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 2-12 PREPARATION FOR FIRING — CONTINUED 2-12.4 Pre-Fire Checks a. Recoil System 1 Pins (1) on recuperator assembly (2) must not extend more than 3/4 inch (19.05 mm) or less than 1/8 inch (3.2 mm). 2 Recuperator assembly (2) slotted nut (3) and cotter pin (4) must be properly installed. 3 Variable recoil assembly (5) round nut (6) must be properly installed. NOTE Due to heat expansion, pressure may increase during normal firing. Safe to fire range is 17 to 50 psi (117 to 345 kPa). 4 Check replenisher accumulator assembly (6.1) pressure gage (6.2) for 17 to 24 psi (117 to 165 kPa). Change 2 2-199