Jim: As a recommendation, based on the above am thinking there is another issue to consider other than going after the pump as the primary suspect. This flows from the opening thought that indicates that the hydraulics were "plenty quick and strong".
An easy check would be to make a manifold using a Class A Glycerin filled gauge rated to 3000 psi to plumb into the outlet (pressure side of the pump) . Once this assembly is plumbed to the output circuit you could read and PSI of the pump discharge. Another good check would be flow in GPM. Again, a test manifold and meter would be needed.
From conversation with N. Swinford, the 615 LBH relied on a 25 gpm tandem pump for both the loader and swing, boom, dipper operation of the backhoe. That said, the pump supplied more than sufficient volume for good "fast" operation, and in some cases, depending on operator finesse, the swing movement would be too fast and cause a backlash at the end of the swing movement, thus shock moments that needed to be distributed to the balance of the machine.
That said. if the 615 backhoe is the same as the 650 backhoe and I think they are/were both Henry products then there is a detailed hydraulic system test procedure that covers your machine. Two important areas to diagnose would be the circuit relief valve and the anti cavitation check valve. I can supply the details of the test procedure if that would help - too many pages to describe here.
Please send me a PM and will share with you what I have. Hopefully, this will resolve the hydraulic issues with the wonderful 615. AFN...
Orangeman
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