JOHN DEERE INTRODUCES 6E SERIES MULTI-PURPOSE TRACTORS Aug. 26, 2015 Source: John Deere news release John Deere adds the 6E Series Tractors to the 6 Family Tractor lineup, which features enhanced performance, added versatility and greater value to the existing family of high-horsepower utility tractors. The design on the new 6E Series initially began with upgrading the pre-existing 6D line.