BROTHER LS-5000 (01) PDF Document

The symbols used in the service manual provide visual instructions for adjustments on your BROTHER LS-5000 sewing machine. Here is a table explaining their meanings:

To remove the covers on your BROTHER LS-5000 for service, follow these steps in order:

1. Remove the accessory table (A).

2. Loosen and remove the screw to remove the face plate (B).

3. Loosen and remove the screws to remove the front cover (C).

4. Loosen and remove the screws, lower the presser foot lifter, then remove the rear cover (D).

To ensure proper stitch formation on your BROTHER LS-5000, the clearance between the needle and shuttle hook point must be correctly set.

Standard:

The shuttle race should be positioned correctly with respect to its turning direction. The clearance between the needle and the shuttle hook point should be 0.02 to 0.1mm. The center of the needle should align with the center of the shuttle hook shaft.

Adjustment Procedure:

1. Set the pattern selection dial to 6.

2. Turn the balance wheel to set the needle and the shuttle hook to the correct timing position.

3. Turn the needle bar supporter stud slightly to either the right or left to adjust the clearance between the needle and the shuttle hook to the standard 0.02 to 0.1mm.

For smooth operation of your BROTHER LS-5000, the shuttle driver must be correctly adjusted in the raceway.

Standard:

The shuttle driver should rotate smoothly, and no play should be felt in the raceway.

Adjustment Procedure:

1. Loosen the setscrews of the driver shaft gear.

2. Adjust the clearance of the driver shaft.

3. Retighten the setscrews.

The needle swing, or parabola, on your BROTHER LS-5000 affects the quality of zigzag stitches.

Standard:

When the pattern selection dial is set to 4 (Zigzag):

– The needle swing should be 0.05 mm or less while the needle moves down from the needle plate to its lowest position.

– The needle swing should be 0.15 mm or less while the needle moves up from its lowest position to the needle plate.

These clearances should be observed on both sides of the needle plate hole.

Adjustment Procedure:

1. Set the pattern selection dial to 4 (Zigzag).

2. Loosen the three set screws on the worm gear.

3. Turn the worm gear to adjust the needle swing.

4. Tighten the three set screws on the worm gear.

Note: Ensure that the biting worm gear aligns with the pattern cam gear.

Proper needle centering is important for all stitches on your BROTHER LS-5000.

Standard:

When the pattern selection dial is set at 4 (Zigzag), the needle should move within a range of 5.0 to 5.4 mm across the needle plate. When the needle is lowered, it should not be too close to either the left or right edge of the needle plate hole.

Adjustment Procedure:

1. Set the pattern selection dial to 4.

2. Turn the balance wheel to lower the needle until it is just above the needle plate.

3. Loosen the locknut for the adjusting screw on the zigzag connecting rod.

4. Using a screwdriver, turn the screw to adjust the needle movement range with respect to the needle plate hole.

5. Tighten the locknut.

Adjusting the loop lift on your BROTHER LS-5000 is critical for the timing between the needle and the shuttle hook.

Standard:

When the pattern selection dial is set at 4 (Zigzag) and the needle is raised 1.7 to 2.1 mm from its lowest position on the left side, the shuttle hook point should align with the side of the needle.

Adjustment Procedure:

1. Set the pattern selection dial to 4 (Zigzag), then lower the needle to its lowest position at the left side of the needle plate.

2. Loosen the set screw on the drive connecting rod.

3. Raise the needle between 1.7 and 2.1 mm and align the shuttle hook point with the side of the needle.

4. Tighten the set screw.

Setting the correct needle bar height on your BROTHER LS-5000 ensures the hook properly catches the upper thread.

Standard:

When the pattern selection dial is set at 4 (Zigzag), and the needle is on the right side and contacts the shuttle hook, the clearance between the top of the needle eye and the shuttle hook point should be within 0.8 and 1.2 mm.

Adjustment Procedure:

1. Set the pattern selection dial to 4 (Zigzag), then lower the needle to its lowest position at the right side of the needle plate.

2. Turn the balance wheel until the needle contacts the shuttle hook.

3. Loosen the set screw on the needle bar.

4. Move the needle bar either up or down until the clearance between the top of the needle eye and the shuttle hook point is within 0.8 and 1.2 mm.

5. Tighten the set screw.

To ensure synchronized movement between the upper and lower shafts of your BROTHER LS-5000, the timing belt tension must be correct.

Standard:

The belt should slacken approximately 4 – 6mm under a 2N (200g) load.

Adjustment Procedure:

1. Depending on your machine’s voltage, loosen the setscrews on the motor holder (for 220/240V models) or loosen the nuts on the motor holder (for 120V models).

2. Move the motor to make the adjustment.

3. Retighten the setscrews and/or nuts.

The height of the feed dogs on your BROTHER LS-5000 determines how well the fabric is moved during sewing.

Standard:

The feed dog teeth should be 0.9 – 1.1mm above the needle plate at their highest position.

Adjustment Procedure:

1. Loosen the setscrew on the vertical feed arm.

2. Loosen the fixation screw of the eccentric nut.

3. Turn the eccentric nut to make the height adjustment.

4. Retighten the fixation screw of the eccentric nut.

5. Retighten the setscrew.

The presser bar height on your BROTHER LS-5000 determines the pressure applied to the fabric.

Standard:

The clearance between the presser foot and the needle plate should be between 6.0 and 6.5mm when the presser foot is raised.

Adjustment Procedure:

1. Raise the presser foot.

2. Loosen the screw on the presser bar guide bracket.

3. Adjust the height of the presser bar.

4. Tighten the screw.

Note: Check that the presser foot and feed dogs are aligned after adjustment.

To create balanced buttonholes on your BROTHER LS-5000, the left and right sides must have identical stitch density.

Standard:

When a buttonhole is sewn using the b, ac, and d settings on the pattern selection dial, the left backward stitching and right forward stitching should appear identical.

Adjustment Procedure:

1. Set the buttonhole adjustment dial to “0”.

2. Set the pattern selection dial to “b” and sew the left side of the buttonhole.

3. Loosen the screw on the reverse sewing regulator shaft.

4. Using a screwdriver, turn the reverse sewing regulator shaft to adjust the left backward stitching (b) until it feeds 35 to 45 stitches per 20 mm.

5. Tighten the screw.

6. Set the pattern selection dial to “d” and sew the right side of the buttonhole.

7. Loosen the fixation screw of the eccentric nut.

8. Use the nut to make adjustments so that the length of the right forward stitching is the same as the left backward stitching.

9. Tighten the screw.

To ensure both sides of the buttonhole are the same width on your BROTHER LS-5000, you may need to adjust the right forward stitching width.

Standard:

The width of the buttonhole’s right forward stitching should appear identical to that of the left backward stitching. The difference should be less than 0.2 mm.

Adjustment Procedure:

1. Install the darning plate onto the needle plate and lower the presser foot onto a piece of paper.

2. Set the pattern selection dial to “b”.

3. Turn the balance wheel until the needle contacts the paper.

4. Set the pattern selection dial to “d”.

5. Turn the balance wheel until the needle contacts the paper.

6. Using a screwdriver, turn the adjusting screw to change the stitch width of the right side.

Note: Turn the adjusting screw to the right to make the stitch width of the right side more narrow.

Adjusting the upper tension dial on your BROTHER LS-5000 ensures it provides the correct baseline tension.

Standard:

A thread tension amount between 0.05 and 0.1N (5 and 10g) should be measured at dial position 0. Cotton thread #50 should be used for this measurement, and take up spring torque should not be included.

Adjustment Procedure:

1. Remove the tension dial sheet and the stopring.

2. Remove the tension dial.

3. Turn the adjusting nut left or right to make the adjustment.

4. Remount the tension dial at the zero position, then replace the stopring and the tension dial sheet.

For best sewing results on your BROTHER LS-5000, the bobbin must be wound evenly and to the correct capacity.

Standard:

The bobbin should be wound evenly, up to 75 – 85% of the outer diameter of the bobbin.

Adjustment Procedure for Even Winding:

1. Loosen the set screw of the pretension slightly.

2. Shift the pretension up or down until even winding is achieved.

3. Retighten the set screw.

Adjustment Procedure for Amount of Thread:

4. Loosen the set screw of the bobbin presser.

5. Adjust the bobbin presser until the correct amount of thread is wound.

6. Retighten the set screw.

Setting the correct lower thread (bobbin) tension is essential for balanced stitches on your BROTHER LS-5000.

Standard:

The lower thread tension should be 0.3 – 0.35N (30 – 35g). To check the tension, pull cotton thread #50 from the bobbin case slowly with a tension gauge.

Adjustment Procedure:

1. Set cotton thread #50 in the bobbin case and pull it with a tension gauge.

2. Adjust the adjustment screw on the bobbin case to achieve a tension of 0.3 – 0.35N (30 – 35g).