TM-9-2350-274-BD
M109/M110/M578 VEHICLES HOWITZER, MEDIUM, SELF-PROPELLED FULL-TRACKED
TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1984
TM-9-2350-274-BD - Page 98 of 219
TM 9-2350-274-BD
ELECTRICAL SYSTEM
6-6. BRUSHES GUMMED
General Information
Slip ring brushes gummed. Most alcohol based solvents are good cleaning agents and
will restore electrical or mechanical continuity on all types of contacts. On the M 109
with serial numbers below 1122, there are three contact arm assemblies. Serial
numbers above 1122 have five contact arm assemblies.
Limitations:
●
None
Personnel/Time Required:
●
1 soldier
●
30-60 minutes
Materials/Tools:
●
Cleaning solvent
●
Diesel fuel
Procedural Steps:
1.
Traverse the cab until the slip ring
contact arm assembly (item 2) to be cleaned
is at the rear of the vehicle.
2.
Turn vehicle MASTER switch off or
disconnect battery cables.
3.
Spray a small amount of diesel fuel
or other solvent, such as contact RE-NU,
onto the surface of the brushes. Work
the spray from top to bottom allowing
the force of the spray to flush away
the gum or dirt.
4.
Repeat step 3 to clean slip ring
segment board (item 1).
5. Record the BDAR action taken. When
mission is completed, as soon as practicable,
repair vehicle using standard maintenance
procedures.
6-6
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