TM-9-2350-311-10

TM 9-2350-311-10

2-20 OPERATION IN UNUSUAL

2-20.4

d. Cold

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.

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