John Deere S680 Combine on Tracks Harvesting Wheat July 5, 2015 by farmlifetoday bigtractorpowerSun, July 5, 2015 2:02pmURL:Embed:John Deere S680 with John Deere 91.4-cm (36-in.) S-Series Combine tracks harvesting winter wheat. Visit www.bigtractorpower.com for more farming videos