TM-9-2350-274-BD M109 Battlefield Damage Assessment and Repair Download
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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