I have had the same problem with my 4020, snagging the rain cap on a branch and pulling the muffler off. First time it broke the muffler off at the base, which was better than breaking the manifold. I have rigged a solution that is not perfect, but helps prevent serious damage. The tractor is at the ranch so I don't have a photo, but here's what I did. 1) I got a piece of exhaust pipe, about a foot long, to go above the muffler. One end was expanded so it would slip over the pipe exiting the muffler, but I added some slits to that end so that the fit was not as tight. It has a rain cap flapper on the other end. 2) I got some springs with elongated hook ends. I use McMaster - Carr 96605K26, 3 3/4 long by 0.563 OD springs, part # 96605K26. see D in the attached photo 3) I got a hose clamp, Constant Tension 316 stainless steel bolt clamp for 2 7/16 to 2 3/4 hose or tube, McMaster part # 5276K31. See attached photo. You may need a different size depending on your muffler pipe diameter. 4) A regular hose clamp goes around the pipe exiting the muffler, with 3 springs hooked to it. 5) The hose clamp with built in spring goes around the extension pipe, at the slits, with the springs hooked to it. 6) Now the extension pipe is a lose fit on the muffler, but the springs keep in in place. I get a little exhaust leaking through the slits, but it is minor. Now if the rain cap gets hooked on a branch, or of a branch hits the extension pipe, there is enough give that it just pushes the extension to the side, or pulls the extension pipe off the muffler, and the springs keep it from falling off completely. If it gets pulled completely off, the springs will stretch and be ruined, but that is better than breaking the muffler or manifold. This set up is far from perfect, but it has prevented more serious damage as I manage to snag a branch about once a year. I have extra springs on hand so it is a quick fix to get back to work.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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