How to identify the fault of shaft bearing

Automobile water pump shaft bearing: three ways to identify bearing faults

      1. Recognize through sound

       Recognition through sound requires a rich experience. It is necessary to go through plenty of practice to be able to distinguish between bearing sound and non-bearing sound. For this reason, a dedicated person should do the job as far as possible. You can clearly hear the sound of the bearing with a listening device or a listening stick attached to the shell.

       2. Identify after operating temperature

This method is a comparative identification method and is limited to occasions where the work situation does not change much. For this reason, it is necessary to record the temperature continuously. When something goes wrong, not only will the temperature increase, but it will also show irregular changes. It is advisable to use this method together with the sound identification method.

       3. Identified by the condition of the lubricant

       The lubricant is sampled and analyzed, and after its turbidity, it is judged whether it is mixed with foreign matter or metal powder. This method is particularly useful for bearings or large bearings that cannot be accessed for investigation.

Causes of heating of needle roller bearings and its elimination methods

     (1) Reason: low bearing accuracy. Method: select bearings with specified accuracy grades.

     (2) Reason: The spindle is bent or the box hole is not concentric. Method: Repair the spindle or box.

(3) Reason: The belt is too tight. Method: Adjust the belt to make it tight.

     (4) Reason: Poor lubrication Method: Use the lubricating material of the specified brand and clean it appropriately.

     (5) Reason: Low assembly quality Method: Improve assembly quality.

     (6) Reason: The inner and outer shell of the bearing run laps. Method: Replace the bearing and related wear parts.

     (7) The axial force is too large. Method: Clean and adjust the seal ring gap between 0.2mm and 0.3mm, correct the diameter of the impeller balance hole and check the static balance value.

     (8) Bearing damage method: replace the bearing.