ID # 25080120

Kuhn - GA 8131 / GA 8731 / GA 9531

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Kuhn GA 8131 / GA 8731 / GA 9531
Durability Meets Comfort

 You will appreciate the increased comfort of the KUHN GA 8131, 8731 and 9531 with their minimum maintenance, easy adjustments and increased stability during transport, especially while turning or on slopes. Working widths range from 23’4” to 30’6”.

KUHN GA 8131, 8731 and 9531 twin-rotor, center-delivery rotary rakes gently handle high volumes of hay and efficiently move it into high-quality windrows. They have the ability to move both wet and dry crops alike, while keeping your productivity high and maintenance requirements low. These semi-mounted rakes are known for their superior ground adaptation, durability and reliability, thanks to the Masterdrive® GIII gearbox. This KUHN-patented double reduction gearbox is the most reliable, heavy-duty gearbox available in the industry. 3D rotor articulation helps the rakes adapt quickly to varying field conditions, while the double-curved tine arms gently handle the crop and allow you to operate at higher working speeds. Working widths, ranging from 23’4” to 30’6” depending on the model, can easily be adjusted from the comfort of your tractor seat.



GA 8131 / GA 8731 / GA 9531
Sale Type
  GA 8131 GA 8731 GA 9531
 Working width - includes windrow 23'4" - 26'3" (7.1 - 8.0 m) 25'3" - 28'2" (7.0 - 8.6 m) 27'7" - 30'6" (8.4 - 9.3 m)
 Swath type - working width including windrow Center delivery (1 windrow) Center delivery (1 windrow) Center delivery (1 windrow)
 Clean swept width - - -
 Windrow width 4'3" - 7'3" (1.3 - 2.2 m) 4'7" - 7'6" (1.4 - 2.3 m) 4'7" - 7'6" (1.4 - 2.3 m)
 Transport width 9'2" (2.8 m) 9'10" (3.0 m) 9'10" (3.0 m)
Length 19'4" (5.9 m) 21'6" (6.6 m) 21'6" (6.6 m)
 Transport height 13'1" (4.0 m) or 11'2" (3.4 m) with arms removed 13'1" (4.0 m) 14'6" (4.4 m) or 12'6" (3.8 m) with arms removed
 Double curved tangential mounted tine arms Standard Standard Standard
 Foldable safety guards Standard Fixed Standard
 Number of rotors 2 2 2
 Vertical hydraulic folding rotors Standard Standard Standard
 Rotor diameter 11'1" (3.4 m) 12' (3.7 m) 13'1" (4.0 m)
 Number of tines per tine arm 4 4 4
 Number of tine arms 12 13 15
 Center swath curtain Optional Optional Optional
 Fully enclosed gearbox Masterdrive GIII Masterdrive GIII Masterdrive GIII
 Removable tine arms Standard - Standard
 Working height adjustment Hydraulic Hydraulic Hydraulic
 Rotor flotation 3-D terrain following 3-D terrain following 3-D terrain following
 Spare rotor wheel Optional Standard Standard
 Transport tires 11.5 x 80-15.3 11.5 x 80-15.3 11.5 x 80-15.3
 Rear wheel steering Standard Standard Standard
 Tires on each rotor 4-16 x 6.50-8 4-16 x 6.50-8 6-16 x 6.50-8
 PTO speed 540 rpm 540 rpm 540 rpm
 Overrunning clutch on PTO Standard Standard Standard
 Hitch 2-point, Cat. 2 and 3N 2-point, Cat. 2 and 3N 2-point, Cat. 2 and 3N
 Minimum PTO power requirement 60 hp (45 kW) 68 hp (50 kW) 75 hp (55 kW)
 Minimum hydraulic pressure - - -
 Required tractor hydraulic connections 1 SA and 1 DA 1 SA and 1 DA 1 SA and 1 DA
 Control box Optional KGA 01S Standard KGA 02C Standard KGA 02C
 Road lights and signaling Standard Standard Standard
 Machine net weight approx. 4,244 lbs (1,925 kg) 4,960 lbs (2,250 kg) 5,290 lbs (2,400 kg)
 Check chain Standard Standard Standard
your benefits

Heavy-Duty Components for Long Service Life

Kuhn GA 8131 / GA 8731 / GA 9531 Masterdrive® 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 corn stalks is unrivaled in the industry.

Kuhn GA 8131 / GA 8731 / GA 9531 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.

Superior Ground Adaptation & Stability

Kuhn GA 8131 / GA 8731 / GA 9531 3D Suspension

Four wheels on each rotor are positioned close to the tines and 3D suspension allows superior ground adaptation of the rotors on the GA 8731 for better raking. The four wheels also provide more stable operation in rough fields. For even more stability and greater ground adaptation, six wheels per rotor are standard on the GA 9531. An additional tandem axle is also available on the GA 8731 to bring the standard wheels per rotor from four wheels to six.

Kuhn GA 8131 / GA 8731 / GA 9531 Low Transport Height

A practical plus of the GA 8731 is that transport remains low without having to remove any tine arms. This makes traveling from one field to the next more efficient. GA 8731 transport height is 13’1” without the removal of tine arms. GA 9531 transport height is 14’6” without the removal of tine arms 12’6” with tine arms removed.

Kuhn GA 8131 / GA 8731 / GA 9531 Locked Rotors – For Transport

The rotors are locked hydraulically and mechanically in their transport position. This considerably increase the machine’s stability during transport, even on poorly maintained roads.

Easily Make Adjustments for Your Rake

Kuhn GA 8131 / GA 8731 / GA 9531 Electric Control Boxes

The GA 8731 and GA 9531 come with the KGA 02C control box as standard equipment. The box allows the operator to easily switch from field and transport modes, set windrow width and optionally lift each rotor individually. The KGA 11C control box is available as an option to also enable individual, or linked hydraulic rotor height adjustment. The GA 8131 offers the optional KGA 01S control box to enable individual rotor lift or individual rotor height adjustment from the tractor cab.

Kuhn GA 8131 / GA 8731 / GA 9531 Simple Height Adjustment

All you need is a hand crank to manually change the rotor height. A standard gauge on the machine makes accurate adjustment easy. Hydraulic height adjustment is available as an option on both models with the KGA 11C control box.

Kuhn GA 8131 / GA 8731 / GA 9531 Windrow Width Adjustments

The windrow width is also easy to adjust. Working width is easily adjusted on the control box from the tractor seat to adapt to varying conditions or harvesting equipment.

Kuhn GA 8131 / GA 8731 / GA 9531 Optional Independent Rotor Lift

With the optional independent rotor lift, rotors can be lifted individually where clearance of more than 29” is possible. You will no longer have to worry about disturbing windrows when you pass over them.