High Temperature on Bearing

Hi,

We have a issue on Bag Filter fan Drive Bearing, It has been running on high temperature for last month. Around 100 degree C. It was replaced before three months, After a right quantity  of greasing its temperature remains high. I can see there is no High G's Value or early signs of bearing in a peakVue, Infact there is a little resonance ( wobbling ) in one belt. Bearing BPFO Peaks are not matching a little difference with matched lines, there is not high temperature on pulleys or shaft. So what could be the reason of High temperature???

Motor RPM = 1480 Belt Driven Fan RPM = 1650, 5 belts V type.

I have attached spectrums & information, Need your Opinions guys ???

Thanks in Advance

Attachments

Original Post

1.ring available opportunity check the bearing clearance and sleeve fitment.

2.apply right quantity of grease

what could be the reason of High temperature ?? over tightening bearing mounting sleeve lead to the reduced baring clearance , low bearing  internal clearance lead to high friction and temperature .

First, I think you can check by use air to inject to the bearing and see whether vibration and temp is drop down or not. If temp or high frequency vibration down mean too much grease was used.

then, if the problem still remain, you can check the bearing for installation error, kind of grease, clearance...

Ngo Dinh posted:

First, I think you can check by use air to inject to the bearing and see whether vibration and temp is drop down or not. If temp or high frequency vibration down mean too much grease was used.

I would not recommend that. There is a danger that the grease will end up in the windings of the motor and lead to a failure of the insulation.

One thing that can be tried is to remove the drain plug when the motor is running, if there is a excess of grease it might come out that way.

 

Takamol posted:

Beatnik,

I think NGO was talking about Fan Bearing, Not a Motor bearing.And the temp issue is on Fan NDE bearing! 

I am awaiting for a stoppage, we will inspect it deeply & will share  you the results

 

Thanks

You are right! Sorry NGO, I assumed (with my poor English) that drive meant motor.

Pull the cap off and remove some of the grease inside. I have never had a bearing run that hot from over greasing, but it's something to try. Also, how much clearance do you have between the outer race and rollers? You know the bench test you do while driving the bearing up.

Beatnik, i think you are very kind of giving an announcement for a risk case.

Actually, in my plant, i have a similar case with high temp issue and at first time, we do not think the problem from too much grease. And then, we tried to use air (low pressure, of couse) with drain plug open and i saw grease come out, then, the temp drop down from 84oC to 72oC. It just take 3 minutes. After that, machine can run smoothly.

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