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.
Gaskets and seals are more likely to leak when engine and hydraulic system operating temperatures
are high. 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) 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. When warning lights have gone out, resume operation as necessary.
(4) Perform operator PMCS more often than normal (pages 2-7 through 2-26).
(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
Operation In Extreme Dust. The Roller normally operates in dusty conditions and PMCS instructions are
designed to handle these conditions. However, in deserts, dust conditions are more extreme and certain checks
and services shall be made more often than normal.
(1) Check air restriction indicator more often to ensure air cleaner is not becoming clogged.
(2) Check and drain fuel/water separator.
(3) Closely monitor all gauges and warning lights to ensure Roller is not affected by dusty conditions.
(4) Park Roller in sheltered area out of wind. If a sheltered area is not available, park Roller facing into
wind to prevent dust from blowing into radiator and causing damage.