One of the things that our "new" JD Model A tractor had against it was that it was absolutely covered in grease and oil and made an oil spot wherever you parked it. Several of the competitive bidders on this tractor downgraded it because it looked like it leaked out of places that no tractor could leak out of. ONE O-RING in the single Pioneer hydraulic quick coupler was causing the entire mess. The leak was positioned in just the right way to drop on, splash on, run on, and soak onto just about everything on the tail end of that tractor. It really was remarkable how quick all the "leaks" seem to disappear once we installed a new o-ring! There was also an added-on unvented reservoir extension that was not well thought out and THAT was also contributing to the problem by forcing oil out of the rockshaft seals. When I first looked at this tractor I saw the rockshaft leaking and thought: "How can this be? John Deeres don't leak there?" Sure enough, it was caused by the unvented add-on tank. We also treated the tractor to a new loader hydraulic hose and got those fittings tight and leak free as well. WOT a difference! Now it's on to the clutch problem.....it's still sticky and the tractor wants to "run on" after the clutch is snapped out.