TM 9-2320-209-10-1 1. 2. 3. WARNING Trucks described in this manual are equipped with a low air pressure buzzer system. Do not place vehicle in motion until buzzer stops and AIR pressure gage (1) shows at least 65 psi. Air brakes may not function properly when air pressure is low. Check AIR pressure gage (1) . It should show 65 psi. If it does not show between 65 and 120 psi, stop engine and tell organizational maintenance. Check air filter indicator (2) . It should not show red. If indicator shows red, stop engine. Check temperature gage (3) . It should show between 180°F and 200°F when engine is at normal operating temperature. If engine temperature rises sharply to 21O°F or more, or if temperature stays below 160ºF, stop engine. 4-40