Another two tools in a guys arsenal to have his hubs last longer besides his greasing them carefully with the correct grease is first,if they sling grease,grass clippings build up,clean off.The 2nd tool is a digital temperature meter easily purchased at NAPA.With that you can check temps and quickly check a bearing problem or possibly a very tight belt issue.Normally a hub bearing gives you very little problems,but unfortunately when they do,oh my!.I have a new Kubota T-2290 and it has sealed bearings,they run about 110°,Very happy and believe they are working well.If for instance that temp jumps drastically, I can be a step ahead of possible costly issues