You can find maintenance repair at any local home and garden repair shop in your area. You can also try going to a local home depot or lowes in your area and see if they perform services.
John Deere's website offers tractor parts. You can find them at their website: http://www.deere.com/en_US/homeowners/parts/index.html
You can use some generic parts on it, but in general it's best to stick with the brand name parts. You can find them for the John Deere 990 at http://www.greenfarmparts.com/John_Deere_Model_990_Tractor_Parts_s/274.htm
Www.johndeere.com is a good place to look. They sell replacement parts for all kinds of John Deere vehicles and equipment. The best place to buy parts for your John Deere tractor is through your local dealer or https://jdparts.deere.com/ which is their website. www.keepingitgreen.com and www.tractorhouse.com also sell John Deere parts.
There are specific store that carry that paticular brand John Deere. You can try searching online for a replacement or in the phonebook to try and find the tire.
You can go to the John Deere website, deere.com. There you will find new wheel axles along with any other parts for your john deere tractor that you will need.
John Deere parts can be found at various tractor stores. The internet is an excellent tool to locate which stores carry these parts.
homedepot or lowes, can have parts for you john deere tractor 970. online is one you can see if they have your brand of equipment and parts you need on.
The best place for specific John Deere parts is a John Deere authorized dealer. You can also consult their company website. Be sure to comparison shop to find the best price.
One can find and obtain parts for a John Deere tractor at online merchants and at John Deere's homepage. One may also find spare parts at one of the largest John Deere tractor part junk yards, McGrew Tractor Parts.
The OEM Parts Store supplies parts for John Deere mowers. If you contact them and describe the part you need replaces, they will tell you where you can find the part number.
To find tractor parts for you John Deere easily is by shopping online. you can search it online and go to the shopping icon at the top. You can also go into a John Deere store. However, my favorite place to shop is on Amazon and EBay.
The best place to start would be at jdparts.deere.com They have compete parts diagrams for everything John Deere.