7-14.Adjusting The Rotary Hook Lubrication Amount - Brother S-710A Service Manual

7. ADJUSTMENTS
7-14. Adjusting the rotary hook lubrication amount
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 changing from the normal rotary hook to the rotary hook RP (lubrication - free rotary hook), a different
procedure should be followed. Refer to page 74 for further details.
Approx. 70 mm
(2)
Too much
Correct
73
Approx. 25 mm
(1)
Bed
(1)
5 - 10 mm
Spattered oil
Too little
(3)
More oil
Less oil
CAUTION
Checking the lubrication amount
0933M
1. 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).
2. 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).)
3. Check the amount of oil which has spattered onto the
sheet.
0934M
0935M
Adjusting the lubrication amount
1. Tilt back the machine head.
2. Turn the
approximately 45° to adjust the lubrication amount.
• If the rotary hook lubrication adjustment screw (3) is
turned clockwise, the lubrication amount becomes
greater.
• If the rotary hook lubrication adjustment screw (3) is
turned counterclockwise, the lubrication amount
becomes smaller.
3. Check the lubrication amount again according to the
0936M
procedure given in "Checking the lubrication amount"
above.
* Turn the lubrication adjustment screw (3) and check
the lubrication amount
lubrication amount is correct.
4. Check the lubrication amount again after the sewing
machine has been used for approximately two hours.
SL-710A
lubrication adjustment
repeatedly until
screw (3)
the