Brother b837 - Stitches skip

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(! ROUBLESHOOTING GUID ~
[
LS2-
B837 J
LT2-B838
~--- T - ro _ u _ b _ l e --~~ Ll _______ c _ a _ u _ s _ e ------~ ~~ L _______ c _ h _ e _ c _ k ------~~ LI _______ R_em __ e_ dv ______ ~
Upper thread
breaks
Lower thread
breaks.
Uneven
stitches.
Stit
ches sk1p .
Needle bent. needle liP
crushed
Needle mcorrectly mstall-
ed.
Wrong threadmg
Upper thread tens1on too
tight.
Wrong clearances between
rotary hook and
bobb1n case
opener.
Wrong needle and r otary
hook t1m1ng .
Wrong thr eadmg .
Lower th read tens1on t oo
tight.
Bobbtn sta1ned with otl or
lint.
Needle bent. needle
t1p
crushed
Presser foot pressure t oo
small .
Wrong feed dog he1ght
Wrong upper feed !lmtng .
Needle bent. needle t1p
crushed .
Needle
Incorrectly mstall-
ed
Wrong threadmg
Presser foot pressure too
small
Wrong needle and ro t ary
hook t1m1ng .
Wr ong upper feed t1 mmg .
Needle.
Needle
dtrect1on.
Threadmg .
Up per thread tens1on.
Thread
mg .
lntens1ty of l ower thread
tens1 0n regulator screw .
Needle.
Presser foot pressure.
Feed
dog he 1 gh t.
Needle.
Needle direct1on and
he1ght.
Thread1ng.
Presser foot pressure.
Replace faulty
needle
Install needl es 1n correct
dtrect1on
See the section for upper
thread1ng.
See the section for thread
tens1on
See the sect1on for needle and
rotary hook t1mmg adjustment
See the sectoon for needle and
r01ary hook t1mmg adjustment
See the sect10n for lower
thread1ng.
Ad 1 us1 10 proper tens1 on
Remove ltnt and o tl
thoroughly .
Repi LJCP. f; lll lty n m~ d lt'
See t he section f or presser
foot ad1us t ment.
See the sect1on for feed
dog he1ght ad1ustmen t.
See the se c t1on for v1b r at1ng
presser foot and llftmg pr esser
foot and needle t1m1ng adjuSt·
ment
Replace faulty needle.
See the section for lnstall-
mg the needle.
See the section for upper
thread1ng
See t he section for presser
foot ad1ustment.
See the secuon for needle and
rotary
hook t1m1ng adtustmenl.
See t he sect1on for v1brating
presser foot and llfton g presser
foot and needle tim1n g adJUSt ·
me nt .
From the library of: Superior Sewing Machine & Supply LLC