TM-9-2350-358-BD M109A6 Battlefield Damage Assessment and Repair Download
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TM 9-2350-358-BD 7-7. BRUSH, ELECTRIC, MOTOR/GENERATOR, WORN General Information: Electrical motors and generators use a carbon composition brush to transfer electrical energy to or from the armature commutators. The transfer of energy creates an electrical arc which gradually burns 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 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: Shorter generator/motor life Personnel/Time Required: • 1 or 2 soldiers • 1-8 hours Materials/Tools: • BA30 or BA31 battery (scavenge from available source) • Hacksaw (found in M2/3 generic BDR kit, Section III, Appendix C) • Paper, abrasive (item 46, Appendix C) References: • TM 9-2350-314-10 • TM 9-2350-314-20-1-2 Other Options: Modify and use other electrical brush sets. Procedural Steps: 1. Gain access to generator. 2. Set MASTER power switch to OFF. 3. Remove electrical brush holder. 4. Obtain BA30 or BA31 battery (flashlight, "D" cell or "C" cell battery) WARNING Battery acid is very caustic and corrosive and when in contact with skin or eyes can cause severe bums and blindness. Always wear protective clothing and safety goggles when working around batteries. If battery acid does come in contact with eyes or skin, rinse thoroughly with clear water and seek medical aid. NOTE In the following steps exercise extreme care to avoid damaging the carbon core. 7-8