It is supposed to be a closed, constant volume, system. The internal cylinders in the reservoir have fluid that follows the piston into the cylinder, thus displacing as much as used. The rear cylinder is also 2 way, putting almost what is used to extend back into the res. Piston rod differential is all, which should be a partial vacuum when extended, and zero sum when lowered. Many seals leak dramatically when under near zero pressure, but seal well when loaded in use. I think this is your issue. Any oil leaking out of the piston rod is getting past the seal there. If it does, it could be the reason other factors are appearing. If the rear cylinder control valve is not centering exactly, or is leaking, the hitch pressure could cause oil to be displaced back into the reservoir, with no oil going to the other side of that cylinder. This would pressurize the reservoir, and push pressure into the pump suction side (pushing on the seal on the pump shaft.) If it were mine, I would put a 1/4 turn hydraulic rated valve in the bottom of the rear cylinder. When I shut it off, I would close this valve. If all symptoms stop, I would look to those seals and Orings in the cylinder, and in the hitch control valve. Keep us informed! Jim
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Today's Featured Article - On the Road with Dave Gohl: Tractors and Farming - by Dave Gohl. I never thought I'd live to see the day, when I could call myself a farmer. What allows me to say this? Well, when our family moved to our 20 acre site near New Prague, Minnesota, I had one thought in mind. You guessed it, farm it somehow. A little history is in order. In my younger days, mom, dad and my brother made frequent visits to dad's youngest brother Pete, who took over the home farm from grandpa MIke. It was the typical set-up, milk cows, pigs & chickens. In the winter, we'd play
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