They say 5 psi is enough to keep a plain bearing apart. You may not have that at all your bearings. The factory idiot pressure warning switch will possibly have a rating on it, or can be cross referenced, but usually they only indicate a few psi probably in the range of 4 -8 psi at a guess. If it is on you are in trouble if your pressure readings are correct. Could be bypass vave (seat or spring), pump, loose bearings, oil quality, an internal leak, wrong and/or blocked filter, blocked oil pick-up, leak on pick-up, low oil level. You definitely need to investigate before it knocks itself apart.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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