RX1Jim
TY 4 Stroke Junkie
The life of all of the "sealed" ball bearings can be gretly extended with a little maintenance. I put the word sealed in quotes since the seals actually do only a fair job in keeping out contaminants. Water works its way past the seals and stays in the bearing. Most of the damage is done to the bearings in the off-season as the water and warmer temps allow the balls and races to rust. I remove all of the sealed ball bearings at the end of the season, pop off the seals and clean out the old grease and crud and relube them with a water resistant synthetic grease. Since I have to trailer my sleds 6 hours to my sledding home base, I perform this service on the drive axle bearing (speedo drive side) after every trip. It only takes 30 min. and I find a samll amount of water in the bearing every time. Rust and corrosion due to water is the major cause of bearing failure. I installed 4 stainless steel bearings in the rear skid frame as an experiment to see if they will last longer. They are a bit expensive, I'm about to remove and inspect them.