Twin-rotor rakes GA 1031

Robustness meets comfort

GA 7631, GA 8131, GA 8131 CL, GA 8731+ and GA 9531 + twin rotor rakes deliver central windrows. Grass is raked across a width of 7.50 m to 9.30 m. The GA 8131 CL model is equipped with a pick-up lift system, exclusive on the market!

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Benefits
Specifications
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GA 7631, GA 8131, GA 8131 CL, GA 8731+ and GA 9531+ semi-mounted rakes stand out from competing models by their robustness, reliability, and ground following capacity. With working widths of 7.50 to 9.30 m, work output is high while ground contouring remains excellent. The MASTERDRIVE GIII rotor-drive system, makes these rakes effective in difficult conditions. You can form uniform and airy windrows that are easier to pick up by the harvesting tool that follows.

Managing the heaviest forage

MASTERDRIVE GIII gearbox: reliable and wear-resistant

Today, farm machinery must work more and more hectares and withstand ever higher forces. Machine reliability and durability are the key to meet the requirements of users in terms of work output. The MASTERDRIVE GIII gearboxes have been developed to provide full protection of the drive components and improve wear resistance. This design ensures exceptional reliability and durability even for intensive use.
It includes a double reduction system with a bevel gear and a cylindrical gear. Bevel-reduction tolerances are tightly controlled making the system extremely reliable and robust, even in difficult conditions.
Gearbox wear is greatly reduced and no maintenance is required. The double reduction system makes it possible to include larger cylindrical gears with more teeth for better power transmission.

Robust attachments

The MASTERDRIVE GIII gearbox has been designed to cope with ever increasing stress on the drive mainly due to: Increasing working widths and rotor diameters, raking heavier crops such as silage, haylage, straw and hay.

Important components have been strengthened to make the rotors lighter yet more robust:

Aluminium housings.

Optimised cam track to reduce forces on the roller.

Larger diameter roller to reduce rotation speed and pressure on the cam.

Tine arms with large diameter bearings.

Stronger pivoting-tine-arm shaft.

Reinforced main shaft.

Reinforced mounting of the tine arms on the tine holders (bolted).

Top quality forage

The GA 8131 CL model is equipped with a pick-up lift system

The GA 8131 CL rake is an exclusive model on the market and meets the expectations of the most demanding customers in terms of forage quality. It is equipped with a central crop lifter positioned in front of the rotors. The lifter lifts and aerates the forage present in the central area which is not mown with a "conventional" rake. Drying is then optimized and the final quality increased. The lifter is controlled with the tractor valves.

The deflector creates a nice even windrow. Adjustments such as the rotor speed or deflector position make it possible to adapt the raking to the type of crop. Thus, the risk of leaf loss is eliminated, and the work output remains constant.

Ground following is ensured with the large vertical and angular travel ranges.

Operation remains simple with automatic lifting and lowering of the central crop lifter during headland turn manoeuvres.

Swath formation: the benefit of double-curved arms

The homogeneous quality and volume of the swath are conditions for fast drying and easy pick-up by the following baler.
The tine arms on GA rakes are in hyper-tangential position. This means that they reach a 90 degree angle very late. With the tines' sharp-angled cam, tine clearance is quick, later and requires little rotational effort to produce regular, fluffy and straight swaths. Raking is of high quality even at high speeds because the forage is not pushed past the swath.
The advantages of double-curved arms:

They reduce the distance between tine passes. Forage loss is reduced to a minimum, even at high speeds.
The main weight is at the centre of the tine arm. This increases service life as it is not subject to pressure during rotation and the guide rollers are less subject to stress.

A well formed swath thanks to double-curved tine arms

Passing over swaths without damaging them

To pass over swaths without damaging them, GA 8731+ and GA 9531+ rakes feature a suitably high headland turn position. In addition, the rotors can be tilted individually up to 40 degrees with more than 75 cm of clearance possible if required.
So there's no need to worry about formed swaths when you pass over them.

Protecting plant stubble

Perfect rotor adaption to variations in the field is just as important as reduced ground pressure when it comes to protecting the ground and plant stubble.
Single rotor rakes are fully equipped to meet these requirements.
Each rotor is equipped with four wheels in tandem positioned extremely close to the rotor for optimised contour following on uneven plots.

Easy to use and adjust

GA 7631, GA 8731 and GA 8131 CL: customize to suit your needs

Customize your machine with many optional equipment adapted to your farm:
Benefit from individual left and right rotor lift
Benefit from individual hydraulic setting of the rotor height
Choose the KGA 01S electronic control box to monitor the previous options
Reduce soil compaction with the large wheels.
Selecting the tandem axle with six wheels closest to the tines on the rear rotor will ensure optimum ground following.

GA 8731+ et GA 9531+: customizable with several options

The KGA 04C facilitates manoeuvres. You can easily place the rake in work/transport position, set the raking height hydraulically and raise the rotors individually.

Safety when travelling and compactness for transport

In transport position, the exclusive STABILIFT system of the GA 8731+ and GA 9531+ locks the rotors hydraulically. The machine is considerably more stable on bumpy roads and when passing over windrows. The transport height of the GA 7631, GA 8131 and GA 8131 CL, and GA 8731+ is less than 4.00 m, without having to remove tine arms. Concerning the GA 9531+, only 3 tine arms need to be removed per rotor. Three tine arms can also be removed on the GA 7631, GA 8131, and GA 8131 CL tools to reduce machine height further for storage.

STABILIFT: mechanical and hydraulic rotor locking for transport

Specifications

Technical characteristics


Working width (m)
Average windrow width (m)
Transport width (m)
Transport length (m)
Transport height with tine arms disconnected / connected
Windrow type
Number of rotors / Rotor diameter (m)
Number of tine arms per rotor / Number of tines per tine arm
Tine arms
Gearbox
Ground following
Number of wheels per rotor
Raking height adjustment
Spare wheel for rotors
Tyres on each rotor
Wheels on main chassis
Directional undercarriage wheels
Operation and function control
Drive to rotors
PTO speed (min^-1)
Hitch
Theoretical tractor power requirement (kW/hp)
Required tractor hydraulic connections
Required tractor electrical connections
Road lights and signalling
Approx. weight (kg)
Basic machine delivered assembled (except optional equipment)
Pick-up working width (m)
Pick-up height adjustment
Pick-up drive

GA 7631	GA 8131	GA 8731+	GA 9531+	GA 8131 CL
6.70 - 7.50	7.10 - 8.00	7.70 - 8.60	8.40 - 9.30	7.10 - 8.00
1.30 - 2.20	1.30 - 2.20	1.40 - 2.30	1.40 - 2.30	1.30 - 2.20
2.80 (3.00 with large wheels 380/55-17)	2.80 (3.00 with large wheels 380/55-17)	2.99	2.99	2.80 (3.00 with large wheels 380/55-17)
5.90	5.90	6.57	6.57	6.70
3.35 / 3.95	3.40 / 3.99	- / 3.99	3.82 / 4.40	3.40 / 3.99
1 central windrow	1 central windrow	1 central windrow	1 central windrow	1 central windrow
2 / 3.20	2 / 3.40	2 / 3.65	2 / 4.00	2 / 3.40
11 / 4	12 / 4	13 / 4	15 / 4	12 / 4
3 removable per rotor	3 removable per rotor	Fixed	3 removable on each rotor	3 removable per rotor
Fully enclosed double reduction MASTER DRIVE GIII	Fully enclosed double reduction MASTER DRIVE GIII	Fully enclosed double reduction MASTER DRIVE GIII	Fully enclosed double reduction MASTER DRIVE GIII	Fully enclosed double reduction MASTER DRIVE GIII
3D axle	3D axle	3D axle	3D axle	3D axle
4 rigid wheels (6 as optional equipment)	4 rigid wheels (6 as optional equipment)	4	6 (tandem included)	4 rigid wheels (6 as optional equipment)
Manual by crank handle (hydraulic as option)	Manual by crank handle (hydraulic as option)	By crank handle (hydraulic as option)	By crank handle (hydraulic as option)	Manual by crank handle (hydraulic as option)
		As standard	As standard
16 x 6.50-8	16 x 6.50-8	16 x 6.50-8	16 x 6.50-8	16 x 6.50-8
		15 / 55 -17	15 / 55 -17
As standard	As standard	As standard	As standard	As standard
		KGA 04C control box for setting into work/transport position, hydraulic raking height adjustment (with equipment 1148410) and individual rotor lift (with equipment 1148400)	KGA 04C control box for setting into work/transport position, hydraulic raking height adjustment (with equipment 1148410) and individual rotor lift (with equipment 1148400)
Mechanical with integrated free wheel	Mechanical with integrated free wheel	Mechanical with integrated free wheel	Mechanical with integrated free wheel	Mechanical with integrated free wheel
540	540			540
2-point - Cat. 2 and 3N pivoting links	2-point - Cat. 2 and 3N pivoting links	2-point - Cat. 2 and 3N pivoting links	2-point - Cat. 2 and 3N pivoting links	2-point - Cat. 2 and 3N pivoting links
40 / 54	45 / 60	50 / 68	55 / 75	45 / 60
1 SA + 1 DA	1 SA + 1 DA	1 SA +1 DA (+ 1 DA if hydraulic raking height adjustment)	1 SA +1 DA (+ 1 DA if hydraulic raking height adjustment)	1 x SA + 1 DA + 1 x SA with separate free return (40 l/min at 150 bar)
1 7-pin socket (1 3-pin socket if KGA01S control box)	1 7-pin socket (1 3-pin socket if KGA01S control box)	1 x 7-pin and 1 x 3-pin ISO sockets	1 x 7-pin and 1 x 3-pin ISO sockets	1 7-pin socket (1 3-pin socket if KGA01S control box)
As standard	As standard			As standard
1820	1925	2250	2400	2165
		Yes - except optional equipment	Yes - except optional equipment
				1.80
				By gauge wheels adjusted by shims
				Hydraulic drive via the tractor valve, speed adjustable by flow limiter