Standard Adjustments; Adjusting The Thread Take-Up Spring - Brother BAS-342G PS Instruction Manual

11. STANDARD ADJUSTMENTS

11. STANDARD ADJUSTMENTS
Maintenance and inspection of the sewing machine
should only be carried out by a qualified technician.
Ask your Brother dealer or a qualified electrician to
carry out any maintenance and inspection of the
electrical system.
Turn off the power switch and disconnect the power
cord before carrying out the following operations.
If the foot switch is depressed by mistake, the sewing
machine might start operating and injury could result.
• Inspection, adjustment and maintenance
• Replacing consumable parts such as the rotary
hook
Disconnect the air hoses from the air supply and wait
for the needle on the pressure gauge to drop to "0"
before carrying out inspection, adjustment and repair
of any parts which use the pneumatic equipment.
If the power switch and air need to be left on when
carrying out some adjustment, be extremely careful
to observe all safety precautions.

11-1. Adjusting the thread take-up spring

NOTE:
If the thread tension spring (3) is not adjusted correctly, the upper thread trailing length will be uneven after thread
trimming.
55
Higher
Lower
Stronger
Weaker
CAUTION
Hold the machine head with both hands when tilting it
back or returning it to its original position.
In addition, do not subject the machine head to extra
force while it is tilted back. If this is not observed, the
machine head may become unbalanced and fall
down, and serious injury or damage to the sewing
machine may result.
Be sure to wear protective goggles and gloves when
handling the lubricating oil and grease, so that they
do not get into your eyes or onto your skin. If the oil
and grease get into your eyes or onto your skin,
inflammation can result.
Furthermore, do not drink or eat the lubricating oil or
grease. They may cause diarrhea or vomiting.
Keep the oil out of the reach of children.
If any safety devices have been removed, be
absolutely sure to re-install them to their original
positions and check that they operate correctly
before using the machine.
Thread take-up spring height (mm)
Thread take-up spring tension (N)
<Thread take-up spring height>
Loosen the set screw (1) and turn the adjuster to adjust.
4029M
<Thread take-up spring tension>
2767B
1. Press the upper thread slightly above the tension
bracket (2) with a finger to stop the thread spooling out.
2. Pull the upper thread downward so that the thread
take-up spring (3) is extended to the same height as the
base of the thread guide arm (4), and then measure the
tension of the thread take-up spring (3).
3. Use a screwdriver to turn the tension stud (5) in order to
adjust the tension of the thread take-up spring (3).
BAS-342G PS
7 − 10
1.0 − 1.2