OPERATION IN EXTREME HEAT
During very hot weather, operating procedures may require altering to prevent machine
overheating. Avoid continuous high engine RPM.
Refer to FM 90-3, Desert Operations.
1. Driving Machine.
a. Keep a close eye on machine alert indicators and coolant, transmission, and hydraulic temperature
b. If alert indicators signal an alert or if a temperature gauge reads unusually high, stop and perform
If indicators stay on after more than 10 minutes of reduced workload, stop machine and notify Field
2. Cooling System.
DO NOT service cooling system unless engine has cooled. This is a pressurized cooling
system and escaping steam or hot coolant will cause serious burns.
DO NOT remove cooling system radiator cap when engine is hot. Allow engine to cool
down. Loosen cap to first stop and let any pressure out of cooling system, then remove
cap. Failure to follow this warning may cause serious burns.
Wear effective eye, glove, and skin protection when handling coolants. Failure to follow
this warning may cause injury to personnel.
a. Check coolant level at frequent intervals and keep radiator cap tight. Add coolant, if necessary (WP 0013).
b. Be sure radiator is free of bugs, dust, and other foreign matter.
Report a damaged or loose belt to Field Maintenance (WP 0018).
a. Use correct lubricants as specified (WP 0013) with the temperature range that applies to the highest
expected ambient temperature.
b. Notify Field Maintenance to shorten differential and final drive oil change interval.