To Adjust The Timing Of The Needle And The Lower Looper - Janome 990D Service Manual

990D

TO ADJUST THE TIMING OF THE NEEDLE AND THE LOWER LOOPER

Correct Setting:
When the needle comes up 2.8 mm to 3.2 mm (7/64 to 1/8˝) from its lowest position, the tip of the
lower looper meets the left side of the needle (#11) on the right.
To adjust:
1. Remove the presser foot, needle plate and left-side needle.
2. Replace the right side needle with a #11 one.
3. Turn the handwheel toward you to get the lowest needle position.
4. Set the two gauges (787-G02, 787-G03), as shown in (Fig.a) and tighten bolt (B).
* There should be no clearance between the gauges and the needle bar lower bushing.
5. Remove the plate gauge (787-G03), and then turn the handwheel toward you until the needle
gauge touches the needle bar lower bushing, as shown in (Fig.b).
6. In this condition, loosen the hexagonal bolt (C) just enough to move the lower looper swing arm.
Adjust the lower looper position in order to meet the tip of lower looper with left-side of the
needle (#11), as shown in (Fig4).
Tighten hexagonal bolt (C).
7. Remove the needle bar gauge (787-G02).
* Check the clearance between the needle and lower looper.
* Check the clearance between the loopers.
8. Replace the right side needle with a #14 one.
9. Attach the needle plate and presser foot.
* Be careful not to tighten bolt (B) too much.
No clearance !!
Plate gauge
787-G03
Thickness: 3 mm
Color: Black
Lower looper
Lower looper base
Hexagonal bolt (C)
Needle bar lower bushing
Needle bar gauge
(787-G02)
(Fig. a)
Right needle (#11)
(Fig. c)
Bolt (B)
Turn the
handwheel
Lower looper
(Fig. d)
20
(Fig. b)
Right needle (#11)
3 mm