TM 10-3530-207-14
Table 3-1. Operator troubleshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CLOTHING SEWING MACHINE
22.
UNUSUAL NOISE IN MOTOR.
Motor may be defective.
Turn off machine and notify next higher level of maintenance.
23.
MOTOR DOES NOT PULL LOAD.
Step 1. Check to see if motor to sewing machine drive belt is loose, slipping, frayed, or
deteriorated.
Turn off motor and adjust and/or replace belt. (para. 3-10).
Step 2. Input voltage to motor may be low or motor may be faulty.
Turn off motor and notify next higher level of maintenance.
DARNING SEWING MACHINE
24.
NEEDLE BREAKS.
Step 1. Needle might have become bent or blunted and hit presser foot.
Replace broken needle with new needle of correct size, class, and variety (paras
. 2-12a
and 2-12b).
Step 2. Needle may have had a burr on the point or the eye may have become very dirty.
Replace broken needle with new needle of correct size, class, and variety (paras
. 2-12a
and 2-12b).
Step 3. Needle may have been too fine (wrong size, class, and variety) for thefabric being darned
or the job being done.
Replace broken needle. Be sure it is of the correct size, class, and variety for the
fabric being worked and the job to be done (paras
. 2-12a and 2-12b).
Step 4. You may have installed the needle incorrectly.
Replace broken needle with new needle of correct size, class, and variety (paras
. 2-12a
and 2-12b). Be sure needle is inserted into the needle bar correctly.
3-20
