I had similar problems with my power steering on my 656 and had leaking seals on my draft and lift control levers. I was told to remove the pipe in the left front under that plate to lower the fluid level in that cavity and then to over fill the fluid level by 5 gallons in the event that the seal in the clutch housing might be sucking air and causing the pump to cavitate. What I did was remove that Bull Plug that you referred to as all I could see that it was was a drain plug there was nothing behind it and over filled the fluid. The leaking has stopped, the cavitation has stopped and the power steering now works. I dont know if will fix your situation but it is worth trying.
Joe
PS. Can you turn your steering wheel while your engine isnt running? Mine would just spin with absolutely no resistance whatsoever until I did what I said up above.
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Today's Featured Article - Two-Brush Generators - by Chris Pratt. Whether for product liability or because the aftermarket parts and labor business is lucrative, this concept is disturbingly prevalent. Fortunately when you step into your shop and make that jump 50 years back in time to work with your old tractor, this concept goes out the window. Even so, when it comes to the charging system, people quickly revert to this idea and start replacing the major components one at a time until it works. The reason you don't find any decals in your replacement set wit
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