Adjusting The Rotary Hook Lubrication Amount - Brother LZ2-B850 Service Manual

5. ADJUSTMENTS

5-17. 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.
Approx. 50mm
q
Too much
e
Less oil
5-13
Approx. 25mm
q
w
5-15mm
Spattered oil
Correct Too little
More oil
CAUTION
<Checking the lubrication amount>
0609M
1. Run the machine at the normal sewing speed for ap-
proximately 1 minute without sewing any material (fol-
lowing the same start/stop pattern as when actually
sewing).
2. Place the lubrication amount check sheet q to the left
of the rotary hook w and hold it there. Then run the
sewing machine at the normal sewing speed for 10
seconds.
(Any type of paper can be used as the lubrication
amount check sheet q.)
3. Check the amount of oil which has spattered onto the
sheet.
* Be sure to repeat this operation three to four times to
check average lubrication amounts.
0610M
0611M
<Adjusting the lubrication amount>
1. Tilt back the machine head.
2. Turn the lubrication adjustment screw e to adjust the
lubrication amount.
3. Return the machine head to the upright position.
4. Check the lubrication amount again according to the
procedure given in "Checking the lubrication amount"
above.
* Turn the lubrication adjustment screw e and check
the lubrication amount repeatedly until the lubrica-
tion amount is correct.
5. Check the lubrication amount again after the sewing
machine has been used for approximately two hours.
0612M
LZ2-B850,B851