Our 3000 did that, too. In our case, the seal wore a groove into the shaft.
The rest of the pump was in ok shape so I took the shaft to a pro machine rebuilder (they rebuild large industrial machinery). I thought they'd do the standard things - weld the groove & turn the weld back down.
When I got it back, I found they'd cut a wider groove, then built it up with a flame sprayed-on ceramic (hard stuff!), then turned that flush with the shaft diameter.
I asked 'em why they did it this way and they said it's been their experience that welding a small diameter shaft sometimes causes the shaft to bend slightly, and rebuilding and remachining a bowed shaft then becomes a game of tail-chasing. From the welding I've done, I instantly knew what they meant. They said the ceramic is so hard, I'd be dead before the seal wore a groove in that spot again. Cost was $150, info I gained was worth a lot more than that.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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