I'm sorry to be responding to this thread so late, meant to get to this sooner. I can look up the valve adjustment specs, and can probalby come up with an engine manual. Valve adjustment will normally not have an affect on crankcase pressure, but overfull sump will. Do not run this tractor with the hydraulic oil leaking into the engine! This tractor holds roughly 5 gallons of trans/hydraulic oil and if too much of it gets into the engine bad things will happen. As Bob said, you will need to check the hydraulic pump and try to find the cause of the blown seal, usually running with one of the hydraulic quick connects loose does this. The new DF models have a pressure relief valve built into the system to help prevent this type of problem, but keeping the quick connects together and tie wrapped in place is usually sufficient. At 200 hours you should be on your 3rd oil change. If you just want to install a new pump rather than attempt a rebuild (results vary), we should have it in stock at ARTRAC.