Brother BAS-311G service manual Adjusting the tension release amount, ADJUSTMENT Y-GT belt

7.ADJUSTMENT <Y-GT belt>

Measurement position

5214Q

1.Move the X feed bracket (1) so that it is in the middle of the sewing area in the Y direction and at the left edge of the sewing area in the X direction.

2.Loosen the two bolts (3) of the Y-pulley bracket (2), and then provisionally tighten them at 19.6 mN·m.

3.Pass the M5x25 screw through the countersunk hole in the side of the bed and screw it into the tap hold in the Y-pulley bracket (2). Then adjust the belt tension to 160 – 240 N.

4.Tighten the two bolts (3), and then remove the M5x25 screw.

5.Measure the belt tension once more and check that it is 400 – 480 N.

*Be sure to use a belt tension gauge to measure the belt tension, and measure from the bottom of the belt.

*The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 30 mm and a span length of 370 mm.

*The recommended belt tension gauge to use is the Dr. TENSION TYPE-ll manufactured by MITSUBOSHI BELTING LTD.

7-18. Adjusting the tension release amount

5156Q 4689Q

1.Loosen the nut (4) and turn the bolt (2) to adjust so that the distance between the tip of the bolt (2) and the solenoid setting plate (3) is 16.5 mm when the plunger of the tension release solenoid (1) is pushed in as far as it will go.

2.Check that the tension disc opening amount is 1.0 - 1.5 mm when the tension release solenoid (1) is installed to the arm and the plunger is pushed with a screwdriver or similar tool through the hole in the solenoid cover.

*If memory switch No. 552 has been set so that the tension release timing is early, you can increase the trailing length for the upper thread.

102 BAS-311G, BAS-326G