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JD 50 not charging

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Kerry Miller

05-26-2002 13:21:45

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My 1950 JD 50LP isn't charging the battery. It has the original generator setup. I checked the voltage across the battery, it doesn't change when I rev it up or let it idle.

I checked the voltage to ground from the F and A terminals but they both showed about a half volt or so. I cleaned the armature and brushes with a little sandpaper and also cleaned the contacts in the regulator.

I haven't checked the voltages at the regulator with the cover off or to see if the solenoids in the regulator are moving, is there anything I need to check in the regulator?

If it's not the regulator, maybe it's the generator itself. I've seen you guys talking about making it "motor" with the belt loose, how do I hook it up to try it?

Is there anything else I might be missing?

Tnx,
Kerry

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Kerry

05-27-2002 04:54:31

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Re: JD 50 not charging in reply to Kerry Miller, 05-26-2002 13:21:45

No, sorry, I fat-fingered it. It's a 1955, not a 1950! I used to have a 1952 A, I guess it would be kinda silly to have a 50 that was older than my A...

Sorry about that!
Kerry

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David Ransom - 1950?

05-26-2002 20:39:57

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Re: JD 50 not charging in reply to Kerry Miller, 05-26-2002 13:21:45

Is it an experimental prototype or something?

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Clooney

05-26-2002 15:58:29

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Re: JD 50 not charging in reply to Kerry Miller, 05-26-2002 13:21:45

Kerry, checking the voltage from [F] or [A] to ground won't tell you anything.
~First.. Make sure you have battery voltage to the [BAT] wire at the regulator, if not find out why & repair that..
~Then with the tractor running at fast idle, jumper the [F] post on the generator to ground, if it charges, you have a bad regulator, poor regulator ground, or open in the wire from the [F] post to the [fld] terminal on the regulator..
~If didn't charge with ground wire on the [F] post, leave the [F] post grounded & running at fast idle then jump the [BAT] terminal on the regulator to the [GEN] terminal on the regulator, if it charges then you have a bad regulator..
~If it still doesn't charge with the [F] post grounded & the [GEN] jumpered to the [BAT] terminal on the regulator you either have a bad generator, or open in the wire from the regulator [GEN] terminal to the [A] post on the generator.
~To test the generator by motoring it just unhook the [F] post wire & run battery voltage to the [A] post on the generator, if it motors [belt off] the armature is probably ok, while it is motoring ground the [F] post & it should slow down, if so the field is probably ok. ~If you do the motoring test that will polarize it for you, if you don't do the motoring test, when done with the tests just momentarily touch a jumper from the [gen] terminal on the regulator to the [BAT] terminal on the regulator with regulator on & hooked up, you should see a spark & it will then be polarized.....

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Everyone should save this response !

05-27-2002 08:54:53

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Re: Re: JD 50 not charging in reply to Clooney, 05-26-2002 15:58:29

Clooney:

I'm going to save this response of yours for future reference. I hope you don't mind if I pass it around. It covers just about everything a fella needs to know in the way of quickly troubleshooting a generator system.

Frank-in-Tallahassee
70D // 855

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Kerry

05-26-2002 18:48:50

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Re: Re: JD 50 not charging in reply to Clooney, 05-26-2002 15:58:29

Thanks, that sounds like the info I needed! I'll try to get out and look at it again tomorrow, at least now I know where to start.

Tnx,
Kerry
PS There was a guy at the Paris, TX tractor pull yesterday with a 50LP, he outpulled nearly everybody except an old Oliver 99. He had wheel weights from a 4020, I believe he said he had 1000 lbs on each wheel.

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