Brother Lh4 B814 Manual

.I Presser mechr:'ism.-Approx. Insert the presser bar 0 from the top of the arm.2.Mount the presser bar guide bracket 8 onto the groove in the arm, and then pass the presser bar 0 through thepresserbar guide bracket G.3. Mount the washer 8, the presser bar spring 8, and the presser bar spring guide 8, and then tighten the presserfoot adjustment screw8.(Mount the thread wiper holder onto the presser bar 0 and secure it with the screw.)4.

Mount the presser foot 8 onto the presser bar 8 with the screw 8.5. Adjust the height of the presser foot 8 to approximately 6 mm.Coverl'l Screw./ Thread wier.

Mount the tension regulator assembly 0 with the screw G.(The thread take-up spring operating range is 8 mm and the tension is 20 to 30 kg.)2. Mount the oil stopper plate 8 with the screws 8.3. Mount the oil cap 8 and the oil cap 8.4. Mount the rear cover 8 and the packing 8 with the screws C).5.

Mount the face plate f) and the packing CD with the screws CB.(Mount the thread wiper with the screw.)-19-From the library of: Superior Sewing Machine & Supply LLC. I Needle and rotary hook timing adjustmentsIn order for the tip of the rotary hook to catch the loop in the needle thread when the needle rises from the lowestpoint. The needleand rotary hook must be correct.1. Needle bar height.Reference line. Turn the pulley slowly. And lower the needle bar 8 to the needle down position. Confirm that the second frombottom reference line on the needle bar 8 is aligned with the bottom of the needle bar bushing.

Loosen set screw 8 and align this second reference line with the bottom of the needle bar bushing 8. Firmly tighten set screw8.2. Rotary hook position0Reference line. Turn the pulley slowly.

And align the bottom reference line on the needle bar 8 with the bottom of the needle barbushing 8. With the needle bar in this position. Check that the rotary hook pointe is aligned with the needlecenter0 and that the needle 0 to rotary hook point 8 gap is between 0.05 -0.1 mm. Loosen set screw 8 and after aligning the rotary hook point 8 with the needle center 0. Adjust the needle 0to rotary hook point 8 gap to between 0.05 -0.1 mm.

Firmly tighten set screw 8. Always perform the steps for rotary hook lubrication adjustment after replacing the rotary hook.-20-From the library of: Superior Sewing Machine & Supply LLC. III Feed dog height adjustment.

A. j B.AF1BFeed dog height,-Rises in the forward direction ::l t=:=.,r- Descends in the forward direction:::::1 c::::::::=./I.

The standard height of the feed dog for sewing thin materials is 0.8 mm. For medium materials 1.0 mm, and forthick materials1.2 mm (when the stitch length is set to the maximum).2. Adjust the feed dog height by loosening the screw 8 when the feed dog 8 is at its height position from theneedle plate surface, and move the feed liftingarm 0 up and down.Feed dog angleI. The standard angle of the feed dog 8 (horizontal to the needle plate surface when the feed dog is at its highestposition)is obtained by matching the 0 mark of the feed plate shaft 8 with the notch on the feed bar arm 8. In order to prevent packering. Raise the feed dog 8 in the forward direction.

In order to prevent the material from slipping. Slant the feed dog 8 in the forward direction.2.In order to adjust the feed dog angle, loosen the screws 8 and then turn the feed plate shaft 8 90° in thedirections indicated by the arrows. When the feed dog angle has been adjusted, check to confirm that its height has not changed.I) Feed timing adjustmentFeed dogI. Turn the pulley manually; the area of the needle between the tip and the lower edge of the eye should be inalignment with the top surface of the needle plate when the feed dog completes the feed and retracts so that thetipof the feed dog is level with the top surface of the needle plate.2. If the feed timing is not correct, loosen the set screw 8 of the feed cam 8 and adjust.If the feed dog retracts too early, turn the feed cam slightly in the opposite direction from which the machineturns; if the feeddog retracts too late, turn the feed cam slightly in the same direction as that in which themachine turns.3. After adjusting the timing, tighten the screw securely.I Presser height adjustment.

The amount of presser foot rise should be 6 mmwhen the presser foot8 is raised by the presserbar lifter lever 8.Turn the presser regulating screw 0 and lowerthe presserbar lifter lever 8.Remove the cap 8 from the front cover. Loosenthe screw8. And move the presser bar 8 up anddownto adjust it.-21-6mmFrom the library of: Superior Sewing Machine & Supply LLC. IT Synchronizer adjustment1. Position adjustment of the thread trimmer signal18-22 mmSynchronizer Adjustment (8707 /8716)1. Turn off the power of the machine.(If the hole ICs are to be adjusted. It is important that the power first be turned off.)2.

Remove the synchronizer cover.3. Rotate the pulley towards youand stop the needle 5 mm above its lowest point. The lower end oft he magnet 0must be aligned at this time with the upper edge of the thread-trimmer hole IC 8. If the lower end of the magnet 0 and the upper edge oft he thread-trimmer holeIC8 are not aligned, adjust byloosening the screw8 and moving the thread-trimmer hole IC.4.Turn on the power and stop the machine at the needle-down positidh. At this time the needle bar must stop 18-22 mm above the surface of the needle plate.If the needlebar does not stop at this position, adjust by loosening the screw 8 and moving the needle-downhole IC8.5. Stop the machine at the needle-up position. The point of the needle must stop 9 -II mm above the needle platefor thinand medium thickness materials.

And 10 -12 mm above the needle plate for thick materials.If the point of the needle does not stop at this position, adjust by loosening the screw 8 and moving the needle­up hole IC f). The needle bar will lower when hole IC 8 and hole IC 8 are moved in the direction of machine rotation.

Andrise when they are moved in the opposite direction.Synchronizer Adjustment (8747)I. Turn off the power of the machine.(If the hole ICs are to be adjusted, it is important that the power first be turned off.)2. Remove the synchronizer cover.3. Rotate the pulley towards youand stop the needle 7 mm above its lowest point. The lower end of the magnet 0must be aligned at this time with the upper edge of the thread-trimmer hole IC 8.If the lower end of the magnet 0 and the upper edge ofthe thread-trimmer hole IC8 are not aligned. Adjust byloosening the screw8 and moving the thread-trimmer hole IC.4.Turn on the power and stop the machine at the needle-down position. At this time the needle bar must stop 18-22 mm above the surface of the needle plate.If the needlebar does not stop at this position.

Adjust by loosening the screw 8 and moving the needle-downhole IC0.5. Stop the machine at the needle-up position.

The point of the needle must stop 9 -II mm above the needle platefor thinand medium thickness materials, and 10-12 mm above the needle plate for thick materials.If the pointof the needle does not stop at this position, adjust by loosening the screw 8 and moving the needle­up hole IC f). The needle bar will lower when hole IC 8 and hole IC 8 are moved in the direction of machine rotation, andrise when they are moved in the opposite direction.-22-From the library of: Superior Sewing Machine & Supply LLC. 11 Thread trimmer adjustment1. Replacement of the fixed knife and movable knife. Turn off the power.ilstoneRemoval of the fixed knife(I) Tip the machine of its side.(2.) Remove the screw 0 and the rotary hook position bracket 8.(3) Remove the screw 8 and the fixed knife 8.@ If the thread trimmer should need sharpening, sharpen the fixed knife 8 as shown in Fig.

A.Removalof the movable knife(I) Use the presser foot lifter lever to lift the presser foot.(2) Remove the screw8 and the needle plate 8.(3) Turn the pulley until the needle bar is at its highest position.(4)Press the thread trimmer connecting bar 8 in the direction of the arrow and stop in at the point where thescrew8 can be seen.(5) Remove the screw8 and the movable knife 8. Remove the needle plate 8 and the movable knife 8 only after the needle has been removed.

Assemble in the reverse order of disassembly.2. Adjustment of the fixed knife, movable knife, and lower thread finger1-1.5 mm Fig. (I Tension release lever adjustment. Adjust the nut f) so that the thread trimmersolenoid0 moves easily for the first 0 -2 mm(tension release lever doesnot operate) and resistsmoving for the next 2-5 mm.Confirmthat the tension disc 8 opens 0.5-I mmat this time.Also, when the solenoidis not operating, confirmthat the disc is firmly closed.!Thread wiper adjustmentI.

Attach the thread wiper bearing 0 so that when thepresser footis lifted with the knee lifter, it does notcome in contact with the presser bar.2. Loosen the thread wiper lever screw and positionthe thread wiper leverf) so that the groove of thegrooved link8 is vertical to the bed surface.3. Attach the thread wiper 8 so that the end of it doesnot come in contact with the presser foot when thepresser footis raised.! Automatic presser foot lifter adjustment ( -900; electromagnetic type)oo=?:mmm Tighten fully.,. £dogKnee liftero.a-O.s mm complying bar f)Presser foot lifter link Adjustablerange.I.Adjustment of the solenoid and plungerAdjust sothat the noise (impact noise) made by the presser foot when it is lifted is small.Turn the adjustment nut 0 so that the space between the solenoid and the plunger f) is 0.6 -0.8 mm.2.

Brother Lh4-b814-2 Manual Pdf

Damper support joint adjustmentAdjust sothat the noise (impact noise) made by the presser foot when it comes down is small.Se the feeddog in its lowest position.Loosen the screw8. And after adjusting the space between the knee lifter push bar and the presser foot lifter linkto 0.3-0.5 mm, match up the damper support joint 8 with the rubber cushion 8.3. Damper adjustmentAdjust the speed the presser foot comes down with theadjustment screw 8 of the damper 8. Adjust theadjustment screw8 to approximately 30° from the fully tightened position. When the adjustment screw 8 is to tight. The presser foot will not come down (will not press against thematerial).If this screw is too loose, the presser foot will come down too fast, thus making an impact noise and possiblydamaging the material being sewn. The above procedure (I -3) is the standard adjustment; however, there may be subsequent variations due tochanges in presser foot pressure and power supply voltage.-24-From the library of: Superior Sewing Machine & Supply LLC.

T=R=O=U=B=L=E=SHO=O=TI=N=G=G=U=I=D=E=.:::::::::I Machine headI Trouble I L.-1 cause - 1.-check I IL-Solution.l Page Ir-Improper needle installation 1-Needle bias. Height -Reinstall properly/-Bent needle, bluntneedle tip, blocked needle hole 1-Needle.

Replace needle/-Improper feed timing 1-Is material fed when needle f-Adjust timing 21 is in material?Needle breaksr-Refer to. Needle and Rotary -Needle bar lift stroke -Hook Timing Adjustment 20.

Improper needlehook timing torotary r-r-Needle bar height r-Refer to. Needle and Rotary 20 Hook Timing Adjustment-Needle to rotary hook gap r-Refer to.Trouble-,J.II L.-cause - L.-Check - IL.,Solution.-.1 Page I-Improper needle installation -Needle bias. Height -Reinstall properly/-Bent needle or blunt needle -Needle bias, height -Replace needlev tip-Improper threading -Threading.-Rethread properly/r-Needle bar lift stroke 1-Refer to Needle and Rotary 20 Hook Timing AdjustmentSkipped stitches I-I-Improper needle to rotary f-f-Needle lift length 1-Refer to.Trouble.l cause.II-check ,II solution Page IThread trimmer misses Movable and fixedknives Checkalignment of thread trimmer Align movable andfixed 23 r-do not meet 1-holder and thread trimmer holder -knives presser i ndcx marksa. Neither upper or low-Movable and fixed knife blades Movable andfixed knifeReplace movable and fixed 23 er thread is cut r-are burred or abraded t-blades -knives Movable and fixed knife Is threadtrimmersignal f-Check electrical circuitryv-does not move t-output?-Improper needle installation f-Needle bias -Reinstall properly/b.

Upper thread is not Stitch skips at last stitch and Thread take-up spring Adjust thread take-upvr-upper thread trimmer does not f-cut catch upper thread stroke springMovableand fixed knives Check alignment of thread trimmer.Align movable andfixed 23 r-do not meet t-holder and thread trimmer holder -knives presser index marksPoor cutting by movable Movableand fixedknifeReplace movable and fixed 23 r-and fixed knives -blades -knivesc. Lower thread is not.

Brother Lh4-b814 Service Manual

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