The reason for the lack of rotation of the hydraulic motor is mainly due to insufficient pressure and flow of the main pump output or an increase in the clearance of the internal fitting of the final drive motor. So how do we rule out this problem? The following is a description of the inspection and elimination methods for the rotation of the hydraulic motor. There are four points.
1. Under the premise of the main circuit safety valve, overload valve and other accessories intact, the oil inlet pipe and the motor interface should be sealed from oil leakage, and the maximum pressure of the oil supply circuit should be measured when the final drives is positive or reverse; The motor pipeline measures the pressure at the time of load; finally, the measured value is compared with its technical requirements to determine the fault location.
2. Because the flow rate of the hydraulic pump is insufficient or the pressure is low, the motor output power will decrease, the torque and the speed will decrease at the same time. Therefore, the measured flow rate should be synchronized with the measured pressure.
3. Check whether the clearance between the distribution shaft and the rotor hole is within the allowable range. Check whether the rotation center line of the distribution shaft and the cylinder hole are consistent. If it exceeds the allowable value, reassemble. If the final drive parts matching clearance between the distribution shaft and the rotor hole exceeds 0.6 mm, or the groove in the rotor is grooved in the circumferential direction; the clearance between the plunger and the rotor exceeds 0.05 mm, and the clearance between the square shaft of the roller and the chute exceeds 0.05 mm. It will make the curve motor in the low speed and high torque turn weak. If the two travel motors are not synchronized, the track will be deflected.
4. The swash plate type axial piston travel motor, after long-term high-speed operation, the bearing clearance of the motor output shaft will increase, and the axial positioning clearance exceeds the large spring compensation value; the cylinder rotor and the distribution plate are on the center positioning rod. The four disc springs can not normally reduce the fatigue strength of the rotor cylinder to the disc spring. When the spring force drops, the motor can run normally in the cold state, and the disc spring deformation will increase in the hot state, resulting in a decrease in the flow distribution capability. Causes the motor to run weakly. When the gap between the rotor and the cylinder bore exceeds 0.05mm, or the wear exceeds the normal value, it will cause the motor to be weak and slow to run. https://www.spfinaldrives.com/