GMD 30 Series Rear Mounted Mowers


Triple Your Efficiency

KUHN GMD 30 Series rear mounted mowers deliver a clean cut with a wide cutting width and are ideal for large-acreage producers. When paired with a GMD 25 front mount mower, they feature a total combined working width of up to 32’6”, taking productivity to a whole new level.

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KUHN GMD 30 Series rear mounted mowers deliver a clean cut with a wide cutting width and are ideal for large-acreage producers. These mowers provide high reliability and quick cutting to help produce quality forage at a high output. The high-lift discs and Lift-Control® hydropneumatic suspension ensure excellent cut quality and crop throughput, even in the toughest conditions. Fast-Fit® knives and the Optidisc® Elite lubed-for-life cutterbar take the time and headache out of regular maintenance. Should the mower strike an obstacle while working, the continuous hydraulic safety automatically pivots up and back, minimizing the risk of damage. At the end of the season, store your KUHN GMD mower without any problems thanks to the vertical storage position of the machine.

For the ultimate triple-mower combination, pair one of these models with a KUHN GMD 25 F Series front mount mower, and take productivity to a whole new level. The total combined working width of up to 32’6” knocks down large fields in no time, while exclusive features provide strong returns on investment by reducing maintenance and downtime.

Your benefits

The Optidisc® Elite Cutterbar: A Clean and Consistent Cut


Lubed-For-Life Optidisc® Elite Cutterbar

The Optidisc® Elite cutterbar provides a flat, streamlined profile so that soil and crop residue do not accumulate and material flows smoothly, even in heavy, difficult crop conditions. These mowers come standard with the Fast-Fit® quick release knife system. Optidisc Elite cutterbars are designed and tested with a zero oil change interval. The highly-polished gears and synthetic gear oil ensure that this system does not require any regular internal maintenance, eliminating the need for cutterbar oil changes throughout the life of the machine.

Differential Disc Spacing

The innovative design of the Optidisc Elite cutterbar offers exclusive differential disc spacing.
  1. Less Distance for a Clean Cut: Narrower spacing at diverging discs provides greater knife overlap, which results in a clean cut, even when the grass is short or light.
  2. More Distance for Easy Crop Passage: Wider spacing at converging discs provides more space for the crop to pass. Cut crop is quickly carried away from the cutting area, greatly improving the cut quality.

Standard Fast-Fit® Knives

The Fast-Fit® quick-release knife system allows an operator to rapidly change out cutting knives with the use of a simple tool, yet still retain optimum cut quality and knife life. With Fast-Fit, an operator can achieve up to 50% time savings over a standard system.

Protectadrive® Disc Bearing Stations

  • Protectadrive® Safety: Every minute saved during the hay season is precious. Ultimate protection, from the externally removable Protectadrive disc bearing stations, provides maximum reliability and quick service. In the event of an impact between a disc and an obstacle, the shaft holding the disc can shear just above the bearing. This is thanks to its carefully dimensioned shear groove. As a result, the gear teeth are protected.
  • Extra Rigidity Where it Counts: Disc bearing stations are attached by bolts that pass through the entire cutterbar. This is an exceptionally strong and secure attachment with no risk of mount being torn out of the cutterbar in case of shocks. The disc drive pinion is held precisely in place, all resulting in excellent reliability and reduced maintenance costs.
  • Gear-to-Gear Power Transmission: Gear-to-gear power transmission, a staple of all KUHN disc mowers, allows for maximum power to be transferred through all gears in the cutterbar. Unlike other gear cutterbars, equal sized gears throughout reduces torque on the gear teeth and leads to unsurpassed reliability and longevity.

Exceptional Ground Adaptation and Maneuverability


Lift-Control Hydropneumatic Suspension

Lift-Control is much more than just a suspension system with a nitrogen accumulator replacing the traditional spring. The main advantage of the Lift-Control system is derived from the exclusive way in which kinetic forces that act on the cutterbar are utilized. KUHN engineers have succeeded in making a dynamic suspension system, as opposed to the passive system most commonly used.

With the Lift-Control system, as the force exerted on the cutterbar increases, the suspension system automatically lightens the cutterbar. The greater the force, the lighter the cutterbar.

Benefits include:
  • Constant ground pressure
  • Non-stop safety breakaway
  • Excellent terrain following
  • Less soil in the crop
  • Minimize torn up turf

Wide Overlap

For a clean cut on slopes and bends, the overlap between the front and rear units can be adjusted hydraulically between 12” and 18” (depending on the model combination) – even while driving. This is a real benefit for tractors with wide wheel spacing or large wheels.

Separate Hydraulic Lifting of Units

The possibility of lifting both rear mowing units individually via hydraulic cylinders is a big advantage on wedge-shaped fields and permits quick and easy maneuvers. This can be done directly from the cab. At the same time the system ensures a reduced ground pressure: beneficial to plant regrowth, cutterbar wear and power requirements.

Transport with Ease

Transporting a triple combination, in an upward folded position, leaves it closer to the tractor and allows the machine to have compact dimensions on the road, a center of gravity close to the tractor and a reduced load on the rear tractor axle.

Comfortable In-Cab Adjustments

The KFA 11 terminal facilitates machine adjustments. The following functions can be comfortably controlled from the cab:
  • Folding/Unfolding
  • Independent lifting of the mowing units
  • Ground pressure of rear mowing units

Ultimate Protection


Active Non-Stop Safety Breakaway

No farmer can afford to damage his mower during the peak of the season because of an unnoticed obstacle or maneuvering error. On the new rear units, the mowing unit pivots rearward around the bracing pin when hitting and obstacle. In this moment, oil is transferred toward the suspension cylinder. The resulting pressure increase facilitates the mowing unit raising to clear the obstruction. Return to the initial working position is carried out nonstop.

FlexProtect™: Flexible Protection

FlexProtect™ side shields protect the edges of the machine from damage when driving along field edges or near obstacles. The side shields, made of high-density polythene material, will bend without breaking or damaging the mower. The material then returns back its original shape. When operator’s switch to the transport position, the FlexProtect side shields can quickly be folded up on both sides to reduce transport width.

KUHN Commercial Hay & Forage Equipment

Commercial Hay & Forage Equipment

Because Every Minute Counts

Learn More


Working width
Transport width
Transport height
Overlap with a front mower
Number of discs
Number of flat discs
Blade retention system
Removable Protectadrive® disc bearing stations
Hydraulic lift mechanism
Cutterbar suspension
Cutting height
Suspension travel
Safety breakaway system
Headland turn position
Average swath width
Swathing system
Swath wheel
Primary PTO
PTO speed
Friction slip clutch
Free wheel
Minimum PTO power requirement
Control box
Required tractor hydraulic connections
Road lights and signaling
Machine weight approx.
GMD 8730 GMD 10030
27'2" (8.3 m) - 27'10" (8.5 m) - 28'10" (8.8 m) in combination with a 10'2" (3.1 m ) front mower (depending on overlap chosen) 31'2" (9.5 m) - 32'6" (9.9 m) in combination with a 11'6" (3.5 m) front mower
9'9" (2.9 m) 11' (3.35 m)
11'6" (3.5 m) - 11'10" (3.6 m) - 12'3" (3.8 m) depending on the overlap chosen 13'1" (4.0 m)
1'9" (54 cm) - 1'5" (44 cm) - 11" (54 cm) with front unit of 10'2" (3.1 m) 1' (30 cm) - 1'8" (50 cm) in combination with a 11'6" (3.5 m) front mower
Optidisc® Elite Optidisc® Elite
2 x 7 2 x 8
2 x 5 2 x 6
Fast-Fit® Fast-Fit®
Standard Standard
Standard Standard
Lift-Control® hydropneumatic Lift-Control® hydropneumatic
1.4" - 2.6" (35 - 65 mm) 1.4" - 2.6" (35 - 65 mm)
18.5" (47 cm) 18.5" (47 cm)
Non-stop hydraulic standard Non-stop hydraulic standard
Integrated hydraulics Integrated hydraulics
6'6" (2 m) to 7'9" (2.4 m) per cutterhead 9'2" (2.79 m) per cutterhead
Swath board Swath board
Outside Outside
3-point, Cat. 2 (not quick hitch compatible) 3-point, Cat 3 quick hitch compatible, Cat 4N with optional pins
1 3/4" - 20 spline 1 3/4" - 20-spline
1,000 rpm 1,000 rpm
Standard Standard
Standard, integrated into lateral gearbox Standard, integrated into lateral gearbox
120 hp (90 kW) with front mount included 140 hp (104 kW)
Standard Standard
1 SA and 1 DA 2 DA
Standard Standard
4,190 lbs (1,900 kg) 5,200 lbs (2,360 kg)
Technical Characteristics
Page title
Subtitle page
Picture on left-hand page
Picture on right-hand page
GMD 8730 GMD 10030
GMD 8730 GMD 10030
Pictures28\KSA\KSA Disc Mowers\GMD 8730 Benefit Detail 114H.jpg Pictures28\KNA\1. Hay and Forage\Mowers\GMD_10030\GMD3525F_10030_Action.jpg
Pictures28\KSA\KSA Disc Mowers\GMD 8730 Table Page 114H.jpg Pictures28\KNA\1. Hay and Forage\Mowers\GMD_10030\GMD3525F_10030_Action.jpg



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