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Thread Tensions – All Machines
3.
Main Tensioners
!" What are they for?
Main upper thread tension control of machine.
!" When do you adjust them?
At install, then only after bobbin has been cleaned and adjusted first. Run a tension test
first, if you are still having trouble check the thread path and rethread the complete path
for the troublesome needle or change out the needle.
How do you adjust them?
At installation and for any tension problems after the bobbin has been
adjusted as well as testing for proper tensions. A good starting point is
when the top of the black screw located inside the white tension knob
is flush with the start of the screw threads inside the tension knob,
then turn the knob clockwise (tighten) two more turns. For looping
problems, turn knob clockwise (tighten) no more than one half turn at
a time. If you have to turn the knob more than two to three turns, then
there may be something else that needs to be checked. For bobbin
thread showing on top, turn the knob counter clockwise (loosen) one
half turn at a time. Again if you have to turn the knob more than two
to three turns, then there may be something else that needs to be
checked.
4.
Pre-tensioners
!" What are they for?
To provide enough tension so that the thread turns the thread break sensor wheels.
!" When do you adjust them?
At install, after removing & cleaning them, and also as a last resort along with Thread
Tree Tensioners for individual needle tail lengths during trims.
!" How do you adjust them?
5.
Thread Tree Tensioners
!" What are they for?
To take the looseness out of the thread between the thread stand to the tension base on the
machine head.
!" When do you adjust them?
At install, after removing & cleaning them and as a last resort along with pretensioners
for individual needle tail lengths.
!" How do you adjust them?
Adjust by turning the knob until the top of the silver screw inside the
knob, is even with the step inside the knob where the screw threads start.
If you have long tails, adjusting for individual needle tail lengths by
tightening the white knob one full turn, then test trim to view outcome.
If the tails are too short then loosen knob one full turn and test trim to
view outcome of adjustment.
For Technical Assistance Please Call Toll Free 1-877-4BROTHER
Plastic Knob Type
o
Adjust by turning the knob until the top of the silver screw inside
the knob, is even with the step inside the knob where the screw
threads start.
Metal Knob Type
o
Screw the knob down until the top of the knob is even with
the with the slot in the stud.
3
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