I just finished adding quick couplers and a rear cut off valve to my 425. Six separate connections and no leaks...better than average for me! I also removed the deck to clean it and sharpen the blades. I was a little bit concerned about this process but it proved to go fairly well. My old 48C deck was belt driven and I have never had shaft drive implements before. It was obvious that the previous owner didn't have it off too often as there was a lot of hardened build up on the underside of the deck and the blades really needed a tune up.
This is all new to me as I just bought this tractor a month ago. My old tractor was a 325 and quite a bit lighter duty than the 425. See my "for sale" thread in the "swap shop" forum. 325 Serial Number "1" with a Tiller, Blade & Snowblower.
I still need a set of wheel spacers before next winter. If anyone knows where I can locate a used set I would be grateful for the information.