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I had this problem with my 790 2 years ago. JD replaced the battery and repainted where the paint had faded. The replacement battery did not seem any better than the original.

Put an Optima in the 790 and use the JD battery for on my Saturn. Guess you can tell which machine I favor.

The Optima will sit idle for months and start the tractor without hesitation. I do not worry about spilled battery acid.

Check and clean your battery compartment after each use
John Deere Tractors
Replies 29 Post by neilw

Rick

I've had my 790 for almost a year. The machine has done all that I needed. Cutting pasture, surfacing driveways, picking up boulders, drilling holes, clearing tree stumps and moving material.

Only had one problem that the dealer took care of ASAP. The much documented 790 battery problem. So if you buy one get the dealer to provide a strongbox battery up front.

Good Luck.

790 or 990
John Deere Tractors
Replies 36 Post by neilw

Mark

Reading your JD vs synthetic piece. I laughed so hard I nearly peed my pants. Thanks

Big News from John Oh Deere
John Deere Tractors
Replies 4 Post by neilw

Since I posted this question your comments and referrals to other discussions have provided me with the information I needed. I think my best action is a three phase approach.

Phase one is changing the oil and filter early (10 hours in my case)using John Deers 15w-40 oil. This I've done with all my vehicles since I read a book by Robert Sikorsky called " Drive It Forever"

Phase two change the oil and filter at fifty hours as recommended by John Deere. Again using the Deere 15W-40.

Phase Three change the oil and filter at 200 hours. This time using a synthetic such as Amsoil 15W-40 , Delovac 1 or the new Shell Rotella Synthetic.

Thank you all very much.

neilw

Synthetic Engine Hydraulic Oils
John Deere Tractors
Replies 12 Post by neilw