Siemens Motor Bearing Identification 1

[cokeguy]

I have a siemens 50 HP model RGZPSD motor whose nameplate indicates the following bearings:

shaft end: 60BC03JP3
op end: 50BC02JP3

The problem is my bearing supplier cannot identify this bearings, but the nameplate is clear enough so I have no doubt the numbers are correct. I searched SKF, Timken, etc. websites to no avail.

The motor is running right now, but I need to have the new bearings ready when we stop the motor, so I can´t wait until we stop the motor to verify the bearings. Can anybody identify this bearings? Thanks....

 

[stardelta]

Just the mention of the word "Siemens" puts the repair guys like me into a cold sweat, they are a law unto themselves. I have been in a similar position myself, we had an inverter rated compressor motor made by Siemens in recently for overhaul and I had the exact same problem identifying and sourcing replacement bearings from an obscure ref` number. It seems on some Siemens motors the bearings are made by a third party to Siemens spec` hence the unusual reference numbers. You will find they may well be dimensionaly identical to the standard 62 or 63 series but have special features such as a plastic cage or be ceramic-coated or have a C3/C4 or even C5 clearance. In our case the bearings were originaly made by NTN, the name being etched on the race. I contacted a NTN dealer who after some digging told me the bearings in question were made soley for Siemens to a protected design and that NTN will not sell them to a third party, they were only available from Siemens themselves as a spare part. I contacted Siemens with a view to obtaining them and was told there were none in the UK at that time and they would have to be freighted in from Germany at a considerable cost. being a repairer we had no option, if we had fitted any other type of bearing we would have been liable for any future problems that may have arisen as a result of non standard bearings being used.
My advice would be for you to contact Siemens themselves and obtain them as spares like I ended up doing, you are then 100% certain they are suitable for the application.

 

[electricpete]

Those are AFBMA numbers. Should be no problem to cross reference. Off the top of my head for SKF would be something like:

shaft end: 60BC03JP3 = 6312 Z (C3)
op end: 50BC02JP3 = 6210 Z (C3)

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[electricpete]

I can tell stardelta is also familiar with the part numbers from his discussion. I think we interpretted the question differently. As I read the question, you just want to convert the AFBMA into catalogue number, right? The answers I'm fairly certain are as above and you can also find them on almost any bearing manfuacturer's website. If your bearing distributor can't do that conversion, I would fire him.

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[electricpete]

stardelta - Is it possible the motor you are talking about was a special-purpose motor designed for that application? In that case it seems possible they put in special bearings.

RGZPSD is a standard off the shelf catalogue motor. We have several. No plastic cages or other strange features that I know of.

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[ozmosis]

cokeguy
check out the following link:

http://www.sea.siemens.com/motors/product/mtnemaapmanual.html

click "mechanical data" and this will provide more info on the bearings (and everything else.
I think as electricpete says, I can't see anything special with the bearing. If there was a "-Z" at the end of the part number on the motor nameplate, then this would indicate there would be something 'non-standard' usually.

 

[stardelta]

Pete,
The motor we had in was special in that it was inverter rated and according to the name plate had a max speed of 5500 rpm so its quite possible that there was something special about them. I didnt actualy physicaly see the bearings so cant say for certain what made them special. I will find out though and post the answer.

 

[cokeguy]

Thanks everyone, and yes Pete, I´ll sure tell my bearing distributor to "change his batteries", he´s slowing down, although I have to say that normally he´s very good at finding all sorts of bearings, pulleys, sprockets, chains, belts, etc.. (and I certainly need to document myself on bearing nomenclature)