GMD 1025 F front-mounted disc mowers

GMD 1025 F profile

When modern design and high-performance come together

Available in 2 cutting widths (3.10 and 3.50m), GMD 1025 F series disc mowers are ideal for hilly ground, and perfectly adapted to medium-sized farms and agricultural contractors.

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Successful farms today aim to improve profitability. It is necessary to provide the herd with highly nutritional forage while aiming for feed self-sufficiency. Lowering the level of impurities from 4 to 2 % per year, means gaining 89€/ha/year (study from the Chamber of Agriculture of Weser Ems - Germany), an advantage in a difficult agricultural context. Farmers can count on the high performance and reliability of KUHN's front-mounted GMD 1025 models to produce great quality forage. Two models are available: GMD 3125 F and GMD 3525 F. Hitch them to the tractor in combination with a triple GMD (GMD 8730, GMD 9530 or GMD 10030) to increase work output.
GMD 1025 F at work

Your benefits

Top forage quality for the herd

The LIFT-CONTROL system allows the mowing unit to adapt to uneven ground

LIFT-CONTROL hydro-pneumatic suspension produces clean forage

The hydro-pneumatic LIFT-CONTROL system with an accumulator replaces the traditional spring. The cutter is subject to rearward stress when working. When stress increases, the suspension system does too. This results in effective adaption to uneven ground. The sward is protected and less dirt gets into the swath.

A perfect cut with the OPTIDISC ELITE cutter bar

The new OPTIDISC ELITE cutter bar was developed with farmers. Variable spacing between the discs, large overlap zones and the reduced angle of the OPTIDISC cutter bar will provide you with the quality you need. The GMD 3125 F and GMD 3525 F front mowers are equipped with this cutter bar and its latest upgrades that guarantee a clean cut at all times. The OPTIDISC ELITE cutter bar includes exclusive features:
  • Spacing is reduced at the point where the discs diverge to increase knife overlap. This results in a clean cut even in light or short grasses. (A)
  • Distance is increased at the point where the discs converge. This makes more space for the crop to pass through which is quickly carried away to the rear so that the mower can do its job undisrupted. (B)
  • The overlap zone is almost doubled resulting in better cutting quality in damp sticky ground (or with mole hills), in heavy and laying crops, and in plant cover harvested at the end of autumn.
  • A smaller pitch angle: this prevents the undulating cut which is typical with close mowing. It also stimulates homogeneous and faster regrowth and makes it easier to adjust the machines that follow.
  • New disc bearings with exclusive shape and attachment which hold the knives firmly in place in the event of impact while granting 360° rotational freedom.
Soil can build up in front of a cutter bar on hilly plots or in wet and sticky conditions, but not with the OPTIDISC ELITE cutter bar! It has specially designed skids to improve gliding and preserve the sward. Another advantage for forage quality, especially in difficult conditions.
Variable spacing between discs on the OPTIDISC ELITE cutter bar

Great forage in a narrow swath

GMD 1025 F mowers have swathing drums on both sides that reduce the width of the swath by 20 cm compared to a classic swath. The wheels of the tractor no longer run over the crop.
With the GMD 3125 F, swath width is reduced by 20cm compared to a classic swath

Good ground contour following

The front mowers have two strong lower link arms mounted on large ball joints. The pivot points, tractor-side, are closer to the ground than the front ones. This dynamic loading creates better ground clearance and makes the mower unit more stable and effective in ground contouring, especially on hilly terrain. The mowing unit integrates pendulum-type articulation so it is more flexible and adapts to uneven plots. The pendulum-type movement provides a maximum tilt of 30°. Articulated arms allow for up to 70cm of vertical clearance.
With pendulum-type articulation, the mowing unit contours uneven ground

Save time and money

The shaft holding the disc shears in the event of a violent impact and protects the gearwheels

A mower to rely on at all times

The PROTECTADRIVE system is integrated into the cutter bar to withstand shocks and obstacles when mowing. In the event of a violent impact against one of the discs, the shaft holding the disc shears just above the bearing thanks to a carefully dimensioned shear groove. The gearwheels are protected. The machine is back up and running quickly and at a low repair cost.
The disc bearing stations are attached by long bolts that pass through the entire cutter bar. This eliminates any risk of the mounts being torn out of the cutter bar in case of impact.
Top-of-the-range components strengthen the centrepiece of the cutter bar:
  • Special disc-bearing station with a double row of angular contact ball bearings.
  • Large-diameter gear wheels in high-precision forged steel with 3 cogs engaged.
  • Discs with forged and heat treated cups over the whole surface area.
  • Disc skids in treated steel with the option of adding a protective layer (screw-on).
In order to lengthen the machine's service life, shock absorbers are integrated in the connection between cutter bar and chassis. The structure of the machine is less affected by impacts, especially when working at fast ground speeds.

Quick maintenance with the FAST-FIT knife-attachment system

The GMD 3125 F and GMD 3525 F front mowers are equipped with the FAST-FIT quick-release knife system as standard which provides 3 extra guarantees:
  • A powerful leaf spring provides constant pressure to the knife retainer: it is not restricted.
  • The knife retaining pins are also equipped with a shoulder to provide an additional level of securement.
  • The leaf spring can only be depressed to remove the knife at one point when the knife is centred over the shoe.
Therefore when the disc is rotating it is not possible for the knife to be released. To minimise costs the knife retention pin can be replaced separately from the leaf spring.
Cutting quality remains excellent owing to the compactness of the cutter bar and the exclusive shape of the blades which rotate as close as possible to the protective skids.
FAST-FIT quick-release knife attachment for quick and safe knife change

A flexible side guard protects against impact

The rubber side guard FLEXPROTECT can bend on impact without breaking or damaging the mower, before returning to its initial shape. This exclusive guard will save you money on repair costs.
The external side guard FLEXPROTECT protects the GMD 3125 F mower from obstacles

A mower that adapts to your plot

Combine your GMD 3125 F front mower with a GMD 1011 rear mower

Benefit from a wide overlap that can adapts to your plot

Front mowers can be used in combination with rear GMD mowers. Overlap width can be modified by 19cm with the offset of the rear GMD 1011 series model to create a clean cut on slopes and bends. It is possible to obtain an overlap of between 240 and 645 cm depending on the rear hitch and working width of the front unit. This is an advantage when using wide-track tractors or with wide tyres.

Quick and easy adjustments

Operating comfort is one of KUHN's priorities. On GMD 3125 F and 3525 F mowers, ground pressure is quick and easy to adjust with hydraulic suspension that maintains it at the right level. The mowing units are lifted at headlands with an integrated cylinder so the tractor's hydraulic front lift system is not used.
An integrated cylinder lifts the mowing unit at headlands

Easy manoeuvring and good visibility

Transport widths of 3.00m (GMD 3125 F) and 3.48m (GMD 3525 F) make the machines easier to handle, especially on the road. Optional wing mirrors are available for safer road travel.
The GMD 3125 F on the road

The GMD 3125 F mower at work with a GMD 4411


Technical characteristics

Working width (m)
Transport width (m)
Cutter bar
Number of discs with wear skids
Disc wear skid
Blade attachment
Cutting height range with standard skids (mm)
Gear train protection system
Ground following
Headland turning position
Average swath width (m)
Swathing system
PTO speed (min-1)
Overload protection
Free wheel
Theoretical tractor power requirement (kW/hp)
Required tractor hydraulic connections
Required tractor electrical connections
Road lights and signalling on front and rear
Approx. weight (kg)
GMD 3125 F-FF GMD 3525 F-FF
3.10 3.50
2.99 3.48
7 8
2 - as standard 2 - as standard
FAST-FIT quick release FAST-FIT quick release
35 to 65 35 to 65
PROTECTADRIVE safety system PROTECTADRIVE safety system
Pivoting link rods with upward movement Pivoting link rods with upward movement
LIFT-CONTROL hydro-pneumatic suspension LIFT-CONTROL hydro-pneumatic suspension
By hydraulic cylinder By hydraulic cylinder
1.00 - 1.20 1.00 - 1.20
2 PTO driven drums 2 PTO driven drums
3-point - Cat. 2 3-point - Cat. 2
1000 (left or right direction of rotation) - Factory setting: to the right (seen from the tractor seat) 1000 (left or right direction of rotation) - Factory setting: to the right (seen from the tractor seat)
Friction slip clutch Friction slip clutch
Integrated into the side gearbox Integrated into the side gearbox
32 / 43 36 / 49
1 SA 1 SA
7-pin plug 7-pin plug
As standard As standard
1105 1180