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Page Title: Section V. ELECTRICAL MOTORS
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TM  9-2320-356-BD Section   V. ELECTRICAL MOTORS 8-15.  GENERAL Repair   on   automotive   motors   should   be   restricted   to   relays,   solenoids,   and brushes. Damage   to   casings   and   windings   cannot   be   expediently   repaired. 8-16. ELECTRICAL  ALTERNATOR/MOTOR  BRUSH  WORN General   Information: Electrical   motors   and   alternators   use   a   carbon   composition   brush   to   transfer electrical   energy   to   or   from   the   armature   commutators. The   transfer   of   energy creates   an   electrical   arc   which   will   burn   the   brushes. Arcing   and   normal   friction will   cause   the   brushes   to   become   worn   and   inefficient   for   electrical   power transfer. The   brushes   can   be   substituted   with   the   carbon   core   from   a   BA30   or   BA31 flashlight    battery. Care   must   be   taken   when   opening   the   battery;   the   contents   are corrosive. Brush   retaining   springs   can   be   used   to   transfer   the   energy   or   to   hold the   old   brush   wires   in   place. Limitations: o   Shorter   motor/alternator   life Personnel/Time   Required: o    1    to    3    soldiers o   1   to   8   hours Other   Options: o   Modify   and   use   other   electrical   brush   sets. Procedural    Steps: 1. Gain   access   to   motor   or   alternator. 2. Remove   electrical   brush   plate. 3. Obtain   a   BA30   or   BA31   battery. Materials/Tools: o   BA30   or   BA31   battery o   Hacksaw o   Sandpaper WARNING The   fibrous   material   of   a   battery   is   corrosive and   could   cause   injury   to   eyes   and   damage   to clothing. 4. Use   a   hacksaw   or   other   available   tool   and   split   the   battery   open,   taking   care not   to   damage   the   carbon   core. 5. Clean   and   cut   the   carbon   core   to   fit   the   brush   plate   receptacles. 8-16

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