Do It Yourself Installation Manuals JD 40/90 Series Installation Manual Learn more about the full Calmer Upgrade Kit for your John Deere 40/90 series corn head. JD 600/700 Series Installation Manual Click to learn about the full Calmer Upgrade Kit available for John Deere 600 & 700 series corn heads. CASE IH 2000 & NH 96C/98C/996 Series Installation Manual Learn about all Calmer Upgrade Parts for CASE IH 2000 and New Holland 96C/98C/996 series corn heads. Case IH 4000 & NH 980CR Series Installation Manual Click to learn about all Calmer Performance Parts offered for the Case IH 4000 and New Holland 980CR series corn heads. Case IH 3000 & NH 98D Series Installation Manual Click for full information on the Calmer Upgrade Kit available for Case IH 3000 and New Holland 98D corn heads. Geringhoff Northstar Installation Manual Find out more about the Geringhoff NorthStar Upgrade Kits. GLEANER HUGGER & MF 3000 INSTALLATION MANUAL Learn about all Calmer Parts offered for AGCO corn heads. Gathering chains & sprockets Installation Manual Installation Instructional Video for John Deer 40/90 Series Corn Heads 00:00 – Intro 00:36 – Tools Needed 02:23 – Removing Hoods, Gathering Chains and Sprockets 09:44 – Removing Grass Knives 11:15 – Removing Stalk Rolls 16:42 – Removing Stuck Stalk Rolls 18:11 – Checking Pinion Shafts and Seals 19:27 – Check Pinion Shaft Timing 18:52 – Installing BT Chopper Stalk Rolls 29:26 – Installing Calmer Grass Knives 32:30: Installing Anti-Hairball Insert 34:17 – Installing Calmer Stripper Plates 35:15 – Setting Stripper Plate Gap 42:07 – Installing Idler Sprockets 46:42 – Installing Drive Sprockets 47:33 – Installing Idler Blocks 48:30 – Installing Gathering Chains Row Unit Replacement Tool List: 1 1/8th or 1/14 wrench 15/16th wrenches 18mm wrench 15/16th socket 18mm socket 3/4 inch socket air hammer 1/2 inch punch impact driver 1/2″ ratchet, 3/8″ ratchet for socets dead blow hammer (soft blow mallet) steel hammer snap wring pliers hex bit (included in mailing) torque wrench 85+ fp putty knife or scraper marker, or paint pen cut resistant gloves FARMERS INVENTED THE BT CHOPPER® SYSTEM IN OUR SHOP, TESTED ITS PERFORMANCE ON THEIR FARMs AND HAVE PROVEN ITS EFFECTIVENESS.