WHEN MACHINE IS NOISY

CHECK:

Excessive end play in hook driving shaft.

Throat plate incorrectly seated.

Excessive end play in horizontal arm shaft.

Feed dog striking slots in throat plate.

Excessive end play in feed shafts.

 

 

WHEN THREAD SNAGGING, SKIPPED STITCHES OR OTHER THREAD HANDLING DIFFICULTIES OCCUR

CHECK:

Position of hook to or from needle.

Correct pressure and tension settings.
Needle bar height.
Hook timing.

 

WHEN MACHINE RUNS SLUGGISH

CHECK:

Machine may need cleaning and lubricating.

Horizontal arm shaft or hook shaft binding.
Binding in other points.

WHEN NEEDLE STRIKES PRESSER FOOT

CHECK:

Needle bar height.

Correct seating of needle in needle bar.

Correct seating of presser foot on presser bar.

Presser bar height.

Bent needle.

 

 

WHEN NEEDLE STRIKES SEWING HOOK

CHECK:

Correct seating of needle in needle bar.

Bent needle or needle bar.

Hook timing.

Loose needle clamping screw.

Excessive end play in hook driving shaft.