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Below is a copy of an earlier posting I made on this subject. Hope it helps. If you go the the archives on this board and word search (John Deere 34 35 A B oil pressure) you can read about 55 other good contributions on this subject. These side mounted pumps are fussy and have made the discussion board often over the years. Mark I have a similar A (417034) that had the same problem shortly after I got it. I took it back to the company that sold it to me which also has a big JD salvage yard. I worked with the owner and mechanic to slove the problem. Both are very good with JD 2 cylinders. With my pump and a salvage pump side by side, this is what we found: Slits to allow the oil flow between the gears and the cover had some build up which was cleared. The plunger was pitted bad on mine and some on salvage pump. Polished and used the best plunger. Spring behind the plunger was very weak on mine compared to the salvage unit. Used the stronger spring. Like the gears, there is no gasket available either. We made the gasket from THIN stock taking care that the tapped out gasket had no imperfections. (took two tries) Disassembly and reassembly is tight behind the flywheel, but can be done. We chose not to remove the flywheel. There have been no further problems. My oil pressure pin indicator pops up immediately in all weather, engine temp, and engine speed conditions. No overfilling necessary. We felt the weak spring and plunger condition was likely the problem. I agree with others that the newer pumps are a much better design. Good Luck, Mark
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