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 2-20.4 d. Cold 3 4 5 6 7 ENVIRONMENT/WEATHER — CONTINUED Operation in Extreme Cold — Continued Weather Starting (Vehicles with Engine Model 7083-7396) — Continued Depress brake pedal (7) and pull out and down on manual control handle (8) to engage parking brake. Shift transmission shift control lever (9) into N (neutral) position. Turn MASTER switch (10) to ON and MASTER switch indicator light (11) will illuminate. Turn FUEL PRIME control switch (12) to ON and hold for 45 seconds, then release. Do not engage STARTER control switch for more than 2 minutes at a time (for M109A2 and M109A3 models this must be timed; it is an automatic function in the M109A4 and M109A5 models). If engine speed does not reach 100 rpm after 15 seconds, release STARTER control switch and notify unit maintenance. NOTE • FLAME HEATER switch must be activated while starter is engaged. • M109A4 and M109A5 howitzers have a starter protection device in the engine compartment which will disengage starter automatically. The starter in all models must be disengaged after 60 seconds in temperatures between 0 and 50° F (–18 and 10° C) and after 120 seconds in temperatures below 0° F (–18° C). This will allow a 2 minute cooling off period between starting attempts. If engine (in M109A4 or M109A5) does not start using starter switch, proceed to step 8. Pull FUEL SHUT OFF control assembly handle (13) out (off position) and hold. Engage STARTER control switch (14) and FLAME HEATER control switch (15), and crank engine for 15 seconds. Release FUEL SHUT OFF control assembly handle. Continue cranking engine and begin cycling FLAME HEATER control switch, on 1 second and off 1 second. When engine speed exceeds 300 rpm, release FLAME HEATER control switch. Continue to engage STARTER control switch until engine speed reaches 500 rpm. 2-276