KUHN GMD 51 TL Series Trailed Disc Mowers

Trailed Simplicity and Versatility

With working widths ranging from 8’10” to 13’, KUHN GMD 51 TL Series mowers get you in and out of the field faster.

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As the first to market and industry leader, KUHN knows disc mowers. The GMD 51 TL Series trailed disc mowers have many of the same great features you have come to know and love. These trailed mowers offer high working rates, simple adjustments and low maintenance for dependable grass and forage harvesting. They provide easy tractor attachments, as well as improved contour following, compared to the fully mounted models. The trailed design also lowers the tractors ballast requirement, allowing use with smaller tractors while maintaining excellent stability in both work and transport.

The Optidisc^® Elite Cutterbar: A Clean 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. 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.

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.
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.

Discs & Open Cones

The new style discs incorporate flat angled leading edges to lift the crop off of the cutterbar and promote fast movement of the crop through the machine to be laid in an even swath. On the underside of the disc, there are welded-on scrapers. These scrapers keep the cutterbar clean of mud, dirt and debris when mowing in wet or dusty conditions.

Similar to the discs, the open cones have large area leading edges to evacuate the crop being cut and push the crop towards the center of the machine leaving a desirable edge to the swath. The open cone design also makes them easier to clean for less machine vibration and easier access to bolts on the disc whenever maintenance needs to be performed.

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 Terrain Following

Pro-Active Lift^®

This maintenance-free system allows the machine to quickly adapt to abrupt changes in terrain or when an obstruction is encountered in the field. The cutting head is able to move up and back simultaneously, dissipating the force of any impact and providing space to clear the obstacle. This unique design reduces scalping to preserve crop stubble and helps protect the machine from potential damage. A slotted linkage on each side provide guidance for the header and eliminates the need to run the hydraulics in the float position.

Constant Float Suspension

The header is suspended on each side by a long, large-diameter spring that provides a constant range of flotation. The floating head lifts up and back, and can oscillate from side-to-side, to closely follow the ground contours and conform to irregular terrain. This reduces the amount of missed crop in the field and helps keep dirt out of the harvested crop.

Superior Maneuverability

The heavy-duty Gyrodine^® gearbox is designed to withstand the most severe pull-through force from the hitch to the machine. The swivel design allows in excess of a 90° turn while keeping the PTO driveline straight. This design also allows extremely tight turns for clean, square corners while minimizing PTO vibration and wear.

Simple Design and Easy Service

Direct Drive Design

The direct design provides easy access for servicing and fully eliminates belts. Reliability is greatly improved when working in longer, tough or lodged crops. Unlike competitive models that require daily greasing, the driveshaft to the cutterbar uses maintenance-free U-joints. These joints reduce overall maintenance and eliminate excessive wear from improper maintenance.

Convenient Height Adjustment

The height change adjustments are fast and simple, and do not require tools. Cutting height is set using a special turnbuckle that adjusts easily with only modest effort. A convenient gauge on the turnbuckle shows the cutting height for precise field adjustments.

Steel Side Sheets

The steel side sheets provide a definitive line between cut and uncut crop. This makes the subsequent pass easier to follow for the operator and also gives the machine a finished look.

Toolless Hood Latch

Operators can easily open the front hood of the mower, with the pull of a lever, for clear access to the cutterbar for inspection or maintenance.

Equipment

1000 RPM Drive

An optional 1000 RPM PTO offers flexibility for the customer to run the mower with a larger tractor and provides dependable operation in varied conditions.

CV Secondary PTO Shaft

For flexibility to steer around obstacles in the field with the mowers’ hydraulic swing cylinder or to mow directly behind the tractor without PTO chatter, a secondary PTO shaft equipped with a constant velocity joint can be factory ordered or field installed.

Plastic Rock Guards

A HDPE (high-density polyethylene) rock guard can be mounted on the underside of the front hood for added protection in rocky conditions.

High-Lift Skids Shoes

For customers requiring a higher cut height for certain crops or when cutting in rocky conditions. The skids are adjustable for cutting between 2.1” – 6”.

Specifications

SPECIFICATIONS


Working width
Transport width
Number of discs
Disc type
Blade retention system
Removable Protectadrive® disc bearing stations
Hydraulic lift mechanism
Cutterbar suspension
Safety guards
Cutting height
Suspension travel
Average swath width
Hitch
Tires
Primary PTO
Secondary PTO shaft
PTO speed
Friction slip clutch
Minimum PTO power requirement
Required tractor hydraulic connections
Side sheets
Road lights and signaling
Machine weight approx.

GMD 2851 TL	GMD 3151 TL	GMD 3551 TL	GMD 4051 TL
8'10" (2.8 m)	10'2" (3.1 m)	11'6" (3.5 m)	13' (4.0 m)
9'4" (2.9 m)	10'4" (3.2 m)	11'8" (3.6 m)	13'1" (4.0 m)
6	7	8	9
Optidisc® Elite	Optidisc® Elite	Optidisc® Elite	Optidisc® Elite
Fast-Fit	Fast-Fit	Fast-Fit	Fast-Fit
Standard	Standard	Standard	Standard
Standard	Standard	Standard	Standard
Constant Float® suspension with Pro-Active Lift®	Constant Float® suspension with Pro-Active Lift®	Constant Float® suspension with Pro-Active Lift®	Constant Float® suspension with Pro-Active Lift®
Standard	Standard	Standard	Standard
1.4" - 2.6" (35 - 65 mm)	1.4" - 2.6" (35 - 65 mm)	1.4" - 2.6" (35 - 65 mm)	1.4" - 2.6" (35 - 65 mm)
+10" to -4" (+25.4 cm to -10.2 cm)	+10" to -4" (+25.4 cm to -10.2 cm)	+10" to -4" (+25.4 cm to -10.2 cm)	+10" to -4" (+25.4 cm to -10.2 cm)
5'8" (1.8 m)	7'3" (2.2 m)	8'6" (2.6 m)	10' (3.0 m)
Trailed, must choose drawbar or 2-point semi-mounted, Cat. 2 or 3N Quick hitch compatible	Trailed, must choose drawbar or 2-point semi-mounted, Cat. 2 or 3N Quick hitch compatible	Trailed, must choose drawbar or 2-point semi-mounted, Cat. 2 or 3N Quick hitch compatible	Trailed, must choose drawbar or 2-point semi-mounted, Cat. 2 or 3N Quick hitch compatible
9.5L - 15	9.5L - 15	9.5L - 15	9.5L - 15
1-3/8" - 6-spline	1-3/8" - 6-spline	1-3/8" - 6-spline	1-3/8" - 6-spline
Friction slip clutch standard	Friction slip clutch standard	Friction slip clutch standard	Friction slip clutch standard
540 (factory fitted) or 1,000 thru field kit conversion	540 (factory fitted) or 1,000 thru field kit conversion	540 (factory fitted) or 1,000 thru field kit conversion	540 (factory fitted) or 1,000 thru field kit conversion
Standard with friction slip clutch	Standard with friction slip clutch	Standard with friction slip clutch	Standard with friction slip clutch
40 hp (30 kW)	47 hp (35 kW)	54 hp (40 kW)	60 hp (45 kW)
2 DA	2 DA	2 DA	2 DA
Steel	Steel	Steel	Steel
Standard	Standard	Standard	Standard
2,520 lbs (1,143 kg)	2,800 lbs (1,270 kg)	2,920 lbs (1,324 kg)	3,000 lbs (1,360 kg)