Posted by Dave from MN on May 11, 2011 at 05:14:38 from (75.94.148.103):
OK, Measuring the pressure at the port at the rear bottem of the MCV where the orifice is. I have about 1500# max pressure when you are turning the steering wheel. Disconncting a power steering line mid point, we had about 1 gallon flow in about a minute turning the wheel one way, and probably close to 5-6 gallons if turned the other way. The gauge we used was a 3000# gauge. We connected the gauge to the port on the brake valve that goes to the right brake, started tractor and it did not seem to really make any noticeable pressure on this gauge, but yet the brakes locked up. How much pressure does it take to apply the brakes so they lock like this? We took the pressure regulator off another tractor and tried it in this one and there was no change. Please note, that when you start the tractor, there is SO MUCH pressure on the brake pedals that you can barely push the brake pedal a half inch. Please recall that this brake valve was tried on another tractor and worked fine after it had been rebuilt. I can not find anything in the IT manual about how many GPM flow should be to the brake valve from the MCV? I did replace ALL 8 return springs in the brake covers. If the return(dump) line from the brake valve is open all the way to where it goes into the tractor transmission housing, is there anything that could be restricitng the dump flow after that? This is so frustrating, every one seems stumped. Pulled the flow control valve last night again, wondering if that should be replaced or swapped.
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