Any bearing experts

[toad]

I have a Rutland 913 wind generator that the bearings started to rumble after 13 months I replaced them with bearings from a local supplier but they only had Chinese bearings in stock. The Chinese bearings have only lasted 6 weeks and now the inner bearing is totally shot. The part no is 6202 ze which has a metal seal (fitted on the outer end of the shaft and therefore most protected) and the inner bearing has a rubber seal but I can not read the part number. Looking on the net it seems that 6202 is the size and I have a choice of rubber or steel seals, rubber being the better seal with a cost of higher rotating resistance. Also I have seen reference to higher clearance bearings for HI speed/low resistance applications I think. Each time the bearings have failed it has been the inner less protected bearings the have failed. The question is do I go for a pair of SKF with metal seals, metal seal on the outer bearing and rubber seal on the inner bearing, high/ low resistance or something else.
I will ring Marlec next week but it is nice to have some knowledge beforehand.

Ta

 

[Mistroma]

I think that I replaced mine with these (Low friction 6202):
http://simplybearings.co.uk/shop/p7...5x11mm+(+62022LFS+62022RSL)/product_info.html

I'll try to find the invoice to double-check. The new bearings seemed to have more resistance to startup than the originals, despite being sold as low friction. However, it hasn't been a problem as output is pretty negligible anyway with only 5-6kn of wind.

UPDATE:
Invoice was for following items (bought 2011) and the Rutland 913 is still working well.
2 x SKF62022RSL Deep Groove Ball Bearing with Two Low Friction Rubber Seals 15x35x11mm ( 62022LFS 62022RSL) (6202.2RSL.SKF)

I seem to remember that the original bearings only had a seal on one side but the new ones had seals on both faces. I could have removed the inside soft seal on each bearing quite easily. I imagine that extra seals account for some of the extra resistance to startup.

Not a bearing expert I'm afraid but I can confirm that the items mentioned did fit and average daily output over a season seemed to be similar to output when new.

 

[sailorman]

I have a Rutland 913 wind generator that the bearings started to rumble after 13 months I replaced them with bearings from a local supplier but they only had Chinese bearings in stock. The Chinese bearings have only lasted 6 weeks and now the inner bearing is totally shot. The part no is 6202 ze which has a metal seal (fitted on the outer end of the shaft and therefore most protected) and the inner bearing has a rubber seal but I can not read the part number. Looking on the net it seems that 6202 is the size and I have a choice of rubber or steel seals, rubber being the better seal with a cost of higher rotating resistance. Also I have seen reference to higher clearance bearings for HI speed/low resistance applications I think. Each time the bearings have failed it has been the inner less protected bearings the have failed. The question is do I go for a pair of SKF with metal seals, metal seal on the outer bearing and rubber seal on the inner bearing, high/ low resistance or something else.
I will ring Marlec next week but it is nice to have some knowledge beforehand.

Ta

Pls keep uds informed as to how Marlec respond. I understand their afte rsales / warrenty service has much to be desired

 

[NormanS]

Pls keep uds informed as to how Marlec respond. I understand their afte rsales / warrenty service has much to be desired

Have you had dealings with them? Or is that just hearsay?

I have found them extremely helpful, prompt, and reasonable.

 

[silver-fox]

Have you had dealings with them? Or is that just hearsay?

I have found them extremely helpful, prompt, and reasonable.

So have I, I have found them excellent in fact.

But then again so does sailorman when he says "I understand their afte rsales / warrenty service has much to be desired".

You probably read it like I did at a first pass as "leaves much to be desired" when he is in fact saying the opposite.

 

[skyflyer]

i have found the staff at SMB bearings to be knowledgeable and helpful and they can explain benefits etc of rubber or metal shields. Good prices too. I am not connected in any way. Their website has loads of technical info too.

 

[NormanS]

So have I, I have found them excellent in fact.

But then again so does sailorman when he says "I understand their afte rsales / warrenty service has much to be desired".

You probably read it like I did at a first pass as "leaves much to be desired" when he is in fact saying the opposite.

Quite correct. I did. Over to you, sailorman.

 

[toad]

Looks like Mistroma has the part no i need but I will give Marlec a ring tomorrow and see what they say.

 

[toad]

update

I spoke to Marlec today and the engineer was most helpful, they use Japanese Nachi bearings in all there wind generators, with metal seals in the outer part of the hub and rubber seals in the inner more exposed part of the hub. They used to use SKF bearings but had complaints that the initial friction reduced the low power generation until they had bedded in which could take a few months. His personal opinion was use SKF and accept a running in period.
So I have ordered a set of SKF bearings from the local supplier and he can have his Chinese bearings back. On close examination of the failed bearing it looks as though the seal is very poor quality.