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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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