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GA 4121 GM and GA 4321 GM single rotor rakes have MASTER DRIVE gearboxes, which are extremely reliable during intensive operations. The working widths of these machines are 4.10 m and 4.20 m respectively.
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The rotor drive system is under a lot of strain during intensive raking operations. That’s why KUHN developed a totally enclosed gearbox with the mechanical parts protected to reduce wear.
The MASTER DRIVE gearbox is renowned for its dependable design and exceptional longevity, even when used intensively.
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.
The tines rake the crop gently, even when it is heavy and dense. They are made of heat treated steel so their service life is optimised and resistance to fatigue is increased. The “floating” tine attachment, featuring three large-diameter coils, also reduces the risk of wear. Tine height is tightly controlled to preserve both the stubble and the crop.
The homogeneous quality and the volume of swaths are necessairy for faster drying and easy pick-up by balers.
The tine arms on GA rakes are in a hyper-tangential position. This means that they reach a 90° 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 fast speeds because the forage is not pushed past the swath.
The advantages of double-curved arms:
The swath curtain mounted on the frame, is easily adjusted by a handle. It can also be set from the tractor cab via an optional hydraulic cylinder. When extended outwards, the screen automatically moves to the rear, when retracted inwards, it moves to the front. This is very practical as it is always correctly placed in relation to the crop flow.
The wheels are positioned extremely close to the rotor for improved ground contour following and to prevent the introduction of impurities in the forage.
GA 4121 and GA 4321 models are available with a pivoting headstock, which makes them as effective as a trailed machine.
At nearly 50 °, this coupling head offers the widest swivel angle on the market. Working on bends does not alter the raking quality or the shape of swaths so the baler has an easier job around corners
To optimise ground speed, raking quality, preserve ground cover and protect the machine against wear and tear from uneven terrain, GA 4121 and GA 4321 models have another important feature: The bogie axle with four staggered wheels adapts to ground contours and keeps the machine stable during higher working speeds.
These single rotor models are equipped with one or more headstock dampeners to improve stability on slopes (standard on GA 4321 models, optional on GA 4121).
When lifting the rotor, the dampener automatically and smoothly centres the headstock behind the tractor
| Models | GA 4121 GM | GA 4321 GM |
|---|---|---|
| Working width (m/ft) | 4.10/13'5" (right windrow) | 4.20/13'9" (right windrow) |
| Average windrow width (m/ft) | Approx 1.30/4'3" | Approx 1.40/4'7" according to setting |
| Raking deflector | Windrow curtain | Windrow curtain |
| Width (m) - tine arms removed/ in place | 1.75/5'7" | 1.95/6'4" |
| Unfolding and folding of guards | Manual | Manual |
| Windrow curtain opening adjustment | Manual | Manual as standard - hydraulic as an option |
| Number of rotors / Rotor diameter (m/ft) | 1/3.20 - 10'5" | 1/3.40 - 11'1" |
| Number of tine arms per rotor / Number of tines per arm | 10/4 | 12/4 |
| Tine arms | Removable | Removable |
| Gearbox | Enclosed-Double Stage-MASTER DRIVE | Enclosed-Double Stage-MASTER DRIVE |
| Bogie axle | - | - |
| Wheels | Fixed | Fixed |
| Height adjustment | By scale | By scale |
| Tyres under rotor | 16x6.50 - 8 | 16x6.50 - 8 |
| Primary PTO shaft | - | - |
| Linkage | 3-point-Cat. 1 and 2 | 3-point - Cat 2 |
| Headstock | Pivoting | Pivoting |
| Headstock suspension | - | 1 as standard - 2 as option |
| Min. PTO power requirement approx. (kW) | 22 | 22 |
| Min. PTO power requirement approx. (hp) | 30 | 30 |
| Necessary tractor hydraulic equipment | - | - |
| Lighting and signaling | - | - |
| Approx. weight (kg/lbs) | 540/1190 | 702/1547 |
