurement. (1)
- Put dial tension thread into shuttle hook
(b)(the same way as inserting the bobbin)
and pull it out, the standard range should be
10~14g. (1)
- Adjust the screw (c) of shuttle hook to
correct it if necessary. (2)
Turning clockwise makes dial tension
stronger; turning counter-clockwise makes it
weaker.
Re-check the standard tension range should
be 10~14g.
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