Singer 9985 - Machine Control Functions; A. Start;Stop Button; B. Reverse Stitch Button; C. Needle Up-Down; Slow Button

SERVICE MANUAL
20
6. TIMING OF THE UPPER AND LOWER SHAFT
The upper and lower shaft must be positioned correctly
as follows.
1. Remove the front enclosure.
2. Turn the handwheel toward you until the needle is its
lowest point. At this time, the mark (a - very small
molded line on edge) on the lower shaft timing pulley
must be facing toward you.
If it is not so, adjust as follows:
2
a
3
b
4 5
7 8
3. Loosen the screw (b) tightening the tension pulley
bracket.
4. Slip out the timing belt from lower shaft timing pulley.
5. Turn the lower shaft timing pulley so that the mark
faces toward you.
6. Hook the timing belt on the pulley.
7. Push the tension pulley bracket so that the edge of
bracket should be 0-1 mm higher than the casting.
8. Retighten the screw (b)
9. Check the timing again and replace the front enclo-
sure.
10. When you have adjusted it, check the timing of the
hook again. (Sec. 3)
0-1 mm