Unfortunately John Deere does not publish manuals to the public domain. You will need to go to a dealer or purchase one online. One reason I dislike Deere...everything is a big secret.
You can find out if the John Deere 850 will suit your needs by going to the deere website to find its specifications. You can find reviews at www.tractor-review.com/john-deere-850.html.
One can find this and anything John Deere related on the official John Deere website. There one may also find information about John Deere in one's local area.
You can get spark plugs for your tractor at any automotive supply. You might take one of the spark plugs into the store if you are not sure what to purchase. You can also contact John Deere Landscapes in Erie at (814) 455-7850 or visit the website: http://www.johndeerelandscapes.com/ I would recommend you visit the Tractor Supply Store located on Downs Drive in Erie, PA. They have a wide selection of replacement parts and accessories for John Deere tractors.
You can find the newest John Deere tractor models at John Deere's website. The url of this site is http://www.deere.com/
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John Deere has many stores across the US. Call the closest store to find the John Deere Dozer you want! John Deere worldwide: www.deere.com
You can find tires for a John Deere tractor at Lowes, Home Depot, Amazon.com, and ebay.com. There are many stores that currently sell John Deere tractor tires.
One can find reviews on the John Deere 400 on the Product Review Australian website. The John Deere tractor has received mostly positive reviews from the buyers.
Yes, you can find out how much a new John Deere 320 would cost you at www.deere.com. Also, you can check out the price of a used John Deere 320 at www.tractorhouse.com.
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John Deere was buried at Riverside Cemetery in Moline, Illinois, USA.