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JD70 governor

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Dave2N

02-17-2000 16:09:36




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Need some help or suggestions. I have a 70 gas and among other things we have done to it is rebuild the carb and the governor. It starts great and the timing is right but still surges and at times when under load, it "sticks open" (revs) and the linkage binds somewhere. I can't get it back down without actually shutting it off. It never does it going down hill or when it's not under load. One suggestion was to shim the governor cover. Yes? No? Any other help or suggestions will be appreciated.
Thanks.

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Dave2N

02-18-2000 04:56:21




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 Re: JD70 governor in reply to Dave2N, 02-17-2000 16:09:36  
Thanks for the help. I guess that gives me a few things to try this weekend. If I need more info, I'll get in touch again. My grandfather always said "The man who knows he doesn't know it all, knows a lot." So I'm not ashamed to ask for help.
Thanks again.



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Jack

02-17-2000 18:13:17




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 Re: JD70 governor in reply to Dave2N, 02-17-2000 16:09:36  
Sounds like the slide or weights are sticking on the governor shaft.Be careful if you do try to take the governor gears off the shaft.I ended up breaking the outer gear trying to take it off and nothing moved,even with heat.And the dealer can't get them gears anymore,or shafts.Good luck,Jack.



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Gman

02-17-2000 17:52:30




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 Re: JD70 governor in reply to Dave2N, 02-17-2000 16:09:36  
Dave2N-Looks like you got some pretty good info. I've rebuilt 70's and "G's" I always take the govenor out of housing and check pins in the weights if worn I replace(suckers are high)also the little slide that operates the weights will get gummed up and cause some sticking,take apart and clean and polish shaft and inside of slide assembly.On the end where the distributor or mag goes(got a big spring on it) there is a bearing under this spring that is often neglected because it is hard to replace,got to do some pressing to get off shaft,if you massage this rascal as these post say your 70 will smooth out. Later Gman

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clooney

02-17-2000 17:09:17




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 Re: JD70 governor in reply to Dave2N, 02-17-2000 16:09:36  
Dave, work the linkage by hand with the engine not running & see if you can find the bind. If that dosn't find it disconnect the linkage at the carb and work the carb by hand to see if it is binding inside the carb ( throttle plate binding in the bore) Then look at the top of the carb where the linkege goes into the throttle lever to see if the rod is going into the throttle lever too far & binding on the top of the carb ( also make sure the cotter pin isn't hanging at the top of carb where it goes through the rod. Adjust the throttle rod so that the rod is 1/2 hole short when the speed control lever & throttle butterfly are wide open. If you still havn't found the problem you can remove the govenor weights & shaft with the govenor still in the tractor by removing the l/h cover, then remove the govenor arm on top of the govenor, then turn flywheel until the governor weights are on top & bottom. After removal check all the parts against the parts book & service manual for proper assembly. Don,t shim the govenor cover, it will change the fan gear backlash. The r/h govenor shaft bearing tends to wear the bore in those 70's & become quite loose. If thats the case E-mail me & I will explain how to move the bearing into a good part of the bore using an old bearing for a spacer.

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Spokerd1 Sounds like

02-17-2000 17:02:43




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 Re: JD70 governor in reply to Dave2N, 02-17-2000 16:09:36  
You have weights that are sticking. Yes you need the govenor cover shimed correctly for the Distributor or Mag to work correctly. If you did not have it shimed at all, then you would try to push the Mag or Dist. off the Govenor, and if it was a Mag the impulse would not work. One other thing if the throttle rod does not move freely when the tractor is NOT running you could have a binding throttle rod. It might be rubbing some part of the tractor.

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