Timing Belt Tension - Brother XM3700 Service Manual

Adjustment
[Standard]
The belt slack should be 2.5 to 3 mm when pushing the center of the timing belt between
the upper shaft pulley and the tension pulley with a force of 1.96 N (200g).
[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 screw 1 of the tension pulley assy.
4. Move the tension pulley assy back and forth to adjust the tension of the timing belt.
5. Tighten the screw 1 of the tension pulley assy to secure the tension pulley assy to the arm bed.
1
XC2277001
Push-pull gauge
Tension pulley assy

Timing belt tension

Screw, Pan (S/P washer)
M4X8DB
Push-pull gauge (5N)
Timing belt tension
1.96 N (200g)
4 - 5
2.5 - 3 mm
Timing belt
1