Extracting a solution.Dear Half-Mast, We're currently going through gunnery and have had some problems with one oF our M1A1 tanks. When the tank fires, the breechblock doesn't drop to allow the aft cap to be ejected from the chamber. Since we have to manually extract the aft cap, there's the additional worry about unburnt propellant pro·pel·lant also pro·pel·lent n. 1. Something, such as an explosive charge or a rocket fuel, that propels or provides thrust. 2. and gasses causing flashback flash·back n. 1. An unexpected recurrence of the effects of a hallucinogenic drug long after its original use. 2. A recurring, intensely vivid mental image of a past traumatic experience. in the turret. We've cleaned and lubed the breech breech (brech) the buttocks. breech n. The lower rear portion of the human trunk; the buttocks. breech, britch the buttocks of an animal; the backs of the thighs. well. The tank seems to tire and recoil recoil /re·coil/ (re´koil) a quick pulling back. elastic recoil the ability of a stretched object or organ, such as the bladder, to return to its resting position. with no problems. Any idea what could De causing the situation? CW3 J.N. Dear CW3 J.H., From what you've said, it sounds like you may need to adjust the cam bracket operation cable. If the cable is too far out of adjustment, the crank boss misses engagement with the cam bracket during the counter-recoil stroke. That's what mechanically cycles the breech open so the extractors can expel ex·pel tr.v. ex·pelled, ex·pel·ling, ex·pels 1. To force or drive out: expel an invader. 2. the aft cap. The adjustment procedures for the cam bracket operation cable start on Page 8-70 of TM 9-2350-264-20-2-4 (Apr 03), Page 8-55 of TM 9-2350-288-20-2-4 (Aug 95), and Page 8-61 of TM 9-2350-388-20-2-4 (Feb 01). If the ejection ejection /ejec·tion/ (e-jek´shun) 1. the act of casting out or the state of being cast out, as of excretions, secretions, or other bodily fluids. 2. something cast out. 3. problem still exists after you adjust the cable, take a look at the extractors themselves. There is a small lip machined on the upper inside edge of each extractor. These lips ate what grab the aft cap and extract it. If they wear down or break, they won't grab like they should. I'd also suggest that you manually exercise the mount. Use the M-3 oil pump and get the mount out far enough that the lobe lobe (lob) 1. a more or less well-defined portion of an organ or gland. 2. one of the main divisions of a tooth crown. on the crank extends past the cam (about 10 inches). With the manual handle in the armed (down) position, you should be able to see the cam snap into position. Then you can let the mount back into battery and watch the breech operation. LOOKS LIKE YOU'VE STILL GOT THAT FLASHBACK PROBLEM! [ILLUSTRATION OMITTED] MAYBE MASTER SERGEANT HALF-MAST CAN HELP! [ILLUSTRATION OMITTED] THANKS FOR WRITING, SIR! [ILLUSTRATION OMITTED] |
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