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There are lots of places. One being www.surpluscenter.com One example is a 13 GPM Parker pump for $80 at >Link You have to now the size pump (cubic inches or GPM flow rating), the direction it turns (clockwise or counter-clockwise), the mounting flange type (usually described as SAE 2,or 3, etc.), the shaft diameter and spline count or keyway type, and the port type (o-ring, pipe fitting, etc.). The 350 dozer uses a 13 GPM pump which is around one cubic inch, has an SAE two bolt mounting, and has a splined shaft. I don't remember if it's clockwise or counter-clockwise, you'll have to look. You don't have to buy a Cessna to replace it. Any gear pump will do as long as it's big enough, fits, and is rated for 3000 PSI. Often, places like the website I mention will charge more for pumps that are listed for direct replacement for Deere. You can't hurt anything by putting a bigger pump on the machine - but keep in mind with original Deere setups, a 13 GPM pump uses a smaller diameter pump drive than the optional 23 GPM setup.
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