By P.J. Huffstutter CHICAGO (Reuters) – The American Farm Bureau Federation and machinery manufacturer Deere & Co signed a memorandum of understanding on Sunday that ensures farmers have the right to repair their own farm equipment or go to an independent technician. As the agriculture sector accelerates its adoption of technology, the reliance on high-tech machinery such as GPS-guided combines and tractors has become more common-place. But equipment makers such as Deere have generally required customers to use their parts and service divisions for repairs and until recently, only allowed auth…