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PLATE 0876293 - Caterpillar

0876293 PLATE Caterpillar parts PLATE
Alternative (cross code) number:
Caterpillar 0876293 PLATE

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The DEF tank header is located in the DEF tank. The tank header consists of several parts and performs the following functions:Coolant TubesThe coolant supplied by the engine will flow through the tubes when the coolant diverter valve opens. Coolant runs along the pickup tube to the bottom of the tank and then spirals around the level sensor. The heat from the coolant will thaw any frozen DEF in the tank or header. The heat will also prevent the DEF from freezing around the pickup tube.DEF Pickup TubeThe DEF is pulled from the bottom of the tank through a screen.DEF Tank Header FilterAt the end of the DEF Pickup tube is a 100 micron filter to filter debris from entering the system.DEF ReturnThe DEF is returned back to the tank from the DEF injector.DEF Tank Temperature SensorAt the bottom of the tank header near the DEF tank header filter is a tank temperature sensor. The temperature sensor is a passive thermistor. The resistance of the thermistor varies with temperature. This sensor monitors the temperature of the DEF in the tank. This temperature is used to determine when to turn on the coolant diverter valve.DEF Quality SensorAt the bottom of the tank header next to the DEF tank header filter is the DEF quality sensor. The ultrasonic DEF quality sensor uses the speed of sound within a fluid to identify concentration of the fluid. This is achieved by measuring the time it takes for the emitted ultrasonic signal to be reflected off a known fixed reference point. Based on the chemical properties and temperature of the fluid, the sensor is able to detect urea concentration with an accuracy of up to 2 percent. If the sensor detects the quality of DEF is not within specifications, a fault code will trip indicating the DEF concentration is not correct. The engine may derate.There is a configuration parameter in the electronic service tool called "Aftertreatment #1 DEF Quality Sensor Installation Status" that must be programmed to "Installed". The parameter is factory password protected. The DEF tank header with the DEF quality sensor is a data link type sensor.Coolant Diverter Valve
Illustration 4 g03690330
Typical example
(1) Outlet connection
(2) Electrical connection
(3) Inlet connection
(4) Flow direction indicatorThe coolant diverter valve is mounted to the application. The coolant diverter valve is a normally closed valve. The valve is a unidirectional flow valve. The system is used to thaw the frozen DEF fluid in the DEF tank before dosing occurs. Warming the system is achieved by taking warm coolant from the engine and routing the coolant through the tank and DEF pump. The coolant diverter valve will open when the tank temperature needs to be increased. Once the DEF tank temp is warm enough, the system will start dosing. The usable temperature of the DEF is between −10° to 55°C (14° to 131°F).DEF Injector
Illustration 5 g03708843
Typical example
(1) Electrical connector
(2) DEF outlet connection
(3) DEF inlet connectionThe DEF injector is mounted to the Clean Emissions Module (CEM). The DEF injector is a valve

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