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11. ADJUSTMENT
116
KE-430F, BE-438F
11-17. Adjusting the backlash amount (play) of the lower shaft gear
1. Tilt back the machine head.
2. Open the shuttle race base cover.
3. Remove the shuttle race base, shuttle hook and bobbin
case.
4. Remove the two screws (with washer) (1), and then
remove grease holder F (2).
5. Remove the two rubber caps (3).
6. Loosen the two set screws (4) and the two set screws (5).
7. Use the tip of a screwdriver or similar to adjust the front and back rock gear collars (6) so that the backlash amount (play)
is 0.05 to 0.2 mm.
* Alternately move the phase of the front and back rock gear collars (6) slightly to adjust so that the phase of the front
and back rock gear collars (6) is about the same (within ±10 degrees).
・ If the backlash amount (play) is small, it will result in wear in the rock gear (7) and the lower shaft gear (8).
・ If the backlash amount (play) is large, it will result in wear in the rock gear (7) and the lower shaft gear (8) and also
result in increased noise during sewing.
8. First tighten the two set screws (4), and then tighten the two set screws (5).
9. Recheck that the backlash amount (play) which was adjusted in step 7 above is correct.
10. Install any parts which were removed from step 5 onward by carrying out the removal procedure in reverse.
Backlash amount
becomes smaller
Backlash amount
becomes greater
2959B
2998B