TM-9-2350-274-BD M109 Battlefield Damage Assessment and Repair Download
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TM 9-2350-274-BD ARMAMENT AND FIRE CONTROL SYSTEM Procedural Steps (Cont): 4. Use acetylene torch to cut a patch from sheet metal 1/4 to 1/2-inch larger than damaged area (items A and D). 5. Shape patch to fit curve of bore evacuator. 6. Wire brush both mating surfaces. 7. Set and secure patch in place over damaged area. CAUTION If arc welding on turret, ground welding equipment to turret only, Parts of slipring and race bearings can be damaged from high currents conducted between hull and turret if welding equipment is not grounded correctly. 10-7