I just completely redid my 400, and did the following (assuming an H is similar).
Removed the bolster, and took out the vertical shaft (laying the bolster on a strong table).
Got under the bottom part of the bottom bushing with a small screwdriver, and it just basically popped apart, since it is a split bushing.
Thought I'd try the same on the top part of the top split bushing, but was having a lot of trouble. Remembered someone here said to get a socket just the right size and pound it out from the top. That worked. It also pushed out the seal.
Noticed the top part of the shaft was very worn, so had it welded up and turned ($100).
Made up a long seal installer on my woodturning machine, and installed the top seal from the bottom of the bolster "y".
Drove the top bushing in from the top with a flat piece of walnut, then finished it with the socket.
Tried the same from the bottom with the bottom bushing, but I pretty much banged up some wood getting it 3/4 of the way in. Then I installed the vertical shaft and pulled the bushing up with the top castle nut, leaving out the thrust bearing. The bearing fits inside the bushing later.
My bolster only has felt above the thrust bearing and not a rubber seal. My thrust bearing was horribly cruded up with mud, and I should have replaced it but cleaned it and greased it up good, and made a thin spacer between the bottom of the bearing and mating surface of the vertical shaft (for clearance between the bearing and shaft -- it was rubbing).
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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