Brother sewing machine problem with automatic cutter

SOURCE: Brother Sewing Machine model:CS8150 bobbin thread problems

The top of the machine is not threaded correctly. First raise the presserfot then rethread the machine. Bottom looping is usually caused by a lack of top tension. There could allso be a bur on the hook.

SOURCE: can't shirr on new brother sewing machines!

The bobbin case tensions are "preset" from the factory. I would not recommend turning the tension screw that is locked with paint. You can however get a replacement case and break the seal and use that one for specialty thread and such.

SOURCE: How to thread a Brother cs-100 sewing machine

Please follow the link below, for the manual

http://welcome.solutions.brother.com/BSC/public/files/dlf/doch000207/cs100ex660qg01enfres.pdf

SOURCE: Top thread on my Brother

rethread the machine
try a top thread tension of 3 or 4
change the needle
always keep a thread tail of 3-5 inches on top & bobbin thread & keep the thread pulled back behind needle before starting to sew
always keep the bobbin area clean of lint & loose thread
& check under the needle plate for lint also
you might consider having the machine serviced, since you said it sounds like a tractor
some needle & thread are not compatable-try this

Cut 6-8 inch piece of thread of the spool you are going to use for your project
Take the needle you are going to use for the project
& insert the thread thru the eye of the needle
& lift one end of the thread to a 45 degree angle
& if the needle is the right size for the thread it will slide down the thread
But if the needle hangs on the thread you need one size larger needle for the thread

SOURCE: brother vx-1435, needle cuts thread when sewing

change the needle it could have a burr or be damaged
also check the needle plate & bobbin area for burrs