Today I took my tractor out on the concrete pad in front of my garage for some lubrication maintenance. The pad was clear before I took it out there. Before I even started working on it, I noticed several parts underneath it. The parts are related and obviously the nut that holds them together is missing. I had a big job earlier this week moving a bunch of dirt to a neighbor about a half mile away. I'm not hoping to find the nut, which could have come off anywhere/anytime, but now I'm challenged with figuring out where these parts are missing from. I crawled under the tractor and spent about 30 minutes looking for a clean place that had recently lost a part. When I looked more closely at the parts, I noticed that they don't have the normal layer of tractor crud on them. They actually look pretty clean, and I did not clean them up for the photos. The assembled part has openings on both ends, but there is no channel completely through it.
I have not noticed any problems with operating the tractor, but these parts obviously cost something to produce and they wouldn't be on the tractor if they didn't have a purpose.
Thanks in advance for any help you can offer.