GA 4121 GM / 4321 GM Single-Rotor Rotary Rakes


Meeting the Challenge of Varying Field Conditions

Large working widths, fast working speeds and increased maneuverability allow for outstanding productivity with these single-rotor mounted rotary rakes. The working width of these models varies from 13’5” to 13’9”.

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The KUHN GA single-rotor mounted rotary rakes are designed to meet the needs of hay producers who demand higher productivity, while they increase the quality of their hay and forage crops. Large, well-formed windrows promote faster drying, enabling producers to harvest crops at their peak nutritional value with less reliance on the weather.

Drive components are protected from debris in the fully enclosed, heavy-duty, double reduction Masterdrive® GII gearbox which requires minimal maintenance. The pivoting headstock, on the GA 4121 GM and GA 4321 GM mounted models, ensures maneuverability, improved terrain following, raking quality and consistent windrow shape. Hyper-tangential, double-curved tine arms allow these rakes to work at various speeds, while still gently raking, assuring raking quality. Since the tines do not normally contact the soil, there is less opportunity for contaminants to enter the windrow, resulting in higher forage quality.

Your benefits

Proven and Durable Raking Components


Masterdrive® GII Gearbox

The KUHN exclusive Masterdrive double-reduction gearbox is designed for all types of crops, larger rotors, and demanding conditions. The fully enclosed Masterdrive double-reduction gearbox incorporates a two-stage reduction drive for increased durability and reliability with a longer service life and lower power requirement. The large gears and gear teeth are meshed together with tight clearances to minimize wear and provide the best overall power transmission for maximum efficiency.

Double-Curved Tine Arms

Double-curved tine arms are designed to form fluffy and straight windrows for superior raking quality at high speeds. Fluffy windrows allow more air movement through the crop promoting fast and uniform drying!

KUHN rotary rakes achieve this by following two basic principles for ideal windrow formation. First, the tine arms maintain a positive forward position right up to the point where the forage is delivered to the windrow ensuring gentle crop handling and minimal ash incorporation. Second, a steep cam track allows the tines to be raised very quickly to provide additional clearance over the windrow.

Maximum Operator Efficiency and Comfort


Right-Hand Delivery

For maximum operator efficiency and comfort, right-hand delivery is ideal. All KUHN single-rotor rakes above a 13’ working width feature right-hand delivery as standard due to the double-reduction Masterdrive® GII gearbox. You can monitor raking quality and make adjustments at the same time with both the windrow and tractor controls conveniently located on the right side.

Narrow Transport Width

Road transport can be accomplished with complete peace of mind – simply store the tine arms in the convenient rack at the front of the machine and fold up the guards vertically. Lighting and turn signals are also standard for maximum safety.

Spring Design

The right guard and windrow deflector can be easily raised and lowered with the assistance of the convenient spring design.

Swath Curtain Adjustment

A parallelogram linkage simultaneously moves the swath curtain to the rear as it is extended. This improves windrow formation and placement by ensuring the curtain is always in the proper position relative to the crop.

Superior Ground Adaptation


Tandem Axles

Equipped with standard tandem axles, GA trailed rotary rakes are designed to handle uneven ground. They smooth out bumps and holes keeping the distance between the ground and tines constant. The close positioning of the wheels to the tines provides smooth operation.

Prop Wheel

All mounted KUHN rotary rakes can be fitted with an additional prop wheel at the front of the rotor. This additional wheel provides improved raking performance and enhanced following of changing ground contours.

Second Dampener

GA 4321 GM mounted models are available with an optional second dampener. This will allow these models to run more smoothly over bumpy and hilly fields.



Working width - includes windrow
Clean swept width
Windrow width
Transport width
Transport width with arms removed
Lift height under tines
Double curved tangential mounted tine arms
Frame stabilizer
Foldable safety guards
Rotor diameter
Number of tines per tine arm
Number of tine arms
Fully enclosed gearbox
Removable tine arms
Tandem axles
Hydraulic lift mechanism
PTO speed
Wide angle PTO shaft
Minimum PTO power requirement
Road lights and signaling
Machine net weight approx.
Safety chain
GA 4121 GM GA 4321 GM
13'5" (4.1 m) 13'9" (4.2 m)
9'2" (2.8 m) 9'7" (2.9 m)
4'3" (1.3 m) 4'3" (1.3 m)
- -
5'8" (1.7 m) 6'4" (2.0 m)
> 24" (61 cm) > 24" (61 cm)
Standard Standard
Optional Standard
Standard Standard
10'6" (3.2 m) 11'1" (3.4 m)
4 4
10 12
Masterdrive GII Masterdrive GII
Standard Standard
Optional Standard
16 x 6.5-8 16 x 6.5-8
- -
540 rpm 540 rpm
- -
3-point, Cat. 1 and 2 3-point, Cat. 2
30 hp (22 kW) 30 hp (22 kW)
Optional Optional
1,436 lbs (651 kg) 1,642 lbs (745 kg)
- -



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