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 2-12.3 Standard Angle Method a. Determining the Standard Angle NOTE When performing fire control alinement tests and measurements, ensure the gun trunnions are leveled using the plumbline method (para 3-7.3) and that the M1451M145A1 telescope mount is scribed (para 3-7.9). 1 Perform fire control alinement tests and measurements (para 3-7). 2 Inspect recuperator assembly pins (1) to ensure that the recoil system contains the proper amount of hydraulic fluid (item 12, Appx G). NOTE The scribe line at the junction of the variable recoil cylinder and the machine bushing verifies that the recoiling and non-recoiling parts of the howitzer have the same relationship as when the standard angle was determined during fire control alinement tests. 3 Scribe a line at the junction of the variable recoil cylinder (2) and the machine bushing (3). Change 2 2-193