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210 variator adjustment bolt slipping?

1671 Views 5 Replies 6 Participants Last post by  Stevens110
Hi all,

New to the forum and new to the John Deere community with a 1980 210. The tractor is in good shape, but I have been going through it to make sure there aren't any loose nuts or screws and that the belts are adjusted appropriately. I adjusted the variator based on the instructions in the service manual and all seems fine. The tractor moves through the gears and with the variator in the first (slowest) notch. However, I noticed that the bolt that is used for the variator adjustment seemed to slip upward after running the tractor. I am pushing the bolt down as directed, so the bolt is tightened in the lowest possible position after the adjustment. I am wondering if this is normal. If this is not normal, what is the torque spec for this bolt? I haven't been able to find any information about how tight to go with that bolt. I feel that I am tightening it down pretty good but am not using a torque wrench.
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DF, I'm not familiar with the 210, so I can't give you a Deere spec. However,you can determine the torque requirement yourself !

Remove the bolt and identify the size (O.D.) and threads per inch. Next identify the grade of the bolt. Look at the head of the bolt, count the number of lines, add 2, and this is the grade...no lines, add 2, grade 2 bolt, 3 lines,add 2, grade 5 bolt. Finally, search online for a torque chart. This will list the torque required based on grade, size, and threads per inch. Bob
does the adjustment bolt have a lock washer or star washer on it?
the lock washer should stop the bolt from slipping.

do not forget the lub the variator pivot bolt and apply some graphic power the the variator
Not sure about the 200 series GTs but there is no torque spec in the service manual for the 110/112s. I know the bolt moves a little bit on mine after adjustment, so it may be normal.
Does the variator work OK after adjustment? If not, you may have to adjust variator spring tension also. The procedure for that is in the SM also.

As others have mentioned, make sure the star washer is present. Here is a picture of how it should look.


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