Posted by NCWayne on July 20, 2014 at 22:59:40 from (173.188.169.54):
In Reply to: greasable dust caps posted by ertl collector on July 20, 2014 at 21:47:43:
I hate being a wet blanket, and I don't want to kill your idea but it has one, possibly two, fatal flaws, depending on how you look at it. What I'm talking about is the fact that when you add enough grease the the cavity in the hub will get full. Once this happens, one of two things is going to happen.
One, the pressure acting on the dust cover is going to push it off. That is the best case scenario. In that case you'll know the second it happens and can put it back on.
Two, and what's more likely to happen, given that the dust cover is installed with a bit of a press fit, is that the pressure of the grease will push past the hub seal. If it causes it to invert then contamination will be able to get into the hub.
If you look at the 'factory' setups, every one I have seen has a low pressure valve to prevent either scenario above from happening. Without that pressure relief the seal is almost always going to be the weak link, and without it working, no matter how much grease the bearings have, their life is going to be shortened by any contaminates that get in to them.
Your better off to just use a good grade of grease, and keep it checked at a regular interval if driving on dry land, and even more frequently if it's on a boat trailer that gets immersed. I work on trailers for a lot of different guys that do landscaping, etc, and the most frequent problem I see is that they let the bearings get loose, and their problems start there, I've seen some that failed, even with grease, simply because the hub got loose on the spindle. Rarely have I seen one, in fact I can't remember one, that crapped out completely from a lack of grease.
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