Brother RH-9820 Service Manual page 136

6. ASSEMBLY
6-22. Upper cover mechanism (upper thread tension release and upper
thread take-up mechanisms and upper thread path)
* Refer to the detailed descriptions on the next page for details on A to C in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by
Refer to "7-31.
Adjusting the
upper thread
loosening
amount".
127
.
B
A
RH-9820
C
0857B
After installing the
Socket bolt (16),
tighten the two screws
(4) so that the cylinder
moves smoothly.