Brother b831 - Movable and Fixed Knife Adjustment

Installing the movable and fixed knives
0.05 ~ 0.2 mm
(1)
(2)
(3)
(4)
(5)
(6)
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(8)
Turnthe machine pulley by hand until the bobbin case openers are pulled all the wayin the arrow direction.
Temporarily fasten the movable knife O with the screws O. and operate the movable knife ©while pressing it with
your finger from above.
(Securely tighten the screws © after the clearance between the tip ofthe movable knife andthe holder bracket issetto
0.05 ~ 0.2 mm.)
Fasten the fixed knife © to the needle plate with the screws ©. (Note the fixed knife has right and wrong sides.)
Fastenthe needle plate with the screws © and ©.
Fasten the cover © with the screws ©.
Tilt the head back and install the knife return spring ©.
Return the head to its original position.
Install the needles m the needle clamp and lower the presser foot.
Oil whetstone gg g^jj.g jj^g gjjge is
clean and sharp.
Cutting part
A ragged edge
may result m
thread breakage
If the knives become blunt,sharpen the fixed knives ©
as shown.
The movable knife © cannot be sharpened with an
ordinary whetstone.
If it becomes blunt, replace it with a new one.
Movable knife © to rotary hook contact or excessive knife to hook gap may result in improper thread cutting.
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