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Why does John Deere model js40 vibrate?

Updated: 8/19/2019
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Q: Why does John Deere model js40 vibrate?
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Most reliable lawnmower?

Well I had a TroyBilt something or other. The 1st one broke down within 30 days so I brought it back to Lowe's and they replaced it. The next one lasted just over a year.The next lawnmower I bought was a fairly expensive John Deere JS40. Nothing but problems, with both the self propulsion system, and with the lawnmower not starting.On both models, I changed oil, changed/cleaned air filters and spark plugs, and on the Deere' I've pulled apart the carburetor twice to clean it and put it back together, only to have the lawnmower work for another week or two.I don't mow lawns for a living, and my yard is not very big. I cut it once/week during the summer, I don't let gas sit in it throughout the winter.I will never buy an American brand lawn mower again. I guess I'm off to shop for a Honda.


How do Ireplace the drive belt for a john deere js40?

Just replaced one. First, disengage the tensioner spring and remove the two gold colored pulleys being careful to note how the spacers and guards are on them. You'll probably have to block the tensioner with a piece of wood or something to get enough torque to undo the nuts on the pulleys. You do not have to remove the black pulley. Take a picture if you can for later reference. You'll also have to unbolt the steering arm where it attaches in front of the left front tire. Disconnect the P.T.O. power connector. Then slip the belt up and off the back pulley to where it's between the pulley and the fan. Then pull it out so you can get it off the P.T.O. pulley. To install the new one start with the rear pulley first and get the belt over the fan blade and above the pulley so you'll have enough slack to slip it over the P.T.O. pulley. Then put the belt on the fan pulley. This is a pain but I turned the fan by hand to get the pulley to turn and seat the belt. Be careful you don't break the fan. It would be a major dissassembly to put a new one on. Once you get it seated you just replace the pulleys. Hook up the tensioner spring and reconnect the P.T.O. power connector. It was a pain but, saved me about $90.00 by doing it myself.