TM-9-2350-358-BD
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6
TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE
MARCH 1994
TM-9-2350-358-BD - Page 168 of 343
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
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