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John Deere S/Series

John Deere S Series MAD Concaves

A modular frame (green) replaces the original concave, fits into the original concave position in the combine and ALWAYS stays in place. Changing concaves now means you only change out two “concave inserts” (black) per frame.

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Reduced rotor loss
Quick and easy to change concave inserts
Saves time when moving between different crops and conditions
Longer wear and precision sharpness for aggressive threshing

The new split frame MAD concaves with modular inserts, for John Deere was developed to be lighter (30kg) and easier to handle and install into the combine. Once the frame is installed it is never removed, and the modular concaves (15kg) are easy to insert and quick to swap out in mere minutes with two bolts per insert. With this design, you’ll optimize your yield and saves on people power and recalibration time.

Already have MAD Concaves? View our suggested combine settings guides.

Bolt Reference GuideConfiguration Guide

Starter Kit

The Starter Kit: MAD-K-JD-01 is ideal for Barley, Canola, Wheat, Lupins and Soybeans. This concave kit will suit most conditions and most crops. The innovative design on the MAD Concaves inserts have incredible threshing abilities. High quality AR200 metal allows for longer wear and precision sharpness. The numbers .225, .300, .375, .437 represent the measurement of the gap between the bar; the gap being .225 of an inch.

Compatible with: John Deere STS 9650, 9750, 9660, 9760, 9860, 9670, 9770, 9870, S650, S660, S670, S680, S690, S760, S770, S780, S790.

Position 1
Transition Lip Frame
Finger Gates
Position 2
Frame .375
Position 3
One Piece .435

Additional Options

Crop Type

Kit Number

Kit Includes

Hard Thresh Wheat
Hard Thresh Wheat
Broad Bean/Faba/Chickpea
JD. 435 Concave x 2 Position 2
JD Alfafa Grate x 4 Position 1-4
Round Bar
JD Round Bar x 2
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Concaves Design

Finger Grate Concave

• Innovative design
• Minimal Threshing
• Canola, peas, barley, oats, sunflower, corn, soybeans
• Front or Second Position

.225 Concave

• Hard to thresh crops
• Wheat, flax, Frosted Crop

.300 Concave

• Allows more seed out of the concave, reducing rotor loss
• Large easy thresh cereals

.375 Concave

• Large cereal crops that need some threshing
• All crops

.435 Concave

• Ideal for very easy to thresh crops such as hemp
• Chickpeas, faba beans

Slotted Concave

• No threshing, full separation
• No cracking
• Edible beans, canola, sunflower

Lucerne (Alfalfa Concave)

• Both positions
• Specially designed to suit lucerne

Round Bar Concave

• Full separation

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