Brother RH-9820 Service Manual page 98

6. ASSEMBLY
C
Lower shaft provisional installation position
* This position is the provisional position for the lower shaft until the procedure in "7-5. Adjusting the looper
stroke" is carried out.
89
Should be no clearance.
RH-9820
1) Turn the upper shaft pulley (d) to the needle up
stop position.
(Align the pulley groove (E) with the arm
reference line (D).)
2) Align the index mark (I) of the lower shaft cam
(28) with the hole (H) in the bed.
3) Push the lower shaft cam (28) against the end
of the bearing collar (2), and then provisionally
tighten the two set screws (29).
0941B
0942B
0943B