Posted by gbs on March 10, 2021 at 20:08:47 from (71.217.169.122):
we have tractor with a ccls pump that once you move any of the controls signaling the pump thru the load sensing compensator valve to meet the demand for that circuit up to 2800 psi it will not return to stand by pressure of 350-400 psi, after a barrage of system test the pump was rebuilt even though there was almost no signs of wear, put on a test stand and checked during which time the compensator valve was replaced as it was doing the same thing while on the stand. The replacement was a used one that worked correctly until it got put back on the tractor, so a new OEM one was installed it worked about 6 times correctly but the max pressure had to be lowered, after that adjustment then it started locking in demand not returning to stand by. All three of these valves have had the signal line opened via a line and screw valve connected a tee fitting at the X port of the compensator valve when the pump was locked on demand to insure there wasn't pressure present, even though there was 0 pressure at the X port of the compensator valve the pump stayed on demand until the engine was shut off, part of the time it would still be on demand after restarting the engine. Also if the max pressure valve is adjusted the pump pressure will adjust accordingly. Is it possible to have 3 bad control valves in a row or have I missed something?
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