Brother LK3-B438E Instruction Manual download pdf (Page 19)

LK3-B438E Mark II

Approx. 9-10mm

10N

V-belt

Motor

3-14 . Installing the V-belt

Approx.

1mm

Sewing

machine

1. Gently tilt back the machine head, and then place

the V-belt q into the V grooves on the machine

head pulley 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 po-

sition.

* Be careful not to clamp the cords at this time.

3. Provisionally install the accessory tension pulley

assembly r with the accessory flat washer, spring

washer and bolt.

4. Adjust the belt tension by moving the tension pul-

ley 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 ap-

proximately 10 N. After adjusting, tighten the bolt

A to secure the left pulley assembly.

5. Move the right tension 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 week, this will be cause of

following problems;

• Noise & vibration become large.

• Needle up stop position becomes unstable.

• Error message [E-50] is displayed.

Check that the motor is positioned so that the V-

belt is straight. (Fig.1)

3. INSTALLATION

Fig.1

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 61 62

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Brother LK3-B438E Instruction Manual Page 19

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