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Re: Ford 7710 PTO Gears Noisey

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07-29-2013 13:09:57

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Something just hit me...what rolling torque? If the upper 2-gear shaft assy is supposed to have end play, why are we checking rolling torque? Rolling torque is usually only required for shafts that have preload, and that one definitely is not supposed to have preload. As I recall, it's more like .003" end play.

Please clarify exactly what you did with regards to rolling torque.

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07-29-2013 13:50:27

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 Re: Ford 7710 PTO Gears Noisey in reply to Bern, 07-29-2013 13:09:57  
Quoting Removed, click Modern View to see

The manufacturer service manual said that the output shaft should turn with 0-5ft/lb torque. The endplay specification was .001-.029in for the upper shaft and .003-.005in for output shaft. Checking the torque to turn output shaft was the very last step for installation in the service manual.

Thanks for the input.

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07-29-2013 16:32:50

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 Re: Ford 7710 PTO Gears Noisey in reply to TCFarm2261, 07-29-2013 13:50:27  
Hmmm...I don't have a 10 series repair manual in front of me, however you may have mis-read something.

First, you don't check the output shaft (the 540 or 1000 RPM shaft) end play. Even if you did, you can't change it. I suspect that the .003-.005" end play spec is for tractors with single speed PTO, which you do not have.

Next, the .001-.029" end play spec is for the upper long PTO shaft that splines into the PTO clutch. This can only be checked with the top 3-point cover removed, or through the LH side cover.

Finally, the upper PTO cluster gear end play is going to be around .005", and not much more than that. If you have upwards of .030" end-play in that thing, that could well be the reason for your rattle.

I would STRONGLY suggest that you take another look at the manual to make sure you didn't make a big mistake. If everything is setup properly, there should be NO rolling torque of the final PTO assy (other than seal drag), assuming the upper drive shaft is not installed. If the upper shaft is installed, you'll be reading PTO brake band drag, which is going to differ depending on which output shaft you have installed.

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