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 3--23 3--5 HULL MAINTENANCE PROCEDURES — CONTINUED 3--5.5 Adjusting Track Tension a. Checking Track Tension 1 Move vehicle forward and backward several times on level ground, stopping by shifting transmission shift control lever to “N” (neutral) and coasting to a stop without applying the brakes. 2 Turn off engine. 3 Measure the distance between top of the third road wheel (1) and the track (2). The distance should be 1/4 inch (6.3 mm) to 3/8 inch (9.6 mm). If not, adjust track tension.