JUKI APW-895, Engineer'S Manual

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Trouble Cause (1) Cause (2) Check and corrective measures
4. Defective thread tension 4-1) Deficient tension of the Increase the needle thread tension.
needle thread (Refer to the description of thread tension.)
4-2) Maladjustment of thread 2-A) The tension of the thread Increase the tension of the thread take-up spring.
take-up spring take-up spring is deficient. (Refer to the description of thread tension.)
2-B) Deficient stroke of the thread Adjust the stroke of the thread take-up spring to the
take-up spring appropriate level. (Refer to the description of thread
tension.)
4-3) Inappropriate clearance between Adjust the clearance to 0.2 to 0.3 mm.
the opener and inner hook (Refer to the description of opener adjustment.)
4-4) Excessive clearance between Adjust the binder lowering position.
the sewing table and binder (Refer to adjustment of the binder levelness.)
5.Needle breakage 5-1) Interference between the needle Adjust the clearance between the needle and the blade
and the blade point of the hook point of the hook. (Refer to adjustment of the hook
and needle.)
5-2) Excessive contact between Adjust the timing between the needle and hook.
the needle and needle guide (Refer to adjustment of the hook and needle.)
5-3) Interference between the Adjust the position of the needle bar rocking base.
needle and the throat plate (Refer to alignment of the needle bar rocking base
or needle hole in the front-rear direction.)
5-4) Interference between the 4-A) Interference with the binder Adjust the binder position.
needle and each device (Refer to adjustment of the binder mechanism.)
4-B) Interference with the folding Adjust the position of the folding plate.
plate (Refer to adjustment of the clamp foot mechanism.)
5-5) Inappropriate lock stitch sewing Adjust the stitch length to 2.0 mm.
speed
5-6) Too thin needle for the material Use a 1-count thicker needle.