The engine output power of small excavator is insufficient. The performance is as follows: normal operation at runtime.

　　在I、III运行时，节流阀自动回到1150-1250r/min范围，回到1500-1800r/min，泵压25Mpa，冒黑烟;空转速度低，停机排放白烟;燃油回流管过热。

　　During the operation of I and III, the throttle valve automatically returns to 1150-1250r / min, 1500-1800r / min, pump pressure 25MPa, black smoke; idle speed is low, stop and discharge white smoke; fuel return pipe is overheated.

　　产生这些问题的原因包括:燃油质量差、燃油压力低、气门间隙不正确、汽缸运转不正常、燃油喷射正时不足、燃油流量不足、进气系统泄漏、刹车和运转。活塞杆损坏，涡轮增压器沉积。

　　The causes of these problems include poor fuel quality, low fuel pressure, incorrect valve clearance, abnormal cylinder operation, insufficient fuel injection timing, insufficient fuel flow, intake system leakage, braking and operation. Piston rod damaged, turbocharger deposited.

　　按照从简单到复杂的步骤:检查机油是否合格，并使用合格的燃料。检查发动机气缸是否工作正常，各气缸是否工作正常。检查回阀,检查气门间隙,并检查进气阀的宽容发动机气门间隙检查燃油压力是否过低,回油是否过高或返回油压是否足以调整排气阀间隙。接下来，根据机器喷油正时和燃油量控制指令调整喷油正时和燃油量。

　　Follow the steps from simple to complex: first check whether the oil is qualified and use qualified fuel. Check whether the engine cylinder works normally and whether each cylinder works normally. Check the return valve, check the valve clearance, and check the tolerance of the intake valve engine valve clearance check whether the fuel pressure is too low, whether the return oil pressure is too high or whether the return oil pressure is enough to adjust the exhaust valve clearance. Next, adjust the injection timing and fuel quantity according to the machine injection timing and fuel quantity control command.

　　小型挖掘机发动机水温较高，经以上检查后，机器将再次进行测试。当发现i-iii块工作时，排气正常，转速和泵压低。在第三档工作时，刹车不动。加注后采用节流阀控制，大型泵的发动机转速和泵压增大，但出现黑烟。这可能是由于手动操作的油门控制，导致不均匀加油。再检查一下刹车。，检查刹车电路。结果正常。拆下刹车，发现里面有灰尘。检查并清洗零件，安装检查过的刹车，然后再对机器进行测试，以确保故障已经。然后更换新的刹车，测试机器，观察各种齿轮，发动机转速，泵压，排气是否正常。

　　The engine water temperature of small excavator is high. After the above inspection, the machine will be tested again. When I-III block is found to work, the exhaust is normal, and the speed and pump pressure are low. When working in the third gear, the brake does not move. The engine speed and pump pressure of the large pump increase, but there is black smoke. This may be due to manually operated throttle control, resulting in uneven fueling. Check the brakes again. First, check the brake circuit. The results were normal. Remove the brake and find dust inside. Check and clean the parts, install the checked brake, and then test the machine to ensure that the fault has been eliminated. Then replace the new brake, test the machine, and observe whether various gears, engine speed, pump pressure and exhaust are normal.

　　介绍了小型挖掘机发动机产量不足的原因及处理方法，希望对您有所帮助。

　　This paper introduces the causes of the insufficient output of small excavator engine and the treatment methods, hoping to help you.