You can't. That's the problem. Used pumps are a pig in a poke.
Then you usually pay 1/2 price of a new pump for a used pump with NO guarantee, and 9 times out of 10 they're just as bad as the one you took off. Now you get smart and buy a new pump, but you would've been way ahead if you'd bought the new pump in the first place.
This kind of hydraulic pump is two gears meshing together, a gear pump. Gear pumps get weak when the mesh of the gears gets loose, or the gears wear into the end plate of the pump, or seals/gaskets/orings allow pressure to escape past them.
New gaskets and seals may well be all your pump needs. For what it costs vs a whole new pump, it is worth it to try that route first.
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Today's Featured Article - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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