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Hank: When the rockshaft falls that rapidly after raising, typically, the gasket between the rockshaft lift cylinder and the rear cover is blown. It's not a complex job, but can be complicated if you have problems removing the piping, and hoisting the rear cover which can be pretty heavy and awkward. Drain rear-end fluid (good time to flush and re-fill if needed. Flush with diesel fuel is a good thing. Remove the pressure and return piping from the Powr-Trol pump. DON'T DAMAGE THESE TUBES....THEY ARE NO LONGER AVAILABLE. Remove all the cap screws and lift the cover off. While you have the cylinder off, install a new o-ring on the lift cylinder piston. Use a good shellac or permatex sealant on the rear cover gasket because you don't want it to leak. I like to use two pieces of threaded rod to use as guide pins when sliding the rear cover back into position. If you don't have a manual, at least have your dealer print you out the page or two from the parts manual. P.S. If you have ever noticed that the pto cluch housing get over full or looses oil, it can be because the pto has a gear pump in it for clutch lubrication, and a seal in it might have failed. It is very easy ro replace this seal while you have the rear cover off. FYI... Hope this helps ! Frank-in-Tallahassee
70D // 855
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