It's a Ford 1900.Is this on a New Holland or Kubota? The only "oil bath" pan I know of on any tractor would be the cup on an "oil bath" air cleaner. On my old Farmall C, once you get the clamp ring off, it pretty much drops straight down.
Wow, that long, shame on them.Looks like it hasn稚 been cleaned in a pretty long time. On mine if I change it yearly it痴 pretty clean overall. Takes about three years for it to actually get even somewhat black and dirty. Remember it痴 not oiling any moving parts to get black. It痴 only air that draws the oil into the strainer filter and then transferred the dirt to the oil.