Re: John Deere bearings

Posted by Rwolfejr on August 25, 2011 at 13:56:12 from (67.163.184.160):

In Reply to: John Deere bearings posted by EBinOregon on August 25, 2011 at 08:44:16:

In the bearing world there are a few more things to figure out besides size. You have your I.D. ... O.D. ... and Width. But probably more important you need to know what sort of "fit" is best for the type of service or the application the bearing is running in.

Mother Deere engineers already figured out what works pretty darned well in there and if you grab your bearings there you can have that warm fuzzy feeling of knowing that things are as they were intended by design. (Unless a bearing has spun or some shaft wear or a booger in a bore or on a shaft etc. to effect the fit.)

The Deere's aren't Swiss watches... but you CAN buy a bearing that will appear to fit just fine that COULD screw up your entrails.

Example... You can buy a 6020 bearing as a 6020... or a 6020C1... or a 6020C2... or a 6020C5 ... or a 6020P4C12Z... or a 6020P4A2RS1

All of these bearings will have the same basic dimensions but not quite the same thing. The suffixes tell a lot about a bearing. Seals or shields... what ABEC rating they're made to... cage material used... matched... or internal clearances to name a few.

We had fellows here at the shop change out some bearings in an old lathe here years ago and I noticed that we were replacing them way too often. Turned out the bearings that were installed weren't what originally came out. The original bearings had a suffix of C3 or maybe it was C4 I forget. A bearing without that suffix was destined to fail in the application because both the fit to the shaft and the fit in the bore needed to be a light press fit. The design and or assembly demands a light press for both. The C3 suffix denotes a "Clearance Greater than Normal" for the internal fit of the balls to the inner and outer races. Without that extra clearance... once pressed together there was no running clearance for the balls in the races. Poof... smoked bearings.

This isn't to say that the correct bearings can't be had for less by going to a place like Applied Industrial or Motion Industries etc. but you will need to know what to ask for. You can't rely on them to know the specific design criteria needing to be met to select the correct bearing. I'm really doubting that any counter jockey at a parts store will know what to sell you either. As in the example of the 6020 vs. 6020C3... Both bearing will measure EXACTLY the same I.D. and O.D. and Width but the one is meant for an install of a tighter fit and the other isn't.

So back to your question of any cross reference list... Better be sure the source knew what they were doing when they whipped the list up. Would suck to have to tear it all back down again. Better off paying the few extra bucks and get it done right.

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