Assembly - Brother b831 Service Manual

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D] FEED ASSEMBLY
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Rotary hook shaft
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1. Slide the collars o onto the feed driving shaft O. and then slide them over the feed driving arm O and needle bar
vibrating crank O- Lightlytighten the set screws.
2. Install the opener link 0, rotary hook complete O and pinion gear O on the rotary hook base.
* Align the spiral gear and pinion gear.
* Tighten the pinion gear screw against the screw stop of the rotary hook shaft.
3. Set the feed bar lifting fork O on the feed driving shaft O, and lightly tighten the screw O.
4. Secure the feed dog 0 with screw 0.
5. Secure the needle plate 0 with screw 0
6. Tighten the set screw 0 of the collars O so the feed dog O is centered in the needle plate 0 hole.
[U NEEDLE BAR
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1. Tilt the machine.
2. Assemble the needle bar crank rod O. thread take-up slide O, and thread take-up lever 0.
3. Pass the thread take-up pin O and wick 0 through the thread take-up lever 0. and insert this assembly in the arm.
Tighten screw 0 so there is no play in the thread take-up lever 0.
* Hold the screw stop of the thread take-up pin 0 up while passing the wick through the take-up lever.
4. Insert the needle bar frame driving shaft 0 in the needle bar frame assembly 0.
5. Secure with screw 0.
* The screw stop of the needle bar frame driving shaft 0 should be facing up.
* Slide the needle bar clamp 0 on the needle bar crank rod 0. fit the needle bar frame assembly O, and install as
shown in the block 0
6. Secure the needle bar frame stop 0 with screw 0
7. Secure the thread take-up felt 0 with washer 0 and screw 0
8. Add oil to the wick 0.
* Make sure the needle bar frame 0 is not loose and that the machine works easily after assembly is completed.
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