On the judgment of the common failures of the hydraulic excavator exclusion

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  With the advances in technology, modern excavators generally use the machine - electric - hydraulic integrated control mo de, we exclude some failure to address the multi-engine - hydraulic pump - distribution valves - the matching of the external load. Generally excavators operating in these areas can not match, often expressed as: engine speed decreased, the work slows down, and tap the weak.
    1, the engine speed drop:
    First to test the engine itself, the output power if the engine output power is significantly lower than the rated power, in the case of the construction site, to judge from the easiest way to start the first look at the fuel filter to plug the leak in the fuel path, fuel plunger pump, injector head, the outlet valve of serious wear and tear, open air filter intake with a turbo engine, the turbocharger is damaged, the engine of rapid high-temperature, oil viscosity decreases resulting in the compression cylinder wall closed strictly decreased, whether the cylinder compone nts wear and tear caused by the cylinder serious string gas engine valve closed lax, these are the factors that seriously affect engine power. If you exclude the lack of the engine itself, the output power, we must consider the hydraulic pump flow and the engine output power matching.
    Hydraulic excavators in construction operations, according to the operating load requirements, speed and load (flow and pressure) is inversely proportional to the product of the pump output pressure and flow is a constant pump output power of constant or nearly constant; The pump control system failure, you can not achieve a good engine - pump - valve - the optimal matching of the load in different working conditions area, so that the excavator can not be normal operation, so we must grasp the digging machine control systems of various manufacturers . EPOS system, such as Daewoo, Kato APC system, Komatsu CLSS system, etc.; in dealing with failure, is also simple to compl ex to analyze to confirm. Modern digging machine machine - electric - hydraulic integrated products with high technological content, treatment failure, usually start with the electrical system to start, and then check the hydraulic system, and finally check the mechanical drive system. Check the hydraulic system, the auxiliary oil - oil control - the main oil - control elements gradually checked.
    2, the slow pace of work:
    If the excavator used for many years, the rate gradually slows down, this is normal wear and tear caused. Major factor in the whole ministries wear resulting in decreased engine power and hydraulic system leaks, so that a series of failures are shown, due to leakage caused by the internal energy consumption, resulting in a lot of heat, bringing the system to quickly heat up, the hydraulic oil and engine oil viscosity decline, bringing the system to produce high temperature, the performance of slightly faster c ool car the more heat more slowly, which requires full machine overhaul, repair and replacement parts for wear overrun. New digging machine suddenly slowed, This first simple, complex, check the following aspects: first check the circuit fuse is open or short circuit; pilot pressure is normal; servo control valve - servo piston is stuck; distributor confluence failure; rule out other possibilities, and finally dismantling the hydraulic pump.
    3 excavator weakness:
    The machine is unable to sub-areas:
    First, when the external loads and engine sharp deceleration, which is reflected in the following two aspects:
    According to the aforementioned said first check the engine power
    Check the hydraulic displacement of whether to follow a constant power output. That does not affect the speed of the premise, to adjust the angle of the swash plate to reduce the displacem ent.
    Ministry load large engine does not slow down, and the system speed is normal; it is necessary to debug the system pressure by the manufacturers, the manufacturers of hydraulic components and hydraulic system provided for each hydraulic cylinder pressure, The debugging of the required standards.