Hydraulic Pump, PT convertible

Dismantled back seat area, got leaking cylinders out of lift mechanism(cleaned up oil puddles etc) sent cylinders to Top Hydraulics for rebuild. In meantime fired up pump and hydraulic lines spit air and oil telling me pump still worked...or so I thought. Got cylinders back, re-installed same, added oil to pump and let-er-rip. No movement at all. Can hear pump running, reservoir level dropped a little, added oil and still nothing. Loosened screw at bottom of pump to relieve pressure and cycled the top by hand a few times. Tighten screw and tried to cycle top by hand, felt resistance at about half way indicating oil (and air?) in lines and turned on pump...still nothing...pump runs but no movement. Can cylinders be mounted wrong? Watched videos on YouTube and closely watched as cylinders were removed with piston end to front of vehicle. Installed mine just like that. Do I have a crappy pump? Anybody out there got any info? Any and all advice/help greatly appreciated.