TM 55-1930-209-14&P-21Section II. Operation Under Unusual Conditions2-7Operation in extreme cold (below O°F)a.General. At extremely low temperatures, lubricants used for normal temperatures stiffen and lose much of theirlubricating effect. Metals become more brittle and lose some of their ability to withstand shock. Engine coolant requiresspecial attention. Batteries and wiring are also adversely affected by extreme cold.b.Lubrication. Refer to the lubrication chart (Fig. 3-1) and lubricate. Change the lubricants as indicated forspecific temperature ranges shown in Fig. 3-1, 4 of 4.c.Operational Precautions. Avoid all unnecessary shock loads when operating winch. Take up all cable slack andincrease tension on cables gradually to avoid sudden stress.d.Engine Coolant(1)Refer to Table 2-1 and add necessary anti-freeze mixture to engine cooling system.(2)Check coolant frequently to make sure there is sufficient anti-freeze.e.Fuel Tank. Keep fuel tank as full as possible at all times to prevent condensation of moisture in tank. Be sure touse proper grade of fuel.f.Electrical Wiring. Disturb electrical wiring as little as possible to keep it from becoming brittle.g.Battery(1)Inspect cables and battery for damage. Clean battery and cables as necessary and make sure batteryterminals are clean and tight.(2)Make sure battery filler cap vent holes are open. Keep electrolyte level 3/8 in. above battery plates.(3)To prevent battery from freezing, keep fully charged.2-8 Operation in extreme heata.Cooling System(1)Inspect engine coolant level frequently and maintain proper level. Avoid using water that containssubstances likely to cause rust or scale.(2)Make sure all "V" belts are properly adjusted.b.Lubrication. Refer to lubrication chart (Fig. 3-1) and lubricate unit more frequently. Clean any oil or foreignmatter from exterior of engine and winch.Table 2-1. Anti-freeze Mixture2-7
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