Brother RH-9820 Service Manual page 71

1. Bearing
2. Bearing collar
3. Bearing
4. Upper shaft crank
5. Screw
6. Set screw
7. Upper shaft
8. Spacer
9. Bearing
10. Balance collar
A
The outer circumferences of the bearings touch the sewing machine arm and the orthogonal shaft (23)
touch the inside of the bearings, so avoid removing them if possible.
If removing them, apply adhesive (Threebond 1373B) to the outer circumferences of the bearings, and
apply adhesive (Threebond 1401) to the inside of the bearing on the orthogonal shaft (23). Be sure to
wipe away any excess adhesive from the bearings at this time to avoid letting the adhesive get inside
the mechanism.
B
Upper shaft and orthogonal shaft pressure adjustment
<Adjusting the pressure of the upper shaft>
1) While pushing the upper shaft crank (4) in the direction of the arrow with a force of 98 N, push the bearing
collar (2) in the direction of the arrow with a force of 98 N, and then tighten the two set screws (12).
2) While pushing the upper shaft crank (4) in the direction of the arrow with a force of 29.4 N, push the end
of the balance collar (10) against the upper shaft crank (4) with a force of 29.4 N, and then tighten the two
set screws (13).
3) While pushing the end of the bearing collar (15) in the direction of the arrow with a force of 29.4 N, tighten
the two set screws (17).
11. Pinion
12. Set screws [2 pcs]
13. Set screws [2 pcs]
14. Bearing
15. Bearing collar
16. Internal retaining ring
17. Set screws [2 pcs]
18. Timing pulley assembly
19. Set screws [2 pcs]
20. Bearing
21. Bearing
RH-9820
6. ASSEMBLY
22. Retaining ring C
23. Orthogonal shaft
24. Zigzag cam
25. Gear
26. Take-up cam roller
27. Pulley base
28. Set screws [2 pcs]
29. Set screws [2 pcs]
30. Set screws [2 pcs]
31. Set screws [2 pcs]
32. Set screws [2 pcs]
33. Pulley
34. Plain washers [3 pcs]
35. Screws [3 pcs]
0822B
0823B
0824B
62