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JD 520 why use two 6 volt batterys instead of 12v

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Tony D'Amore

07-08-2003 19:17:50




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My grandfathers jd 520 has two 6 volt batteries under the seat and they need replaced. Why can't i replace them with a 12 v battery, since the 6 volts are hooked in series.
The generator on the tractor is also 12 v




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JD70Jim

07-09-2003 15:40:01




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 Re: JD 520 why use two 6 volt batterys instead of in reply to Tony D'Amore, 07-08-2003 19:17:50  
Look at the CCA rating for two 6v batteries and compare that to one 12v battery. Then price two 6v batteries (I can get them for about $30 each) and compare that to one 12v battery.

The TSC group 1 batteries I used had 650cca and cost $29.95. Together, that's 130cca for $59.90.

I have checked and I cant find 1300cca 12v batteries for that price, assuming I could find them at all.

A lesser 12v battery should work just fine, in warm weather, but if you need the amps in cold weather, you need them, and MORE is better!
The original batteries were 2x6v, or 4x6v ( in 24v applications), because there were no 12v batteries with that kind of performance that would fit in the battery box.

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Tom

07-09-2003 17:15:33




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 Re: Re: JD 520 why use two 6 volt batterys instead in reply to JD70Jim, 07-09-2003 15:40:01  
I think you had better refresh your understanding of ohms law. 2 650cca 6 volt batterys equal 650cca when used in series on a 12 volt system not 1300cca/



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Dan

07-08-2003 21:26:16




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 Re: JD 520 why use two 6 volt batterys instead of in reply to Tony D'Amore, 07-08-2003 19:17:50  
My 70 gas std. uses one 12V, been like that since I got it in '97,everything works and also one 12V is cheaper to replace than 2 6V's and not as often.



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buickanddeere

07-08-2003 20:14:22




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 Re: JD 520 why use two 6 volt batterys instead of in reply to Tony D'Amore, 07-08-2003 19:17:50  
A long time ago in the late 50's. Beefy six volt batteries were cheap and plentiful due to high volume/production. 12V systems were new, high tech, low production volume and expensive for a high capacity 12V battery.It was cheaper to use two six volt batteries instead. And when one six volt battery failed in a 12V system and a new pair were installed. A used working six volt battery became available for use in an older 6V machine. Careful with the polarity. The two cylinders were positive ground from the factory. Many episodes of exploding batteries when boosting when negative ground was assumed. Some tractors had new batteries installed with reversed polarity. The generator would be re-polarized when charging problems occurred. It would run ok but the ammeter would read backwards and the ignition's spark would be weaker with the coil's polarity reversed.

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tony

07-09-2003 05:54:24




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 Re: Re: JD 520 why use two 6 volt batterys instead in reply to buickanddeere, 07-08-2003 20:14:22  
The tractor currently has 2 6volt with 625CCA
If i remember correctly, in series voltage is added together and current stays the same.
So I should get a battery that has around 625 CCA this time also except it should be a 12 v.

The tractor is still set up with the positive ground, so I should just place the new battery in the same way. right?
Thanks



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buickanddeere

07-09-2003 16:48:04




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 Re: Re: Re: JD 520 why use two 6 volt batterys ins in reply to tony, 07-09-2003 05:54:24  
For the putting around occassional use, tractors get the largest Deere Hibernator battery around here. For hot weather and regular usage the largest Deere strongbox battery is installed. Can go wrong with the highest CCA and amp hour, vibration resistant battery that will fit the box. Make certain it's at least on a rubber pad and fastened down. Set the charging voltage at 14.0V full throttle with no lights on. Measured at the battery posts. The 20 amp 12V Delco Generators on the later two cylinders are good working units. Our 50 with the powerblock and a magneto cranks rather smartly with the 1000+ amp Strongbox. Positive ground is fine, just be caeful boosting.

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Clooney

07-08-2003 19:23:17




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 Re: JD 520 why use two 6 volt batterys instead of in reply to Tony D'Amore, 07-08-2003 19:17:50  
Tony, no problem. A single 12 will work fine in that 520. That leaves a little extra room so be sure to fasten the battery down so it doesn't move around. ~I usually put the battery in a plastic boat battery box as that keeps all the acid & corrosion in the plastic box..



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tony

07-08-2003 19:40:27




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 Re: Re: JD 520 why use two 6 volt batterys instead in reply to Clooney , 07-08-2003 19:23:17  
Does it make any difference that it has lights, and the electric starter which were both standard on the tractor.



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Did they orginally come w

07-08-2003 19:33:58




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 Re: Re: JD 520 why use two 6 volt batterys instead in reply to Clooney , 07-08-2003 19:23:17  
Did the 520 orginally come with two 6 volt batteries wire in series???



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tony

07-08-2003 19:42:09




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 Re: Re: Re: JD 520 why use two 6 volt batterys ins in reply to Did they orginally come w, 07-08-2003 19:33:58  
yes, are far as i know.
it was my grandfathers tractor and he has since passed on, so i can't ask him



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Clooney

07-08-2003 19:54:52




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 Re: Re: Re: Re: JD 520 why use two 6 volt batterys in reply to tony, 07-08-2003 19:42:09  
Tony, the 520-530 originally came with (2) 6 volt batteries in series. A good, fairly high CCA 12 volt battery will easily start that 520 as well as run the lights & all the other accessories.
~If you are just playing with the tractor an automobile battery will work fine... If you plan on working it long hours or over rough ground then a tractor rated heavier duty better constructed battery might be a better way to go.....

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tony

07-09-2003 05:56:49




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 Re: Re: Re: Re: Re: JD 520 why use two 6 volt batt in reply to Clooney , 07-08-2003 19:54:52  
the 6 volt batteries currently in the tractor are 625CCA. A 12 v with the same CCA should work properly then? Or do I need higher CCA?
Thanks



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Clooney

07-09-2003 07:18:13




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 Re: Re: Re: Re: Re: Re: JD 520 why use two 6 volt in reply to tony, 07-09-2003 05:56:49  
Tony, it doesn't take much to start a 520, they crank over easily. When your 520 was built the batteries it came with were 2-6 volt batteries of 85 amp hour each. They now rate batteries using CCA so the rating is different.
~I would think a good 12 volt battery of 600+ CCA would start it just fine.



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tony

07-09-2003 14:03:05




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 Re: Re: Re: Re: Re: Re: Re: JD 520 why use two 6 v in reply to Clooney , 07-09-2003 07:18:13  
THANK YOU for your help



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