Timing Belt Tension - Brother PE770 Service Manual

Adjustment
[Adjustment standard]
4 to 5mm slack by pushing the center of the belt with a force of 1.96N (200g).
[Adjustment procedure]
1. Remove the covers, the motor PCB and PCB holder.
2. Loosen the pan head screw (S/P washer, M4x10) of the tension pulley assembly.
3. Adjust the tension pulley assy. forward and back so that there should be 4 to 5mm slack in the timing belt when
the center of the belt is pressed with a force of 1.96N (200g).
4. Tighten the pan head screw (S/P washer, M4x10) of the tension pulley assembly. (tightening torque: 1.18 to
1.57N · m)
XC2277001
Pan head screw
(S/P washer, M4x10)
4 - 6

Timing belt tension

Push-pull gauge (3N)
4 - 5mm
Tension pulley assembly
1.96N (200g)