Brother NV4000D Service Manual page 141

Main unit
1
Lower shaft A assembly attachment
1. Rotate the pulley (upper shaft) 1 until the base line 2 of the pulley comes
to the top.
2. Apply 1 or 2 drops of Turbine Oil #100 to the lower shaft bushing
attachment sections 3 (2 locations), and then move the lower shaft
bushing 4 to the lubricated section.
3. Hang the timing belt 5 over the timing pulley D 6 of the lower shaft A
assembly.
4. Set the lower shaft bushing 4 to the arm bed's lower shaft bushing
attachment sections (2 locations).
5. Place the bushing pressers 7 on the lower shaft bushings 4 (one each at 2
locations).
6. Secure the bushing pressers 7 with the screw 1 (2 locations).
*Key point
• Before tightening the screw 1, check that the slit on the joint
8 is vertical and the screw hole 9 faces the front.
Apply Turbine Oil #100 to the lower shaft's lower shaft
bushing attachment sections (2 locations)
NOTE
Check the lower shaft rotation torque.
If the rotation torque is heavy, perform the following adjustment.
• Drop a brass bar of approx. 1 kg from a height of 50 mm onto
the oil hole on the bushing presser.
• Tighten the screw, and apply 1 or 2 drops of Turbine Oil #100
to the oil hole on the bushing presser.
Start movie clip (CD-ROM version only)
1
Rotary hook driving unit, feed/rotary hook unit, thread
cutter unit, side feed unit
Taptite, Bind S
M4X10
1.47 – 1.96 N
Color; Gold
1 - 2 drops
1
Torque
·
m
2
1
3
4 5
7 6 5
1
8
9
3 - 9