Tip for under tractor inspection
I found a very useful way to inspect the underside of the tractor is to use a digital camera with a timer. Place the camera on the ground under the camera. Set the timer and take a picture. If necessary take several.
Load the pictures in a photo manipulation program and look at the underside of the tractor. Zoom into area you suspect the problem. If necessary go back out an re position the camera to get a better view of where you think you detected a problem
Sure beats standing on your head trying to inspect the underside to find the problem. The standing on your head time can be used to fix the problem not diagnose it.
You picture can also help you explain to the dealer what part you need.