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 e. Cold Weather Starting (Vehicles with LHR Engine Model 7083-7391) — Continued 9 10 11 12 13 14 Manual override of the engine glow plug controller is accomplished by holding the GLOW PLUGS switch (19) for 35 seconds. Continue holding GLOW PLUGS switch and engage STARTER control switch (14). When engine starts, hold GLOW PLUGS switch on until engine speed reaches 1500 rpm. If engine fails to start after four attempts (M109A2/M109A3 howitzers) discontinue starting attempts and notify unit maintenance. For M109A4/M109A5 howitzers, proceed to step 10. If engine in M109A4 or M109A5 howitzer does not start, repeat step 9 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. With brakes still locked, set hand throttle control lever (17) to run engine at 1200 rpm and shift transmission shift control lever (9) to 4 (4th gear) position. When engine WATER TEMP gage (18) indicates 120 to 140° F, shift into N (neutral) and idle engine. (If transmission temperature approaches 300° F during warm-up, immediately shift to N (neutral), until temperature approaches normal range). During warm-up, refer to portable instrument panel checkout procedure (para 2–10.2). Press down on brake pedal (7) and lift up and push in on manual control handle (8) to release parking brake. Shift transmission shift control lever (9) to 1 (1st gear) position and drive vehicle slowly 100 yards (91.4 m), being careful not to stall engine. This warms lubricants sufficiently for normal operation. 2-284