Stubble Disc Cultivators OPTIMER XL

OPTIMER XL till silhouette

Intensive mixing at high speed

The OPTIMER XL stubble cultivators with 620mm diameter discs are available from 3 to 12 metres wide. The OPTIMER XL range ensures an optimal penetration capacity for working from 5 to 15 cm deep in large quantities of residue.

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The OPTIMER XL range is available in mounted and trailed models from 3 to 12 metres wide. These independent disc cultivators provide a working capacity from 5 to 15 cm deep and optimal penetration thanks to its larger discs (620 mm diameter).
With an OPTIMER XL, you have all the advantages of stubble cultivation: shallow to deep stubble cultivation, burial of large quantities of residue (such as maize stalks), and destruction of green covercrops.
The OPTIMER XL range is adapted to tractors from 70 to 700 horsepower and offers a wide range of rollers to meet all requirements.
OPTIMER XL at work

Your benefits

Intensive mixing at high speed

OPTIMER XL 300 in stubble cultivation

Strong penetration ability

The OPTIMER XL stands out from the competition with better penetration in dry conditions. This is due to its unique design, which boasts:
  • a wide disc hanger which avoids lateral movement of the disc,
  • an elastomer safety device combining powerful penetration but also forgiving in the event of large shocks,
  • one disc per arm for better penetrations and flow of material through the machine.,
  • optimised attack angles of the disc (12° vertical - 14° horizontal).

Increased material flow

With one disc per arm, the OPTIMER XL provides a greater capacity for material flow.
In comparison with the OPTIMER+ range, the OPTIMER XL boast significantly greater clearances to ensure quality stubble cultivation in large quantities of residue:
  • clearance between disc gangs (front and rear) = 95 cm
  • clearance under the disc hanger = 70 cm
  • Frame clearance = 91 cm
Thanks to these high clearances, the risk of blockages is almost eliminated. The OPTIMER XL can easily work in high quantities of residues or bury manure.
Wide view of the OPTIMER XL 5000 in work

Intensive mixing

The impressive mixing quality of the OPTIMER XL lies in its 620mm diameter conical profile discs. The choice of the vertical angle ensures this mixing. The conical profile ensures that the same penetration angles are maintained regardless of disc wear. In order to maintain its cutting quality over time, the discs are 6 mm thick and thus maintain an aggressive profile.
Zoom on the work of the OPTIMER XL 300 discs

A range built around simplicity

Mechanical (left) and continuous hydraulic (right) depth adjustment

Simple and quick adjustments

The OPTIMER XL benefits from simplified settings, as KUHN offers on all its product ranges. Mechanical adjustments with shims are available as standard: quick and intuitive, they have been designed to make life easier for operators.
As an option, the working depth is infinitely adjustable hydraulically from the tractor cab. All the adjustments are made without tools and guarantee comfort of use.
In addition, on models from 3 to 5 metres, the driver can vary the working depth according to the type of soil, or in the presence of stones or wet areas.

Minimal maintenance

The OPTIMER XL retains one of the major advantages of the OPTIMER + range; low-level maintenance of the machine. In fact, the OPTIMER XL aims to avoid downtime during stubble cultivations.
The disc bearings are maintenance-free and lubricated for life.
The low maintenance gives considerable time saving.
View of the bearings of the OPTIMER XL independent discs

Quality wearing parts

The large 620 mm diameter discs have a thickness of 6 mm.
In fact, 6 mm of thickness give you 20% longer life compared to the 5 mm discs.
With less frequent replacement of discs and the quality of work preserved, the OPTIMER XL saves you time and money.
The large 620 mm diameter discs have a thickness of 6 mm to use the full potential of the wear of your stubble cultivator.

A cultivator adapted to all conditions

Zoom on the levelling harrow at the rear of the OPTIMER XL discs

Optional levelling harrows

The OPTIMER XL range has the advantage of being able to be equipped with different options in order to adapt to the soil conditions, the different fields or the type of cultivation desired.
  • the distribution of the residue over the entire width of the machine
  • the regulation of the soil flow to prevent roller blockage
  • levelling before the roller passes. For the roller to work efficiently, it is necessary to have a flat surface before the roller passes.
  • Additional weights of 460 kg are available on the OPTIMER XL 300, 350 and 400 models to increase the penetration of the discs in difficult terrain. By equipping your trailed OPTIMER XL with front gauge wheels, you will gain in stability and ground following quality thanks to the floating position of the drawbar. The working depth can be adjusted from the tractor cab and is adjusted with the gauge wheels in combination with the roller.

    Excellent ground following with the Steady Control innovation

    The "Steady Control" ground following device is a true KUHN exclusivity. Each section is independent in order to perfectly follow the unevenness of the terrain. The pressure on the extension cylinders is actively, hydraulically controlled to guarantee the penetration of the discs in all conditions.
    The OPTIMER XL 6000 and 7500 disc cultivators can be equipped with the optional Steady Control ground following system. It is fitted as standard on the 9 and 12-metre models for perfect control of the working depth whatever the soil conditions. Steady Control provides immediate response to soil conditions and reduces fuel consumption. The quality of work is regular and homogeneous over the entire field, even at high speeds. Contrary to the nitrogen accumulator system used by many other manufacturers, the Steady Control system uses oil flow between the tractor and the extension cylinders to eliminate pressure variations.
    The SH seeder makes it possible to combine seeding and stubble cultivations in one pass.

    A wide choice of rollers

    In order to achieve an optimal re-consolidation in the working area, KUHN offers a wide range of rollers on the OPTIMER XL:
    • Tube (dia. 550 mm): for a re-consolidation of 75 kg per metre. Ideal for light soils, it offers a good compromise between crumbling, levelling and surface compaction.
    • T-Ring (dia. 600 mm): for consolidation of 130 kg per metre, this roller guarantees a good crumbling in clay or cloddy soils and presses on the straw to promote its decomposition.
    • T-Liner (dia. 600 mm): for consolidation of 140 kg per metre. It is a very complete roller that can be adapted to different working conditions and objectives. It provides an exceptional crumbling quality in clay and/or cloddy soils, especially in the presence of stones.
    • V-Liner roller (dia. 600 mm): for a reconsolidation of 145 kg per metre, it offers a very good crumbling and levelling result and a high quality surface reconsolidation. Its V-profile limits runoff and improves water infiltration in the inter-row. It can work in both wet and dry conditions.
    • Double U roller (dia. 600 mm): for a reconsolidation of 175 kg per metre. Versatile, it provides good reconsolidation in light soils, does not clog up because it is self-cleaning and the soil-soil contact limits roller wear and avoids any smearing effect.
    The HD Liner 600 roller provides high quality reconsolidation even in wet conditions<br />Photo of the HD Liner 600 roller adapted to the OPTIMER XL

    Sowing cover crops

    The OPTIMER XL 4000, 5000, 6000 and 7500 trailed cultivator models are compatible with the SH 600 small seed drill. Equipped with a 600 litre hopper, this seed drill allows you to sow cover crops or cereals at the same time as your stubble cultivation.
    Its large capacity offers a high work rate and reduces your establishment costs. It is equipped with a great autonomy and can be loaded with a big bag.
    The QUANTRON S2 control box allows you to simply adjust the seeding rate, monitor the seed level and blower speeds. The VENTA volumetric metering unit offers excellent seeding precision from 1 to 430 kg/ha. It can be adjusted to apply all types of seed and fertiliser without tools.
    The OPTIMER XL 300, 350, 400, 4000 and 5000 models can also be equipped with the SH 201 and 402 seed drills.
    The SH seeder makes it possible to combine seeding and stubble cultivations in one pass.


    Wide view of the OPTIMER XL 5000 at work


    Technical characteristics

    Minimum allowable power (kW/hp)
    Maximum tractor power (kW/hp)
    Working width (m)
    Transport width (m)
    Notched disc diameter (mm)
    Number of discs
    Working depth (cm)
    Lateral deflectors
    Hitch attachment
    Weight approx (kg) with T-Ring roller
    Weight approx (kg) with Double U roller
    Approx. weight (kg) with HD-Liner 600 mm roller
    Following harrow
    Press rollers
    Roller depth adjustment
    Front depth wheel
    Transport wheel
    Lighting system
    77/105 90/122 103/140 119/160 149 / 200 179/240 224/300 268/360 358/480
    123/165 141/190 164/220 178/240 223 / 300 268/360 355/450 403/540 522/700
    3 3,5 4 4 5 6 7.2 9 12
    3 3,5 4 <2,55 <2,55 3 3 3 3
    620 (thickness 6mm) 620 (thickness 6mm) 620 (thickness 6mm) 620 620 620/6 620/6 620 620
    24 28 32 32 40 48 58 72 96
    From 5 to 15 From 5 to 15 From 5 to 15 From 5 to 15 From 5 to 15 From 5 to 15 From 5 to 15 From 5 to 15
    Left and right standard Left and right standard Left and right standard Right and left as standard Right and left as standard Right and left as standard with disc coulter Right and left as standard with disc coulter
    2, 3N, 3 2, 3N, 3 3N, 3 Cross shaft std 3 Cross shaft std 3 Cross shaft 3/4/4N Cross shaft 3/4/4N
    5150 (with Double U roller) 5600 (with Double U roller)
    6 000 6 800 10 300 13 700
    2 248 2 596 2 888
    In option In option In option
    Standard Standard Standard
    Mechanical working depth assistance Mechanical working depth assistance Mechanical working depth assistance Hydraulic in continous Hydraulic in continous Hydraulic assistance as standard Hydraulic assistance as standard
    400/60x15.5 400/60x15.5
    520/50x17 520/50x17 550/45x22.5 550/45x22.5 560/60R22.5 560/60R22.5
    Fitted as standard Fitted as standard Fitted as standard Fitted as standard Fitted as standard Fitted as standard