TM 55-2210-224-12
Section V. OPERATION UNDER UNUSUAL CONDITIONS
2-31. OPERATION IN EXTREME HEAT
Operation in extreme heat puts an added load on the cooling system and necessitates special
lubrication and battery care procedures.
a. Lubrication. Refer to LO 55-2210-224-12 for proper grade of lubrication.
b. Cooling System.
(1) Check coolant level more frequently. Make sure the fan is operational and no debris clogs radiator.
(2) Check radiator hoses for signs of deterioration. Make sure there are no leaks around hose clamps or
drain plugs.
(3) Check radiator for leaks.
(4) During operation, check temperature gage frequently for signs of overheating (above 195°F [91°C]).
c. Batteries. Water in storage batteries evaporates rapidly in high temperature. Have unit maintenance personnel
check batteries frequently and replenish with distilled water (item 4, app E).
2-32. OPERATION IN EXTREME COLD
a. Lubrication. Refer to LO 55-2210-224-12 for proper grade of lubrication.
b. Cooling System.
(1) Have unit maintenance personnel check coolant to see that the proper protection is afforded for the
lowest possible temperature anticipated.
(2) Check radiator hoses for signs of deterioration. Make sure there are no leaks around hose clamps or
drain plugs. Check radiator for leaks.
c. Fuel Tank. Drain fuel tank daily as follows:
(1) Open drain valve in bottom of fuel tank.
(2) Allow water and sediment to drain into a container.
(3) Close drain valve.
(4) Wipe up spills.
(5) After operation, fill tank.
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