Brother 2340CV Service Manual Download Page 11

Page: 11 / 16

HOW TO ADJUST......

Thread tension adjustment

1. Set the thread tension dial to "4" on the dial scale.

2. Insert a plate of approx. 0.5 mm (0.02 in.) of thickness into the right side slot of the thread tension dial "4"

position on the dial scale and pull the notch of the dial clutch.

Then while holding the plate, turn the dial to adjust the thread

• Direction

: increase tension

• Direction

: decrease tension

PLATE: XB1037001

Plate

Notch of dial clutch

For normal operation

Thread tension nut

Notch of dial clutch

For adjustment

Pull the notch

Clutch will be
released

Dial clutch

Summary of Contents for 2340CV

Page 1: ......

Page 2: ... the double chain looper 5 Timing of the lowerlooper 6 Height of feed dog with a differential feed dog 7 Feed timing 8 Height of presser bar 9 Thread tension adjustment 10 Position of thread take up 11 Position of looper thread take up 12 Adjustment and replacement for the timing belt 13 Changing the light bulb 14 ...

Page 3: ...e Check list for better sewing in the Instruction Book before you attempt any adjustment from this manual However if it is necessary to adjust the mechanism use this manual together with the PARTS CATALOGUE for each model Find the fault in question in the Fault finding chart and follow the corrective measures in this manual 1 Adjust each model number circled in each illustration and instruction 2 ...

Page 4: ...5 8 6 2 mm NOTE When making this adjustment keep the needle bar at its highest position by holding the handwheel Use the left needle of the three needles to adjust the height After completing adjustment check that the needle lowers to the center of the needle descents PARTS CODE FOR GAUGE XB1282001 2 5 8 6 2 mm 3 1 3 Left needle Three needle models How to use the gauge SCHMETZ 130 705H 90 Needle p...

Page 5: ...ing position the double chain looper correctly 2 Too much adjustment will cause damage to other parts or cause the needle to skip stitches How to use the gauge 1 Position the gauge as shown in the illustration 2 Firmly tighten the screw Double chain looper Set screw DL lever 7mm ...

Page 6: ...ition place the pointed end of the double chain looper against the right side of the needle The point of the double chain looper should be between 0 0 05 mm from the needle 2 Firmly tighten bolt 5 16 Right needle 3 mm 0 2 Movable needle guard Movable needle guard Double chain looper Left needle Three needle models 0 0 05 mm Bolt 5 16 0 0 05 mm 0 0 05 mm ...

Page 7: ...er 2 Lower the needle bar to its lowest position 3 Position the spacer and gauge and tighten the screw 4 Remove the spacer 5 Raise the needle bar until the needle clamp contacts the gauge Continue making the adjustment described on the previous page The spacer is 3 0 mm thick Presser bar Gauge Spacer 3 4 2 Needle bar 3 0 mm 5 Gauge Needle clamp ...

Page 8: ...d sufficiently or feed dog will touch other parts like double chain looper in case feed dog reaches to lower position Set the cut mark on the vertical adjusting shaft to the front and then adjust the vertical adjusting shaft Adjustment for height of differential feed dog Differential feed dog should be the same level as upper surface of needle plate when main feed dog goes down and reaches the sam...

Page 9: ...s inclined 1 Open the cloth plate cover and loosen the set screw socket M 5 6 two of the feed eccentric wheel by means of a hexagonal wrench 2 Turn the feed eccentric wheel to adjust the timing as shown in the illustration In case of early timing in other words when the feed dog is still positioned over the needle plate turn the wheel in direction A In case of late timing in other words when the f...

Page 10: ...resser bar is horizontal raise or lower it until the first step is 4 8 5 0 mm above the needle plate Check also to make sure that the needle descents of the presser bar are not noticeably out of alignment with the needle descents of the needle plate 3 After the adjustment has been completed tighten the set screw 5 95 securely that holds the presser bar winding in place Set screw 5 95 1 Presser bar...

Page 11: ... thread tension dial 4 position on the dial scale and pull the notch of the dial clutch Then while holding the plate turn the dial to adjust the thread Direction A increase tension Direction B decrease tension PLATE XB1037001 Plate A B Notch of dial clutch For normal operation Thread tension nut Notch of dial clutch For adjustment Pull the notch Clutch will be released Dial clutch ...

Page 12: ...UST Position of thread take up 1 Lower the needle to its lowest position 2 Loosen the set screw and position the thread take up below the thread retainer by 0 1 5 mm Thread retainer 0 1 5 mm Thread take up Set screw ...

Page 13: ... at its highest position and adjust the distance from the F cover hinge to the thread take up as shown in the illustration below 3 After completing adjustment tighten the DL thread take up set screw F cover hinge plate 43 0 45 0 mm 39 5 41 5 mm Set screw DL Thread take up lever B DL Thread take up lever A Upper of F cover hinge plate ...

Page 14: ...te right and left so that the belt can be pushed down 5 0 6 0 mm when applying a pressure of 500g NOTE When the belt is worn replace it in the same manner The 3p socket and the oil pan should be parallel 6 After adjustment assemble the covers in the reverse order Presser lever Belt cover c Rear cover c Cloth plate cover c Front cover Timing belt Parallel 3P socket Motor plate Oil pan Motor Handwhe...

Page 15: ...crew pull up the light bulb cover and remove it Take out the light bulb and replace it with a new one After replacing the light bulb assemble the parts in the reverse order Caution Always be sure to turn off the power before carrying out the following operation Screw bind M 4 6 Lamp cover Light bulb cover Screw bind M 4 6 Light bulb Light bulb cover ...

Page 16: ......

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Brother 2340CV, Service Manual

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