Brother BC800, Service Manual

Page: 59 / 134

3 - 8
Main unit Main parts
9
Upper shaft assembly attachment
1. Pass timing belt 420-5GT-6 (timing belt)
2
and timing belt 372-2GT-6
(motor belt)
3
to the upper shaft assembly
1
.
2. Attach the needle bar crank
5
to the thread take-up lever crank
4
.
3. Set the upper shaft bushing
6
to the arm bed cover attachment position.
4. Attach the 2 upper shaft bearing pressers
78
with the 4 screws
1
.
*Key point
• Check that the bobbin base assembly is on the left side.
• Attach the left upper shaft bearing presser
7 so that the
projecting part of
7
is positioned at the upper right. And attach
the right upper shaft bearing presser 8 so that the projecting
part of
8
is positioned at the lower shaft.
5. Apply 1 or 2 drops of OILER to the matching section of the upper shaft
and the upper shaft bushing.
6. Align the D-cut face of the needle bar crank with the screw hole on the
thread take-up lever crank, and tighten the screw
2
.
Apply OILER to the matching section of the upper shaft
and the upper shaft bushing. 1 - 2 drops
XZ0206***
1
Torque
1.18 – 1.57 N
·
m
2
Torque
1.18 – 1.57 N
·
m
6 6
7 1 8
1
2 3
5 4
6
2
D cut face
D cut face
2
Giza Tite
5X16
Color; Gold
Set Screw, Socket (FT)
M5X5
Color; Black