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TM 9-2320-312-10
OPERATION UNDER UNUSUAL CONDITIONS - CONTINUED
0006 00
OPERATE IN EXTREME COLD
General.
1.
NOTE
Refer to FM 9-207 for additional information.
a.
Extreme cold causes many problems:
(1) Lubricants thicken or congeal.
(2) Batteries may freeze or lose their electrical efficiency.
(3) Fuel may not readily atomize for combustion.
(4) Various materials become hard, brittle, and easily damaged.
(5) Cooling system requires adequate protection from extreme cold.
(6) Fuels, lubricants, and antifreeze compounds require special storage, handling, and use.
b.
A 50/50 mixture of antifreeze (Item 1, WP 0019 00) and water is used in cooling system to provide freeze protection
down to -34F (-37C). Below -34F (-37C), use a 60/40 mixture of antifreeze and water.
c.
An auxiliary arctic heater kit is provided as an AAL item (WP 0018 00) for all vehicles assigned to arctic regions
[below -25F (-32C)], to protect vehicle systems from freeze damage. The arctic heater enables easier starting by
providing engine block preheating. The system also provides for heating of transmission fluid. Refer to subpara-
graphs 2 and 3 for operation of arctic heater.
d.
When starting out:
(1) Be careful when you first start your vehicle. Allow engine time to warm up so that it idles smoothly.
(2) Start driving very slowly for about 100 yards (91.4 m). Be alert for signs that tires may have flat spots or that
one or more brakeshoes may be frozen and require preheating. Notify Unit Maintenance as required.
e.
Parking.
(1) If vehicle will be parked for a short period, park in a sheltered area out of wind. If shelter is not available,
park vehicle so it does not face into the wind.
(2) If vehicle will be parked for a long shutdown period, try to park on high ground and use planks or brush to
make a raised and relatively dry surface. Keep tires out of snow, water, ice, and mud, if possible.
(3) Clean snow, ice, and mud from vehicle as soon as possible after shutdown.
(4) If vehicle will be parked for a long period of time, have Unit Maintenance remove and store batteries. Fill
fuel tank to guard against condensation and drain any accumulated water from air reservoirs and fuel filter/
water separator.
(5) Ensure tires are properly inflated.
(6) Have Unit Maintenance check and service cooling system to ensure tractor is adequately protected against
extreme cold. Ensure transmission is in N (Neutral) position and vehicle tires are blocked.
Change 1

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