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JD70 clutch governor

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ToddF

01-22-2002 08:35:34




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I have JD70 gas that has a couple of quirks that have popped up recently. First, with tranny in neutral and clutch engaged, when the clutch is disengaged it won't release unless the engine RPM's are decreased to darn near stalling, the pulley brake won't stop it. If the tranny is in gear it seems to provide enough resistance to the clutch that it will release when the lever is pulled back. Does anybody know whats going on here? Second, I put a carberator kit in it last month and started using it to plow snow. Now the governor seems to have slow response. I adjusted the power valve setting some and that seemed to help quite a bit, but it still seems to react slower than I would expect. It is slow to pick up under loading and slow to cut back upon removal of the load. What should I look for? I'd be thankful for any help. ToddF

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buckeye al

01-25-2002 09:37:45




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 Re: JD70 clutch governor in reply to ToddF, 01-22-2002 08:35:34  
Todd.... Before you tear you clutch all apart check out how weak the three release springs are right behind the outer ring of the clutch. I think you'll find that these three springs have rusted away to shadows of their original selves & when you pull back on the clutch, they're not strong enough to "open up" the clutch pack releasing the clutch. They're good cheap insurance for safe operation of the clutch. I just put a new set in my 70D which was doing exactly what you describe.

Later.

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Pete

01-22-2002 18:26:08




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 Re: JD70 clutch governor in reply to ToddF, 01-22-2002 08:35:34  
Todd, Sounds like everyone is on track here, adjust the pulley brake, and think carb, not governor. I rebuilt the carb on our 70, and then chased the governor for weeks, completely rebuilt it, even honed and replaced the bearing on the back side, but it didn't seem to work. Finally, a guy who had been telling me it was the carb all along,(I wouldn't believe him 'cause it had a new kit in it) took the carb and went through it again, using the original rod...wa la...runs like a top! On the bright side, I'll never have to go in the governor again! Pete

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Deere Puller

01-22-2002 15:52:15




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 Re: JD70 clutch governor in reply to ToddF, 01-22-2002 08:35:34  
As for the governor / throttle response problem, make especially certain that the throttle butterfly opens and closes with NO effort. Typically, the rubber seal is a tad tight causing the shaft to bind. If you used a 'TISCO' or equiv. carb kit, with a new throttle shaft, take the new one out and replace it with the original. Those shafts are usually have alignment problems via bent shaft or over-wore bushings in the carb. If you replaced the bushings, don't be afraid to ream them gently. I'd almost bet this is your problem.

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G Taylor

01-22-2002 14:35:43




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 Re: JD70 clutch governor in reply to ToddF, 01-22-2002 08:35:34  
Set the preload on the govenor spring 1 hole instead of 1/2 hole. It shouldn't "hunt" as the old spring is getting weak & needs more tension. With the clutch try adjusting it according to the manual after setting crankshaft endplay. If that doesn't work it's time to pull the entire clutch/pulley & clean/inspect plus grease the bearing. The dogs & toggles maybe worn from 46+ years of use. It's real scary/dangerous when they won't disengage at all.

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ryan

01-22-2002 14:03:27




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 Re: JD70 clutch governor in reply to ToddF, 01-22-2002 08:35:34  
Todd,
When I bought my B the govenor didn't have very much response either. What I found the problem to be was there was a lot of crud that had gotten on the governor and wieghts etc. I took it off and cleaned it up. I don't have it running yet so I don't know how much it helped. Good luck,
Ryan



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DON

01-22-2002 14:01:46




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 Re: JD70 clutch governor in reply to ToddF, 01-22-2002 08:35:34  
Todd, You need to adjust the pulley brake. That's the bolt on the brake ,takes a 3/4 wrench and a 9/16 if memeory serves,adjust tighter untill the pulley stops turning after releaseing the clutch lever with no hand pressure on lever.Don't tighten anymore than necessary to do so. Also check the throttle linkage where you put the cotter pin in. Sounds like it is bent wrong and dragging on carb.



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poorerbut

01-22-2002 10:50:07




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 Re: JD70 clutch governor in reply to ToddF, 01-22-2002 08:35:34  
ToddF : I had the same clutch reaction last spring. It's stored in a metal barn and there's
a lot of sweating that probably caused my problem.
I tore everything apart, cleaned and replace the
linings (worn badly) and the problem went away.
Can't explain the governor response on a carb
rebuild unless the linkage to the carb somehow
got changed. The response on mine is instant up
and instant down, no lag. pb

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