The U 652 disc harrow is a stubble harrow that performs post-harvest work efficiently. Equipped with high-quality discs and shock absorbers that meet stringent operating standards, the machine's wide gap between the discs and vibration-absorbing shock absorbers ensures optimal processing of crop residues without blockages. It excels not only in stubble work but also in soil preparation before sowing.
A universal machine for pre-sowing and stubble cultivation
Two variants of the overload shock absorber
The U 652 machine is an addition to Rolmako's extensive range of disc harrows, positioned between the U 693 and U 671 models. Featuring a disc spacing of 90 cm, it is equipped with OFAS 560 mm discs, maintenance-free hubs, automatic transport locking, and hydraulic depth adjustment. The machine's working elements are protected against excessive overload by LongLife 40 mm rubber elements or, optionally, 3D shock absorbers with a 35 mm x 35 mm worm spring.
Additional cultivation tools that ensure the highest quality of cultivation
Rolmako U 652 can be equipped with tools for fast and high-quality cultivation. The machine can include a finger comb beam between the discs to prevent stubble blockages and a rear spring comb beam to spread poorly dispersed straw over the entire crop width. It can also be equipped with front cultivation tools, a choice of Crossboard drag in various versions, or a knife roller, depending on the desired cultivation effect.
Machine construction
1. Rear LED lighting beam
2. Drawbar hitch
3. Massive drawbar
4. Transport trolley
5. Two brake options
6. Supporting wheels
7. Knife roller
8. Working elements
9. Bearing of working discs
10. Long Life rubber shock absorbers
11. Side leveling covers
12. Tillage roller
13. Adjusting the working depth
14. Automatic arm lock
15. Adjustment of the row of disc
- OFAS toothed disc with a diameter of 560 mm, rubber shock absorber LongLife 40mm x 180mm, maintenance-free AgriHub hubs, spacing between the rows of discs 90 cm, hydraulic adjustment of the working depth, pipe roller Ø 500 mm. The U 652 disc harrow with a width of 5.0 m and 6.0 m is equipped witha pneumatic brake as standard. On the Customer's request, a smooth disc or a fine toothed disc is mounted.
- Maintenance-free SKF hub
- Spring comb beam
- Finger comb beam
- 3D absorber with 35 mm x 35 mm spring
- ALFA disc 560 mm x 5 mm
- Front Crossboard heavy duty drag
- Disc 610 mm x 6 mm + reinforced disc leg
- ProCut knife roller (hydraulic adjustment)
- Pneumatic brake
(4,0 m HP i 4,5 m HP) - Hydraulic brake
(4,0 m HP i 4,5 m HP) - Supporting wheels 400/60-15.5 for the trailed version
- Levelling side covers
- Delimbe aftercrop seeder
- APV aftercrop seeder
- Front reflective plates (mounted machines)
- Front LED lighting beam
(trailed machines) - Rear LED lighting beam
- Maintenance-free roller bearing units
- String roller with flat bars Ø 460 mm
- String roller with cogged bars Ø 460 mm
- Packer cogged roller Ø 460/550 mm
- Tubular-ring roller Ø 450 mm
- Crosskill roller Ø 400/500 mm
- Ring roller Ø 500/600 mm
- Spring roller Ø 470/550 mm
- Rubber roller Ø 500 mm
- Tire roller Ø 600 mm
- Roller of steel rings 48-52HRC Ø 600 mm
- T-ring roller Ø 500/600 mm
- U-ring roller Ø 540 mm
- Tandem pipe roller Ø 400 mm plus string roller Ø 400 mm
- Tandem U-ring roller Ø 540 mm
- Prismatic roller ORION Ø 500 mm
Most frequently chosen accessories
Cultivation tools
Modern construction
The three-part frame of the machine facilitates better weight distribution, with the wings of the disc harrow being lighter. This design allows for the repositioning of the middle roller, enabling the rollers to overlap. Unlike rollers mounted in a single line, this configuration completely eliminates the potential for blockages. Placing the axle in front of the tillage rollers offers several advantages, including the ability to mount the rollers in a tandem system and improving the machine's performance on roads and in the field. The entire series of Rolmako U 652 disc harrows is designed to work with high-power tractors, delivering optimal performance at high working speeds.
Crossboard drag
The drag is constructed from hardened springs and bent working tips. Positioned ahead of the disc section, it breaks up clods and levels the field, creating an optimal surface for sowing. The harrow is effective on stony fields as it does not bring stones to the surface. For challenging conditions, an optional stabilizing beam can be mounted to connect the working elements into a unified system for enhanced leveling. When a hard crust forms on the field surface, an aggressive skid with DoubleKnife tines is recommended.
Finger comb beam
The tool, placed between the rows of two disc sections, has adjustable working height and angle of inclination. It controls the flow of soil with mixed organic residues and improves the distribution of stubble residues over the entire field surface. The finger weeder operates without direct contact with the soil, retaining the soil, and allowing the rear disc section to work freely without issues dealing with a large amount of soil. The weeder can additionally be mounted between the rear disc beam and the finishing roller, thus regulating the flow of the cultivated mass onto the finishing roller.
Spring comb beam
The manufacturer optionally installs a beam with a spring comb behind the disc section, ensuring the straw is evenly spread across the field's surface, thereby preventing areas of high straw accumulation that hinder proper cultivation. Uniform straw distribution is crucial, as it ensures consistent development conditions for the next crop across the entire field. The spring comb is an effective tool that enhances cultivation, offering optimal starting conditions for sown plants.
APV aftercrop seeder
We equip our cultivation machines with catch crop seeders in partnership with specialists from APV, who provide a wide range of catch crop and fertilizer seeders. The complete product range and available accessories can be found on the manufacturer's website (https://www.apv-polska.pl). Utilizing APV catch crop seeders on Rolmako cultivation machines reduces unnecessary travel. APV devices ensure precise spreading of catch crops and subsowing, even in the smallest doses.
Tillage rollers
Kneading, compacting the soil, crushing clods, and leveling the field surface are the final stages of cultivation, performed by the rear roller following the working tools of the cultivation machines. The selection of the appropriate cultivation roller significantly impacts the entire work process and the functionality of the cultivation machine. At Rolmako, we offer a variety of cultivation rollers that differ in shape, material, external diameter, weight, and, most importantly, cultivation purpose. The choice of roller depends on the soil type and the desired cultivation outcome. Rolmako provides expert advisory services to ensure proper adjustment of the cultivation machine to the working conditions.
The primary properties
3D absorber
Each disc is individually safeguarded against overload by a 3D shock absorber. The machine's new disc and frame protection system can move omnidirectionally to bypass obstacles. The overload system (vibrations during operation) ensures optimal penetration effect. The spring enhances cultivation through the vibration effect, ensures disc cleaning, and promotes consistent performance.
LongLife rubber shock absorber
Each disc is independently mounted to the frame using a 40 mm x 180 mm rubber shock absorber, ensuring consistent maintenance of the working depth, an aggressive cultivation effect, and protection against damage. Rubber spring elements allow optimal adjustment of the recessed discs to the soil contours. The rubber rollers prevent sudden impacts with their extended shock absorption path. This ensures the safety of the disc harrow frame and maintenance-free overload protection while maintaining the set depth.
Adjustment of the row of disc
The front disc beam has a shift adjustment, enabling modification of the disc position relative to the rear working section. Adjusting the disc row settings proves beneficial at later stages of operation, as it compensates for reduced disc diameter resulting from extensive use. This adjustment maintains optimal working parameters despite disc wear.
Hydraulic drawbar
The disc harrow, equipped with an optional hydraulic drawbar, offers an additional function allowing for quick and gentle turning in the field using the intended cultivation rollers without the need for the machine's road wheels. The hydraulic drawbar, featuring an eye for the lower tractor hitch, simplifies connection to the tractor, increases each disc's pressure, and provides excellent stability during cultivation work and travel to the field. The optional drawbar is available with a fi 50 eye or a K80 ball hitch from Scharmüller. The drawbar with a fi 50 eye facilitates close attachment next to and below the tractor's rear axle, ensuring a reliable pulling point and improved energy transfer.
Supporting wheels
Wide front support wheels deliver exceptional control over working depth, enhancing stabilization and offering additional support to relieve the three-point tractor suspension system. The large wheel diameter ensures smooth operation on uneven fields, guarantees precise performance with wide machinery, and positively impacts cultivation quality by stabilizing the machine during operation.
Transport carriage
Trailed disc harrows come with a hydraulic drive system that lifts during cultivation, adding extra weight to the harrow. Its placement in front of the tillage roller is crucial as it shifts the center of gravity toward the tractor, enhancing weight distribution. The disc harrow can operate at speeds up to 15 km/h, efficiently leveling the field. Road transport is safer since the machine's wheels bear most of the pressure, significantly reducing the load on the tractor's lift.
Maximum lifespan of disc bearings
The elimination of hub maintenance requirements minimizes maintenance needs and conserves time. Standard hubs can be substituted with SKF original maintenance-free hubs, offering three times the service life of other solutions. SKF quality ensures enhanced reliability, increased efficiency, and reduced operating costs. The service life of SKF hubs is substantially higher than that of conventional bearings, achieving this with relatively low ownership and operating costs. Composed of 100% bearing steel, the hub optimizes machine uptime and reduces agricultural machinery service costs.
Utilization of various disc variants
The optimized angle of attack is identical for both rows of discs, ensuring the machine follows the tractor precisely. The quality of the steel and the extensive experience gained through many years of production by the Italian company OFAS guarantee a top-quality product that has been approved worldwide. Discs with an aggressive tine are primarily used for working in fields with substantial straw. The disc tines facilitate easier machine penetration in challenging dry conditions. Smooth and fine-toothed discs are designed for shallower pre-sowing cultivation. The ALFA disc delivers excellent results on stubble after corn harvested for grain.
ALFA cutting disc
The profiled ALFA discs, with a significantly higher cutting and mixing effect compared to classic shapes of working elements, are a proven choice for farmers seeking optimal results. The profiled shape allows the disc to extract more soil and achieve better mixing and covering of plant residues. A large number of blades cut the stubble into small pieces, facilitating subsequent agrotechnical work. Recommended for all post-harvest crops, especially after harvesting corn for grain, the innovative ALFA disc 560 mm x 5 mm guarantees perfect cutting of crop residues.
Hydraulic adjustment of working depth
Hydraulic depth adjustment ensures optimum comfort of use and significantly facilitates activities related to setting this work parameter. The hydraulic adjustment of working depth, which is easy and operator-friendly, is conducted using spacer clips on cylinders. This option is justified when frequent changes in the working depth of the machine's elements are required.
Bearing units of the roller
By incorporating maintenance-free bearings into the tillage rollers, we minimize the required machine maintenance time. The ductile cast iron housing is four times more durable than its grey cast iron counterpart. The combination of top and internal sealing offers superior protection for agricultural use. Rolmako prioritizes the smallest machine elements in every project, significantly impacting maintenance time and reducing the costs and duration of agricultural equipment inspections.
Steel providing an advantage
Increasingly larger and more powerful agricultural tractors subject the structural elements of agricultural machinery to significant stress, pushing them to their operational limits. Modern agricultural structures are expected to demonstrate high resistance to loads and an extended service life. Achieving a high-quality end product necessitates the use of superior-quality steel in production. Accordingly, we utilize high-quality Swedish fine-grained steels S500MC and S700MC, as well as carbon and boron steels for heat treatment and the wear-resistant Hardox. The use of these high-quality steel products ensures our agricultural equipment is highly durable and capable of operating at high speeds with high surface efficiency.
Oversized agricultural structures
Rolmako tillage machines distinguish themselves from competitors due to their superior weight. The company's development team designs agricultural equipment to endure the most challenging working conditions. Rolmako machines efficiently cultivate land in demanding regions worldwide without requiring additional loads. The substantial amount of steel in their construction makes these tillage tools robust, enabling the utilization of high-power modern tractors and ensuring long-term farm investment.
Various configurations available
Extensive export experience has enabled us to craft an offer aligned with customer expectations. Numerous configurations and additional agricultural equipment options allow us to adapt the device to specific field conditions. Years of dedicated efforts by Rolmako employees in enhancing the company's products ensure we deliver the highest quality products to the most remote regions, where they have proven effective in diverse soil systems.