So far, I haven't resolved the problem, and haven't had a lot of time to work on it.  Plus, haven't been able to connect up with John Schwiebert to get his thoughts.

I got a 3,000 pound guage as John suggested and put it on the flow divider.  

Right now, I've got the front weights (330 lbs) and the cast iron front grill off the tractor. Tractor is on a concrete floor. The interesting thing is that I don't hear or feel the &quot;chatter&quot; any more with the weights and cast iron grill off the tractor. 

With the tractor at 1400 RPM and not moving the steering wheel, pressure was about 100-150 psi on the 3,000 pound guage. As I steer either right or left, I get about 500 psi. When I get to the full right or full left position, I get about 1200 psi briefly.   I might could get more than 1200 psi if I held the steering wheel harder to the right or left.  The wheels always turn easily.

When I jack up the front end, I get about 200 psi as I steer either right or left. When I get to the full right or left position, I get about 1000 psi briefly. 

It doesn't seem like I'm getting enough pressure.  Don't know if its the pump, the flow divider, or something else......

RonnieS