TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 384 of 775

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.

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