GA 4121 GM / 4220 TH / 4221 GTH / 4321 GM


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 and trailed 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 and trailed 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® 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. While the simple clevis hitch, on the GA 4220 TH and GA 4221 GTH trailed models, allows you to quickly hookup and go. 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.


Mounted Models: GA 4121 GM and GA 4321 GM. Trailed Models: GA 4220 TH and GA 4221 GTH.

Your benefits

Proven and Durable Components to Assist You with Raking


Masterdrive® 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

Superior Ground Adaptation



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
Tine arm mounting
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
Shipping information: gross total weight
GA 4121 GM GA 4220 TH GA 4221 GTH GA 4321 GM
13'5" (4.1 m) 13'5" (4.1 m) 13'5" (4.1 m) 13'9" (4.2 m)
9'2" (2.8 m) 9'2" (2.8 m) 9'2" (2.8 m) 9'7" (2.9 m)
4'3" (1.3 m) 4'3" (1.3 m) 4'3" (1.3 m) 4'3" (1.3 m)
- 11' (3.3 m) - -
5'8" (1.7 m) - 6'5" (2.0 m) 6'4" (2.0 m)
> 24" (61 cm) 16" (41 cm) 16" (41 cm) > 24" (61 cm)
Standard Standard Standard Standard
Optional - - Standard
Standard - Standard Standard
10'6" (3.2 m) 10'6" (3.2 m) 10'6" (3.2 m) 11'1" (3.4 m)
4 4 4 4
10 11 11 12
Masterdrive GI Masterdrive GI Masterdrive GI Masterdrive GI
Standard - Standard Standard
Optional Standard Standard Standard
16 x 6.5-8 18 x 8.5-8 18 x 8.5-8 16 x 6.5-8
- Standard Standard -
540 rpm 540 rpm 540 rpm 540 rpm
- Standard Standard -
3-point, Cat. 1 and 2 Drawbar Drawbar 3-point, Cat. 2
30 hp (22 kW) 30 hp (22 kW) 30 hp (22 kW) 30 hp (22 kW)
Optional Optional Optional Optional
1,190 lbs (540 kg) 1,290 lbs (585 kg) 1,380 lbs (625 kg) 1,547 lbs (702 kg)
- Standard Standard -
1,436 lbs (651 kg) 1,600 lbs (726 kg) 1,675 lbs (760 kg) 1,642 lbs (745 kg)


Available applications: Single-Rotor Rotary Rakes

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