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Those ‘wobbler’ type pumps are among the simplest designs around, there’s not much to prevent them from working, other than excessive clearances – as others have noted.
I don’t mean to be insulting, but are you sure the little drive pin #550082 is in place? The pin is about 1/4" long, and inserts into the prop shaft. The eccentric #550085 then slides over the prop shaft, and has a machined groove to accept the drive pin. Finally, the rubber rotor (aka "wobbler") #550040 is fitted over the eccentric.
No pin = no eccentric rotation = no water flow. And they’re so easy to lose or just overlook.. Also, a missing gasket or intermediate plate will shut things down, too.