Tow dolly wheel bearings
I bought a used Master tow dolly and modafied it to carry a motorcycle and a car. I pulled the break hubs to check the wheel bearings and found that they were pumped full of greese. My question is...
Forum Discussion
If the bearings are packed correctly and the hub area between the races is full you get the best heat dissipation. Air does not dissipate the heat that is expelled from the bearing through the grease packed in to it. I would rather have the hubs full than clean with only grease on the bearings. You will only blow grease out past the seals if you actually fill the hub to the point it pressurizes as temps increase. You want the grease between the races to pull heat from them to the hub. My hubs very seldom run over 110 degrees F but then my trailers have only seen about 100,000 miles over the last 4 years. Having said that, you do need to leave some air space in the hub especially on brake equipped trailers but even if the spindle grabs some grease as you install the hub you will be fine.
Randy
Randy
