2. Engine Coolant Temperature Gauge The colored bands indicate the temperature of the engine coolant. WHITE ZONE ( ) - Indicates temperature is lower than the normal operating temperature. BLUE ZONE ( ) - Indicates temperature is within the normal operating range. C H RED ZONE ( ) - Indicates temperature is too high. During operation, the pointer must be in the blue zone. FG000041 Figure 37 If the gauge pointer moves into the red zone, the engine coolant temperature warning light will turn "ON," a warning buzzer will sound, and the engine speed will be automatically reduced. Allow the engine to run at low idle speed until the temperature gauge registers in the blue zone again.
When the blue zone is reached, allow the engine to idle for an additional three - five minutes before shutting down the engine. If not allowed to idle, heat surge may develop which will damage the engine. Allowing the engine to idle will dissipate heat. Check the coolant level, look for a loose fan belt, inspect for debris around radiator, and so on. When the temperature reaches the normal range, the engine speed will automatically recover. 3. Hydraulic Oil Temperature Gauge The colored bands indicate the temperature of the hydraulic oil WHITE ZONE ( ) - Indicates temperature is lower than the normal operating temperature.
BLUE ZONE ( ) - Indicates temperature is within the normal operating range. C H RED ZONE ( ) - Indicates temperature is too high. FG000042 Figure 38 During operation, the pointer must be in the blue zone. If the gauge pointer moves into the red zone, the hydraulic oil temperature symbol will turn "ON," and be display in the screen. Allow the engine to run at low idle speed until temperature gauge registers in the blue zone again. NOTE: See “Abnormal State Warning Symbols” on page 2-27, for location of this warning symbol and others. OP001760 2-21 Operating Controls