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 Item No. 73.1 lnterval Monthly Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M109 SELF-PROPELLED HOWITZER Location Item to Check/ Service Muzzle Brake and Bore Evacuator Assembly Thrust Collar Setscrews Crewmember Procedure CHIEF OF SECTION Inspect setscrew (1) holding the ball and spring in place. This setscrew must be staked to prevent loosening which will cause the bore evacuator and muzzle brake thrust collar to rotate. If this screw is not staked, notify unit maintenance. NOTE Setscrew (2) is removable to provide an ac- cess to release the ball lock. It should not be staked. Not Fully Mission Capable If: Staked setscrew is missing. To inspect locking ball and spring, remove unstaked screw and insert screwdriver in hole. Push against lock ball to see if ball moves around freely. If ball moves freely and there’s no resistance from spring, notify unit maintenance. Separate main reservoir (3) and prereservoir (4) (para 3-6.7.1). Clean and lubricate three metering orifices (5), nine evacuator ball valves (6), 10 evac- uator holes (7), tube threads (8) and ring valve (9) (Appendix G). NOTE After installing setscrew (1) notify unit mainte- nance for torquing. Ring valve is bro- ken, cracked, or deformed. If three or more baIls are missing. Change 2 2-86.1