cleat 4,896 #1 Posted July 20, 2018 I always wondered how the rear axle vented on my 520's then it dawned on me. It is through the dipstick. If you have a 520 or any other Wheel horse with the Eaton 1100 transmission and are having trouble with fluid puking out of weird places or blowing out seals then check this. I found one of mine quite restricted this morning. To check, simply pull the dipstick then check the end of the curl on the handle. You can see where it has been flattened a bit but there are two small openings. Clean these out then blow through it. It will blow through quite easily when it has been properly cleaned. Cleat 4 3 Share this post Link to post Share on other sites