Operator Troubleshooting continued.
TEST OR INSPECTION
CLOTHING SEWING MACHINE
Step 2. Check that thread is not caught in spool notch or wrapped around spool spindle.
Clear the wrap-around thread from spindle if necessary and rethread machine (para 2-11c).
If notch is burred or damaged, notify next higher level of maintenance.
Step 3. Check for rough or burred places on thread guides, presser foot, or throat plate hole. If rough
or burred places are found, notify next higher level of maintenance.
Step 4. Check for bent needle, blunted needle point, or burred needle eye. Discard bent or blunted
needle and replace with a new needle of correct size, class and variety (paras. 2-11a and 2-
Step 5. Check that the needle is all the way up in needle bar and the needle bar is tight. Insert
needle all the way up into needle bar and tighten needle bar clamp (para 2-11b).
Step 6. Check for sharp, rough or burred edges on shuttle hook, bobbin case, or tension controls.
If defective parts are found, notify next higher level of maintenance.
Step 7. Check thread size against needle size.
Be sure you have selected the right thread weight for the needle being used. It maybe too
If the wrong thread is being used, remove thread and rethread machine with the correct
Check that thread is left-twist thread. If thread is right-twist thread, remove thread and
replace with left-twist thread. Rethread machine (para. 2-11c).