1938 Allis-Chalmers model B

I have this 1938 Alis-Chalmers model B tractor , It has live hydraulics instead of having to run PTO for hydraulics . Also it has a shaft saver already installed on PTO . Tractor runs great but the only problem is it has a liner that leaks every now and then , needs new o rings on 1 of the liners, IT doesn't always leak , but when it does antifreeze goes into the oil , I always loosen the drain plug to see if there's any coolant there because it will settle to the bottom . its a cold leak doesnt seem to happen when its warm .