The mechanical vibratory roller is often unable to operate due to the failure of the driving system in the compaction operation. Our company has many years of working experience and many roller models. On the basis of continuous research, we have summarized a lot of practical experience. The vibration system fault of vibratory roller will affect the working process. Today, I will briefly analyze the diagnosis method for this problem, so as to eliminate the fault quickly.

在排除电气故障后，检查振动马达与振动轴的弹性联轴器和振动轴内润滑油的状况。润滑油过多会使振频上不去，一般是因马达组合油封损坏向轴内漏油所致。如果振动轴花键套磨损严重，也会导致失振故障，此时应对补油压力、系统工作压力进行检测，从而做出诊断。

After removing the electrical fault, check the elastic coupling between the vibration motor and the vibration shaft and the condition of the lubricating oil in the vibration shaft. Too much lubricating oil will make the vibration frequency unable to go up, which is generally caused by the oil leakage into the shaft due to the damage of the motor combined oil seal. If the spline sleeve of the vibrating shaft is seriously worn, it will also lead to vibration loss fault. At this time, the oil make-up pressure and system working pressure shall be detected to make diagnosis.

检查油泵泄漏量、机械摩擦力大小、传输管道的泄漏和堵塞，调节阀的调定压力和流量正确与否，查明后，应对症排除。

Check the oil pump leakage, mechanical friction, leakage and blockage of transmission pipeline, and whether the set pressure and flow of regulating valve are correct. After finding out, the symptoms shall be eliminated.

另外，再检查液压马达的本身的容积效率，机械摩擦阻力和背压力。

In addition, check the volumetric efficiency, mechanical friction resistance and back pressure of the hydraulic motor.

如果液压马达因磨损或密封件密封不良而泄漏量加大，或机械摩擦阻力过大，则多是液压马达转速低、转矩小的原因所在，应进而查明并对症排除。

If the leakage of the hydraulic motor increases due to wear or poor sealing of seals, or the mechanical friction resistance is too large, it is mostly the reason for the low speed and torque of the hydraulic motor, which should be found out and eliminated.

由于机器的前后振动系统既独立又相互联系（共用补油泵），所以可应用"元件置换法"进行诊断。比如，有一轮振频低时，可将前、后两马达的管路互换，若故障已转移，则表明故障是在泵上，否则是马达有故障。同样，对用于变频操作的排量控制阀也可采用同样的"互换法"作诊断。

Since the front and rear vibration systems of the machine are independent and interrelated (share the make-up oil pump), the "element replacement method" can be used for diagnosis. For example, when the vibration frequency of one wheel is low, the pipelines of the front and rear motors can be exchanged. If the fault has been transferred, it indicates that the fault is on the pump, otherwise the motor is faulty. Similarly, the same "interchange method" can also be used for diagnosis of displacement control valves used for frequency conversion operation.

振动主油路的启振初始压力可达32MPa,其连续工作压力大振辐时可达20MPa,小振幅时约为12MPa.当发动机在额定转速下其连续工作压力大大高于标准值时，则应检查振动轴的转动灵活性，即用专用工具旋转振动轴，使偏心块处在高位后再释放，此时振动轴应能摆动几次，若感觉阻力大，则应更换振动轴轴承。

The initial starting pressure of the vibration main oil circuit can reach 32Mpa, its continuous working pressure can reach 20MPa when the vibration amplitude is large, and it is about 12MPa when the amplitude is small. When the continuous working pressure of the engine at the rated speed is much higher than the standard value, check the rotation flexibility of the vibration shaft, that is, rotate the vibration shaft with a special tool to make the eccentric block in the high position and then release it. At this time, the vibration shaft should be able to swing several times, If the resistance is large, replace the vibration shaft bearing.