You are right Allen; no tapered roller bearing should operate in a loose condition. To properly set tapered roller bearings so they run with no looseness is sometimes difficult when heat and expansion is involved. On tractor front wheel bearings, we tightened the adjusting nut to about 20 ft-lb and installed the cotter pin. The Timken rep about had a fit, but they didn't run fast enough to get hot and would last for years and thousands of hours. Transmission bearing settings are more involved. Your trailer bearing settings are relatively simple. They should not ever be loose, but should not be set so tight that they get hot and burn up. A very light preload always worked for me on trailers that are pulled 50 to 80 mph. But you are right; they should never operate in a loose condition.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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