**Disposal of Damaged Input Bearing of PY160C Motor Grader**
Home > Bearing Knowledge > Disposal of Damaged Input Bearing of PY160C Motor Grader
Source: Bearing Network | Time: February 3, 2014
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A Tiangong PY160C high-prototype motor grader, with less than one year of operation, experienced three consecutive failures of the input shaft bearing in its hydraulic transmission. The time intervals between these incidents were 600 hours, 400 hours, and 230 hours, showing a clear acceleration trend. The machine was purchased in May 2003, and all operations and maintenance were strictly carried out according to the manufacturer's instructions. Given that each time the bearing was replaced following the official guidelines, it is unlikely that the issue stemmed from the bearing quality itself.
The transmission system connects the output shaft of the torque converter to the input shaft of the transmission. The horizontal distance between the two shafts is 265mm, while the vertical difference is 30mm. This creates an angle of approximately 6.5 degrees between the drive shaft and the transmission input shaft. The drive shaft is supported by radial ball bearings at both ends. However, based on analysis, it would be more appropriate to use tapered roller bearings, which have better load-bearing capacity. This is because the universal joint used in this setup does not have a constant velocity characteristic—meaning the angular velocity of the input and output shafts are not equal. This uneven speed causes additional alternating loads on the supporting bearings and connected components, reducing their service life.
As the angle between the drive shaft and the driven shaft increases, the non-constant velocity effect becomes more pronounced, leading to greater stress on the bearings. In the layout of the motor grader, changing the transmission method between the torque converter and the transmission is not practical. Therefore, the best solution under field conditions is to reduce the angle between the two axes as much as possible, thereby minimizing the impact of the universal joint’s non-constant velocity characteristic.
To address this, a 10mm thick speed control washer was added to the transmission support, reducing the angle between the drive shaft and the transmission output shaft to 4.3 degrees. After this adjustment, the grader has operated continuously for over 1800 hours without any issues related to the input bearing. The bearing continues to function properly, proving that the problem was indeed due to misalignment rather than bearing quality.
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