15mm (9.8N)
3. Installing the belt
Tension
adjust nuts
Belt
1) The belt distance, between sewing machine pul-
ley and motor pulley, must be parallel.
2) The belt tension should be adjusted by turning
the tension adjust nuts to change height of the
motor, so that the belt sinks down by about 15
mm (9.8N) when it is depressed by band at the
center of the belt span.
If the belt tension is not tight, speed is unstable
at low-speed or medium-speed operation, and
the needle will not stop exactly in position.
4. Adjusting the pulley cover
1) After adjusting the belt tension, adjust the pulley
cover
1
so that the clearances between the belt
and the pulley cover
1
,
a
and
b
should be the
same.
2) After the completion of adjustment, tighten
screws
2
located on the side of pulley cover
1
and securely x the pulley cover
1
so that it
does not slip out of position.
a
b
1
1
2
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