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Z-8550A, 8560A
9. ADJUSTMENTS
78
9-16. Adjusting the rotary hook lubrication amount
CAUTION
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.If they are touched, injury
may result.
Use the following procedure to check the amount of oil being supplied to the rotary hook after replacing the rotary hook or
when changing the sewing speed.
<Checking the lubrication amount>
1. Remove the thread from all points from the thread
take-up lever 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) to the left of
the rotary hook (2) 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 (1).)
5. 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.
* If adjustment is necessary, carry out the following
operations in
<Adjusting the lubrication amount>.
<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
smaller.
3. Check the lubrication amount again according to the
procedure given in
<Checking the lubrication amount>
above.
* Turn the rotary hook adjusting screw (3) and check the
lubrication amount repeatedly until the lubrication
amount is correct.
3529M
3530M
0611M
Approx. 25 mm
A
pp
rox. 50mm
Becomes
less
Becomes
more
3531M
Spattered oil
Too much oil Correct amount Too little oil