Well I could see no need to drain the hytran oil per the recommended interval. If some particulates were in the crankcases the filter would catch them.....purpose of it. Mine is the 6530C and uses 15 gallons of premium trans/hyd fluid. I do not abuse my tractor in harsh environments, nor run it continuously under heavy loads for long hours, don't lug it, on and on. Under my operating circumstances I see it as a waste of natural resources, my time, and money. I did change the hyd filter with the OEM part number which I got off the www by putting the Branson PN into the Google search engine. My dealer is 50 miles away or thereabouts. Got this from an online supplier for a reasonable price.
On a leaking this or that, I give any equipment I buy a thorough looking over periodically and would have caught a leaking fitting.
I did change my engine oil and filter as suggested at 300 hours. I changed to Rotella T 5w-40 full synthetic. Mine has the Cummins engine (B 3.3NA). I called Cummins and asked what they thought about me using the oil specified for my first oil change. Their reply was "sir your engine will love for you to use said oil". So much for that. I have glow plug cylinder warmers for starting. After the warmup light goes out I hit the starter and within a second the engine lights off and another second the oil warning light extinguishes even down at the 10 degree F temps we had a couple of weeks ago.
I have $37,200 invested in my tractor and plan on dieing with it in my possession. I don't think I made a foolish choice in what I said above. Guidelines are generalities and one set goes out to every possible consumer regardless of usage. I took an oil sample and it was crystal clear with the orange tint (premium fluid) and no water. No particulates settled to the bottom of the test container. Why change it?
What they don't tell you in the maintenance instructions is to add a deionizing fluid to the radiator to prevent any corrosive effects of the coolant on the cylinders (pitting). I went to the JD dealer and got some for mine and added it when I changed my coolant. The other thing they don't tell you is to use deionized water for your cooling water if you live in an area with high mineral deposits. I have highly alkaline soil and it is in the water big time. So I use distilled water and 150k/5 year AF at 50/50......they do tell you to use 50/50 but don't specify any fancy type of AF.
My 2c and worth every penny you paid for it. Grin
Mark