Feed Dog Adjustment In Back And Forth Directions; Excessive Presser Bar Walking Presser Bar Gap - Brother b831 Service Manual

[H FEED DOG ADJUSTMENT IN BACK AND FORTH DIRECTIONS
1.5 mm
Turn the feed adjusting dial to position 0.
Loosen screws O and O- and adjust feed dog O so that the center of its needle hole will be as shown above.
After the adjustment, securely tighten screws O and O
Turn the machine pulley until the needle bar is up in its highest position.
Check the needle to be sure that it is not bent. Or. replace it with a new needle.
Slowly turn the machine pulley, and see if the needle falls exactly in the center of the needle hole in feed dog O, (The
presser bar to walking bar presser bar gap is 8.2 mm.)
If the needle does not fall exactly in the center of the needle hole in feed dog O- adjust it in the following manner.
Remove the rear cover, and loosen screw O'
[ylove needle bar support 0 little by little until the tip of the needle is in linewith the center of the needle hole in feed
dog O,
After the adjustment, tighten screw O securely.
Strikes needle plate if
gap is insufficient.
S Excessive presser bar and walking
presser bar gap
• The feed dog willstrike the needle platewhen
the feed regulator dial is set to maximum.
• Skipped stitches, broken needles.
• Improper thread trimming when the thread
cutter is used.
Strikes needle plate if
gap is excessive.