GA 8131 / 8731+ / 9531+ Twin-Rotor Rotary Rakes


Create the Perfect Windrow!

The GA 8131, 8731+ and 9531+ central-delivery rakes, with high production and excellent raking cleanliness, creates the ideal windrow for forage chopping and making round or large square bales.

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The GA 8131, 8731+ and 9531+ center-delivery twin-rotor rotary rakes are built on the popularity of the prior generation of KUHN’s twin-rotor rakes with the incorporation of the Masterdrive® GIII double-reduction gearbox. The main gearbox features the KUHN exclusive double reduction drive that not only provides consistent windrow formation in varying crop conditions, but also improves the power flow through the gearbox. These models have a lighter, but stronger construction with aluminum rake arm housings, large cam bearings and cam track designed to reduce peak loads. They maintain the KUHN double-bend tine arm design that offers clean raking and excellent capacity for consistent, fluffy windrows. The GA 8731+ has fixed tine arms. For operations where transport height is a concern, the GA 8131 and GA 9531+ have easily removable tine arms.

Your benefits

Heavy-Duty Components for Long Service Life


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 crop, handle dry hay gently, and create a uniform windrow is unrivaled in the industry.

Double-Curved Tine Arms

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.

Superior Ground Adaptation & Stability


3D Suspension

High-quality raking is only possible if the rotors are able to follow undulating terrain smoothly and closely without damaging the crop stubble. The GA 8131, 8731+ and 9531+ features 3D rotor articulation for excellent field adaptation. The rotor arm and rotor are connected by a double link rod which enables the 3D articulation, rotors follow ground contours efficiently to help you harvest a cleaner crop.​

Rotor Wheels and Adjustable Tine Height

Tine height adjustments are made on each rotor with a simple hand crank. Each rotor on the GA 8131 comes standard with a set of front fixed wheels with two fixed axles at the back. The GA 8731+ features a set of front caster wheels with two fixed axles at the back of the rotor to help follow changing ground contours to avoid tines from striking the ground. The GA 9531+ comes standard with a set of front caster wheels and a set of tandem axles in the rear, ideal for traveling over pivot tracks.

Rotor Lift

Both rotors can be quickly lifted with a single-acting hydraulic valve for lifting over obstacles and automatically locking the rotor lift during turns at field headlands to eliminate rotor swinging.

Easily Make Adjustments for Your Rake


Adjustable Working Width

Easily adjust the working width hydraulically from the seat of the tractor.​ The working width can be adjusted from 23’4” to 26’3” (7.1 – 8.0 m) on the GA 8131, 25’3” to 28’2” (7.7 – 8.6 m) on the GA 8731+ and an adjustable working width from 27’6’’ to 30’6’’ (8.4 – 9.3 m) on the GA 9531+.

Control Box

On the GA 8731+ and 9531+, the KGA 04C control box comes standard. The control box manages all the functions such as rotor working height adjustment, individual rotor lift (if machine is equipped with these options), rotor lift at headlands, working and windrow width adjustments. Simplified folding and unfolding between transportation and field working positions is also controlled from the control box for operator convenience. The KGA 01S control box is optional on the GA 8131.




Working width - includes windrow
Swath type - working width including windrow
Clean swept width
Windrow width
Transport width
Transport height
Double curved tangential mounted tine arms
Foldable safety guards
Number of rotors
Vertical hydraulic folding rotors
Rotor diameter
Number of tines per tine arm
Number of tine arms
Center swath curtain
Fully enclosed gearbox
Removable tine arms
Working height adjustment
Rotor flotation
Spare rotor wheel
Transport tires
Rear wheel steering
Tires on each rotor
PTO speed
Overrunning clutch on PTO
Minimum PTO power requirement
Required tractor hydraulic connections
Control box
Road lights and signaling
Machine net weight approx.
Check chain
GA 8131 GA 8731+ GA 9531+
23'4" - 26'3" (7.1 - 8.0 m) 25'3" - 28'2" (7.7 - 8.6 m) 27'6" - 30'6" (8.4 - 9.3 m)
Center delivery (1 windrow) Center delivery (1 windrow) Center delivery (1 windrow)
19'6'' (5.9 m) 21'4'' (6.5 m) 23'6'' (7.2 m)
4'3" - 7'3" (1.3 - 2.2 m) 4'6" - 7'5" (1.4 - 2.3 m) 4'6" - 7'5" (1.4 - 2.3 m)
9'2" (2.8 m) 9'9" (2.99 m) 9'9" (2.99 m)
19'4" (5.9 m) 21'6" (6.57 m) 21'6" (6.57 m)
13'1" (4.0 m) or 11'2" (3.4 m) with tine arms removed 13' (3.99 m) tine arms not removable 14'3" (4.40 m) or 12'4" (3.82 m) with tine arms removed
Standard Standard Standard
Standard Standard Standard
2 2 2
Standard Standard Standard
11'1" (3.4 m) 12' (3.7 m) 13'1" (4.0 m)
4 4 4
12 13 15
Optional Optional Optional
Masterdrive GIII Masterdrive GIII Masterdrive GIII
Standard Fixed Standard
Hydraulic By crank handle (hydraulic as option) By crank handle (hydraulic as option)
3-D terrain following 3-D terrain following 3-D terrain following
Optional Standard Standard
11.5 x 80-15.3 15/55-17 15/55-17
Standard Standard Standard
4-16 x 6.50-8 4-16 x 6.50-8 6-16 x 6.50-8
540 rpm 540 rpm 540 rpm
Standard Standard Standard
2-point, Cat. 2 and 3N 2-point - Cat. 2 and 3N pivoting links 2-point - Cat. 2 and 3N pivoting links
60 hp (45 kW) 68 hp (50 kW) 75 hp (55 kW)
1 SA and 1 DA 1 SA +1 DA (+ 1 DA if hydraulic raking height adjustment) 1 SA +1 DA (+ 1 DA if hydraulic raking height adjustment)
Optional KGA 01S Standard KGA 04 C Standard KGA 04 C
Standard Standard Standard
4,244 lbs (1,925 kg) 4,960 lbs (2,250 kg) 5,290 lbs (2,400 kg)
Standard Standard Standard