Brother RH-9820 Service Manual page 72

6. ASSEMBLY
<Adjusting the pressure of the orthogonal shaft>
While pushing the pulley base(27) in the direction of the arrow with a force of 98 N, push the orthogonal shaft
(23) in the direction of the arrow with a force of 98 N, and then tighten the two set screws (28).
* This adjustment should be carried out immediately after applying adhesive to the orthogonal shaft (23) and to
the inside of the bearing (20) and (21).
C
Hypoid gear installation adjustment
1) Set the gear (25) to the position shown in the illustration, and then tighten the two set screws (29). Align the
set screw (29) at the front in the turning direction with the screw stop on the orthogonal shaft (23). (The arrow
shows the direction of rotation.)
2) Align the marks on the pinion (11) and the gear (25) as shown in the illustration. Next, align the set screw (30)
at the front of the pinion (11) in the turning direction with the screw stop on the upper shaft (7), and then
provisionally tighten the two set screws (30) so that the pinion (11) can still move in the axial direction. (The
arrow shows the direction of rotation.)
3) Push the pinion (11) against the gear (25) and adjust the backlash so that it is 0.05 mm or less, and then fully
tighten the two set screws (30).
<Adjusting the backlash>
Adjust the backlash so that it is zero at the point where it is at a minimum when the gear (25) is turned a full
rotation.
NOTE:
If the amount of backlash is too small, the rotation torque will increase and this will cause the gear (25) to
become worn. Furthermore, if the amount of backlash is too large, the operating noise will increase, so be
sure to adjust the backlash correctly.
63 RH-9820
0825B
0826B
0827B