A Caterpillar cat340 excavator has always had a high water temperature when digging the earth recently, and there is also the phenomenon of black smoke
cause of issue:
1 The oil pump and nozzle may be faulty
2 The abrasion of the hydraulic pump pump and the valve plate will also cause the excavator to emit black smoke and prevent vehicle failure
3 Diesel pump and supercharger are worn
4 Mismatch in the pressure and flow data of the hydraulic system will also cause the black smoke of the excavator and the failure of the vehicle
5 The hydraulic system power is greater than the engine power to cause suffocation
Diagnostic steps:
1 First, check the working condition of the engine, you can try to perform a cylinder-by-cylinder oil cut-off test when the engine is running. Too much fuel supply; if the engine has no change or a small change, it means that the cylinder has too little fuel supply; if the engine speed changes little and the black smoke disappears, it means that the spray quality of the cylinder injector is poor. After the single cylinder, further check the cause of the failure, such as the plunger pair of the fuel injection pump of the cylinder, the looseness of the sector gear fixing screw and the breakage of the plunger spring, etc. If it is normal, the fuel injector can be dismantled and replaced if necessary Install a new fuel injector for comparison; if the fault disappears when a new fuel injector is used, it indicates that the original fuel injector is defective.
2 If the injection volume of each cylinder is too large, the governor cover should be opened to check whether the scale of the adjustment gear bar moves too much into the injection pump casing (the scale line should be equal to the rear end surface of the injection pump casing). At the same time of black smoke, you can also hear a crisp knocking sound in the cylinder, indicating that the injection time is too early, and the injection timing should be correctly calibrated. If the air filter is found to be clogged (the filter element is dirty) during the inspection, it should be Wash and blow clean.
3 Secondly, if the injection pump plunger tappet has adjustment screws, it should be checked whether the injection timing of each cylinder is consistent.
Sumitomo excavator black smoke water temperature is boring and fault repair method:
1 First, check the quality of diesel oil used by the excavator.
2 Second, check the fuel supply of the excavator diesel pump.
3 In addition, check whether the excavator air filter is blocked.
4 Adjust the fuel injector of the excavator, replace the fuel injection nozzle with bad atomization, and calibrate the diesel pump.
5 If you still cannot eliminate the black smoke caused by the excavator, then check the hydraulic system of the excavator.
