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Message: <blockquote data-quote="mrfixer" data-source="post: 130613" data-attributes="member: 23736"><p>I have a Melroe M-444 from around '63-'65 era.  My unit was completely not operational when I bought it.  I've pulled out the seized engine and are looking for a replacement.  While I'm looking, I wanted to see if there is a way to test out the hydraulic system.   If I could spin that pump shaft some way, perhaps it could pressurize the system so I could check for leaks and see if the valves are operating the cylinders, etc.  I don't know if they are operational or not.  I have a 2Hp 220V electric motor from a Jet mill that I'm thinking of rigging up to power that pump.  It spins at 1750 rpms - this should be a safe range for that pump.  I don't need to run it long, just enough to check the movement of major valves and levers.   Will that work?  Thoughts, cautionary tales, etc</p></blockquote><p></p>