Excellent point, the grease has to be able to flow. It is a lube, not a packing material. Over greasing blows the seals on a Ball/Roller Bearing, allowing dirt in because the seal no longer contacts the Races. Excess grease is more work to be pushed around, thus the heat buildup you mentioned. 3 pumps of the grease gun is all you normally do in most applications, you don't need to see the grease. Some don't even need that much. Check a site like http://www.kamandirect.com/products/bearings/products.asp for more info.We've been doing a lot of training here at work regarding "Precision Maintenance" at our plants. We use a lot of pillow block bearings, and one thing we've found is that the bearings were prematurely wearing out, due to overheating, as a result of TOO MUCH GREASE. Pump, pump, pump till its way full and squirting out was too much grease. I say non-greasable as well.