The heavy stubble harrow U 671 is ideal for stubble cultivation, effectively replacing ploughing. During stubble cultivation, the heavy frame ensures proper weighting of each disc. With the optimal disc shape and angle of attack, one pass with the machine is sufficient to cultivate the soil appropriately. The robust U 671 harrow, featuring a large gap between the discs, performs well in conditions where the soil dries quickly and becomes extremely hard, rendering classic tools ineffective. The machine is available in two versions: standard and PRO, with the primary difference being the location of the transport trolley behind or in front of the tillage roller.
Disc harrow designed for specialized tasks
Effective cultivation result
This disc harrow provides a single-pass effect of undercutting and mixing crop residues that competitors cannot achieve even after performing the operation twice. Challenging tasks on stubble after corn harvested for grain and fallow cultivation are executed with unprecedented precision and effectiveness. The U 671 disc harrow is designed for fast and efficient soil preparation, even at minimal working depths. Its design ensures easy soil penetration through the proper distribution of mass. Experience indicates that greater clearance under the frame offers enhanced capabilities, particularly with substantial plant residues. This proposal caters to demanding customers, guaranteeing extended usage without the need for frequent replacement of consumable parts.
Oversized key components
The heavy stubble harrow is a high-quality design tested in the most challenging soil conditions. The machine frame, working elements, transport system, and hydraulic system have proven their reliability during extensive cultivation tests. The greatest pressure on the cultivated soil per working element allows the machine to penetrate the ground easily, even in very tough conditions. The U 671 disc harrow can successfully compete with the most expensive machines of premium brands, surpassing competitors' products in most factors.
Machine construction
1. Rear LED lighting beam
Optionally, the LED lighting beam can be equipped with a license plate frame with illumination for machines that will be registered at the transport office.
2. Drawbar hitch
Due to the incorporation of washers and bushings crafted from highly durable materials, the drawbar eliminates the need for lubrication. It features replaceable hardened hitch tips. Optional coupling forms include a drawbar eye or a K80 ball hitch.
3. Massive drawbar
Drawbar with swinging beam of tractor hitch Category III, optionally Category IV. The design of the drawbar, mounted high on the machine, facilitates easier entry of the harrow into the cultivated soil. The robust, oversized drawbar ensures excellent stability during both cultivation work and transportation to the field.
4. Transport carriage
The transport trolley positioned in front of the tillage roller optimizes weight distribution on the machine, enabling efficient and smooth field operation and ensuring enhanced stability of the disc harrow during road transport.
5. Two brake options
Agricultural machines and their combinations exceeding a total weight of 3500 kg must be equipped with pneumatic or hydraulic brakes for movement on public roads. Machines surpassing this weight that are not equipped with such brakes are prohibited from traveling on public roads.
6. Supporting wheels
For large machines, the manufacturer recommends equipping them with optional support wheels to better maintain the working depth and relieve the load on the tractor's hydraulic lift system.
7. Working elements
The OFAS discs, with a diameter of 620 mm and a thickness of 6 mm, are manufactured using a specialized heat treatment method to ensure maximum strength and durability. The large size of the discs significantly reduces the cost of servicing the machine by using more material.
8. Bearing of working discs
The hubs are designed for 620 mm or larger discs, offering a 100% maintenance-free, durable solution for heavy machines. Users of Rolmako disc harrows can rely on the durability of the bearing units. Top-class 7-lip seals, combined with a double-row bearing, constitute one of the strongest solutions available on the market.
9. Long Life rubber shock absorbers
Rubber spring elements allow for precise adjustment of the recessed discs to the contours of the cultivated soil. The 50 mm x 210 mm rubber rollers absorb sudden impacts due to their extensive cushioning path. This ensures the safety of the disc harrow arm and provides absolutely maintenance-free overload protection while maintaining the specified working depth.
10. Leveling disc with shock absorber
The side screen, shaped like a bearing disc, ensures soil retention within the crop width, preventing soil displacement onto previously cultivated field sections. This feature is crucial for pre-sowing crops.
11. Spring comb beam
The 13 mm thick finger comb is mounted between the discs and/or in front of the tillage roller. This option ensures unobstructed operation when processing a large volume of soil.
12. Tillage roller
To cultivate the soil effectively, selecting the appropriate tillage roller is essential. The choice depends on the soil type and the desired outcome. Each roller variant is designed for specific working conditions.
13. Adjusting the working depth
The hydraulic adjustment of working depth, facilitated by spacer clips on the cylinders, is designed to be easy and operator-friendly.
14. Automatic arm lock
The transport lock is automatically engaged by a spring-loaded latch, which is released by a single-acting hydraulic cylinder.
15. Adjustment of the row of disc
The heavy stubble harrow is equipped with a rear beam adjustment system. This feature enables the rear discs to be adjusted relative to the front ones, ensuring optimal configuration of the working section at each stage of disc wear.
Equipment
standard
- OFAS discs 620 mm x 6 mm, rubber shock absorber LongLife Ø 50 mm x 210 mm, maintenance-free bearings FKL, spacing between rows of discs 105 cm, pipe roller Ø 500 mm. Standard version equipped with 520/50-17 wheels and pneumatic brake (trailer section placed behind rear roller). Manufacturer recommends the machines with a working width of 6.0 m and 5.0 m to be ordered with a fourth category of the tractor hitch. In the U 671 PRO machine, the transport trolley is positioned in front of the tillage roller. This variant features hydraulic adjustment of the working depth.
Equipment
optional
- Finger comb beam
- Plough beam PRO+
- Hydraulic brake
- Hydraulic adjustment of working depth
- Hydraulic folding of the discs to the transport position
- Hydraulic adjustment of the rear discs beam
- Hydraulic rear transporting wheel 400 / 60-15.5
- 400/60-15.5 supporting wheels for trailed version
- Levelling discs with shock absorber
- Front reflective plates (mounted machines)
- Front LED lighting beam (trailed machines)
- Rear LED lighting beam
- Backlit license plate frame with lighting
- Maintenance-free roller bearing units
Tillage rollers
optional
- Pipe roller Ø600mm
- Packer cogged roller Ø 550/650 mm
- Crosskill roller Ø 500 mm
- Ring roller Ø 500/600 mm
- Spring roller Ø 550 mm
- Rubber roller Ø 500/700 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
- Prismatic roller ORION Ø 500 mm
- Tandem pipe roller Ø 400 mm plus string roller Ø 400 mm*
- Tandem pipe roller Ø 400 mm*
- Tandem U-ring roller Ø 540 mm*
*) tandem rollers available only in version U 671 PRO.
Most frequently chosen accessories
Cultivation tools
Discs 620 mm x 6 mm
The combination of the shape of the disc and the optimal angle of the disc arm has made it possible to achieve full-surface cultivation from a working depth of just 7 cm. Discs with a large diameter and thickness provide several times more material for wear compared to smaller working elements. This maximizes the machine's operating time and reduces servicing costs. The quality of the steel and the experience gained from many years of production by the Italian company OFAS guarantees a high-quality product that has already been approved worldwide.
Disc attack angle
The significant distance between the disc working elements and the substantial clearance under the machine frame are essential features that, combined with the aggressive angle of attack of the working elements, facilitate effective performance on corn stubble and other challenging crops. The optional PRO+ beam is the result of designers' efforts to achieve an enhanced full-surface undercut by operating the disc harrow as shallowly as possible. The optimal geometry of the discs ensures high-quality work with excellent efficiency and a significant proportion of mixed plant residues. Even with partial disc wear, the ideal working angle is maintained.
See more https://www.rolmako.com/armspro+.pdf
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://en.apv.at). 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
Disc hub
The maintenance-free hub features a robust large angular contact ball bearing mounted on a hardened axle, capable of carrying very heavy loads. The bearing requires no maintenance (no lubrication points), is perfectly sealed, and protected against contamination. It is a fully integrated hub bearing system, sealed and filled with grease for the unit's entire service life. Additionally, the hub's service life is three times longer than that of a traditional bearing. This extension improves machine service life, reduces failures, and saves both time and money.
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 heavy stubble harrow U 671 features rear beam adjustment. This system allows the rear discs to be moved relative to the front ones, optimizing the working section at each stage of disc wear. This important parameter allows for optimal cultivation in changing conditions. The standard mechanical adjustment of this parameter is quick; simply unlock the shift by unscrewing the screw, sink the harrow into the ground, and slowly move the tractor forward or backward, finally securing it with a screw. An optional hydraulic variant of shifting the rear beam with discs for rigid machines is also available.
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.
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.
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 671 PRO disc harrows is designed to work with high-power tractors, delivering optimal performance at high working speeds.
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 offering a competitive 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.
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