The prefix letters are an important part of a John Deere part number, the part number is not just the digits you first posted.
A part number search for AM878392, comes up as a case kit for the 425 and 455 lawn and garden tractors. It is a kit, not one O-ring. That part number has been superseded by other numbers. Looks like major changes to do that.
If you want just the seal ring, can you get some bulk O-ring or quad stock and Super Glue and make your own? That is a stationary seal and other applications sometimes use bulk stock to make that type of seal. McMaster is one place that carries bulk stock and there may be supply houses near your that have it as well.
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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