I had the hydraulics quit on my 801 diesel and here is what I found. My tachometer stopped so I knew the problem was at the pump. The inner splines on the drive gear had stripped. The parts man at the dealer has been around forever and he informed me that worn timing gears causing too much backlash contributes to this and the diesels are much worse than the gas models. With the problem I had getting the timing right after a fuel pump overhaul, he may be on to something. This winter I'm going to tear the front off the engine and see what kind of shape the gears are in. This tractor has been in the family since 1971 and never been apart. Sound likely I think. Hope this helps someone.
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