Re: I need to replace some trailer bearings

Posted by Steve@Advance on July 29, 2017 at 18:09:24 from (66.169.147.211):

In Reply to: I need to replace some trailer bearings posted by sde on July 29, 2017 at 17:02:19:

I've never used the rubber plug type caps. The spring loaded Bearing Buddy type have a bypass hole to try to keep too much pressure off the seal, but it is still easy to push grease past the seal, or blow it out. Got to be real careful! Bearings are not intended to run packed completely full of grease, they tend to overheat, with no room for expansion the grease has to go somewhere, so it pushes past the seal.

Getting water in trailer bearings is not a real big problem under normal use. But boat trailers, or any time the axle gets submerged, nearly impossible to keep it out. What happens is the air and grease inside the hub are hot and expanded, it hits cold water, contracts, and sucks the water right in!

As for China bearings, I wouldn't be too afraid of them. Nearly all bearings are imported.

Here is a chart with common bearing numbers and dimensions. You can check the measurements of the old bearings, get the correct numbers for replacement.

• Bearing Chart

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