Optimer® L High-Speed Compact Disc

Optimer L_Sil.png

Optimize Your Spring Tillage

The Optimer® L high-speed compact disc, with independent 20" disc blades, is the ideal machine for quality shallow soil cultivation promoting decomposition of organic matter while preventing soil moisture loss. Working widths: 9’ 10” – 24’ 7” (3.0 m – 7.5 m). Mounted and trailed models.

Contact your dealer for pricing

Find a dealer near you

The KUHN Optimer® L is a high-speed compact disc available in mounted and trailed versions to meet the needs of a wide variety of customers. As a “small-disc” machine with 20” (510 mm) diameter blades, the Optimer L is best suited for high speed, shallow working depths, and lighter residue loads. Each disc blade uses its own suspension arm and elastomer mounting blocks to clear obstacles without upsetting the rest of the blades. Standard hydraulic working depth adjustment keeps the operator in the comfort of the tractor seat, reducing fatigue and downtime. Several standard features and options including side deflectors, following harrows, and rear roller options help your operation configure the machine to meet your individual needs.​

Your benefits

Built Smart


Main Frame

Both the mounted and trailed versions of the Optimer L are built on a strong frame with generous clearance underneath that allows soil and residue to pass through unhindered. Mounted versions use a rigid frame integrated with the headstock. Trailed versions have a large “backbone” that forms the main structure between the hitch and transport carriage. The discs and roller then mount to folding wing subframes that in turn mount to the main structure.

Disc Blades

All Optimer L models come standard with 20” (510 mm) diameter, notched disc blades. These blades are nearly ¼” (6 mm) thick for greater durability and a longer wear life. As seen in the center picture, each blade mounts to its own arm at a compound angle (6° from vertical and 15° from horizontal) to create a high-quality cutting and mixing action. The individual suspension arms mean that only individual discs are affected in the event of an obstacle strike, rather than an entire gang. The suspension arms bolt to sealed bearings that are lubed-for-life with high-quality synthetic grease. This greatly reduces time spent maintaining the machine.

Disc Blade Suspension

The suspension arm for each disc blade mounts to the frame with four polyurethane elastomer blocks. These blocks firmly hold the arms in place, yet have some “give” that allows the arm and disc blade to flex up and out of the way when an obstacle is struck in the field. Just like the suspension arms, the blocks are independent for each disc blade.

Side Deflectors

The side deflector discs catch soil and residue thrown from the disc blades and deflect it downward into the path of the roller, reducing the formation of ridges and promoting an even, level field finish. Each deflector adjusts in three directions: length, depth, and distance from the center of the machine, allowing the operator to fine-tune the field finish depending on conditions. ​

Adjustable Working Depth


Hydraulic Depth Control

Hydraulic depth control is a standard feature on all Optimer L models. Connected to a tractor SCV, the cylinders raise or lower the rear roller to obtain the desired working depth. Hydraulic control allows the operator to remain in the comfort of the cab and make quick adjustments as needed.

Steady Control

Steady Control is a ground-following option for the Optimer L 6000 and 7500 models. This KUHN exclusive controls the hydraulic pressure on each section using the tractor’s hydraulic compensation. If the ground contours force a section to go up, the rising pressure returns some hydraulic oil to the tank, while a decrease in pressure would bring more oil into the circuit to compensate for low-lying areas. In this way, a constant pressure and uniform working depth are maintained. Uniform depth provides agronomic advantages, since all seeds will be placed in a similar environment to promote consistent emergence. ​

Roller Options


T-Liner Roller

All Optimer L 100 Series (mounted) models come standard with the T-Liner roller. The T-Liner measures 23.6” (600 mm) in diameter and works best in medium to heavy soils. The scrapers help to keep the roller clean in sticky conditions, while the solid tube design reduces the chance that rocks become jammed in the roller. ​

Single Tube Roller

The Single Tube roller is an available option on the Optimer L 100 Series models. This roller features round bars arranged in a spiral pattern around the central axis, with an overall outside diameter of 21.7” (550 mm). It is lightweight for easy tractor lifting and performs best when crumbling and finishing light to medium soils. The Single Tube is less favorable if you work in sticky and/or rocky soils, as there is a greater potential for the roller to clog or stones to jam between the bars. ​

Flexliner Roller

The Flexliner roller is offered as an option on the Optimer L 100 Series models. Steel strips are attached to the central bar and can flex and spring as they roll along the soil surface. With a 21” (540 mm) overall diameter, this design works well in spring seedbed preparation applications. ​

Double Tube/Bar Roller

The Double Tube/Bar roller is offered as an option all Optimer L 100 (mounted) and 1000 Series (trailed) models. The front (tube) roller consists of round bars arranged in a spiral pattern around the central axis with a diameter of 21.7” (550 mm), while the rear (bar) roller consists of flat bars arranged in a spiral pattern with a diameter of 16.5” (420 mm). This roller offers excellent stability as well as crumbling and leveling medium to heavy soils.  ​

Double U Roller

The Double U roller is offered on the Optimer L 1000 Series models and is perhaps the most versatile roller in the lineup. It features two rows of wheels mounted in a staggered pattern, all of which measure 23.6” (600 mm) in diameter. This design helps the soil to flow through the roller and also helps the roller to self-clean. The Double U roller works with all soil types, including heavy and sticky soils, and offers good leveling ability. ​



Minimum PTO power requirement
Maximum PTO power allowed
Working width
Transport width
Notched disc diameter
Number of discs
Working depth
Side deflectors
Hitch type
Machine weight approx.
Road lights and signaling
90 hp (66 kW) 105 hp (77 kW) 120 hp (88kW) 120 hp (84 kW) 150 hp (112 kW) 180 hp (133 kW) 225 hp (166 kW)
150 hp (110 kW) 175 hp (129 kW) 200 hp (147 kW) 240 hp (178 kW) 250 hp (188 kW) 300 hp (224 kW) 360 hp (265 kW)
9'10" (3.0 m) 11'6" (3.5 m) 13'1" (4.0 m) 13'1" (4.0 m) 16'5" (5.0 m) 19'8" (6.0 m) 24'7" (7.5 m)
9'10" (3.0 m) 11'6" (3.5 m) 13'1" (4.0 m) 8'8" (2.6 m) 8'8" (2.6 m) 9'10" (3.0 m) 9'10" (3.0 m)
20" (510 mm) 20" (510 mm) 20" (510 mm) 20" (510 mm) 20" (510 mm) 20" (510 mm) 20" (510 mm)
24 28 32 32 40 48 60
1.2" - 4" (3 - 10 cm) 1.2" - 4" (3 - 10 cm) 1.2" - 4" (3 - 10 cm) 1.2" - 4" (3 - 10 cm) 1.2" - 4" (3 - 10 cm) 1.2" - 4" (3 - 10 cm) 1.2" - 4" (3 - 10 cm)
Left and right as standard Left and right as standard Left and right as standard Left and right as standard Left and right as standard Left and right as standard Left and right as standard
Cat. 2, 3N, 3 Cat. 2, 3N, 3 Cat. 3N, 3 Cat. 3 Cat. 3 Cat. 3/4N/4 Cat. 3/4N/4
3,946 lbs (1,790 kg) 4,586 lbs (2,080 kg) 5,181 lbs (2,350 kg) 9,700 lbs (4,400 kg) 10,880 lbs (4,935 kg) 12,346 lbs (5,600 kg) 13,700 lbs (6,200 kg)
Standard Standard Standard Standard