Very clear and concise answer to about 95% of gear pump seal failure, the one thing I may add is IF the housing is so worn that internal pressure will build to the point that the seal are blown. Just like Jan says most common is pump put together wrong but if the end plates or housing is worn those seals are not made to hold pump pressure.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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