Posted by JerryF on February 12, 2008 at 19:52:50 from (75.88.91.214):
656 Gear drive. Back pump works fine, but front pump bare puts out enough pressure to lift loader if engine at WOT. Power steering works, but doesn't quite seem 100%. I changed pressure relief valve and font pump from a donor tractor, that I know were good. After changing pump and relief valve, pressure is around 800psi at the couplers. The inside control valve sticks (almost locks at open or close) and just doesn't seem right, but the second is smooth. Pressure out of each is around 800. Could the problem be the contol valve or is it more likely the stering proportioning valve or a suction tube inside? I am fustrated, thanks for your help.
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