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BATTERY 0876694 - Caterpillar



0876694 BATTERY Caterpillar parts BATTERY
Rating:
41
Alternative (cross code) number:
CA0876694
087-6694
0876694
Caterpillar 0876694 BATTERY

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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 DEF tank. The coolant diverter valve will open when the tank temperature needs to be increased. With the coolant diverter valve fully opened, engine coolant will flow to the DEF tank header and then back to the engine. Once the DEF tank temp is warm enough, the system will start dosing. The coolant diverter valve will close to prevent any further heat transfer to the DEF tank. This avoids DEF in the DEF tank overheating. The usable temperature of the DEF is between −10° to 55°C (14° to 99°F).After the keyswitch is moved to the OFF position, the ECM will cycle the coolant diverter valve open and then closed. The coolant diverter valve is cycled open and then closed to exercise the coolant diverter valve so that the coolant diverter valve does not seize up over time.DEF Injector
Illustration 5 g03749264
Typical example
(1) Coolant return port
(2) Electrical Connector
(3) DEF Supply line
(4) Coolant supply portThe DEF injector is mounted to the Clean Emissions Module (CEM). The DEF injector is a valve that injects DEF as a fine spray into the exhaust gases as an atomized mist after the Diesel Oxidation Catalyst (DOC). The spray pattern being conical for good mixing with the exhaust is critical.The tip of the injector, that is located in the exhaust flow, is cooled by coolant that flows through an internal coolant passage from the engine coolant supply.Nitrogen Oxide (NOx) Sensors
There are two NOx sensors supplied with the engine. One NOx sensor is installed before the Diesel Oxidation Catalyst (DOC). The other NOx sensor is installed in the tube assembly after the SCR canister.The engine produces NOx as the engine operates. The engine out NOx sensor measures the amount and communicates that value to the Diesel Exhaust Fluid Control Unit (DCU). The tailpipe out NOx sensor monitors the NOx level out of the catalyst and communicates that value to the DCU. Based on the engine out and the tail pipe out NOx sensor values, the flow rate of the Diesel Exhaust Fluid (DEF) will adjust to meet the desired tail pipe out target.
Illustration 6 g03403971
Typical example
(1) Sensing unit
(2) Cable (black for engine out, gray for CEM out)
(3) Sensor electronic control unit
(4) Electrical connectorThe NOx sensor contains a sensing element, a harness, and an electronic control unit. The sensing element is composed of two chambers and a heater. The first chamber measures the amount of oxygen and the second chamber measure the amount of NOx and NH3. Using electrochemistry, a ceramic material attracts ions at approximately 800° C (1472° F) and an electrode on the chamber wall


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