What is "TVA" ? Just curious, government agency ? Hours seem low, but sometimes turn out legit, most times not, good to keep in mind, that and the fresh paint. Not the most qualified to comment on this, but that adjuster is probably the least of your woes, do use care around the recoil spring when replacing it, assuming this one has the large spring like the old ones did. Get the operators instructions, serviceman's reference book and parts catalog for it, will be very helpful and or necessary for repairs, books should match the serial number of the tractor. The grease, first thing that comes to mind is a leak in that final drive compartment, at least it was not run dry, (hope that is the case). Not sure how you can determine what is going on in there unless you flush out that grease and fill with oil again, look for a leak, check for metal chunks at the bottom with a magnet, pry against the sprocket to see if it's loose on the dead axle, listen for noise when moving the tractor, worst case is you'll have to break the track, pull the sprocket and get look inside to see if any of the gears, shaft or spines are damaged, also replace necessary seals, which may be the source of the leak. Check the final drive case for cracks, something is awry there if it's got grease in it. Hopefully you got it real cheap, final drive repairs can be costly.
Again, this is rank amateur advice from someone who has operated more than worked on these, so take with a grain of salt.
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