2026 John Deere Ag FM4012 

2026 John Deere Ag FM4012

Grooming Mowers

Economy, standard-duty, medium-duty or flex-wing mowers that fit your job and budget. Reinforced steel decks stand up to rugged terrain, and gearboxes are engineered for long life and quiet operation.

Compare Frontier Grooming Mowers

Frontier Grooming Mowers deliver a smooth cut for lawns, sports fields, and golf courses.

• 4 to 9 ft. (121.9 to about 279.4 cm) cutting widths
• Single- or dual-belt drive
• High blade speed for thorough cutting and uniform distribution
• Category 1 iMatch™ compatible with optional kit
• Rear discharge

Compare Frontier Flex-Wing Grooming Mowers

Go with the Flex-Wing Grooming Mowers for a quality cut over uneven fields. They feature wide working widths to make quick work at sod farms, golf courses, and parks.

• 12 to 17 ft. (3.7 – 5.2 m) cutting widths
• Rear Chain Shield
• Transport light bar (optional on FM40)
• Hydraulic wing latch release (optional)

Features may include:

Caster wheels follow ground contours and provide a uniform cut

By having four caster wheels per deck, the FM4012 Mower follows ground contours with ease. Tubular caster wheel arms are bolted to rail supports for added durability.

Anti-scalping rollers option for uneven terrain [Field Installed]

In option, each deck on the FM4012 can received up to three anti-scalping rollers specific for highly uneven terrain.

Deck baffling ensures exceptional cut quality and material distribution

The FM4012 deck depth with baffling around the blades ensures exceptional material distribution and a higher quality of cut.

Gearbox comes with 6-year warranty

Each of the FM4012 gearboxes include a 6-year warranty.

Hydraulic wing decks and rear deck automatically locks for transport

The FM4012 has hydraulic lifts for the wing and rear decks to automatically lock them in the up position for transport. The lift and lower for the wings and deck are operated together through the same hydraulic supply with single acting cylinder, requiring only 1 tractor rear SCV.

To unfold the wings and rear deck from transport position to working position, the FM4012 has a standard rope-pull latch release. An optional hydraulic-wings latch release kit allows the operator to release the decks from transport lock position using a 2nd rear SCV.

Cast-iron blade spindles provide long life and strength

For longer belt life, FM4012 comes with cast iron blade sheaves, and also includes ductile iron spindles that have a 1-year warranty and are lubed for life.

Transport width of 2.31 m (7.58 ft) enables storage in a standard-sized garage

The FM4012 has a transport width of 2.31 m (7.58 ft), height of 1.82m (5.96 ft) and length of 3.43m (11.25 ft) to fit in standard size garage.

High blade-tip speed

High blade-tip speed and precise blade overlap work together to ensure exceptional, performance, and cut quality. With a speed of 91.44 m/s (18,000 fpm) blade tip speeds, the cut quality stays intact at mowing speeds up to 8 km/h (5 mph).

Easy maintenance

The shields, protecting the drive belt, are easy to remove without the need of a tool. This ensures easy access to the sheaves, belt, and spring-loaded idler.

Rear chain shield [Field Installed]

Hydraulic wing latch release kit [Field Installed]

This optional hydraulic wing latch release kit is available for the FM4012.