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Years ago at the last Deere dealership I worked at, we stocked up on the older and discontinued headed master-pins - and used them on the newer tracks when they got worn. But, I don't think you can get them anymore, so welding in the pin will be necessary. Of, if your track is just a little worn, a standard track pin might work. The new-style master pins (with the dimple mark) are a little bit smaller diameter than the standard pins - so they can be removed. So, a standard pin is slightly larger. Also, some people just weld up the OD on the original pin and make it fit tighter - instead of welding. In regard to the track-adjuster seals - buy them from Deere. But, figure out what you have first. Most of the older crawlers ought to be converted to use the newer seals. If you buy the original type seal, the adjuster probably won't hold and you'll be pumping grease into it all the time. If your adjuster piston is still original - is uses either an o-ring and backup washer, or a black rubber square sided sealing ring. When the "C" series came out, a hard, semi-clear lipped seal got used and it works much better. To use it on an older piston, you have to remachine the groove.
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