Installation Instructional Video Deere 40/90 Corn Heads

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

40-90 Series Oil Bath Setup and Maintenance Tips:

For 40 Series and Older 90 Series Corn Heads Only: Using a 64-tooth sprocket (JD Part # AH145940) on the cross auger instead of the factory 54-tooth will slow the auger down and help reduce ear toss. This 64-tooth sprocket uses a #50 roller chain. The new 90 series corn head cross augers come from the factory already slowed down with a 52-tooth sprocket that uses a #60 roller chain.

Oil Bath Settings

The corn head should have the oil bath in overdrive, the large sprocket on the back (driver), and the small sprocket on the front (driven).

40/90 Corn Head Gear Ratios

• 693: 30 Driver; 25 Driven
• 893: 30 Driver; 25 Driven
• 1293: 22 Driver; 18 Driven
• 1290: 22 Driver; 18 Driven

Feeder House Settings for JD Combines

Standing Corn: 600-610 RPM on variable speed. As previously mentioned, we suggest staying
on fast setting (large sprocket) for the feeder chain speed when harvesting.

Further instructions:

• Must have heavy duty reverser (8 rows or above have a finned aluminum cooler (recommended
by John Deere).
• Only use fully synthetic oil in the reverser.
• There are 2 grease fittings on the reverser. These need to be placed at the 12 o’clock and 2
o’clock positions. Put 12 pumps of grease in the fitting located at 12 o’clock and 2 pumps of
grease in the fitting located at 2 o’clock. Do Not Over Grease!
• Once you start-up the machine, at idle, run the variable speed up and down twice to lubricate
properly prior to harvest.
Down Corn: 500-550 RPM on variable speed.
JD Corn Head on Case Combine or
non-variable speed Feeder House
Combine
• JD 693: 34 Driver; 22 Driven
• JD 893: 34 Driver; 22 Driven

Learn more about the full Calmer Upgrade Kit for your John Deere 40/90 series corn head.