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Shimmy Mystery Solved

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I have been trying to figure out why our Cherokee 140 shimmys. We replaced the nose wheel, shimmy dampener and torque link bolts. Could not find any reason. It would shimmy when not enough pressure was on the rudder pedals when taxiing fast and reducing the throttle. Happened every time. My mechanic said that he had fixed 3 Cherokees with the same problem by tightening the nut on top of the front strut. I had nothing to lose so we removed the steering yoke and we got about 1/4 turn on the nut. Also, the bolt holding the steering yoke on was lock-wired but was not even finger tight. The lock-wire for the bolt is supposed to go to the nut but it was going to the yoke arm. Put everything back together, made sure everything was tight and lock-wired properly. Problem solved!! I intentionally tried to make it shimmy but could not get it to no matter what I did :)

I have read many threads on this issue and have never seen this as a possible cause. I thought I would share it in case someone else is fighting the same battle and done everything else.
 

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