John Deere 9420R 4wd Tractor on Grain Cart Duty August 22, 2016 by farmlifetoday bigtractorpowerMon, August 22, 2016 4:04pmURL:Embed:John Deere 9420R 4wd with a Kinze 1100 grain cart unloading on the go with a John Deere S690 combine. http://www.bigtractorpower.com