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  1. #1
    Silver Member
    Join Date
    Aug 2000
    Posts
    209
    Location
    Louisa, Virginia
    Tractor
    John Deere 790

    Default Batteries

    Went out to move the JD790 from the garage so that I could put the pickup in to load it to take No. 1 daughter back to college tomorrow, all it does is click - no battery. Just parked it in there Monday morning after No. 2 daughter left for college, it had been parked outside since Friday evening when I began the timing belt/water replacement (100 K maintenance) project on the Dodge Caravan (don't wish that on anyone). Back to the tractor, checked the battery, positive cable end gone again, replace under warrenty last March (using the red and green felt washers to help prevent a re-occurance), connector is a cheap design, formed sheet metal with bolt. I have kept the battery clean using baking soda, last cleaning in mid-October when I was doing winter maintenance on the vehicles. Found large build-up of fuzzy crude under the positive cable cover, and a little on the negative side and some fuzzy crud on the hold down strap but it does not appear any corroson anywhere else tonight. Will check with dealer first of week, assume another warrenty replacement. Have others experienced this problem, and what was your fix? Any suggestions? I checked the radiator and dust screen, no apparent damage there, but will clean the entire area with baking soda when putting it back together. For those not knowing, battery is in the front of the tractor, with the post to the rear where the fan would pull any battery ventings over the connectors to some extent. Thanks for any input.

  2. #2
    Veteran Member
    Join Date
    Nov 2000
    Posts
    1,720
    Location
    Columbia county NY
    Tractor
    87 Ingersoll 444, 84 Ingersoll224/'44 GreavlyL/60'sGreavlyL/49 Ford 8N

    Default Re: Batteries

    They make a spray that you spray on the terms after you clean them. You can get it at any auto parts store. That may help. Also there is a chance the battery is bad. Could have a small crack somewere. One last thing. Can you rig up some kind of sheild, or cover over the battery? I have never worked on one, so I don't know how much room you have. Good luck.

  3. #3
    Super Star Member Egon's Avatar
    Join Date
    Aug 2001
    Posts
    17,699
    Location
    Nova Scotia, Canada

    Default Re: Batteries

    Thoughts:

    Perhaps one could spray it with a Paint specifically for electrical conections. It's a spray can. Can't remember the name. Maybe also look at replacing the connector and use a larger cable.
    Is there vibration where the battery sits and is it a battery for rough service?

    Egon

  4. #4

    Join Date
    Oct 2000
    Posts
    281
    Location
    Fredericksburg, TX
    Tractor
    John Deere Model 670

    Default Re: Batteries

    I'm not sure if this is relevant because I live further south, but here goes. I had the same thing happen with my JD670 a few months ago. When I pulled the battery out and took a good look at it, IT WAS LOW ON WATER. This really surprised me, because I only had about 175 hours on the tractor. When we lived up north (South Dakota, Minnesota, Wisconsin) we rarely had to add water to the cells. In fact, I could go for years without doing anything to the battery. I checked with the JD service people here in Central Texas and was told that this is a common problem in a warm climate such as ours. Batteries need to be checked fairly often. When I looked at the batteries in our car and pickup, sure enough, they were a bit low too. By the way, I also had some corrosion, but I cleaned everything off with baking soda and water and then smeared on a bit of lithium grease and that took care of that problem.

  5. #5
    Platinum Member
    Join Date
    May 2001
    Posts
    670
    Location
    Ontario, NY
    Tractor
    JD 790 (2001)

    Default Re: Batteries

    <font color=blue>Have others experienced this problem, and what was your fix? </font color=blue>

    My next door neighbor has a 790 and he told me (last spring) that this is a very common problem with the 790. He had the dealer come to his house to fix it and it happened again.

    I have a 790 too with only 80 hrs. I'm gonna go down to the barn and check it out now. Thanks for reminding me.

    Buck

  6. #6
    Silver Member
    Join Date
    Feb 2001
    Posts
    125
    Location
    Woodbury, Connecticut
    Tractor
    New Holland TC35D

    Default Re: Batteries

    I've got a 790 and haven't had any terminal corrosion problems yet, but I have a question for the 790 owners. The 2 stage clutch seems to have a VERY narrow band, near the top, where the transmission shifts smoothly. If I fully depress the clutch, it shifts hard. Sound familiar?

  7. #7

    Join Date
    Oct 2001
    Posts
    122
    Location
    Salem New Hampshire
    Tractor
    Kubota B1700 TLB

    Default Re: Batteries

    I have always covered my battery terminals with white lithium grease using a small acid brush(paint brush) after the connection is clean and tight.I think I read somewhere in the manual to do this,which surprised me that they would mention it .

  8. #8
    Silver Member
    Join Date
    Sep 2001
    Posts
    123
    Location
    Kentucky (in the bluegrass!)
    Tractor
    Kioti LK3054, IH cub cadet 782, Grasshopper 721D2

    Default Re: Batteries

    I annually clean all connections and then put a liberal coating of vaseline on them (same principle as the lithium grease) it has worked well for me [img]/w3tcompact/icons/grin.gif[/img]

  9. #9
    Silver Member
    Join Date
    Apr 2000
    Posts
    103
    Location
    Georgia
    Tractor
    2000 JD 790

    Default Re: Batteries

    HalseyGreen: I had the same battery problem. I saw on CTB that JD is covering under warranty. I believe the problem is with the battery or charging system. Dealer checked it out and replaced the battery. Dealer also checked for damage to oil cooler (from battery acid) they will also replace the oil cooler if necessary, all under warranty. They knew about the problem and repair process, but did not contact me. I first heard it on CTB. John.

  10. #10
    Silver Member
    Join Date
    Aug 2000
    Posts
    209
    Location
    Louisa, Virginia
    Tractor
    John Deere 790

    Default Re: Batteries

    I pulled the battery out on Sunday, it was a little low on water, cleaned everything up with baking soda, including radiator (no sign of corrosion), used an universal battery connector for the time being, Dealer says he will get me another cable and agreed its a cheap design. Used the red and green battery post protectors as well as coating the post with lithium grease. Thanks for the support. I guess this will become a quarterly maintenance item verses an annual one.

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