GA 13231 / 15231 Quad-Rotor Rotary Rakes

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The 100% Hydraulically Driven Rake!

With impressive working widths, ranging from 27’7” to 48’3”, KUHN GA 13231 and GA 15231 quad-rotor rotary rakes offer the ultimate capacity.

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KUHN's quad-rotor rotary rakes have the size and performance for even the most demanding operations. Working widths from 27' 7" to 48' 3" cover large areas quickly, while double-bent tine arms create fluffy windrows while gently handling crop, preserving nutrient content. KUHN's Masterdrive® GIII double-reduction gearbox's ability to move heavy wet crop, handle dry hay gently, and neatly windrow forage is unrivaled in the industry.

KUHN GA 13231 and GA 15231 quad-rotor rotary rakes reduce maintenance costs due to their comprehensive list of innovative features, including the hydraulic rotor drive. These rakes are easy to operate and adjust. All settings are made hydraulically from the tractor seat via the ISOBUS monitor.

Your benefits

Heavy-Duty Components for Superior Raking


Masterdrive® GIII Gearbox

The patented KUHN Masterdrive GIII double-reduction gearbox is designed for heavy crops, tough field conditions, and intensive use. Key components have been improved to build lighter, yet stronger rotors such as: aluminum alloy housings, optimized cam track minimizing force on the follower bearing, larger follower bearing diameter reducing rotation speed and pressure on the cam, tine arms with large-dimension bearings, sturdier pivoting tine support shaft, reinforced main shaft, and reinforced mounting of tine arms on tine holders. The Masterdrive GIII’s ability to move heavy wet crop, handle dry hay gently, and neatly windrow forage is unrivaled in the industry.

Double-Curved Tine Arms

Hyper-tangential, double-curved tine arms are designed to form fluffy and straight windrows for superior raking quality at higher 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.

3D Rotor Articulation

Suspended on an articulation joint and independent from the main frame, the rotors can pivot in all directions allowing close ground following over undulating terrain. The tines collect the crop with the greatest precision.

Jet Effect

A hydraulic cylinder at the front of the rotor head controls the “touchdown” when lowering the rotor. In a similar way to an airplane, the rear touches first with the front following. This ensures that the tines do not strike the soil.

Quick and Easy Working Adjustments


Smart Headland Management

For easy and efficient headland turns at the end of the field, an automated pre-programmed headland sequence can be utilized on the ISOBUS monitor. The headland sequence can be adapted to specific needs and thanks to angle sensors, the rotors will always be raised to the pre-defined height regardless of working width. Once all pre-adjustments are done, you only need to press a button, then sit back and let the electronics do the work.

Adjustable Working Width

The working width is adjusted from the ISOBUS monitor, making this adjustment easy for the operator. The front rotors can be moved independently from the rear rotors to choose a desired working width. Then adjust your rear rotors to create a windrow width to best match your harvesting equipment.

Raking Height Adjustment

The raking height is easily adjusted from the operator’s seat. This can be done simultaneously for the two front or the two rear rotors, as well as individually for each single one. The current height is indicated both on the terminal’s display and the rotor undercarriage.

Hydraulics to Increase the Machine’s Working Power


Self-Contained Hydraulic Unit

The hydraulic unit of the GA 13231 and GA 15231 is mounted on the pivoting headstock of the machine frame. In this way the primary drive shaft is always aligned to the tractor, even in tight corners. Moreover, you can adapt the PTO speed from the cab according to type and volume of forage. The hydraulic drive considerably simplifies the machine and provides multiple solutions for improved work.

Boost Function

From the ISOBUS monitor, the rotation speed of the front rotors can be increased by 20% compared to the rear rotors. The boost function projects the forage toward the center of the machine, spreading the forage across the width of the rear rotor. This puts less stress on the rear rotor, allowing them to create a fluffy and uniform windrow. This is ideal for perfecting the forage drying process.




Working width
Windrow width
Transport width
Transport height
Number of rotors
Rotor diameter
Number of tines per tine arm
Number of tine arms
Fully enclosed gearbox
Ground adaptation
Working height adjustment
Rotor flotation
Individual working width adjustment of the front rotors
Spare rotor wheel
Transport tires
Machine control
Rotor drive
PTO speed
PTO shaft
Minimum PTO power requirement
Required tractor hydraulic connections
Required tractor electrical connections
Road lights and signaling
Machine net weight approx.
GA 13231 GA 15231
27'7" - 41' (8.4 - 12.5 m) 31'2" - 48'3" (9.5 - 14.7 m)
4'7" - 7'10" (1.4 - 2.4 m) 4'7" - 8'2" (1.4 - 2.5 m)
9'10" (3.0 m) 9'10" (3.0 m)
32'8" (10.0 m) 35'9" (10.9 m)
12'11" (3.9 m) 13'1" (3.95 m)
4 4
10'6" (3.2 m) 2 x 12'4" (3.8 m) and 2 x 13'1" (4.0 m)
4 4
Fixed, 11 in front, 12 on rear Fixed, 13 in front, 15 on rear
Masterdrive GIII Masterdrive GIII
3D suspension 3D suspension
Standard via ISOBUS Standard via ISOBUS
Constant hydraulic suspension, automatically adjusted according to the working width (standard on front rotors) Constant hydraulic suspension, automatically adjusted according to the working width (standard on front rotors)
Standard via ISOBUS Standard via ISOBUS
2 as standard 2 as standard
4 tires per rotor, 16 x 6.50-8 4 tires per rotor, 18 x 8.50-8
500/60-22.5 600/50R-22.5
via ISOBUS terminal via ISOBUS terminal
Self-contained hydraulic Self-contained hydraulic
1,000 rpm 1,000 rpm
1 3/8" - 21-spline 1 3/8" - 21-spline
2-point, Cat. 2 and 3N 2-point, Cat. 2 and 3N
95 hp (70 kW) 114 hp (85 kW)
LS connection: 1 x Pressure, 1 x Free return, 1 x load sensing LS connection: 1 x Pressure, 1 x Free return, 1 x load sensing
1 x 7 pin light connection, ISOBUS plug, 12V power 1 x 7 pin light connection, ISOBUS plug, 12V power
Standard Standard
11,355 lbs (5,150 kg) 13,670 lbs (6,200 kg)
Hydraulic Hydraulic
Technical Characteristics
Basic machine delivered assembled (except optional equipment)
GA 13231 GA 15231
Yes xx new Yes xx new


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