quote:

Originally posted by IanS:


Harping on his a bit, but it really does not make sense. As Pete noted before, a 22215 bearing should have a bore of 75mm, or imperial equivalent (a shade under 3 inches). And the PK suffix; K refers to a tapered bore, but the P refers to a polyamide cage. A plastic cage in a spherical roller? At 3000RPM???

The SKF website does not list plastic cages in spherical rollers. Curiouser and curiouser.

That's my bad.....the bearing is a 22215EK....sorry my typo.

Also, the shaft diameter is 2 7/16" the actual bearing bore diameter sans the adapter/taper lock could very well be 75mm....that would make more sense.

Planty....you are correct. The inboard fan bearing is the float bearing here and it is the one that is severely overheating.

I can not speak to the load range on this application...it is a steel 27" radial tip fan that is overhung.

In the past, clearance was set to a "final clearance" and now they use a "clearance reduction." Does anyone know why the procedure was changed?

Showing your age now rusty. Its always been clearance reduction in my 25yrs career! Most (all?) include minimum residual clearance on their charts also.
I am guessing by having clearance reduction brg manufacturers can increase their manufacturing tolerences without risk of over stressing brgs.
Cheers

It's always been "Clearance Reduction" for me too, but I've only got 28 years in. Must have before that.
Seriously though, that is one of the things I still have to explain to some young'uns once in a while when they only look at the number on the the little pocket chart SKF hands out. For some reason, I guess it is easier for them to think that number is "final clearance". When you explain guaging before installation and then taking "this amount out", some don't want to (or can't) do the math.

D

The main cause that a bearing get heated is the friction. That means your bearing is rubbing. Check for the vibration readings. If you have a facility of using CSI peakvue it can be easily identified. You mentioned the bearing with normal clearance. Check with the OEM for any modification that can be done in the bearing clearance.