Adjustment; Motor Belt Tension - Brother XM3700 Service Manual

Adjustment

120V specification
[Standard]
The belt slack should be 3.5 to 4.5 mm when pushing the center of the motor belt between
the T pulley of the upper shaft and the T pulley of the motor with a force of 0.98 N (100g).
[Adjustment]
1. Turn off the power, and then remove the foot controller.
2. Remove the face plate and the pattern selection dial, and remove the front cover and
the rear cover.
3. Loosen the 2 screws 1 of the motor holder.
4. Loosen the screw 2 of the motor supporter.
5. Move the motor holder up and down to adjust the tension of the motor belt.
6. Tighten the 2 screws 1 of the motor holder to secure the motor holder to the arm bed.
7. Tighten the screws 2 of the motor supporter to secure the motor holder to the arm bed.
1
XC2277001
2
Motor supporter

Motor belt tension

BOLT.
(S/P WASHER)
M5X12
Push-pull gauge (5N)
Motor belt tension
0.98 N (100g)
Push-pull gauge
4 - 6
2
Motor holder
<In case of 220 to 240V specification, refer to next page.>
Upset
4X12DB
3.5 - 4.5 mm
Motor belt
1