Attachment Of Upper Shaft Assy - Brother XM3700 Service Manual

Basic of Assembly
3

Attachment of Upper shaft assy

1. Pass the timing belt 1 to the upper shaft assy 2.
2. Set the thread take-up counter weight 3 to the needle bar crank rod assy
4.
3. Set the lower shaft bushing 5 and the lower shaft bushing 6 to the 2
positioning parts of the arm bed.
4. Align the D cut face 7 of the needle bar crank rod assy 4 with the screw
hole on the thread take-up counter weight 3, and then tighten the screw
1.
5. Set the 2 bushing pressers 8 to the arm bed, and then secure them with the
2 screws 2.
Apply FBK OIL RO 100 to the matching section of
the upper shaft and the lower shaft bushing 5.
Apply FBK OIL RO 100 to the left and right end of
the lower shaft bushing 6.
Apply FBK OIL RO 100 to the sliding surface of
the needle bar crank rod assy 4 and the thread
take-up counter weight 3.
→
Refer to 3 - 50 of the Assembly.
1
2
Upper shaft, Needle bar and Presser foot unit
Set Screw, Socket (FT)
M5X5
Hex wrench 2.5mm
Taptite, Bind S
M4X10
2 - 30
2 drops
6
2 drops
2 drops
2
8
2
5 1
4 7 1 6
3
4
1
3
2 8
2