JUKI MO-2500 - Irregular Stitch Troubleshooting; Excessive Looper Thread Bulging; Looper Thread Bite Issues; Incorrect Knotting Position

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Trouble Case (1) Case (2) Check and Corrective measures
10. Irregular stitches 10-1) Looper thread tension 1-A) The upper and lower looper thread ten-
sions are not enough.
Slightly increase the upper and lower looper thread tensions.
The knotting position of the upper and lower looper threads varies as shown below.
10-2) Knife width 2-A) The knife width is unsuited for the over-
edging width.
Make the overedging width slightly smaller than that given for the knife width.
10-3) Thread path 3-A) Scratches on the thread path catch
thread.
Check the thread path for scratches.
3-B) The thread path parts have become
loose (instable).
Fix them with adhesive agent.
3-C) The looper pipe is not securely inserted. Insert the looper pipe until it will go no further.
10-4) Presser foot 4-A) The presser foot cones into contact
unevenly with the throat plate and feed dogs and tends to meander.
Make the presser foot come into contact with them evenly.
10-5) Thread stand 5-A) Thread dose not come out smoothly. Make the thread come out smoothly.
11. The looper thread bulges out 11-1) Knife width 1-A) The knife width is too small for the over-
edging width.
Use a knife having width suited to the overedg- ing width.
11-2) Looper thread take-up
adjustment
2-A) The looper thread take-up draws out
excessive looper thread.
Decrease the radius of the looper thread take- up (left) (reduction in dimension I). Raise the looper thread take-up (right) (increase in dis- tance O).
12. Looper thread bite 12-1) Knife width 1-A) The knife width is too large for the over-
edging width.
Use a knife having width suited to the overedg- ing width.
13. Knotting position is not correct 13-1) Threading 1-A) Re-threading after thread breakage, etc.
has been done erroneously.
Refer to the threading diagram. (Refer to the Instruction Manual)
Knots are deected to the upper looper side.
Right side