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.
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Today's Featured Article - Show Coverage: Argyle and Mt. Pleasant Labor Day Weekend Shows - by Cindy Ladage. The last fling before summer fades into fall and we get busy in the fields are the annual Labor Day tractor shows. Beginning on September 5th and running through the 7th, the Argyle Antique Gas and Engine Show is held at the Argyle State Park. Located in West Central Illinois, the pine forest was the setting for the opening of the 22nd show. This year we decided to try to sell a few tractor parts, literature and wrenches to offset my husband's buying sprees. Saturday
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