Assembly/Attachment Of Lower Shaft Assy - Brother XM3700 Service Manual

Application of Assembly

1-3 Assembly/Attachment of Lower shaft assy

1. Set the set screw collar 1, the washer thrust 2, the lower shaft bushing 3
and the washer thrust 4 to the lower shaft assy 5, and then attach the
retaining ring E6 6.
2. Tighten the 2 screws 1 while pushing the set screw collar 1 to the
direction of the arrow 7.
*Key point
• Check that it is not a wobble, and it moves smoothly.
3. Set the timing pulley D 8 to the lower shaft assy 5, and slide it to the
direction of the arrow 9, and then tighten the 2 screws 2 temporarily.
*Key point
• Set the groove 0 of the timing pulley D 8 facing frontward so
that the larger end of the feed cam A facing backward in the
state that the positioning hole B with the vertical.
• Fully tighten the 2 screws 2 after performing
Adjustment: Needle bar
4. Set the lower shaft bushing C to the lower shaft assy 5, and then attach
the retaining ring E6 D.
5. Set the lower shaft assy 5 to the bottom side of the feed holder E.
*Key point
• Check that the lower shaft bushing C is set the positioning
part of the back side of the feed holder E.
• When attaching the lower shaft assy 5, set the outer rotary
hook F with the mark G facing frontward, and set the lower
shaft assy 5 so that the larger end of the feed cam A facing
backward in the state that the positioning hole B with the
vertical.
6. Set the bushing presser H to the back side of the feed holder E, and then
secure it with the 2 screws 3.
Apply FBK OIL RO 100 to the left and right end of
the lower shaft bushing 3.
Apply FBK OIL RO 100 to the left and right end of
the lower shaft bushing C.
1
2
3
Feed unit
"4-19
rising".
Set Screw, Socket (FT)
M4X4
Set Screw, Socket (CP)
M5X5
Screw, Bind
M4X8
3 - 67
1
5
C
D
5 1
7
G
2 drops
2 drops
3
D
8
6
3
0
2
2
4
2
A
1
B
2 3 4 6 8
0 9
1 2
F A
Rear
C E 5
H 3