3. Installation

3-18. Installing the V-belt

Approx.

1 mm

Approx. 9 - 10 mm 10 N

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)

Sewing

machine

V-belt

Motor

Fig. 1

18

LK3-B448E MARKII/BA-16

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Image 25
Brother LK3-B448E instruction manual Installing the V-belt

LK3-B448E specifications

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