11
104 73 15-26
Settings
1. Belt tension - drive belt
Check
The fl at-toothed belt must be set so that the sewing hook has no play in its rotating direction, but it must
be possible to turn the machine easily.
1. Press lightly against middle of fl at-toothed belt.
2. The belt must move 3 to 4 mm.
Adjustment:
1. Remove the base plate
2. Loosen screws (A) and (B).
3. Re-position tensioning roller by push it up or down.
4. Tighten screws.
2. Motor Belt tension
Too tight or too loose motor belt tension can cause belt noise.
Too tight motor belt tension can make the machine to run slow and overload the motor.
Too loose motor belt tension may cause jumping of the belt teeth on the motor pulley.
Check
When pushing the motor belt with 200 grams load the defl ection of the motor belt should be 4~6 mm.
Adjustment
1. Remove the base cover, face cover, front cover and back cover.
2. Loosen the screws (c, d) of adjusting plate (b).
3. Move the motor
- up, the belt will become loosen;
- down, it will become more tighter.
4. Tighten the set screw (c).
5. Attach the back cover, front cover, Base covers and the face cover.
1
4~6m/m
a
2
b
d
c
1
3~4m/m
2
a
b
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