OPERATOR'S STATION Air Filter Restriction Indicator (Red) If the air cleaner element becomes clogged,, the air filter restriction indicator and the service indicator light. Immediately stop the engine and inspect the air cleaner element. Replace the element, if necessary. f NOTE: This indicator may unexpectedly light when the coolant temperature gauge indicates the center or lower position. It turns off automatically when the coolant temperature increases. M4GB-01-023 Preheat Indicator (Yellow) The engine is being preheated as long as the preheat indicator stays ON. When the preheat indicator goes OFF, engine preheating is completed. M4GB-01-031 1-16