TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9-2350-311-10 Interval Before Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M109 SELF-PROPELLED HOWITZER — CONTINUED Location Item to Check/ Service Breechblock Crewmember Procedure CANNONEER NO. 1 • • Never forget to put operating handle back to stow position. If left down while closing breechblock, it can cause serious injury to per- sonnel. Make it a practice never to let go of handle until you return it to stowed position. If breechblock is not closed completely, do not attempt firing, as it may result in death or inju- ry to crew. To prevent damage to follower assembly, firing mechanism must be in firing position before breechblock is opened manually. a. Before firing, open and close breechblock (1) to be sure it operates freely and smoothly and wit- ness marks (2) aline. If breechblock or breech ring threads (3) are burred and prevent smooth operation, notify unit maintenance. Not Fully Mission Capable If: Breechblock (1) will not close completely (wit- ness marks (2) on breech ring (4) do not aline with witness marks on breech- block). Operating handle (5) does not work or breech mecha- nism is seized. 2-36