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 2–20 OPERATION IN UNUSUAL ENVIRONMENT/WEATHER — CONTINUED 2-20.4 Operation in Extreme Cold — Continued d. Cold Weather Starting (Vehicles with Engine Model 7083-7396) — Continued Combat override switch in M109A4 and M109A5 howitzers should be used in emergencies only, as determined by section chief. STARTER control switch must never be engaged for more than 2 minutes at a time. Do not make more than two attempts to start engine using combat override switch as damage to starter or low battery voltage may occur. NOTE • To assist in starting, hand throttle control lever setting may be increased 1/8 travel when engine speed exceeds 500 rpm. • If engine does not start after 2 minutes of cranking, wait at least 2 minutes before trying to start again. If engine does not start after two tries, stop starting procedure and notify unit maintenance. • If engine does not reach 100 rpm or more after 15 seconds, notify unit maintenance. 8 If engine in M109A4 or M109A5 howitzer does not start, repeat step 7 while engaging both STARTER control switch (14) and combat override switch (16). If engine does not start after two attempts, stop starting procedures and notify unit maintenance. 2-278