Symptoms and troubleshooting of drive shaft damage

1, the car suddenly changes the speed, the transmission shaft metal knock, can explain the individual flange or universal joint cross shaft bearing wear is too large and loose, cause the transmission shaft abnormal noise.

2, when the car starts, the transmission shaft appears "clang" or sound is disorderly. When the car is reversing on a gentle slope, it makes a intermittent sound of "cough", which means that the needle roller is broken or broken, and the needle roller bearing should be replaced.

3. When the car starts or shifts gears, the transmission shaft has obvious metal collision sound, and the low speed gear is more obvious than the high speed gear, which is mainly caused by the reduction of interference fit between the middle support inner ring and the shaft and the loosening of the inner ring.

4. When the car starts or runs, the transmission shaft always has a "clack" abnormal sound, accompanied by vibration, indicating that the fixing bolt of the middle support bracket is loose.

5. When the car is driving at low speed, there is a clear and rhythmic metal collision sound on the transmission shaft, and there is a clear sound when the car is out of gear and sliding. The multi-system universal joint bearing shell compression force is too large, so that the bearing can not rotate flexibly.

6. When the car is driving, the sound of the drive shaft increases with the increase of the speed, and the middle support bearing gives out dull and continuous cloudy sound, indicating that the middle support bearing is loose due to excessive wear.

The driving shaft of the car makes a continuous "whine" sound. First, check whether the fastening bolt of the rubber pad ring sleeve of the middle support bearing bracket is too tight or too loose, so that the position of the bearing bracket is deflecting. The tightness of the bearing cover bolt can be adjusted to eliminate abnormal sound fault. If there is still sound after adjusting the bearing pretightness, the lubrication condition of the bearing should be checked. If the bearing lubrication is poor, the bearing should be disassembled and cleaned, and the bearing and support should be installed after filling with grease.

7. When the car is driving, the sound of the transmission shaft is disorderly and irregular, and sometimes the sound of metal collision appears, which indicates that the universal joint fork at both ends of the transmission shaft is not in the same plane, so that the constant velocity arrangement is destroyed.

8. When the car is running at high speed, the transmission shaft has abnormal sound. When the car is off gear and sliding, the abnormal sound of the transmission shaft still exists.

9. In order to further verify the correctness of the above diagnosis, you can inspect and shake the parts of the drive shaft by hand when stopping to see whether the installation position is correct, whether the surface of the parts is damaged, whether the fastening connection is loose, and whether the clearance is too loose or too tight.

A. After parking, release the parking brake and push the universal joint with your hand. If it is loose, it means that the needle roller bearing of the cross shaft is loose.

B. Shake the parking brake disc back and forth by hand. If it is loose, it means that the spline of the second shaft of the transmission is loose.

C. Pull the parking brake tight and shake the rear flange of the middle drive shaft back and forth by hand. If it is loose, it means that the tooth of the spline shaft of the middle drive shaft is loose.

D. Pull the flange of the middle drive shaft back and forth by hand. If it is loose, it means that the rear nut of the middle drive shaft is loose.