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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
... [Read Article]
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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