Brother RH-9820 Service Manual page 77

F
Needle bar crank forward/back adjustment
1) Align the screw stop of the needle bar crank
(11) with the side where the two set screws (12)
are on the upper shaft crank (h) (where the set
screw (12) (j) is), and then provisionally tighten
the two set screws (12) (i) and (j) so that the
needle bar crank (11) can still move back and
forth.
2) Pull out the crank rod unit (14) slightly.
3) Push the place indicated by
the Slide block (13) against slide block guide D
(9) so that the upper shaft crank (h) can still
turn easily, then tighten the set screw (12) (j)
through the hole in the side of the arm, and
then tighten the other set screw (12) (i)". After
this, turn the upper shaft crank (h) and
provisionally tighten the third set screw (12) on
the opposite side.
* After assembling, check that the upper shaft
crank (h) turns easily. If the slide block (13) is
pushed too firmly, the upper shaft torque will
become stiffer.
RH-9820
6. ASSEMBLY
to gently push
0838B
68