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Dan,  your problem sounds very similar to some that were reported here some
time back, the solutions to which typically entailed the rebuilding of one
or more cylinders in which the internal seals had failed.  If he seals that
separate the high side of the hydraulic system from the low side fail the
one will feed into the other and your pump will continue running
incessantly.  This could be caused by the either the seal that surrounds
the piston or the seal under the nut that locks the piston to the rod
having given up the ghost in one or more of your cylinders.  The best test
is to isolate each cylinder in the system one at a time until the hydraulic
pump operates as it's supposed to.  I would perform this test prior to
removing the pump from the system, if for no other reason than to eliminate
a failed cylinder seal as the cause of your problem.  You should also do
the same thing with your dump valve, as even though it's the new 5kpsi
unit, it is possible that one of its seals may have failed as well.  If,
after you've isolated all the cylinders and the valve, your pump continues
to operate, you can feel pretty sure that that's where the problem resides.
Please let us know how this works out.

  <Marv>

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