First, before I forget, pic #4 & 5 seem to show missing threads in the stud-hole on the "left" (can't tell if that is the top or bottom, I think top).
The gear on the compressor doesn't look too bad. If the compressor itself is in good condition, considering the cost of a rebuilt one, I would personally take a small fine-tooth metal file and make sure the surface of each and every tooth is smooth (thoroughly clean all filings off the gear with a soapy solution - let none get back into the motor). The little groove that got cut out shouldn't hurt too much.
But then if you have any signs of oil coming out of the wet-tank air/water-release valve, maybe it's time for a new (rebuilt) compressor anyway. My "new" one is much quieter, also.
I would guess that the corner edge of the motor's drive gear caused that groove. I would look carefully at that. Turn the crank by hand little by little if you have to, to see every tooth. Again, small imperfections can be filed down (use a magnet to catch the filings from going into the motor, and again, wipe the gear with soapy rags to make sure you get all filings out)
I can't tell for sure, but it looks to me (on my motor and your pics) that the motor's drive gear spins the compressor gear, and the compressor gear spins the other gear. That other would be my high-pressure diesel injector pump. Not sure if that is your injection pump also. Seems like that would cause the motor to stop if the compressor gear disengaged from the injector gear.
But all that means you should check that other gear also. I'm not sure if you could get it to spin by hand (or with a pry-bar or screwdriver acting as a pry-bar).
Good luck!
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