TM 10-3530-207-14
Table 4-2. Unit Troubleshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CLOTHING SEWING MACHINE continued.
8.
NEEDLE BREAKS.
Check for loose presser foot.
If presser foot is loose, notify next higher level of maintenance.
9.
FEED DOGS STRIKE THROAT PLATE.
Check that throat plate is fully into position.
If throat plate is in the full in position, notify next higher level of maintenance.
10.
MACHINE VIBRATES.
Step 1.
Check that hinge plate mounting screws are tight.
If any screws are loose, tighten screws.
Step 2.
Check felt pads are installed in the table tops.
If all four felt pads are not located on table, install felt (para. 4-25).
Step 3.
Check for 1/2-inch deflection at mid-point of drive belt.
If drive belt is out of adjustment, adjust belt (para. 3-10).
Step 4.
Check for loose or damaged drive pulley or machine pulley.
Notify next higher level of maintenance if any of the above conditions exist.
11.
LAMP DOES NOT LIGHT.
Step 1.
Check that light bulb is broken.
If light bulb is broken, unplug power cord from outlet, remove old bulb and replace.
Step 2.
Unplug power cord from outlet and inspect for frayed or broken insulation and wires.
If cord is frayed or broken, replace lamp (para. 3-12).
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