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12. MOTOR BELT TENSION
If the motor belt tension is too tight or too loose, machine
will not run smoothly.
Adjust as follows:
1. Remove the front enclosure.
2. Loosen the 2 screws (a, b)
3. Move the motor up or downward and tentatively
tighten the screws.
Check the belt tension as follows:
• The belt does not touch to the casting or other parts.
• The belt must have flexibility of 5-6 mm when
average pressure is applied on its side.
4. When correct tension has been obtained, tighten the
bolts (a, b) securely.
13. TIMING BELT TENSION
If the timing belt tension is too tight or too loose, the
machine will run heavily or the timing of hook and feed
motion will be changed incorrectly.
Adjust as follows:
1. Remove the front enclosure.
2. Loosen the screw (a) tightening the tension pulley
bracket.
3. Push the tension pulley bracket so that the edge of
bracket should be 0-1 mm higher than the casting and
retighten the screw (a).
4. When you have adjusted the timing belt tension, re-
check the timing of the upper and lower shaft (Sec. 6)
and the timing of the hook (Sec. 3) again.
2
4
a
3
2
a
3
SERVICE MANUAL
b
5-6
mm
0-1 mm
26
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