790 Battery: Tractor Engine Repair Rebuild  -- Tractor Maintenance Discussion Forum and Review 790 Battery: Tractor Engine Repair Rebuild -- Tractor Maintenance Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

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 03-20-2001, 18:02 Post: 25681
Rob Munach



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 790 Battery

I just picked up a new battery and positive cable from my JD dealer as a warranty replacement for the constantly corroding stock battery. The new battery appears to be an average size automotive battery (about 1 1/2 times as big as the original) Interestingly, it says "John Deere Motorsports" on the label.






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 03-21-2001, 17:38 Post: 25701
Glenn Fitzgerald



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I've seen this battery concern expressed many times on the board since I purchased my machine last October. I read your message this morning and thought I should ask my dealor about the 790 battery. The dealor didn't know(or pretended not to know)anything about the problem. Is John Deere not recalling the batteries/cables on the 790 machines but just replacing upon experiencing the problem? Is it a problem with tractors manufactured at a certain plant or during a certain time period? I have a real problem with the battery leaking and the acid being drawn in through the radiator by the fan(poor placement by Engineering)!! I can only imagine what they would want($$) for a radiator! Did they answer any of these questions at your dealor? Does anyone else have information that can help us out? thanks...






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 03-23-2001, 21:45 Post: 25794
Jim Warrell



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 790 Battery

Glen, I have a 2000 JD 4300 with the same battery problem. The dealer offered me a new, the same weeping oozing style battery that the tractor came with. He admitted that there had been other complaints besides myself. He also said that the smart thing to do would be to get rid of the battery. I bought a Delco Freedom battery, 700 cca,this battery is similar in length and height but deeper. I made a frame and bolted it in place. Made a hold down bracket for the top. Cleaned the + cable and a little JD black paint. You need to leave clearance between the radiator and battery for air flow. The battery looks good and works great! No more corrision! By the way it was a mod.# 35 6yr battery. Jim in Middleton, Idaho






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 03-23-2001, 21:46 Post: 25795
Jim Warrell



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 790 Battery

Glen, I have a 2000 JD 4300 with the same battery problem. The dealer offered me a new, the same weeping oozing style battery that the tractor came with. He admitted that there had been other complaints besides myself. He also said that the smart thing to do would be to get rid of the battery. I bought a Delco Freedom battery, 700 cca,this battery is similar in length and height but deeper. I made a frame and bolted it in place. Made a hold down bracket for the top. Cleaned the + cable and a little JD black paint. You need to leave clearance between the radiator and battery for air flow. The battery looks good and works great! No more corrision! By the way it was a mod.# 35 6yr battery. Jim in Middleton, Idaho






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 03-24-2001, 13:46 Post: 25810
Glenn Fitzgerald



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 790 Battery

Jim,

Thanks for all your information. I'm wondering if the charging system isn't regulated very well or if it's just a defective battery. I sent an email to the factory this morning regarding the problem, I'll let you know what JD has to say.








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 03-27-2001, 20:14 Post: 25979
Jim Warrell



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 790 Battery

Glen, The charging system is fine. I have owned numerous batteries of this same venting design. Exide, Sears Die-Hard, also a couple of RV batteries with different filler caps. They all do the same thing. Last night I hauled a friends tractor, a 2000 JD 790 with only 45 hours on the clock. He had just bought it from a private party. I looked thru the grill and noticed a large gob of corrosion on the positive cable and the hold down bracket! Told him to get it cleaned up asap and get a Delco Freedom battery. Also I have e-mailed John Deere and am waiting for a reply. Jim






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 04-07-2001, 15:47 Post: 26430
D. McIntire



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 790 Battery

I tried to send a comment last week but couldn't figure out how to reply, lets see if I can send this. I have a Cub Cadet 7234, (23HP 4WD, w/FEL), incase you aren't familiar with it and I had the same battery problem. I think I had had it about a year and I opened the hood one day to check something and the old corrosion was really growing. I always keep it garaged I was really amazed about why I had it. I just took the battery out and cleaned it up, painted the area and it has been pretty good since although I see I have a little there again. I think it must be a common problem to the compacts although I'm not sure why. I don't know that this will help any but I wanted you to know you weren't alone with a battery problem.






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 04-08-2001, 06:49 Post: 26451
Rob Munach



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 790 Battery

I thought I had my 790 battery problem licked when the dealer gave me a new, and what appeared to be, a high quality automobile battery. This weekend,after about 1 hour of use after the battery install, I noticed that the paint on the front of the tractor near the suitcase weight hanger was blue. I opened up the hood and found the entire battery copartment covered with acid. The top of the battery was also a pool of acid. I quickly washed it down with baking soda, but I am left with a bunch of sheetmetal that needs to be replaced. I guess it could be sanded and re-painted, but new is better. Anyhow, before I turned off the tractor, I checked the voltage at 2600 rpm. It was 14.4V which I believe is reasonable. I am going to the auto parts store on Monday to buy a completely sealed champion battery. It is $130 but apparently it can be used upside down. Hopefully, I can get my dealer to replace the sheet metal and pay for the new battery, but I would really like to know what it is about my tractor that is causing the batteries to leak so badly.






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 04-08-2001, 07:25 Post: 26456
TomG

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 790 Battery

Some of the maintenance free and sealed batteries are light on cranking and cold-cranking ratings compared to similar physical sized conventional batteries. I'd check to ensure that both amp hour and cranking arm ratings are similar to factory specs. This battery issue is sort of a mystery to me. I don't doubt that the problems exist, but they seem unusual. At least the way I think about it is that a conventional battery doesn't seep acid unless it's at an extreme angle irrespective of the cap or other vents. Also a battery vent doesn't emit appreciable acid fumes unless it's charged at a rate where it becomes hot. And, positive terminals don't corrode much if terminal grease is used. I really don't understand this one, but of course, I've been wrong or unknowledgeable many times. I also don't know if a 35 amp alternator (or whatever the alternator capacity is) is capable of boiling an (850 CCA battery or what ever it is) even if the regulator were stuck. On the other hand, a regulator test might be good for a tractor that makes puddles of battery acid.






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 04-08-2001, 14:58 Post: 26470
Rob Munach



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 790 Battery

A further investigation into my battery acid problem reveals that the new JD battery that I recieved simply leaks like a sieve. I had the battery sitting at about a 10 deg. angle on my driveway and watched as acid ran right out of the cell covers - and they were tight! Geez, no wonder I has acid all over my battery compartment!






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

Thread 25681 Filter by Poster:
D. McIntire 1 | Glenn Fitzgerald 2 | Jim Warrell 3 | John Miller, III 1 | Ken Butner 1 | Rob Munach 4 | TomG 2 |

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