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 - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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