2026 John Deere Ag 390 

2026 John Deere Ag 390

Flail Mowers and Shredders

Whether you are looking to maintain your pasture, shred stalks or mow along roadsides, parks and school grounds, our long line of heavy-duty cutting equipment is ready to meet your needs.

Compare Frontier Flail Mowers

Frontier Flail Mowers handle tough brush and turf grass equally well. Sharp knives cut and reduce material to a smaller size providing a finished look in various settings.

Features may include:

Heavy-duty gearbox and drive shaft

All John Deere flail mowers feature this rugged, heavy-duty gearbox with a continuous 65-hp rating and an intermittent 90-hp rating. Another feature included is a five-year, unlimited-hour warranty.

Base equipment side-slicer knives or optional smooth-cut knives available

Base equipment side-slicer knives are good all-purpose knives. They provide aggressive cutting action in tough conditions.

The side-slicer knife characteristics are as follows:

• Knives are made of heat-treated alloy steel for durability.
• Individual knife weight, along with the centrifugal force created, provides an aggressive cutting action.
• Edges are ground to provide a sharp cutting surface and reduced horsepower requirements.

Smooth-cut knives can be ordered as an option:

• Smooth-cut knives utilize the same mountings as the side-slicer knives.
• These optional knives are good for grassy, weedy conditions and are self-cleaning.
• Knives can also be resharpened for added wear life.

Heavy-duty hood and end plates

The hood and end plates are designed for heavy-duty applications:

• Hood is made of 0.48-cm (0.188-in.) thick steel to resist denting and wear.
• End plates are made of 0.64-cm (0.250-in.) thick steel to provide structural support and resistance to side thrusts.
• Full-length torque tube helps prevent twisting when operating on uneven ground.

Tractor hookup

All machines have a Category 2/1 3-point hitch. Bushings or reversible pins are included for Category 2/1 compatibility.

The 360, 370, and 390 Mowers with centrally mounted hitches are suited for normal cutting conditions:

• 360 Mower is compatible with quick-coupler Category 1 only.

• 370 and 390 Mowers are compatible with quick-coupler Category 1 and 2.

The 390 Mower with a 30.5-cm or 66-cm (12-in. or 26-in.) hitch offset to the right is ideal for trimming along walls, buildings, trees with low-lying branches, fences, or orchards.