When I get some time, I plan to overhaul the original pump. It will require some sleeving and machining that I do not have the time to do now. I acquired a used pump that is in much better condition than the original. There is one significant difference between the two pumps, though. The original oil pump has gears that are 2" tall and the replacement has gears 1.5" tall. They each have the same diameters. I don't see a huge problem with this as the original pump screen bounced off the bottom of the oil pan. There are witness marks to prove it. Why did Deere change the design of the pump in this way? Do I have to do anything to the pressure regulator piston to maintain safe oil pressure, especially at idle? I have to confess that I have not measured the springs in each pump to see if there are any differences and I have not referenced the service manual either. Is there any way to set the oil pressure with the pump out of the engine?
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