TM 5-4310-343-35
Trouble
Probable cause
Remedy
Eccentric or high mica on
Grind and true commutator.
Under-
commutator.
current mica (para 5-6.4).
Weak or broken brush springs.
Check brush springs and verify
correct brush pressure. (para 4-4).
Brushes too short.
Replace brushes (para 4-5).
Brush chatter or hissing noise.
Loose brushes, insufficient brush
Check for worn brushes and
spring tension
correct. brush pressure -(para 4-4).
High mica.
Undercut mica (para 5-6.4).
Poor brush fit on commutator
Reset brush (para 4-5).
Brushes binding in the brush
Remove and lea brush holders.
holders.
Remove my irregularities on inside
surface of brush holder or brush.
Brushes wear rapidly.
Rough commutator.
Resurface commutator and
undercut mica (para 6-4).
Armature overheats.
Defective armature winding.
Check commutator for internal
shorts. Remove any metallic
particles (para 6-4).
Excessive vibration.
Defective bearings.
Check bearing for defects
Replace defective
bearing
4-8A
