Brother International T-8420B Instruction Manual - English - Page 39

Adjusting The Rotary Hook Lubrication Amount

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9. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT 9. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT CAUTION Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such as the rotary hook or the feed mechanism when checking the amount of oil supplied to the rotary hook, otherwise injury may result. Use the following procedure to check the amount of oil being supplied to the rotary hook when replacing the rotary hook or when changing the sewing speed. 2998M 1. Tilt back the machine head. 2. Turn the oil adjusting screw (1) to adjust the height to within 9-14 mm. More oil Less oil Spattered oil Too much Correct 33 2942M 1. Turn off the power switch. 2. Remove the thread from all points from the thread take-up to the needle. 3. Remove the needle and the bobbin. 4. Use the lifting lever to lift the presser foot. 5. Turn on the power switch. 6. Run the machine at the normal sewing speed for approximately 1 minute without sewing any material (following the same start/stop pattern as when actually sewing). 7. Place the lubrication amount check sheet (2) to the left of the rotary hook (the right side is the right side of the rotary hook), and hold it in place while running the sewing machine at the normal sewing speed for approximately 8 seconds. (Any type of paper can be used as the lubrication amount check sheet (2).) 8. Check the amount of oil which has spattered onto the sheet. Too little 1. Tilt back the machine head. 2. Turn the adjusting screw (1) to adjust the lubrication amount. ・ If the rotary hook adjusting screw (1) is turned counterclockwise, the lubrication amount becomes greater. ・ If the rotary hook adjusting screw (1) is turned clockwise, the lubrication amount becomes smaller. 3. Check the lubrication amount again according to the procedure given in "Checking the lubrication amount" above. * Turn the adjusting screw (1) and check the lubrication amount repeatedly until the lubrication amount is correct. 4. Check the lubrication amount again after the sewing machine has been used for approximately two hours. 3000M T-8420B, 8450B, 8720B, 8750B

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T-8420B, 8450B, 8720B, 8750B
9. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT
33
9. ADJUSTING THE ROTARY HOOK LUBRICATION
AMOUNT
CAUTION
Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such as the rotary
hook or the feed mechanism when checking the amount of oil supplied to the rotary hook, otherwise injury may
result.
Use the following procedure to check the amount of oil being supplied to the rotary hook when replacing the rotary hook or
when changing the sewing speed.
<Guide to lubrication adjustment>
1. Tilt back the machine head.
2. Turn the oil adjusting screw (1) to adjust the height to
within 9-14 mm.
<Checking the lubrication amount>
1. Turn off the power switch.
2. Remove the thread from all points from the thread take-up
to the needle.
3. Remove the needle and the bobbin.
4. Use the lifting lever to lift the presser foot.
5. Turn on the power switch.
6. Run the machine at the normal sewing speed for
approximately 1 minute without sewing any material
(following the same start/stop pattern as when actually
sewing).
7. Place the lubrication amount check sheet (2) to the left of
the rotary hook (the right side is the right side of the rotary
hook), and hold it in place while running the sewing
machine at the normal sewing speed for approximately 8
seconds. (Any type of paper can be used as the
lubrication amount check sheet (2).)
8. Check the amount of oil which has spattered onto the
sheet.
<Adjusting the lubrication amount>
1. Tilt back the machine head.
2. Turn the adjusting screw (1) to adjust the lubrication
amount.
・
If the rotary hook adjusting screw (1) is turned
counterclockwise, the lubrication amount becomes
greater.
・
If the rotary hook adjusting screw (1) is turned
clockwise, the lubrication amount becomes smaller.
3. Check the lubrication amount again according to the
procedure given in “Checking the lubrication amount”
above.
*
Turn the adjusting screw (1) and check the lubrication
amount repeatedly until the lubrication amount is
correct.
4. Check the lubrication amount again after the sewing
machine has been used for approximately two hours.
2998M
3000M
Spattered oil
Too much
Correct
Too little
More oil
Less oil
2942M