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John Deere 2520 Snapping noise in power train

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Jeff Lee

01-06-2002 10:55:03




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Friend of mine has a nice John Deere 2520 gas tractor with Synchro range trans. Releasing the clutch in any forward gear you can hear a single sharp snapping noise coming from somewhere in the drive train. Seems to be coming from under the seat, from the trans/diff case and possibly from the right side predominantly, although very difficult to isolate. After the snap the tractor appears to motor along fine under load. Stopping the tractor, releasing the clutch in any reverse gear the snapping noise is not readily apparent. Stopping again, selecting a forward gear and releasing the clutch we get the snap again. It seems you have to go forward to reverse and back again to get the snapping noise. We've raised the rear wheels one at a time and rotated thru several revolutiions, forward and backward, all seems smooth. Jerking the wheels rotation back and forth there is a backlash but difficult to tell what would be considered normal or excessive. Any history of drive train troubles on this model JD? Any ideas appreciated. Not a JD expert mysellf, I've told my friend he could likely continue to use the tractor as is. It's done this since he bought it and who knows how long before that. If it stays the same no-big deal. If it gets worse the source may be more easily detected. His fear and rightly so, is possibly major damage. Anybody comment on this piece of advice to continue to use the tractor? If the problem is in the differential pinion and ring gear were looking at a major labor and parts fix.

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John in Md.

01-07-2002 11:36:50




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 Re: John Deere 2520 Snapping noise in power train in reply to Jeff Lee, 01-06-2002 10:55:03  
I have a 71, 2520 that does the same thing,but not every time.Cones and locks are tight on wheels,like you said it sounds like the noise is inside the rear on the right.We also have a 69,2520 that doesn't.If you decide to open it up or if it just lets go post a followup with the cause.



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WTW

01-07-2002 08:07:26




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 Re: John Deere 2520 Snapping noise in power train in reply to Jeff Lee, 01-06-2002 10:55:03  
Jeff, The snapping noise that you are referring to may be wheel or axle clamps loose but probably not. The noise common to many John Deere tractors with final drives especially ones with allot of hours on them is coming from your final drive ring gear. The ring gear is retained in the final drive housing by an interference fit and keyed with three dowel pins to keep it from rotating in housing. Ring gear teeth are on the inside diameter of gear and the dowel pins that key it to housing are on the outside diameter of ring gear. Tractors with allot of use epically ones that has seen allot of loader work will cause the ring gear to work inside the final drive housing. Torque on the ring gear is reversed when changing direction of tractor, ring gear tries to rotate one way and then the other when direction of tractor motion is changed. The dowel pins on the outer diameter of gear keep it from rotating in either direction but the slack wore into final drive housing, dowel pins and ring gear is taken up each time there is reverse torque applied to it and when it does it will emit a crack or snapping sound each time. It may be one or both final drives doing this. The good news is it will not hurt anything but it will make a snapping noise. I have never seen a final drive fail in this area do to this problem if you want to call it that. It could probably be corrected if one had his heart on it but all you will gain is the absence of the noise. Hope this makes you feel better as it should. There are thousands of tractors out there that do the same thing. Dave W.

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Jeff Lee

01-06-2002 16:18:03




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 Re: John Deere 2520 Snapping noise in power train in reply to Jeff Lee, 01-06-2002 10:55:03  
Guys: Thanks for the responses. Looks to be a common problem. We'll tighten all these bolts but I can see that if the key and/or keyways are worn we may not eliminate the problem.



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mrm

01-06-2002 13:55:24




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 Re: John Deere 2520 Snapping noise in power train in reply to Jeff Lee, 01-06-2002 10:55:03  
Jeff: I've had same problem with two-cylinder and
4020 tractors. Most of the time it is a loose rim
clamp or axle clamp. Tightening may not solve as
axle wedges or rim,rim clamps may be worn.



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Red Man

01-06-2002 13:13:16




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 Re: John Deere 2520 Snapping noise in power train in reply to Jeff Lee, 01-06-2002 10:55:03  
I had a 4020 and still have a 3020 Diesel and they both do the same thing, never gave any trouble.



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DON

01-06-2002 12:16:30




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 Re: John Deere 2520 Snapping noise in power train in reply to Jeff Lee, 01-06-2002 10:55:03  
I suspect he has a loose wheel on the axel also check the outer rim clamps. Don



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RUSSELL

01-06-2002 14:53:11




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 Re: Re: John Deere 2520 Snapping noise in power train in reply to DON, 01-06-2002 12:16:30  
I HAVE A 4010 AND IT DOES THE SAME THING. I CAN NOT FIND ANY THING LOOSE ON THE WHEEL OR RIM. WHEN YE FIND OUT EMAIL ME BACK. IM IN BOWLING GREEN KY



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DON

01-07-2002 12:19:27




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 Re: Re: Re: John Deere 2520 Snapping noise in power train in reply to RUSSELL, 01-06-2002 14:53:11  
Take a water hose and wet down the rim clamps. Let them dry and then look for rust streaks coming from the clamps. They dont have to move much to pop like you are hearing.Don



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