New Holland 98D Series corn heads

The Calmer upgrade kit solves many
of the mechanical problems with the
New Holland 98D corn heads.
The kit enables your corn head to perform
better than new and 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 reduce the bulldozing
of cornstalks when slightly off the row. The
beveled stripping area emulates the bottom
of the corn ear to help reduce
butt shelling problems and trash intake.

Sprockets and gathering chains


New Holland 98D
Upgrade kits

Follow along with Marion as he explains the Full Calmer BT Chopper® Upgrade Kit offered for the New Holland 98D series corn heads. He describes in detail how the Calmer Upgrade Kit is one of the most advanced corn head systems in the industry that will note only enable your older John Deere corn head to perform better than a new head, but also make you more money by reducing a pass across the field, eliminating the chopping of stalks, improving planting operations, and increasing yields. We guarantee your satisfaction or your money back! 


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 faster residue breakdown. As a result, you’ll be able to reduce a management pass, improve your planting experience and increase yields. Calmer Grass Knives match the curvature of the  BT Chopper’s® redesigned nose to  prevent the back wrapping of grasses.



multi zone beveled stripper plates from calmer features

“I’ve been running Calmer’s Trash Reductions Kits since 2004 and have never had to stop for trash. Never having to stop once in all that time, I feel has increased my productivity 25%-30% due to the combine not having to sort through all that trash. It’s incredible running 6 mph while picking 200 b/u corn!”

Mendell Elson

Miami, MO

calmer stripper plates for new holland corn corn harvesting

Reduce Butt Shelling and Decrease Intake of Material Other Than Grain (MOG) aka “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 designed flat to reduce ear wedging and beveled in the back 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 mimics the rounded bottom of the corn ear to minimize butt shelling problems by displacing the energy around the base of the corn ear.

Are you experiencing other stripper plate problems on your corn head? read more



gathering Chains and Sprockets 

gathering chain speed modifying sprockets
“The multi-zone beveled stripper plates make for smoother feeding, are less row sensitive and great for slopes and curves. Last fall things went smooth with my 600 series BT Chopper Rolls and this spring residue was easy to manage with the planter.”
– Mike Shaw, Ogden, IA

Calmer’s larger 9-Tooth Idler Sprockets improve the corn head’s conveying ability of material and allow for a standard-size gathering chain to be used. This durable non-greaseable idler sprocket is solid-steel and has a replaceable bearing for longer life and lower maintenance. Tough Chrome-Pin Gathering Chains and 7-Tooth Idler Sprockets are shipped with all Calmer Kits.

Big picture Economics

Follow along with George as he explains the costs of ownership of his corn head equipped with Calmer’s Deluxe Upgrade Kit. Just like George, this kit will enable your factory corn head to perform better than new while paying for itself as you run it. Whether you are eliminating a tillage pass, reducing kernel loss, or increasing yields, IT PAYS TO RUN CALMER PRODUCTS!

Complete the ROI plan to see how



 No Feeding Chamber

No stalk roll will perform properly without a feeding chamber in the entry area. All factory New Holland stalk rolls have the same length flutes which causes a continuous overlap in the entry area and prevents the the entry of cornstalks.

Mechanically, this flawed design results in the premature wear at the front of the stalk rolls while the remaining length of flutes remain in good condition since stalks cannot enter the row unit.

CASE IH stalk roll design problems


Patented “Open window” Feeding Chamber

Through in integration of multi-length blades, the Calmer BT Chopper® Stalk Roll is the only stalk roll on the market with a patented “open window” feeding chamber that enables corn stalks to travel efficiently into the row unit to become processed.

This design performs in all crop conditions, guarantees the traction of stalks for processing, results in longer stalk roll life, reduces low ear snap, and prevents the bulldozing of stalks at the end of the rows.



 Limited Residue-to-Soil Contact

Factory New Holland stalk rolls prevent cornstalks from engaging properly with the flutes to become processed. This hesitation results in stalks and ears passing below the corn head without being managed.

Failing to properly process cornstalks 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

During rotation, the shortened flutes on the Calmer BT Chopper are timed to create 2, 4-inch feeding chambers for an efficient handoff of the stalk into the 17 1/2-inch knife chamber to be processed.

Once the stalk is in the knife chamber, 20 intermeshing, razor-sharp blades cut, chop, and shear it into confetti-like pieces. This exposes the pith of the stalk and places the residue strategically over the row for 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 New Holland 98D stripper plates are not formed to match the natural shape of the bottom side of the corn ear, which causes kernel loss upon impact by displacing all the energy on one kernel. (see image below)

This design also fails to allow the ear leaf and the ear shank to get close enough to the stalk roll blades to process them at the corn head. 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 mimic the bottom of the corn ear which causes butt shelling problems and increases trash intake.


Patented Multi-Zone Beveled Stripper Plates

Calmer’s Patented Multi-Zone Beveled Stripper Plates are straight 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, reducing trash intake by an average of 33%. These beveled stripper plates have a weld hardened surface for extended life.
This design also does a better job at displacing the energy that causes kernel loss to save you more money as you harvest!


Calmer Beveled Stripper Plates Minimize Kernal Loss

Calmer Stripper Plates mimic the bottom portion of the corn ear to reduce kernel loss and trash intake. 

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 farmer testimonials and scientific data show how powerful cornstalk residue is when properly utilized. maximize its value by managing cornstalks with calmer stalk rolls.