On my TD340A I have the main 3 spool valve and then a valve near the back that is used for a scarifier. I had to put a diverter in the line to the back to change over to a detachable backhoe, which had its own controls of course. You really have to think through the plumbing carefully, and especially understand the logic of the return lines. Unless the valve is completely shot, you should be able to get some pressure. Regarding the flow, you should be getting at least 12 gpm from your pump and possible more (dpending on how the machine was configured), at a pressure of at least 1200 psi, maybe up to 2000 psi (I can't remember). Compare that with the requirments of your new device. It might have the power but just run slow. I upgraded my pump (easy to do) to run the backhoe faster.
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