New to me Ford 3000 gas engine tractor was purchased from local NH dealer. Running but engine was noisy. Adjusted valves, painted sheetmetal, rebuilt gauge cluster, and discovered the oil light wire was NOT connected to the sending unit. It was connected to one of the generator terminals. Hmmm, fixed that. When I got it the gen and oil light both came on and went off when engine started. Now, the oil light stays on with the engine running. Removed oil sending unit, and spark plugs, cranked engine. I assume oil should have squirted out the sending unit hole, right? Now I'm suspecting the nice fella that traded this tractor hot-wired the oil light so it would appear to have oil pressure. Next I removed the oil filter and pump stop plug. Who has a 15/16" hex bit? Used a fat 15/16" hex nut and box end wrench to get it out of there. The oil pump drive gear looks good and turns when the engine is cranked. Out of time to mess with it. I guess the next step is to drop the oil pan, remove the oil pump and shaft to see if there is anything obviously wrong down there. Probably pull a couple of caps and see what the bearings look like while I'm down there.