Brother TZ1 B651 Guide

Industrial Sewing Machine Repairs

MADE EASYWith QWIK-Fix Teach Yourself Guides and Manuals

Brother TZ1 B651

QFBBR TZ1B651

Artizan 196 High Road Wood Green London ENGLAND N22 8HH

www.seweazi.com

BASIC REPAIRS &

ADJUSTMENTS

At no time does QWIK-Fix-Publications or its licensees permit the copying in any format written or electronic

of any of the data provided in any of their publications

QWIK-Fix-Publications™ READ FIRST

IMPORTANT NOTICE:

PLEASE NOTE:

If it is felt that carrying out any of the instructions listed in this manual

or CD are not within the capabilities of the person about to attempt the

adjustments you must seek the assistance of a qualified engineer.

QWIK-Fix-Publications DO NOT guarantee that the enclosed instructions

will solve any or all of the readers sewing machine breakdown problems

but advise that the information is a general guide to problem solving and

general adjustments only.

Qwik-Fix-Publications™

Brother TZ1 B651

BASIC REPAIRS & ADJUSTMENTS

CONTENTS SECTION

Repairs and Adjustments

Bobbin Base Replacement 1:1

Bobbin Base Retainer 1:3

Check Spring Adjustment 2:1

Check Spring Replacement 2:2

Feed Setting 3:1

Hook Timing 5:1

Hook lateral adjustment 5:2

Needle bar Settings 6:2

Needle Insertion 6:4

Needle Types/Sizes 6:5

Needles Using The Correct Type and Size 6:6

Needle Design 6:7

Stitch Formation 12:1

Tension (Lower) 13:2

Tension (Upper) 13:3

Thread Types/Sizes 14:1

Threading 14:3

Parts Description

Inner Machine UPPER 20:5

Inner Machine LOWER 20:6

QFBBR TZ1B651

TROUBLE SHOOTING FOR LOCKSTITCH SEWING MACHINES

BOBBIN AND BOBBIN CASE PROBLEMS Section

Bobbin case falls out 17:6

Bobbin case doesn’t fit in bobbin base 17:6

Bobbins don’t fit in bobbin case 17:6

BOBBIN WINDER PROBLEMS

Bobbin winder doesn’t drive 17:6

Bobbin winder thread uneven 17:6

Bobbin winder thread loose1 17:6

Bobbin winder thread tight1 17:6

Bobbins don’t fit winder 17:6

CHECK SPRING PROBLEMS

Check spring breaks easily 17:6

Check spring jams 17:6

FEED DOG PROBLEMS

Feed dog hits needle plate 17:7

Feed dog out of alignment 17:7

HOOK PROBLEMS

Hook jams 17:7

Hook area noisy 17:7

Hook timing keeps going out 17:7

Machine jams 17:7

NEEDLE PROBLEMS

Needle plate centre bends 17:7

Needles bend 17:7

Needles break 17:7

Needles fall out of needle bar 17:7

NEEDLE BAR PROBLEMS

Needle bar jams or seizes 17:7

PRESSER FOOT PROBLEMS

Presser foot jams up 17:8

Presser foot doesn’t lift high enough 17:8

Presser foot lifts too high 17:8

Presser foot doesn’t hold materials 17:8

STITCH FAULTS

Miss stitching 17:8

Stitch uneven 17:8

STITCH LENGTH PROBLEMS

Reverse stitch is too small 17:8

Stitches too small 17:8

Stitches too large 17:8

Stitches vary in size 17:8

THREAD TAKE UP LEVER PROBLEMS

Take up lever loose 17:9

TENSION PROBLEMS

Tension lower 17:9

Tension upper 17:9

Thread slips out of tension unit 17:9

Tension release doesn’t operate 17:9

Thread catches under materials 17:9

Thread loops under materials 17:9

THREAD PROBLEMS

Thread breaks 17:9

Thread frays or shreds 17:9

QFBBR TZ1 B651

At no time does QWIK-Fix-Publications or its licensees permit the copying in any format written or electronic of any of the data provided in any of their

publications

QWIK-Fix-Publications™ 1:1

Brother TZ1 B651

IMPORTANT !!!

SWITCH THE MACHINE OFF BEFORE PROCEEDING WITH THE ADJUSTMENTS :

Bobbin Base Replacement

1. Remove the presser foot,needle plate .feed and bobbin case .

2. Turn the hand wheel towards you to observe that there are 3 screws holding the GIB plate in place

Fig 1 . Remove all 3 screws which will release the gib plate.

3. Turn the hand wheel slowly towards you until you see the hook point Fig 2.

4. With the hook point in position as Fig 3 remove the BOBBIN BASE by tilting it from the bottom. Fig 4

5. With the new base in your left hand present it at an angle Fig 4 to the hook ensuring that it locates

into the bobbin base finger Fig 5.

6. With the bobbin base located correctly turn the hand wheel towards you until you can see where the

GIB plate has to be refitted Fig 1.

7. Fit the GIB plate into position and secure the 3 retaining screws. Put a spot of mineral oil around the

base and gib plate to help smooth running in.

8. Pull machine back into its normal working position and proceed to re -assemble the presser foot,

feed and needle plate. ©

9. Fit bobbin and bobbin case.

Now test the machine for stitching quality and adjust tensions if necessary

Side Views of the Hook and Bobbin Base

Fig 1 Fig 2 Fig 3

Fig 4 Fig 5

Gib Plate

Gib Screws

Hook Point

Bobbin Base

Retainer Slot

Hook Point

New Bobbin Base

Hook

se Retainer

Hook

Bobbin Base

At no time does QWIK-Fix-Publications or its licensees permit the copying in any format written or electronic of any of the data provided in any of their

publications

QWIK-Fix-Publications™ 1:3

Brother TZ1 B651

IMPORTANT !!!

SWITCH THE MACHINE OFF BEFORE PROCEEDING WITH THE ADJUSTMENTS :

Bobbin Base Retainer

1. Push the machine forward to expose the underside of the machine.

2. Depending on the style of base retainer it should be similar to FIG 1

But may have the retaining screw the opposite side to that in the fig.

3. To replace undo the screw holding the retainer and pull the retainer away from the machine.

4. When replacing it ensure you connect the bobbin base retaining finger in the slot of the bobbin base.

N.B

The retainer may be in a slightly different location to the one shown here but the slot in the

bobbin base will be exactly the same and the retainer will look very similar to the one shown

below.

Fig1

Base Retainer

Screw

Bobbin Base

Retaining Finger

At no time does QWIK-Fix-Publications or its licensees permit the copying in any format written or electronic of any of the data provided in any of their

publications

QWIK-Fix-Publications™ 2:1

Brother TZ1 B651

IMPORTANT !!!

SWITCH THE MACHINE OFF BEFORE PROCEEDING WITH THE ADJUSTMENTS

Check Spring Adjustment

With the machine threaded and fabric under the presser foot turn the hand wheel towards you to

produce 3 or 4 stitches. STOP

Now continue to turn the hand wheel towards you until the thread take up lever Fig 1 is at its highest

point. STOP

The thread should have pulled the check spring down from its stop or rest point.

Continue turning the hand wheel slowly towards you until the eye of the needle has just entered the

fabric. STOP

The check spring should now be resting with no more tension on it.©

If it rests too early (before the eye has entered the fabric) slacken the tension unit screw Fig 2 and turn

the tension unit to the left about 1/8th of a turn and lock the screw back up.

If it rests too late (after the eye has entered the fabric) slacken the tension unit screw

Fig 2 and turn the tension unit to the right about 1/8th of a turn and lock the screw back up.

Continue to check and adjust as required.

Fig 1 Fig 2

FIG 3

Check spring

Thread Take Up Lever

Screw position is to the right of the tension unit in the

head casting.

Decrease check

Tension Unit

Check Spring adjuster Increase check

At no time does QWIK-Fix-Publications or its licensees permit the copying in any format written or electronic of any of the data provided in any of their

publications

QWIK-Fix-Publications™ 2:2

Brother TZ1 B651

IMPORTANT !!!

SWITCH THE MACHINE OFF BEFORE PROCEEDING WITH THE ADJUSTMENTS

Check Spring Replacement

1. Remove tension unit from the machine see FIG 2

2. To remove tension stud and discs complete loosen screw on tension unit see FIG 1

3. Remove the check spring from the back of the stud.

4. Fit a new spring.

5. Refit the stud to the unit tighten the stud screw FIG 1

6. Refit the tension unit to the machine. ©

7. To complete refer to the Check Spring Timing section

FIG 1 FIG 2

Thread Take Up Lever

Screw position is to the right of the tension unit in the

head casting.

Tension Unit

Tension stud retaining screw

Tension release

Check Spring

At no time does QWIK-Fix-Publications or its licensees permit the copying in any format written or electronic of any of the data provided in any of their

publications

QWIK-Fix-Publications™3:1

Brother TZ1 B651

IMPORTANT !!!

SWITCH THE MACHINE OFF BEFORE PROCEEDING WITH ANY ADJUSTMENTS :

Feed Dog Settings

Feed dog height plays 2 important functions:

1- To feed materials as evenly as possible to give a regular stitch length.

2- To aid the upper thread take up lever to complete the draw of the thread before the

feed drops to return to feed forward again.

The optimum setting for the feed is as Fig 1.

To adjust :

Turn balance wheel towards you until the feed is at its maximum height. STOP.

Push machine back on its hinges and locate the feed height fork adjuster FIG 2

Slacken screw and move feed to desired position as FIG 1. Tighten screw and test

machine.

Fig 1 Fig 2

Adjuster Screw

Hook

At no time does QWIK-Fix-Publications or its licensees permit the copying in any format written or electronic of any of the data provided in any of their

publications

QWIK-Fix-Publications™ 5:1

Brother TZ1 B651

IMPORTANT !!!

SWITCH THE MACHINE OFF BEFORE PROCEEDING WITH THE ADJUSTMENTS

Hook Timing

1. Remove the needle plate, feed dog and presser foot.

2. Insert a new needle(Long groove to the front. facing you)

3. Set the needle bar alignment to the central position

4. Turn the hand wheel towards you(NEVER AWAY FROM YOU) until the needle reaches the bottom of its stroke. Fig

1STOP!

5. Continue turning the hand wheel towards you until the needle has lifted approximately 2/3mm from the bottom of its

stroke. Fig 2.STOP!

6. At this point the hook point should be in line with the centre of the needle Fig 3.If it is the hook timing is correct and

proceed to the next section 5:2 lateral hook adjustment. If the timing is incorrect continue as follows.

7. Slacken the screws that hold the hook to the drive shaft and “PINCH TIGHTEN” one screw.

8. Turn the hand wheel towards you until the needle reaches the bottom of its stroke Fig 1.STOP!

9. Continue turning the hand wheel towards you until the needle has risen 2/3mm from the bottom of its stroke Fig 2.STOP!

10. Rotate the hook so that the point aligns centrally to the needle Fig 3..ENSURE THAT THE AIR GAP BETWEEN THE

HOOK POINT AND THE NEEDLE IS NO MORE THAN 0.02mm Fig 4 (paper thickness) Tighten all screws. That’s how

easy the hook timing is….

11. Proceed to section 6:2 needle bar height adjustment.

Fig 1 Fig 2 Fig 3 (side view) Fig 4 (side view)

Needle bar

Needle

Bottom Of

Needle

bar Stroke

2/3mm Lift

Bottom

Timed

Hook

Eye of

Needle

Air Gap

Max

0.2mm

Hook

Point

Table of contents

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