T-8421C, 8422C, 8452C, 8722C, 8752C
13. STANDARD ADJUSTMENT
68
13-5. Clearance between rotary hook and opener
1. Loosen the set screw (3) and move the opener (1) to the
left or right to adjust so that the clearance between the
rotary hook (2) and the opener (1) is 0.1–0.3 mm when
the opener (1) is pulled as far as it will go in the direction
of the arrow.
2. Tighten the set screw (3).
NOTE:
If the clearance is too large
• Upper thread trimming errors may occur (models with
thread trimmer).
• The right upper thread may be cut too short (models with
thread trimmer).
If the clearance is too small
• The rotary hook may become damaged.
• The opener (1) may become damaged.
13-6. Presser foot height
1. Remove the rear cover (1) and remove the rubber cap (2).
2. Loosen the nut (3) and loosen the presser adjusting screw
(4).
3. Use the lifting lever (5) to raise the presser foot (6).
4. Loosen the screw (7) and move the presser bar (8) up or
down to adjust so that the presser foot (6) is
approximately 7 mm above the top of the needle plate.
NOTE:
Do not turn the presser bar (8) at this time.
5. Tighten the screw (7).
6. Turn the presser adjusting screw (4) to adjust the presser
foot pressure, and then tighten the nut (3).
2477B
2206B
3059M
Approx. 7mm
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