Question about hydraulic pump mounting on flywheel side of engine

[GlennsM444]

I have a question about hydraulic pump mounting on the flywheel side of the engine. I finally broke down and repowered my M444. I found a sweet deal on an 18HP Vanguard engine locally and after some rigging, the new engine is installed. All I have left to do is attach the hydraulic pump on the flywheel side of the engine. The old Onan had some sort of coupling setup bolted to a pulley and then to a flywheel. This coupling type attachment consists of 4 bolts into rubber mounted bushings that just spin in circles. The whole assembly is somewhat flexible too. Looking at it I'm amazed the 3/8 bolts haven't snapped over the years. Anyway, my question is, can I just omit this little flexible coupling and rig the pump directly to my stub shaft? Will all of the vibration from the engine damage my hydraulic pump?

 

[Tazza]

I think you really want a flexable joint in there somewhere, just in case it's not spot on straight. I'm not sure the vibration would be an issue so much, but you want some movement just in case.

 

[GlennsM444]

I think you really want a flexable joint in there somewhere, just in case it's not spot on straight. I'm not sure the vibration would be an issue so much, but you want some movement just in case.

I did some reading and learned what I'm looking for is a lovejoy coupling. My stub shaft is 1'' with a .25 keyway; the shaft on the pump is some splined star type. Anyone have an idea what they call these types of shaft? I'd like to mate the ends perfectly, with hopes a nearby industrial supply store will have both female ends that can unite. gc