Brother b831 Service Manual page 58

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Set the feed regulator dial to 0.
Tighten the feed dog. needle plate, vibrating presser foot, and lifter presser foot.
Secure the needle O with screw O
Adjust the needle bar vibration crank O sothe gap between the presser bar O and walking presser bar O ' S 8.2 mm.
Adjust the feed driving arm ©so the needle O enters the middle of the feed dog. Firmly tighten screws O and ©when
the adjustment is completed.
Adjust the feed bar ® so the feed dog extends 1 mm beyond the needle plate top. and then tighten screw ©.
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