Howdy all,

I know this is a long shot, but I am looking for a CAT 1B3730 - Berliss OR310 outer race for a pulley bearing race. I can't seem to find a cross reference and the search is coming up blank. I called 1 place online that said they have them but were out of stock and not on reorder. I found a NOS inner race but no outer. This is for the belt pully on a D4. They are about 3-7/8 id, 4.33 od and 1.75 wide. The ones in the unit are Berliss. Thanks all!

www.mrosupply.com/bearings/5216134_or310_berliss/
www.ebay.com/itm/115750135838

Thanks Josh! 

The first link is the place I called. Just ordered one from ebay. 👍

Well, it appears I'm back to square one. The eBay seller doesn't have the item in stock and never shipped it. I think I might do some measuring and see if there's another full bearing set that would work.

Try Vintage Motion. They can help with the old Cat bearings

I was finally able to source one! Thanks for the help everyone.