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Standard Features
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Kubota F3990

Whatever your mowing application, there’s a Kubota F-Series mower that can do the job with power, precision, and efficiency. The line of three revamped models includes the F3990 with the highest-ever horsepower among all Kubota front-mount mowers. And all offer powerful yet more economical and cleaner performance, greater safety, easier maintenance, superior operator comfort as well as a higher level of productivity and reliability making them the right choice to meet all your mowing needs. The new standard in professional front-mount mowers: Kubota’s flagship F3990 features a liquid-cooled, 39 horsepower Kubota diesel engine with an electronic governor that stabilizes engine speed at 2,500 rpm with the PTO switched on for enhanced cutting and discharge performance. Add the optional 100 inch Flex Mower Deck attachment for even more precision-cut coverage.


Model Year
F3990 (4WD)


98.9 in. (2,510 mm)
78.1 in. (1,985 mm)
53.9 in. (1,370 mm)
1,716 lbs. (780 kg)
51.2 in. (1,300 mm)
Ground Clearance
7.3 in. (185 mm)
Mowing Width
72 in. (1,826 mm)
Mowing Height Range
1 - 5 in. (25 - 127 mm) in 1/4 in. (6.4 mm) increments
Fuel Tank Capacity
16.1 gal. (61 l)


Engine Make
Engine Model
V1505T-IDI + DPF
Fuel Type
39 hp maximum
91 ci
Air Cleaner
Dual element


Hydrostatic (HST)
Number of Speeds
2 forward / 2 reverse
Travel Speed
0 - 12.5 mph (0 - 20 km/h) forward
0 - 6.8 mph (0 - 11 km/h) reverse
24x12-12 front
18x9.5-8 rear
Wet discs


Rollover Protection (ROPS)


Hydrostatic power steering / tilt wheel


Deck Construction
Pan: Welded
Thickness: 0.11 in. (2.79 mm)
Depth: 5.5 in. (140 mm)
Side or rear
Deck Lift
Hydraulic, 2-point hitch
Independent live, shaft drive
2,580 rpm

Standard Features

Kubota Diesel Engine
 Powerful Kubota diesel engines mean faster, more efficient job performance. These F-Series engines have power to spare. Their high torque rise ensures faster, smoother recovery under sudden loading, letting you power through tall or wet grass without skipping a beat. They're also environmentally and economically friendly thanks to their compliance with the EPA's Tier IV emissions regulations, enhanced combustion efficiency, low vibration and noise levels, and reduced fuel costs.  
Clean Emission
 The F-Series diesel engines are built for greater power with cleaner emissions. The F3990’s liquid-cooled E-TVCS (vortex combustion system) engine delivers increased power and high torque for all the tractor strength you need while lowering emissions. Its combination with the Diesel Particulate Filter (DPF) Muffler further reduces emissions to make it compliant with the Tier IV Emissions regulations.  
Electronic Governor
 The F3990 diesel engine features an electronic governor that stabilizes the engine speed at 2,500 rpm with the PTO switched on for enhanced cutting and discharge performance, and increases engine speed to 2,700 rpm with the PTO switched off for faster traveling speed.  
High Lift Capacity
 A high lifting capacity gives the F-Series the versatility to handle an array of implements, including a grass catcher, snow blower, rotary sweeper, debris blower and the 100 in. flex mower.  
Large Capacity Fuel Tank
 A large, 16.1 gal. fuel tank not only keeps you working longer between fuel stops, it also reduces the number of fueling stops needed to complete long jobs. That means more time working and less time fueling up. The refueling pipe is now conveniently located right behind the ROPS.  
4WD and Auto-Assist 4WD
 Auto-Assist 4WD works in forward and reverse, automatically controlling the drive loads on the wheels during turns. Auto-Assist 4WD lets you turn with greater efficiency and ease with less wear and tear on the turf. Full-time 4WD can also be engaged.  
Hydrostatic Power Steering
 Hydrostatic power steering reduces operator fatigue and makes it easier to mow around trees and other obstacles.  
Single HST Pedal
 A powerful hydrostatic transmission provides quick response, excellent working speed, and more muscle for tough mowing jobs. The single pedal design lets you easily change the direction as well as control the speed (4WD: 12.5 mph max. forward speed, 6.8 mph in reverse), keeping your hands free for steering and implement control for increased productivity.  
Large Tires with Wide Tread
 Four large-sized tires provide a wide tread for greater stability and maneuverability on slopes, better flotation and less ground compaction.  
Tilt Steering Wheel
 The tilt steering wheel can be quickly adjusted to several positions for optimum operator comfort and further driving ease.  
High / Low Lever
 The handy Hi / Low lever is standard equipped on all models so you can adjust the mower speed to better match the terrain or situation.  
Pro-Commercial Mower Deck
 The Pro-Commercial mower deck comes with an inner baffle to prevent cut grass from discharging to the front. A larger discharge chute improves discharge performance. Also need less power to run mower.  
PTO Shaft Drive
 Shaft drive means no belts or pulleys – just smooth and direct power transfer from the engine to the deck and other PTO-driven attachments. Shaft drive also requires less maintenance and provides greater dependability.  
Multi-V-Belt and Steel Pulleys
 In addition to providing greater wear resistance, the heavy-duty cast-iron pulleys and a multi-V-belt drive system effectively distribute and reduce tension while transmitting power to the mower blades. The multi-V-belt won’t twist or slip, thus reducing the chance of damage to the mower. You get more performance and power – and fewer problems.  
Fabricated Deck with Sturdy Steel Construction
 Stronger and more durable than conventional pressed steel decks, the F-Series’ fabricated steel decks are designed to provide years of reliable cutting performance with minimal maintenance.  
Swivel Anti-Scalp Wheels
 The mower deck is equipped up front with two large wheels that swivel independently through 360°. The wheels ensure that the deck remains above the turf, preventing unsightly turf damage.  
6.0 in. Deep Mower Deck
 Tall grass is no problem for this side-discharge professional mower deck. Its 6.0 in. deep deck design lets tall grass stand up so that it can be cut more efficiently. This results in a faster cut and a cleaner appearance.  
Rear Discharge Mower
 When side discharge won’t do, mount a rear discharge mower deck. Two sizes 60 and 72 in. are available. Both decks tilt up 90° for easier cleaning and blade sharpening. They also feature sturdy steel construction for greater durability and front lift arms that attach directly over the center of gravity for better control. Mulching kits are also available.  
Easy Maintenance
 Downtime is unproductive time, so the F-Series is designed for quick and simple maintenance. From the quick-release engine cover to the 90° tilt mower deck, every detail has been geared towards getting you back on the job as quickly as possible and keeping you there as long as possible.  
90° Tilt Mower Deck
 The mower deck lifts a full 90°, providing unobstructed access to the blades and deck underside for easier cleaning and maintenance.  
Dual-Element Air Cleaner
 The dual-element air cleaner helps keep the engine running smoothly and efficiently. Only the outer filter needs to be replaced—the inner filter can be cleaned with a pressured air—helping to reduce maintenance costs. The F3990 air cleaner is equipped with a choke indicator that turns red when the filter needs cleaning or replacement.  
Integrated Radiator Screen
 The new, easy to clean radiator screen is integrated into the engine cover to help keep the engine running cool and efficiently. A water temperature gauge and overheating alarm are also provided to help prevent overheating.  
Tool Box
 Conveniently located under the seat, the tool box provides fast access storage for your tools. It’s also an ideal place to store your operator manual for quick and easy reference while on the job.  
New Digital Panel
 The new easier to read LCD digital panel provides vital information about the F-Series mower at a glance, including DPF-related information, engine speed, remaining fuel, water temperature and hour meter.  
Deluxe Seat
 The F-Series’ high level of comfort starts with a deluxe high-back seat with four separate adjustments: weight control, lumbar support, back angle, and arm rests to provide every operator with a custom fit and optimum comfort.  
Operator Levers
 For easier operation and greater convenience, the High / Low speed lever and deck-lifting lever are positioned beside the operator’s seat. The lever guides have also been designed for quick, at-a glance identification.  

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