John Deere S-Series Combine Tracks 91.4-cm (36-in.) June 20, 2015 by farmlifetoday bigtractorpowerSat, June 20, 2015 5:14pmURL:Embed:John Deere S680 Combine on John Deere 91.4-cm (36-in.) S-Series Combine tracks. Follow us on Facebook for tractor pictures and news at https://www.facebook.com/bigtractorpower