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LK3-B448E MARKII/BA-16
3. Installation
18
3-18. Installing the V-belt
1. Gently tilt back the machine head, and then place the
V-belt q into the V grooves on the machine head pul-
ley w and the motor pulley e.
NOTE:
After tilting back the machine head, do not push
the face plate side or the pulley side from above.
2. Gently return the machine head to its original position.
* Be careful not to clamp the cords at this time.
3. Provisionally install the assessory tension pulley
assembly r with the assessory flat washer, spring
washer and bolt.
4. Adjust the belt tension by moving the tension pulley
assembly to the right and left so that there is 9-10 mm
of deflection in the V-belt q when it is gently pushed in
the middle with a force of approximately 10 N. After
adjusting, tighten the bolt A to secure the left
pulley assembly.
5. Move the right tesion pulley so that there is a gap of
about 1 mm between it and the V-belt q, and then
tighten the bolt B to secure the right pulley assembly.
NOTE:
Use brother specified V-belt (belt, VM).
The V-belt q may stretch slightly when it is first used,
so adjust the belt tension after about 3,000 cycles of
use.
When above belt tension is weak, this will be cause
of following problems;
•
Noise and vibration become large.
•
Needle up stop position becomes unstable.
•
Error message [E-5] is displayed.
Check that the motor is positioned so that the V-belt
is straight. (Fig.1)
Approx. 9 - 10 mm
10 N
Approx.
1 mm
Sewing
machine
V-belt
Motor
Fig. 1