Posted by doc37172 on April 09, 2011 at 04:57:59 from (74.179.245.74):
A few days ago my ZA was running fine and holding 20-25lbs oil pressure. All of a sudden it now starts, builds pressure to 20lbs, but drops quickly to almost zero in 15-20 seconds. It will do this every time I start it. Adjusting the pressure will increase the pressure initially but it still drops in a few seconds. I have changed the gauge, cleaned the crankcase, oil pickup and oil lines of sludge. The oil pump adjustment passage looks good. I'm running a spin-on filter with 30wt oil. My next step is to pull the pump I guess, but I wanted to check here first. If the keys in the pump were broken it wouldn't generate any pressure, right? Any suggestions? I saw this same issue posted a few months ago on a ZT but never saw what the diagnosis or solution was.
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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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