16
TO ADJUST THE CLEARANCE BETWEEN
THE NEEDLE AND THE LOWER LOOPER /
NEEDLE GUARDS.
Correct setting:
The needle should have an equal clearance between the front edge of the needle holes on the needle plate.
The standard clearance between the needle and the lower looper is 0 mm to 0.05 mm.
The standard clearance between the needle and the rear needle guard is 0 mm to 0.2 mm.
The above standard clearance allows the needle to slightly touch the front needle guard.
To adjust:
1:
Remove the face plate unit, presser foot, needle plate and needle.
2:
Before loosening set screw C, attach the needle gauge #787-G02 to prevent change of needle bar height
during the adjustment.
Attach #11 needle on the needle cramp and loosen the set screw C. Retighten the set screw C and
remove the needle gauge.
3:
Turn the handwheel towards you to bring the tip of the lower looper from the left hand to the rear side of the
needle.
4:
Loosen the hexagonal socket screws A on the front needle guard and open a space between the front
needle guard and the needle.
5:
Next, loosen the hexagonal bolt B, and slide the lower looper unit to the front or to the back toadjust the
clearance between the needle and the lower looper.
The clearance should be 0 mm to 0.05 mm.
6:
Change the needle from #11 to #14.
7:
Push the needle by the front needle guard to adjust the clearance between the needle and the lower
looper.
The clearance should be 0 mm to 0.05 mm.
8:
Turn the handwheel towards you to check the clearance between the needle and looper.
Make sure the front needle guard is touching the needle slightly and the rear needle guard is not touching
the needle.
9:
Check the timing between the needle and the lower looper.
10: Recheck the needle bar height and the clearance between the needle and the lower looper.
