Bearing Failure.

The best way to determine this is to send a photograph to, and open a dialogue with, the original equipment manufacturer. Whatever the cause was, it cannot be seen from here.

Here's some possibilities;

1. Wrong bearings.
2. Too tightly sandwiched.
3. Burnelled before or during installation. ( this means that the brg may have been dropped, put on the shaft crooked and tapped on the outer race leaving indentations on the interior of the outer race and indentations on the balls themselves dramatically decreasing life)
4. Find your Maint. Manual and follow the section on bearing replacement.
5. Be sure to free wheel the shaft before applying power to the pump.
6. Hope this helps!

I used to make ball bearings.

It's quite possible that one single bearing had an imperfection in it.

kramarat is could be right. Faulty bearings are very rare, but it can happen.

I have no connections with HMD, but they have always had a very good reputation, and have been making mag-drives for a long time, so I would be surprised to see failure due to wrong bearings, incorrect fitting, etc.

There is very little radial loading on these bearings, and as long as lubrication is looked after they usually have quite an easy life.

If the failure was down to something like brinelling or overheating, you would expect both bearings to be affected.

It is unlikely, but possible.

I wonder when the last time was that it was taken apart. Most bearing failures can be attributed to something besides the bearing itself.

Very true, it is almost always external factors that determine bearing life & failure, and I have only ever seen one instance of a 'suspected' (by the motor manufacturer) faulty bearing.

My point is that in most instances external factors ought to affect both bearings, NDE and DE (perhaps the DE bearing was also on it's way out, but the NDE bearing went first?).

Pack it up and send it to a local pump service company. You are the one there that has any hands on knowledge of the damage. You have given us little to go on here to make any diagnosis of cause of failure. Like omitting the length of time in service of the pump. Even a bearing has life limit given by the manufacture. Who manufactured the bearing? There can be a lot of little tell tale signs that we can not see even with pictures.

Bearing did not just go bad. This really does not happen unless there is some other issues such as shock loading or other extreme issues with equipment. I would say, it was going bad for awhile. Does your company do any testing such as ultra sound or vibration analysis on your equipment. Predictive maintenance practices solve many of the issues such as your seeing with your pump long before they just stop working.

Well worth looking into if your not doing this.

watch this video.

chris

Dear Mr.p16241487

1. Pl. check up or verify whether Bearing 6209 is correctly selected and the procedure for the BEARING SELECTION, is given by the Bearing Manufacturer, for the specific application.

2. What is the speed. If speed is higher than the speed meant for the particular size, the weakest portion will tend to fail.

3. It is possible that the cage itself could have defect before assembly stage.

4. Pl. take up the matter first with the supplier and in turn jointly with the bearing manufacturer. It is worth to do it.

DHAYANANDHAN.S