Adjusting The Rotary Hook Lubrication Amount (-[]0[], []3[] Specifications) - Brother S-7200B Service Manual

5. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT (-[]0[], []3[] specifications)

5. ADJUSTING THE ROTARY HOOK LUBRICATION
AMOUNT (-[]0[], []3[] specifications)
Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such as the rotary
hook or the feed mechanism when checking the amount of oil supplied to the rotary hook, otherwise injury may
result.
Use the following procedure to check the amount of oil being supplied to the rotary hook when replacing the rotary hook or
when changing the sewing speed.
NOTE:
If the sewing machine is sub-class -[]5[], it is a fully dry-type machine and so adjustment of the rotary hook lubrication
amount is not necessary.
Approx. 70mm
Too much
23
Approx. 25mm
5–10mm
Spattered oil
Correct Too little
Less oil
CAUTION
<Checking the lubrication amount>
2303M
1. Remove the thread from all points from the thread take-up
to the needle.
2. Use the lifting lever to lift the presser foot.
3. Run the machine at the normal sewing speed for
approximately 1 minute without sewing any material
(following the same start/stop pattern as when actually
sewing).
4. Place the lubrication amount check sheet (1) underneath
the rotary hook (2) and hold it there. Then run the sewing
machine at the normal sewing speed for 8 seconds. (Any
type of paper can be used as the lubrication amount
check sheet (1).)
5. Check the amount of oil which has spattered onto the
sheet.
Bed
If adjustment is necessary, carry out the following operations
2304M
in "Adjusting the lubrication amount".
NOTE:
If the lubrication amount does not match the correct
amount shown in the illustration at left (if the amount of
spattered oil is too much or none at all), turn the adjusting
screw (3) clockwise to fully tighten it, turn it back
counterclockwise by 2 1/2 turns, and then carry out the
following adjustment.
0935M
<Adjusting the lubrication amount>
1. Tilt back the machine head.
2. Turn the adjusting screw (3) to adjust the lubrication
amount.
・ If the rotary hook adjusting screw (3) is turned
clockwise, the lubrication amount becomes greater.
・ If the rotary hook adjusting screw (3) is turned
counterclockwise, the lubrication amount becomes
More oil
smaller.
3. Check the lubrication amount again according to the
procedure given in "Checking the lubrication amount"
above.
* Turn the adjusting screw (3) and check the lubrication
3686M
amount repeatedly until the lubrication amount is
correct.
4. Check the lubrication amount again after the sewing
machine has been used for approximately two hours.
S-7200B