Pump on a dump trailer

Hey all,

I just bought a Dandy Dump 5X8 trailer in really good condition but it has a bad 12 volt pump and motor. I"ve been lookin" at new Haldex 12v pump setups and can"t swing the $350 to buy one. While looking at used ones on ebay, I came across several hand pump units for under $100 like the one in my link. Would this work, and, more important, am I gonna be pumping it 500 times to dump the trailer?

Thanks for any input.

Thanks for all the input. The Greenlee 767 looked promising but it looks like they consistently sell for over $150. According to Paul's calculations, my 3X16 cylinder has 36 cu in of oil capacity. The Greenlee pumped at .82 cu in/stroke. By those numbers, it would supposedly fill the cylinder in 45 strokes. I never could find reservoir capacity but it looks a bit short on that front. I wonder how much force I would need to operate the pump...

I think I'll keep up the search for a 12 volt unit as suggested. Any good idea on where to find a good, used one? I've seen some out of lift gates off the back of trucks from Texas on Ebay.