Hydraulic Pump Mounting

[engmoh4u]

I have a power pack with perkins 1104 diesel engine. An air compressor attached to the engine. I need to fix a hydraulic pump to the back of the compressor but I don't know the type of pump drive shaft should I select.

 

[oldnslo]

That is European 52 mm pilot with tang drive style. Not real common in the USA but should be available from most gear pump manufacturers like, Parker, Honor, Marzochi (spelling), Rexroth. Suspect that there should also be some form of coupler that goes between the pump and the air compressor but not 100% sure.