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JD 70 Gas

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Seamo

06-30-2002 09:11:56




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This time I need help or suggestion on where to look.JD.70gas friend of mine bought this tractor and the charging system doesnt work right . The tractor when at fast idle will put out 10-15 amp on meter, speed tractor to wide open only put out 5amp. bring back to idle 10-15amp. Ground field gen output good .Checked batt both are new and check ok. Checked ground on reg Owner thought needed new reg put on reg polarized before starting same problem. Do any of you experts have a idea where to start. I respect all your ideas and knowledge to fix this thing. Earl

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Seamo

07-03-2002 17:41:50




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 Re: JD 70 Gas in reply to Seamo, 06-30-2002 09:11:56  
Hello John Deere friends, I just wanted to let you know I got the problem 70 Deere charging system fixed. I am old enough to know that when you get called in to HELP A FRIEND fix a problem that you need to start from square one. I didn't but it was fun anyway.The wire from batt to ammeter had been spliced (bad connection) Wires on ammeter were on wrong side.(switched)Friend had replaced reg from Deere. I don't know if it had been hooked up wrong or what.New reg would not work. Put on old reg, wired right,fixed wire,turned armature,was a rebuilt Gen. sometime was not undercut right, couple of segment ground,new brushes.Bingo works good. Special Thanks to ClOONEY, and DEERE PULLER for your help and your post back to JD70 GAS. Earl Seamands in Mahomet Illinois

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Clooney

06-30-2002 10:44:42




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 Re: JD 70 Gas in reply to Seamo, 06-30-2002 09:11:56  
Seamo, how fast are you trying to run it?
~Fast idle is 1115 RPM on a 70 gas, & WOT shouldn't make it any higher. It should pull down to 975 while under load.
~Are you grounding the field while checking the amp out put?, if not the regulator could be going into current control & backing off on the amps to lower the voltage going to the battery.[the regulator on the 70 controls both].
~With a grounded field, the amp out put should follow the engine RPM [if it does & the problem only shows up with an un-grounded field your generator is good & the problem is either current control or regulator related]
~Other than current control you could have a slipping belt [common if the belt is narrower than the pulleys].
~Leave the lights on for a while before starting the engine & see if a depleted battery calls for more current to the battery, if so you are probably normal, if it still does the same thing, check the belt, or for a bad generator or regulator ground, & for a dirty or pitted commutator..... ..... ..... ...

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Deere Puller

06-30-2002 09:44:54




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 Re: JD 70 Gas in reply to Seamo, 06-30-2002 09:11:56  
I had a "G" that once did the same sort of thing. New set of brushes, brush retainer springs and brush alignment solved the problem. At higher speeds, apparently the contact w/ commutator wasn't sufficient. I am not a charging expert by any means, this just happened to fix the problem.



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