This is the "Major Drives Repair" section of the John Deere 4400 and 4420 technical manual.
This is the "Separator Shell" section of the John Deere 4400 and 4420 technical manual.
This is the complete 1100 page digital technical manual for the John Deere 4420 and 4400 combines. This manual includes both Repair sections and Operation and Tests sections. You can buy all 25 together for the low price of $99.99 or you can purchase each section individually for $5 - $20.