How To Repair Excavator Engine Speed Drop

First of all, the output power of the engine itself should be tested. If the output power of the engine is lower than the rated power, the cause of the failure may be poor fuel quality, low fuel, wrong valve clearance, a cylinder of the engine does not work, wrong injection timing, wrong setting of the fuel amount, air leakage of the intake system, and carbon accumulation of the turbocharger with hair on the brake and its control lever. If the engine output power is normal, it is necessary to check whether the flow of the hydraulic pump and the output power of the engine do not match.

The speed of hydraulic excavator in operation is inversely proportional to the load, that is, the product of the flow rate and the output pressure of the pump is an invariant, and the output power of the pump is constant or positive. If the pump control system fails, the load optimization and matching state of the engine, pump and valve in different working conditions can not be realized, and the excavator will not work normally. This kind of fault should start from the electrical system, then check the hydraulic system, and finally check the mechanical transmission system.