OPERATION IN EXTREME HEAT
During very hot weather, operating procedures may need to be altered to prevent machine
overheating. Avoid continuous high engine RPM. Failure to follow this caution may result
in damage to equipment.
Refer to FM 90-3, Desert Operations.
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
Wear effective eye, hand, and skin protection when handling coolants.
Failure to follow these warnings may result in injury to personnel.
1. Check coolant level in coolant overflow tank. Coolant mixture must be 50% ethylene glycol and 50% water. If
necessary, add coolant to correct level (WP 0020).
2. With engine cold, check radiator cap for damage and wear before hot conditions begin. Replace cap if neces-
3. Be sure radiator is free of bugs, dust, and other foreign matter.
4. Visually check belt tension frequently. Report any damaged or loose belts to Field Maintenance.
5. Press belts (Figure 5, Item 1) with finger; if belts deflect more than half an inch, notify Field Maintenance.
Figure 5. Checking Belt Tension.