Case 4000 Series Row Unit Upgrades

The Calmer upgrade kit solves many
of the mechanical problems with the
case ih 4000 series corn heads.
These parts will enable your case 4000 to perform
better than new at a fraction of the cost
of a new or chopping corn head.
100% satisfaction guaranteed!

BT Chopper Stalk Rolls

Through the integration of multi-length blades,
Calmer Stalk Rolls have a patented “open window”
feeding chamber, which guarantees the efficient
flow of cornstalks into the row unit to
become processed into “confetti-like” pieces
by 20 razor-sharp blades.

Multi-Zone Beveled Stripper Plates

Our patented stripper plates have a wider
front opening to help prevent the bulldozing
of cornstalks when slightly off the row. The
beveled stripping area emulates the bottom
portion of the corn ear to help reduce
butt shelling problems and trash intake.

Oil Bath "Slow Down" Sprockets

Calmer’s new oil bath sprockets
slow down the entire corn head
to help decrease both ear bounce
and butt shelling problems that occur
when the corn head is running too fast.

Chain Timing Refined

factory 4000 sprockets are too slow.
Calmer Accelerator Sprockets
speed up Gathering Chains by 18%
to allow for more efficeint flow
of cornstalks into the row unit

Calmer Grass Knives

Calmer offers a redesigned grass knife
that helps prevent the back warpping of
grasses around the nose cone.

Case IH 4000
Series Kit

Follow along with Marion as he explains the New Calmer BT Chopper® Upgrade Kit offered for the Case IH 4000 series corn head. These patented corn head parts have been upgraded to fit the newer 4000 models to enable it to perform better than new. Improve your corn head’s performance while also making you more money in the process by reducing a pass across the field, eliminating the chopping of stalks, improving planting operations, and increasing yields.

Compatibile with Case IH Corn Heads:

 4206 | 4208 | 4212 | 4406 | 4408 | 4412 | 4416 | 4418


follow our recommended steps for maximum performance

Step 1



Reliable stalk rolls are critical to a top-performing corn head. That’s why Calmer invented the World’s Only All-Weather Stalk Roll™ known as the BT Chopper®, which is the only roll in the industry with a patented “open window” feeding chamber for the superior feeding and processing of stalks in all crop conditions. 

The 10 razor-sharp knives on each stalk roll cut, chop and shear cornstalks into confetti-like pieces for accelerated decomposition. As a result, you’ll be able to reduce a management pass across the field, improve your planting experience and increase yields. Calmer Grass Knives match the curvature of the  factory nose cone to  prevent the back wrapping of grasses.



multi zone beveled stripper plates from calmer features

“An absolute must for no-till farmers to manage corn residue. Best investment ever for my operation concerning corn harvesting.”

Wayne Waldner

Mitchell, SD


Reduce Butt Shelling and

Decrease “Trash” Into Combine

Calmer’s Patented Multi-Zone Beveled Stripper Plates have a wider front opening that helps minimize the bulldozing of cornstalks when not fully aligned with the row. This wider retrieving area is manufactured flat to reduce ear wedging problems and beveled in the back stripping area to allow the stalk rolls to engage the ear shanks, leaves and husks, which significantly reduces trash intake into the combine. The patented beveled edge emulates the rounded bottom of the corn ear to help reduce butt shelling problems by displacing the energy around the base of the corn ear.


Accelerator gathering chain Sprockets 

drive and idler sprocket for chain timing case 4000

By speeding up gathering chains by 18% with Calmer’s larger 13-Tooth Drive Sprockets, stalk roll speed is better synchronized to gathering chain speed. This allows for more of the plant to be processed at the corn head and prevents the gathering chain lugs from inhibiting the entry of the cornstalks as they travel into the row unit. 

Calmer’s smaller 13-Tooth Idler Sprockets allow for a factory chain to be utilized by maintaining the same chain envelope as factory corn heads. 

“We put the Calmer BT Chopper on our 2208. Half way through Harvest, we purchased a 2212. We were so pleased with the performance of the Choppers that we put the ones off the 2208 onto the 2212, and hurried to pick up the extra 4 rows needed from Calmer. These work extremely well!”

– Eldon Hermunslie
Wahpton, ND


Oil Bath “slow down” sprockets

drive and idler sprocket for chain timing case 4000

Factory Case IH 4000 series corn heads run too fast. This often causes excessive ear bounce and butt shelling. 
To solve this issue, Calmer invented oil bath sprockets to slowdown the entire corn head, decreasing the ear bounce and butt shelling issues caused by excessive head speeds.

(Oil Bath “Slow Down” Sprockets are not available for Case IH 4000 folding corn heads or for 20- and 22-inch corn heads.) 

Big picture Economics

Follow along with George as he explains his thought process behind the economics of maintaining his corn head with Calmer BT Chopper® Stalk Rolls and Residue Management Performance Parts.

Complete the ROI plan to see how



 No Feeding Chamber

Factory stalks rolls fail to engage and process cornstalks due to ineffective designs that restrict the entry of cornstalks. By having the same length flutes, there is no room for stalks to feed into the rolls.  

This flawed design results in the premature wear at the front of the stalk rolls, while the back portion of the rolls remain unused since stalks cannot travel into the row unit.

CASE IH stalk roll design problems

OEM stalk rolls have non-aggressive spirals and a constant overlap in the front. This prevents the efficient entry of cornstalks. 


Patented “Open window” Feeding Chamber

Calmer BT Chopper® Stalk Rolls have a special feeding chamber to allow stalks to easily feed into the corn head in both standing and down corn situations. 

This design feature enables your corn head to perform all crop conditions, guarantees the traction of stalks for processing, provides longer stalk roll life, reduces low ear snap, and prevents the bulldozing of stalks at the end of the rows.

Stair-stepped blades enable Calmer Stalk Rolls to easily engage cornstalks..



 Limited Residue-to-Soil Contact

The stalk rolls on Case 4000 series corn heads not only fail to allow cornstalks to feed into the row unit, but they also fail to process the stalks during harvest for smooth planting in the spring.

Failing to properly process cornstalks into small pieces prevents residue-to-soil contact, leading to the immobilization of important nutrients on the soil surface, slower degradation rates and a wet mattress of residue in the spring.

Cornstalks failed to enter the knife chamber, resulting in little residue-to-soil contact and slow decomposition rates.


10 intermeshing Razor-sharp blades

 Superior Residue-to-Soil-Contact

Calmer stalk rolls are timed to create two feeding chambers twice per revolution to easily engage cornstalks into the 17 1/2-inch knife chamber to become chopped into small pieces. 

In the knife chamber, 20 intermeshing, razor-sharp blades cut, chop, and shear cornstalks into confetti-like pieces. Because Calmer BT Choppers® expose the pith of the stalk and places the residue strategically over the row, you’ll get superior residue-to-soil contact, accelerated decomposition, easier planting and higher yields!

Cornstalks are easily engaged and processed for superior residue-to-soil contact and rapid decomposition..



Factory Case 4000 stripper plates are not formed to match the natural shape of the corn ear which causes kernel loss upon impact by displacing all the energy on one kernel.

As shown in the image below, the additional welded bar along the edge of these plates is problematic because it protrudes above the plate’s edge, causing additional kernel loss.

This design also fails to allow the ear shank to get close enough to the rolls to become processed.  This results in the husk staying attached to the ear and sends it and more material other than grain (MOG) into the combine.

Straight stripper plates don’t emulate the bottom portion of the corn ear, increasing butt shelling and trash intake.


Patented Multi-Zone Beveled Stripper Plates

Calmer’s Patented Multi-Zone Beveled Stripper Plates are flat in the front retrieving area to reduce ear wedging and beveled in the stripping area to allow the stalk rolls to engage more ear shanks, husks, and leaves, and to reduce trash intake into the combine. These beveled stripper plates have a weld hardened surface for extended life.

The patented bevel matches the rounded butt of the corn ear. This does a better job at displacing the energy that contributes to butt shelling by pushing the kernels toward the cob.



Case 4000 stalk roll parts


slow gathering Chain Speed

Synchronizing gathering chain speed to stalk roll speed is essential to processing more of the corn plant at the corn head and preventing the inhibiting of stalks into the row unit to be managed. 

Gathering chains on factory Case IH 4000 corn head utilize gathering chain speed ratios that are too slow to allow for the efficient entry of cornstalks into the row unit.


patented accelerator kit

Calmer’s Patented 13-Tooth “Accelerator” Drive Sprockets increase gathering chain speeds by 18%. This better synchronizes gathering chain speed to stalk roll speed to allow the stalk rolls to make more revolutions to fully process cornstalks at the corn head. This also helps prevent the gathering chain lugs from inhibiting the entry of cornstalks as they enter the corn head. 


fast corn head speed

From the factory, stalk roll tip speed on Case IH 4000 series corn heads is too fast. As a result, these heads lead to increased ear bounce and butt shelling.


Calmer “slow down” oil bath sprockets

Calmer’s “slow down” sprockets for the Case IH 4000 oil bath slows down the entire corn head to help reduce ear bounce and butt shelling problems. This also allows the cornstalk to travel further up the row unit, stripping the stalk at the proper location, instead of doing all the work at the front. 

Get MORE than you bargained for this fall with Calmer's BT Choppers® and Residue Management Upgrade Kits

With Calmer Upgrade Kits, you're getting more than just corn head parts, you're getting peace of mind that your residue management and corn head problems are solved for good during harvest. 


Agronomic and Mechanical Advantages

Mechanical Advantages

    • Compatible with all Tillage Systems
    • 25% Less Hp Needed than with Chopping Heads
    • Superior Cornstalk Flow to Engagement
    • Better Ear Separation
    • Less Tire Wear
    • Less Butt Shelling
    • Increased Harvesting Speeds (Achieved through a combination of installing Calmer® products and proper combine settings)
    • Lower Spread Load

Agronomic Advantages

    • Unmatched Residue Decomposition
    • Warmer Soils
    • Drier Soils
    • Increased Earthworm Populations
    • Reduced Nitrogen Penalty
    • Easier Planting
    • Higher Yields
dave hula reccomends calmer stalk rolls

Still not convinced?

Look at the Benefits on The Ground

the testimonials and scientific studies show how valuable residue is when properly managed. Maximize its worth by managing it with calmer stalk rolls.