Section II. OPERATION UNDER UNUSUAL CONDITIONS
3-7. UNUSUAL ENVIRONMENT AND WEATHER
Operation in Extreme Heat.
Operating during periods of extreme heat (ambient temperatures above 100°F [38°C]) can
cause the Roller engine and hydraulic systems to overheat. Engine temperatures above 230°F
(110°C) and hydraulic oil temperatures above 250°F (121°C) can cause damage to engine and
hydraulic system components. Check engine coolant temperature warning light and
hydraulic oil temperature warning light often during periods of extreme heat to prevent
damage to engine and hydraulic components.
Check engine and hydraulic oil levels more often during periods of extreme heat to prevent
damage to engine and hydraulic system components. Check for leaks around gaskets, seals,
and fittings more often.
(1) Check engine oil level and monitor engine coolant temperature warning light.
(2) Check hydraulic oil level and monitor hydraulic oil temperature warning light.
(3) Check cooling system often.
(a) Monitor coolant temperature warning light.
(b) If conditions described in Steps (1) and (2) exist, stop Roller and allow engine to run at idle for a
few minutes to cool down.
(c) When warning lights have gone out, resume operation as necessary.
(4) Perform operator PMCS more often than normal (pages 2-7 through 2-28).
(5) Do not fill fuel tank completely. Extreme heat will cause fuel to expand and overflow.
(6) Ensure that water is free as possible of mineral deposits before adding coolant mixture to radiator.
Local desert water sources have high mineral deposits that will clog radiator.
(7) Ensure that water/antifreeze mixture is 50/50. This mixture raises the coolant boiling point to help
(8) High temperatures can damage hoses. Check radiator, fuel, and lubricant hoses for leaks around
fittings and notify Unit Maintenance to replace all damaged hoses.