Bearing Buddies are quite different. They are spring-loaded and originally intended for boat trailers. Greasing the Bearing Buddy pressurizes the hub so water can't get past the seal.
The other system is the "E-Z Lube" axle, and is pretty common on utility trailers. The E-Z Lube axle has a passageway drilled through its center with outlets between the inner bearing and seal. Grease flows towards the dust cap, so in theory it won't be pushed out the seal. See the link below for a picture.
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Today's Featured Article - Updatin The Charging System of Your Older Tractor - by Tyler Woods. Older tractors have externally regulated generators or externally regulated alternators, in some instances. That means there is one device that turns energy from the fan belt into electrical energy,
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