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 - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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