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: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
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