Specifications

3. Loosen the large socket
head screw in the locking
collar for the Top Bobbin
Drive Pulley (see Figure
4-16) and rotate the belt
and pulley slightly until the
movable knife just
contacts the select
position fixture (see Figure
4-15).
4. Stop rotating and hold the
belt and pulley in place
while you tighten the large
socket head screw in
locking collar to
45 inch
lbs (6.22 km) of torque.
5. Remove the select position
fixture.
6. Press the key to rotate the head to the head up position.
7. Perform the select position checking procedure again, to check that the movable
knife now just contacts the select position fixture in the needle plate hole
between 311 and 313 degrees.
8. Insure all areas loosened to adjust for select position are properly retightened
before continuing.
9. Refer to the peripheral operation manual for the procedure to reset hook timing.
locking
collar
screw
Top Bobbin
Drive Pulley
belt
locking
collar
TOP, REAR of Head
Z drive
pulley/belt
Figure 4 - 16
Select Position Adjustment 4 - 23
110291-01, Rev D 4. Trimmer Maintenance