Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-20. OPERATION IN UNUSUAL WEATHER.
The Mixer, Rotary Tiller usually operates under conditions that are generally UNUSUAL for other vehicles.
Operator PMCS instructions are designed to cover these conditions. However, operation in extreme heat or cold
requires additional checks and services. The following paragraphs cover these conditions.
2-21. OPERATION IN EXTREME HEAT.
Operating during periods of extreme heat [ambient temperatures above 100°F (38°C)] can cause the
vehicle engine and hydraulic systems to overheat. Engine temperatures above 230°F (110°C) and
hydraulic fluid temperatures above 250°F (121°C) can cause damage to engine and hydraulic system
components. Coolant and hydraulic fluid temperatures should be checked often during periods of
extreme heat to prevent damage to engine and hydraulic system components.
Gaskets and seals are more likely to leak when engine and hydraulic system operating temperatures
are high. Engine and hydraulic fluid levels should be checked more often during periods of extreme
heat to prevent damage to engine and hydraulic system components. Checks for leaks around
gaskets, seals, and fittings should also be made more often.
Check engine oil level (para 3-6) and operating temperature often for system temperature above 230°F (110°C).
b. Check hydraulic fluid level (para 3-11) and operating temperature for system temperature above 250°F (121°C).
c. Check cooling system often.
(1) Check coolant temperature gauge for engine operating temperature above 230°F (110°C).
(2) Check that coolant level is not below minimum (para 3-7).
(3) If conditions described in steps (I) and (2) exist, set transmission control lever to IDLE position and 2-
speed lever to NEUTRAL position.
(4) Allow engine to run at idle for a few minutes to cool down.
(5) When system temperatures have returned to a safe range, resume operation as necessary.
d. Extreme heat will cause tire pressure to increase. Check tire pressure often.