I have a Bobcat that I always thought was an M610. It was originally yellow, had no cab, and ran on propane when a friend of mine bought it used. I also think it had solid tires for indoor use. I've always worked off the 610 service and parts manuals for various things, even the later version of the rotoswivel, as well as maintenance parts. I have new tires and a homemade cage. Here's the odd thing. I'm fixing a front axle leak and so I need new seals. The typical number is 6515000, which is a seal for a 2 inch shaft. But the shaft section for the seal on my machine is 1-7/8. I'm glad I didn't order the seals until I got the old ones off. (They are CR 18823.) So clearly my machine doesn't completely fit the 610 parts manual. Can anyone suggest what my machine actually is. I even went to lower numbers on the bobcatpartsonline catalog, but every one I looked at used the bigger 6515000 seal. The bore for installing my seal is the same as with this other seal, 3". I once wrote down that I had model M610 with serial number 210894. (Not sure where I found that on the machine.) That kind of serial number doesn't even seem to fit the online parts site's options. What do I own? Thanks for any help.