Brother b831 Service Manual page 53

[2] WALKING BAR ASSEMBLY
J
1. Remove the two screws O. and remove the feed lifting rocker shaft O-
(Remove the face plate thumb screw if one is present.)
2. Remove the two screws O- and remove the washer O and the lifting presser foot guide 0.
3. Turn the nut on the bell crank roller O with a wrench and remove the roller O.
4. Remove the bell crank O.
5. Remove the bell crank link O.
6. Remove the wick and remove the walking bar presser foot link O.
7. Remove the lifting presser foot adjustment screw ®. walking presser bar presser ®, walking presser spring 0. and
walking presser bar ®.
8. Loosen screw 0
9. Remove wing nut 0. lock washer 0, spring washer 0, and hinge screw 0.
10. Loosen screw 0. and walking bar eccentric crank 0.
[1] PRESSER FOOT 0
0)
1. Remove the cap O.
2. Loosen the screw 0 ofthe presser barguide bracket 0. thescrew 0 ofthe presser barlifter 0. andthescrew O ofthe
presser bar guide 0. and then remove the presser bar 0.
3. Remove the presser bar guide 0. presser bar lifter 0, and presser bar guide clamp 0.
4. Remove thetension release lever 0 andthread tension release slide 0 together with the presser barguide bracket 0.