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Carter Excavator Repair

Carter CAT365BⅡ Excavator Engine Failure Diagnosis

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CAT365BⅡ large excavator, short arm type bucket capacity can reach 4 cubic meters. High power. high working efficiency. It adopts Carter's 3196 engine, which is an EFI diesel engine with a cylinder diameter of 130mm, a stroke of 150mm, a displacement of 12L, and a power of 365KW. The fuel system uses a mechanically actuated electronically controlled unit injector (EUI). The EUI unit injector uses the mechanical force generated by the camshaft to generate high injection pressure, which will pump components. The electronic fuel metering element and fuel injection element are combined in a single device, and the engine electronic control module (ECM) controls the throttle signal sent by the computer board of the locomotive owner. And signals from each engine sensor. Then give the correct pulse signal to the solenoid of the electronically controlled unit injector (EUI).
Activate the injector to inject fuel to produce the proper engine speed. The electronic control system is integrated into the engine fuel system and engine intake and exhaust system to electronically control fuel delivery and injection timing. Compared with conventional mechanical engines, the electronic control system can provide enhanced timing control and Fuel-air mixture ratio control. Fuel injection timing is achieved through precise control of fuel injection ignition timing. The engine RPM is controlled by adjusting the duration of the injection. The fuel injection pressure can be as high as 30,000 psi (about 2100 kg / cm2), which makes the fuel atomization better and the emissions better. The computer board of this model has an organic vehicle master control board. Important information The control board (VIDS) and engine control board (ECM), because the handle is an electronically controlled handle and the engine is an EFI engine, the electrical signals of various input and output are more than that of general models.
Therefore, the computer board is more powerful. There are parameter keys on the monitor, which can call out many important parameters of the locomotive and the engine, such as the output signal of the electric control handle, and the current value of the pilot proportional solenoid valve on the main control valve that controls the action of each mechanism. Current of power shift pressure reducing valve of main pump and rotary pump. Signals from various important sensors of the engine, etc. When the engine fails to enter the vehicle, the possible causes are problems with the starting circuit, or a fuel supply failure. Or there is a mechanical failure. Once on the construction site, I encountered a CAT365BⅡ failure to get on the car. The driver reported that the machine was still working at night, and after the day shift was over, the car could not be hit because it occurred under normal shutdown and there was a mechanical failure It is very unlikely. Turn on the key to turn on the power. If there is a circuit fault, the fault content and fault diagnosis code will be displayed in the monitor's information display center.
A low coolant level is displayed. Because this display already exists. It is a failure of the sensor and does not affect the startup. Press the main menu key of the monitor to call the diagnostic fault and code. Because there is no other fault displayed, you can ignore the circuit reasons first. When the test is started, the starting motor can rotate. , The starting speed is sufficient, you can rule out the problem of the starting circuit and the battery voltage is insufficient, the engine sound is normal, no abnormal noise. In accordance with the principle of "easy first, then difficult", first eliminate the possible reasons for the oil circuit. First exhaust the oil circuit. There is no air in the oil circuit. When the hand pump pumps oil, it feels a lot of pressure and the fuel pressure is sufficient. Check the fuel pressure regulating valve (back Pressure valve), there is no problem, there is no leakage or blockage in the oil circuit. The cause of the oil circuit can be eliminated initially. In order to further confirm that the circuit is not faulty, it is necessary to check whether there is a current to the electronically controlled unit injector.
Because there is no dedicated Cat Electronic Technician (ET) inspection tool, a test lamp is used for inspection. After testing, the test light is on. It means the circuit is normal and there is current to the injector. Therefore, the preliminary judgment is that the single fuel injector is faulty, because the fuel injector of this machine has been used for more than 5,000 hours. Because the construction site is in Sudan in Africa, the local fuel quality is also very poor. The plunger inside the injector. Valve cores, nozzles, etc. have been worn out, causing the atomization of fuel and the amount of fuel injection to fall short of technical standards, preventing the engine from starting. Because there is no new injector to replace at the construction site. The ordered accessories take a certain amount of time to arrive, so use a starter fluid to help start, in the case of using a starter fluid. The engine can start and basically work normally, but at the 10th speed, there is a phenomenon of unstable speed, after the accessories arrive.
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