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Ford Tractors Discussion Forum
Order Ford 640 Parts Online

640 PTO jumps out of gear.

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pburchett

02-10-2019 16:35:57




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The 640 PTO jumps out of gear. While cleaning out the hydraulic section I took the PTO shifter rail apart. Looks a little worn so I turned the rail over and stretched the detent spring a 1/8 inch more. It was a tough little spring.
Put it back together and it seems as if it is now harder to engage and disengage the PTO. Maybe this will fix the problem.






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pomester

02-11-2019 17:40:38




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 Re: 640 PTO jumps out of gear. in reply to pburchett, 02-10-2019 16:35:57  
the bearing should be tight between the collars - I can see ~3/8" where the shaft is free to slide thru the bearing - I use heat to expand the collar so it adjusts easily -
at this point, make a critical evaluation of the bearing and collar condition - neither are particularly expensive and it would be easy to replace both plus the seal now -
David



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pburchett

02-11-2019 17:28:15




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 Re: 640 PTO jumps out of gear. in reply to pburchett, 02-10-2019 16:35:57  
Quoting Removed, click Modern View to see



I guess this is the retaining collar I have marked with the arrow. I will look at the internal end of the PTO shaft tomorrow, but I did not notice any wear when I took it out.
The other end shows some wear but I believe it is from the over run coupler. I will check the end play when I put the shaft back in as I am waiting on parts from YT. I think Washington / Idaho had some bad weather which is delaying my parts.

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soundguy

02-11-2019 08:29:13




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 Re: 640 PTO jumps out of gear. in reply to pburchett, 02-10-2019 16:35:57  
Ditto what Pomester said. make sure there is no thrust play.. that will walk them out of engagement, and mushroom the end, and chew the splines

Post back.



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pomester

02-10-2019 16:41:14




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 Re: 640 PTO jumps out of gear. in reply to pburchett, 02-10-2019 16:35:57  
check for end play of the PTO shaft - if it is excessive it will cause the PTO to jump out. It is controlled by the retaining collar near the bearing.



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