TM 10-3530-207-14
Table 3-1. Operator troubleshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
DARNING SEWING MACHINE
37.
UNUSUAL NOISE IN MOTOR.
Motor may be defective.
Turn off motor and notify next higher level of maintenance.
38.
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, 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.
BUTTON SEWING MACHINE
39.
NEEDLE BREAKS.
Step 1. Needle may have been wrong size, class, and variety.Check needle size.
Replace broken needle with new needle of correct size, class, and variety (paras
. 2-
13a and 2-13b).
Step 2. Needle may have become bent or has a blunt point.
Replace broken needle with new needle of correct size, class, and variety (paras
. 2-
13a and 2-13b).
Step 3. Button was not aligned firmly and correctly in button clamp.
a.
Replace broken needle with new needle of correct size, class, and variety (paras
. 2-
13a and 2-13b).
b.
Align button firmly and correctly in button clamp (paras. 2-13e and 2-13f)..
Step 4. Make sure you are not stepping on motor starting treadle before lowering button clamp on
material firmly with button clamp treadle.
Be sure button clamp is firmly down on material before starting machine with motor
starting treadle.
3-28
