Are you trying to install a hydraulic pump? I've got a later model Cummins and the hydraulic pump is driven off the gear box (ZF in my case). The engine's gear driven PTO is already taken up by the raw water pump.
The hydraulic pumps I've seen, which is a few but not a million, are all gear driven, usually off the transmission's PTO. I suspect they are not belt driven because they are too big of a load.
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