2026 John Deere Ag S350 

2026 John Deere AG S350

Mower-Conditioners and Mounted Mowers

More Options to Put up Quality Hay

When it comes to cutting hay, John Deere has you covered. Whether you need a side-pull, center-pivot or front- or rear-mounted mower-conditioner, we’ve got the machine for you.

Cover more acres, with greater tractor compatibility and Quick Change Knives. All with the newly redesigned John Deere Zero Series Mower-Conditioners.

Time is critical when it comes to mowing and drying down your hay crop. Now you can get more done and produce high quality hay with the new John Deere Zero Series Mower-Conditioners. Cover more acres per hour with the new C500 Mower-Conditioner. The new lighter weight C400 Mower-Conditioner gives you a wider range of tractor compatibility, and increased ability to customize your windrow. All with the newly redesigned John Deere Zero Series Mower-Conditioners.

More Acres Per Hour

Get more done in a day with the new John Deere C500 Mower Conditioner. The 16 ft. 4 in. (5 m) cutting width of the new C500 lets you cover up to 10% more acres per hour.

Increased Tractor Compatibility

Now you can mow with a wider range of tractors and handle hills easier, due to the lighter weight of the John Deere C400 Mower-Conditioner. In addition to the flexibility to use lower horsepower tractors, you get wider conditioning rolls, Quick Change Knives and continued great maneuverability and durability with swivel hitch options.

Save Time with Quick Change Knives

Cut your time changing knives in half* with the Quick Change Knives, available on the redesigned John Deere Zero Series Mower-Conditioners, letting you spend less time servicing your mower and more time cutting hay. Changing a knife in the field is easier than ever with Quick Change Knives, helping you maintain the best cut quality.

Quicker Dry Down

Getting your hay crop dried down fast is important, especially if you have weather events looming. The John Deere S250, S300, S350, C300, C350 and C400 Mower-Conditioners give you the ability for wider windrows, thanks to the forming vanes. These wider windrows help the crop dry down faster, preserving the quality of the hay and giving you more time to bale before Mother Nature strikes.

Standing Behind our Durability

The 5-year cutterbar warranty shows how John Deere remains committed to the quality and durability of the John Deere Zero Series Mower-Conditioners. The proven drawbar swivel is now available on more models and provides increased maneuverability and driveline protection, letting you make tighter turns with increased peace of mind.

Compare our Pull-Type Mower-Conditioners

John Deere Mower-Conditioners are built with durable parts to withstand the tough conditions of every day use. And with innovations like our cutterbar's patented shear hub, you can be sure that should you hit an obstruction, getting your machine up and running will be fast and painless. 

Cover More Ground with Mount Mower-Conditioners

Get a cutting width of more than 32 feet in one pass, with a narrow transport width of 10 feet. Choose from two front-mount and three rear-mount mower conditioners to meet your needs.

Compare our Front- and Rear-Mount Mower-Conditioners

Get a cutting width of more than 32 feet in one pass, plus a narrow transport width of about 10 feet. Pair it with a 7R or 8R Series Tractor with a front hitch and PTO and AutoTrac for unmatched productivity. From the F310R, to the R990R, there are two front-mount and three rear-mount options to choose from.

Mower-Conditioner

• Reduce service time with Quick Change Knives

• Updated design and styling
• Impeller, urethane or V-10 conditioners
• Gear-driven cutting platform
• Adjustable gauge shoes

Features may include:

Compact size equals a perfect fit with smaller tractors and acreages

The S250 allows for a wide range of tractor compatibility. With lower power take-off (PTO) horsepower requirements and the ability to be pulled from most tractor drawbars, this John Deere mower conditioner gives you the ability to cut and condition your hay for improved dry down.

• Only requires 41 PTO kW (55 PTO hp)
• Simple and easy hookup with the standard clevis hitch
• Improved maneuverability for irregular field shapes when equipped with the optional equal-angle hitch
• Same reliable cutterbar modules that are used on every John Deere mower conditioner
• Transport width of the S250 matches the width of cut for more convenience when moving transporting between fields

Protect your crop with conditioner options to fit your needs

Achieving the right conditioning action can significantly reduce dry down time. That means less time needed to cure, maintaining optimum feed values, and preventing leaf loss in legumes. Hay and forage producers have a wide variety of crops and conditions. That’s why John Deere mower-conditioners offer four different conditioners.  

• Conditioning reduces the time required for dry down
• Multiple conditioner options match a wide variety of crop types
• Faster dry down can increase nutrients retained in harvested crops
• Suitable for traditional dry hay or haylage operations

Conditioner types include:

• Impeller – ideal for light-stemmed grasses and alfalfa that respond well to scuffing of the stems
• Urethane – a soft roll that provides excellent performance in legumes and grasses
• V10 steel – increased crimping for faster dry down and improved wear life
• Tri-Lobe™ conditioner – a premium, patented roll system that uses a chevron design to crimp and crush

Reduced maintenance and proven cutterbar reliability with 5-year coverage

John Deere's patented design cutterbar is made from individual, diagonal-cut modules, making serviceability easy. Each module can be removed for service individually, leaving the remaining cutterbar modules attached to the frame.  

• Nodular iron modules are highly resistant to impact damage
• Large, heavy-duty idler gears reduce driveline speed and wear
• Shear hub protection minimizes cost and decreases repair time in the field
• Gauge shoes provide accurate control of cut height and protect cutterbar
• Low-profile cutterbar allows the operator to cut at a flatter angle for improved cut quality and reduced wear on components
• Common oil bath keeps internal components lubricated and reduce oil-level checkpoints

Because John Deere is confident in the reliability, every mower conditioner includes a 5-year warranty on cutterbar components. This gives you peace of mind knowing that if you do experience a warrantable failure, your machine is backed through your experienced, local John Deere dealer.

Each cutting disk is attached to a shear hub (driver) on the splined pinion gear. Power to the disk is interrupted when the driver shears to protect the internal components of the cutterbar. Damage is limited to exposed components and does not require disassembly of the cutting modules.

• Reduces damage to the cutterbar and driveline components
• Improved uptime with limited disassembly required

The gauge shoe setting determines the height of the crop stubble, but also prevents the majority of the cutterbar from being in constant contact with abrasive soils and rocks. The S250, S300, S350, C300, C350, and C400 have three height adjustments on the gauge shoe. The C450 and C500 come from the factory with six adjustments. Through service attachments, gauge shoe extensions are available to increase the number of adjustments if there is a need for higher stubble height.

Save time with quick-change knives

Having sharp knives on your machine is critical to harvesting all your crop and leaving a clean-cut field. Changing dull or bent knives is no longer a time-consuming job with the John Deere quick-change knife (QCK) system. There are no worries about having an impact or air compressor to change out the bolts. Simply insert the QCK tool into the disk and press down. The knives can be swapped out in seconds.

• Reduce time to change knives by more than 50 percent over the bolted system
• Kits are available to retrofit most 600, 800, and 900 Series Mower-Conditioners

Quickly prepare the mower-conditioner for transport

Overview

An advantage John Deere has over most competitors is that the mower-conditioners transport directly behind the tractor at nearly the same width as its cut. Operators can transition from road to field configuration and back again quickly and easily.

• Quickly move between fields when road transport is required
• Minimize transport dimensions for improved narrow road transport

Side-pull models (S250, S300, and S350) have the tongue positioned in the center of the frame and drivelines that enter from the top to improve transport width.

Minimize dry down time with proper windrow formation

Windrow formation is the final step of mower-conditioner functionality. Proper windrow formation is critical to reducing dry down times for dry hay and haylage or providing consistent chopping speeds and cut lengths for forage harvesting applications.

Characteristics of a quality windrow include:

• Consistent volume of crop throughout the windrow
• No clumping of material that can lead to inconsistent dry down
• Square shoulder and even edges

Sized to the width of the harvesting equipment or spread wide to allow for maximum exposure

John Deere mower-conditioners allow you to customize windrows to match your needs.

• Crop quality is maintained for higher feed value.
• Windrow width can be matched to harvesting equipment.
• Spread crop wide to maximize exposure (up to 337.8 cm [133 in.] with a properly equipped C400), further reducing dry down times.

Adjustable swath boards help direct crop coming through the conditioner assembly, providing a quick adjustment to windrow width.

• No tools required for easy in-field adjustments
• Used to make large adjustments to windrow width

0 Series Mower-Conditioners come standard with forming vanes on the swath board when available. Previously referred to as a wide swath kit, the forming vanes allow the mower-conditioner to increase windrow widths up to 25 percent and can be used to further customize windrow formation to match crop conditions.

• Install all vanes directing crop flow outward to provide the widest windrow and fastest curing
• Use vanes to direct heavy crop flow for more even distribution and consistent drying
• When not in use, forming vanes can be stored on the machine for easy access

The C400 produced the widest windrow when tested against a competitive machine, providing a windrow of conditioned alfalfa that was over 337.8 cm (133 in.). This was over 84 percent of the cut width for the C400 compared to 72 percent for the competition.

Forming shields allow fine-tuning of the windrow width. This can allow you to easily match the windrow to your tractor’s tire spacing and prevent driving on cut and conditioned crop.

• No tools required for easy in-field adjustments
• Allow the operator to fine-tune the windrow width to match equipment and dry-down needs
• Operator can easily set windrow width as required because of changes in crop type, conditions, and operating speed