Mounted disc mowers GMD 10 - 100 | KUHN farm machinery

Mowers with a simple and reliable design

The different widths of GMD 10 and GMD 100 series are adapted to small and medium farm operations. They combine a simple structure with many different features.
These machines produce a clean and even cut. Their cutter bar is highly effective and robust.

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Benefits
Specifications
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Mowers in the GMD 10 and GMD 100 series are adapted to small and medium farm operations that require high standards in terms of dependability and cutting quality. Their compact design makes them perfectly compatible with smaller hp tractors. They are equipped with the 100 series cutter bar (except GMD 355 which has the OPTIDISC cutter bar) and other equipment that gives them the strength necessary for mowing operations.
GMD 10 Series comprises 4 models from 1.60 to 2.80 metres: GMD 16 (1.60 m), GMD 20 (2.00 m), GMD 24 (2.40 m), GMD 28 (2.80 m). GMD 100 Series includes 4 models from 2.40 to 3.51 metres: GMD 240 (2.40 m), GMD 280 (2.80 m), GMD 310 (3.10 m), GMD 355 (3.51 m).

A simple, reliable design

The extremely reliable 100 series cutter bar

The cutter bar has been designed to cope well with obstacles. Being equipped with the PROTECTADRIVE safety system, in the event of a violent impact between a disc and an obstacle, the shaft holding the disc can shear just above the bearing thanks to a calculated shear groove. Therefore gearwheels are protected. In less than 15 minutes, the machine can be back up and running at a low repair cost. 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 gearwheels made from high precision forged steel with 3 cogs engaged.
Specific design of gearboxes, which prevents any stress on the attachment screws.
Knife attachment in forged steel cup. Fully heat treated discs to reduce wear.

Breakaway safety mechanism protects the mower unit

Should the machine hit an obstacle, the safety breakaway mechanism causes the mower unit to slighly pivot backwards so the impact is significantly reduced. You can reset the device simply by reversing.

FAST-FIT: 100% safe knife attachment

All GMD 10 series and GMD 100 series mowers have bolting knife attachment system.
GMD 240 to 355 models can be fitted with the FAST-FIT quick release knife system which comes with 3 extra guarantees:
- A powerful leaf spring provides constant pressure on the knife retainer but the knife is not restricted.

The knife retaining pins are also equipped with a shoulder to provide an additional level of security.
The leaf spring can only be pressed to remove the knife at one point when the knife is centred over the attachment.

Therefore, when the disc is rotating the knife cannot come loose. In order to keep maintenance costs down, the retaining pins and the leaf spring can be replaced separately.
Cutting quality remains just as excellent as the cutter bar is compact and the blades have an exclusive shape, which enables them to work extremely close to the protective skids.

Forage quality

Perfect ground contour following

The articulated cutting unit follows ground contours with maximum accuracy, even when mowing banks or ditches.
The mower unit's suspension system is equipped with a spring, which adapts the cutter bar floatation to field undulations.
On the GMD 100 series models, the lift and suspension system allows both the cutter bar and the inner skid to be raised off the ground using only the mower’s hydraulic cylinder. The tractor’s 3-point hitch stays at the same pre-set height. A hydraulic limiter gently stops the mower unit lifting when crossing swaths. This is a great advantage when working on slopes.
The distance between the cutter bar and the tractor's rear wheels is very short. This enables the cutter bar to react quickly to changes in the field and ensures a uniform cutting height.
The discs are specially designed to clear forage to the rear of the mower quickly to prevent grass from being cut again.
On the GMD 355 model, the residual ground pressure of the mowing unit is controlled by a hydraulic cylinder linked to an accumulator.

A wide range of operating possibilities

The kinetics of the mowing unit's articulation make it possible to mow banks and terraces at a tilt angle of up to 35° and down to 25° depending on the model (-30° for the GMD 355).

Kinetics capable of angles from -25° to 35°

Perfectly formed swaths

A swath wheel is mounted behind the outer disc cone and separates cut crop from uncut crop so that the right hand wheels of the tractor drive over the ground rather than the cut crop. The advantages of a swath wheel over a swath board are:

It fits entirely under the curtain.
It has no ground contact.
Damage by reversing or turning is eliminated.

Perfectly formed swaths due to the swath wheel

Easy to operate, fast settings

One tool for all adjustments

One tool, supplied with the mower performs all the following tasks:

adjusting the floatation spring,
unlocking the safety cover,
adjusting the belt tension,
replacing knives (if bolted),

No time to lose during high season

The disc bearing is quick and easy to remove on the 100 series cutter bars so any repairs can be carried out cheaply and with minimum down time.
To save time during high season, GMD 240, 280 and 310 disc mowers are equipped with a drive shaft that only needs to be greased every 100 hours.
Only four nipples have to be greased.
Semi-automatic belt tensioning is accurate and easy.

Changing the disc bearing on the 100 series cutter bar

Linkage compatibility

GMD 240 to 310 mowers have an offset range of 50 mm to the left and right which ensures full cutting width when the mower is attached to tractors with different track widths.
A longer left hitch pin is available to increase the offset of GMD 240 to 310 models by up to 200 mm to the right.
GMD 240, 280 and 310 models are compatible with tractor linkage systems that are equipped with a category 2. quick-Hitch frame. You just have to put a pin in place -this is available as an option.

Specifications

Technical characteristics


Working width (m)
Number of discs with wear skids
Blade attachment
Cutting height range with standard skids (mm)
Gear train protection system
Suspension
Safety breakaway
Mowing angle
Headland turning position
Average swath width (m)
Swath wheel position
Hitch
Setting into transport position
PTO speed (min^-1)
Free wheel
Theoretical tractor power requirement (kW/hp)
Required tractor hydraulic connections
Approx. weight (kg)

GMD 16	GMD 20	GMD 24	GMD 28	GMD 240-FF	GMD 280-FF	GMD 310-FF
1.60	2.00	2.40	2.80	2.40	2.80	3.10
4	5	6	7	6	7	8
Bolted	Bolted	Bolted	Bolted	FAST-FIT	FAST-FIT	FAST-FIT
30 - 50	30 - 50	30 - 50	30 - 50	30 - 50	30 - 50	30 - 50
PROTECTADRIVE safety system	PROTECTADRIVE safety system	PROTECTADRIVE safety system	PROTECTADRIVE safety system	PROTECTADRIVE safety system	PROTECTADRIVE safety system	PROTECTADRIVE safety system
With spring	With spring	With spring	With spring	With spring	With spring	With spring
As standard by mechanical lock	As standard by mechanical lock	As standard by mechanical lock	As standard by mechanical lock	As standard by mechanical lock	As standard by mechanical lock	As standard by mechanical lock
+35° / -22° (-40° with optional kit)	+35° / -22° (-40° with optional kit)	+35° / -15°	+35° / -15°	+35° / -25°	+35° / -25°	+35° / -25°
With tractor lift	With tractor lift	With tractor lift	With tractor lift	By integrated hydraulic cylinder	By integrated hydraulic cylinder	By integrated hydraulic cylinder
1.10	1.40	1.70	2.00	1.70	2.00	2.40
As standard - External	As standard - External	As standard - External	As standard - External	As standard - External	As standard - External	As standard - External
3-point - Cat. 1 and 2	3-point - Cat. 1 and 2	3-point - Cat. 2	3-point - Cat. 2	3-point - Cat. 2	3-point - Cat. 2	3-point - Cat. 2
Vertical folding with hydraulic cylinder and automatic lock	Vertical folding with hydraulic cylinder and automatic lock	Vertical folding with hydraulic cylinder and automatic lock	Vertical folding with hydraulic cylinder and automatic lock
540	540	540	540	540	540	540
As optional equipment	As optional equipment	As optional equipment	As standard	As standard	As standard	As standard
15 / 21	19 / 26	23 / 31	27 / 36	23 / 31	27 / 36	30 / 41
1 SA	1 SA	1 SA	1 SA	1 SA (+ 1 extra DA required if setting into transport position chosen is by rearward hydraulic breakaway combined with mechanical safety breakaway)	1 SA (+ 1 extra DA required if setting into transport position chosen is by rearward hydraulic breakaway combined with mechanical safety breakaway)	1 SA (+ 1 extra DA required if setting into transport position chosen is by rearward hydraulic breakaway combined with mechanical safety breakaway)
420	465	544	600	601	659	716