Why is oil leaking from hyd. Reservoir into p to reservoir on my 1947 model a John Deere tractor.?

Oil leaking from the hydraulic reservoir into the Power Steering (P) reservoir on your 1947 JOHN DEERe Model A tractor could be due to a faulty seal or gasket between the two reservoirs. Over time, wear and tear can cause these components to degrade, leading to cross-contamination of fluids. Additionally, excessive pressure in the hydraulic system might force oil past these seals. It's advisable to inspect the seals and gaskets for damage and replace them if necessary.