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 Change 6 2--59/(2--60 blank) Table 2--1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M109 SELF-PROPELLED HOWITZER — CONTINUED Location Item No. Not Fully Mission Capable If: Crewmember Procedure Item to Check/ Service Interval 39 After Bore Evacuator CHIEF OF SECTION NOTE • Some rotation of the bore evacuator is acceptable. However, if it rotates more than 1 inch (2.54 cm), check to ensure setscrew locks bearing ball. Notify unit maintenance if problem persists. • Do not fill metering holes with grease. Filling of the holes will decrease efficiency of the bore evacuator. Clean evacuation orifices and ensure that bottom setscrew (not shown) is staked. Staked setscrew, ball or spring is missing. Inspect valve ring (1) for cracks or deformation. Valve ring (1) is broken. Clean cannon tube (2) threads. NOTE Notify unit maintenance if valve ring is cracked or deformed, or if threads are burred or damaged. After firing, remove setscrew (3) from bore evacua- tor (4). Insert T-handle into setscrew hole. Turn T- handle to engage with threads. Continue turning to depress bearing ball and spring (not shown). Insert pry bar into hole (5). With bearing ball (not shown) depressed, unscrew bore evacuator and slide it forward. Slide valve ring (1) forward and 10 check balls (6) should fall out. Thoroughly clean check balls and three metering holes (7). Apply a light coat of grease (item 19, Appx D) or grease (item 18, Appx D) to bearing balls, valve ring, and un- painted cannon tube surfaces before reassembling. Three or more check balls are missing. 4 2 5 3 1 6 7