Janome 3128, Service Manual

MODEL 3128

13

CLEARANCE BETWEEN NEEDLE AND HOOK (NO.2)

TO CHECK:

Use this adjustment method No.2 if the clearance cannot be adjusted with the method No.1.
The clearance between needle and shuttle hook should be -0.05 - 0.10 mm.

ADJUSTMENT PROCEDURE:

1. Set the pattern selector dial at maximum zigzag width, and turn the handwheel toward you to bring

the needle to the left needle position.

2. Open the shuttle cover and loosen the lower shaft bushing (front) setscrew 

"

A

"

. Then slide the

lower shaft to the right side slightly (approximately 0.5 mm) not to disengage the gears, and tighten

the setscrew temporary.

3. Loosen the setscrews 

"

B

"

 (2 pcs.) through the holes in the rear cover, and slightly move the shuttle

body up or down to adjust the clearance between needle and shuttle hook to -0.05 - 0.10 mm, and
tighten the setscrews 

"

B

" 

temporary.

4. Turn the handwheel to check the clearance between shuttle race spring and needle in left and right

positions. If the clearance is not equal, adjust it by turning the shuttle race body.

5. Tighten the shuttle race setscrews "B" (2 pcs).
6. Loosen the setscrew "A" on lower shaft bushing and slide the gear back to the original position

while adjusting the backlash.

7. Tighten the setscrew "A" firmly.

Note: The rotary play of the hook driver should be 0.3 mm or less and lower shaft turns smoothly.

After the adjustment, check the hook timing.

MECHANICAL ADJUSTMENT

SETSCREW "A"

-0.05 - 0.10 MM

CLEARANCE SHOULD BE EQUAL

SHUTTLE RACE SPRING

NEEDLE

LOWER SHAFT BUSHING
(FRONT)

SHUTTLE RACE

SETSCREW "B"
(2 PCS.)

HOLES IN THE
REAR COVER