The MR 520 roadheader is a robust machine designed for operation in underground mines, particularly in deposits of salt, potash, and gypsum. Thanks to its design and high power output, it performs effectively in the excavation of large cross-section workings in medium-strength rock. Worldwide, it is used in demanding geological conditions as a reliable tool in modern extractive industries.
See technical specifications
Operational capabilities of the MR 520 roadheader
The MR 520 is a heavy-duty roadheader designed for operation in demanding underground environments. Its modular design facilitates transport and assembly in confined spaces, which is of great importance in the day-to-day operation of a mine. The machine is designed for cutting rock with compressive strength of up to 50 MPa — such as salt, gypsum, and potash. A modern load-sensing hydraulic system allows precise adjustment of operating parameters to the load, resulting in improved energy efficiency and extended component service life.
Where is the MR 520 roadheader used?
The MR 520 roadheader is primarily used in underground mines where machines capable of excavating large cross-section workings in medium-strength rock are required. It is particularly well suited for the extraction of salt, potash, and gypsum. Thanks to its robust design, the machine is widely used in mining operations around the world. It is a proven roadheader suitable for access, preparatory, and development works.
Our offer
We offer comprehensive repair and revamping services for machinery used in the mining industry, especially for roadheaders. We provide professional servicing, regeneration of components and innovative technical solutions under our special programme. Feel free to check out our offer
MR 520 roadheader – technical specification
Below you will find the detailed technical specification of the MR 520 roadheader.
| Parameter | Value |
|---|---|
| Overall length | 14.25 m |
| Overall height (above slewing ring / cabin) | 3440 mm |
| Overall width (loading table) | 5510 mm |
| Total weight | approx. 102 t |
| Unit ground pressure | 0.2 MPa |
| Ground clearance | 280 mm |
| Supply voltage | 1000 V / 50 Hz |
| Total installed power | 547 kW |
| Cutting head motor power | 300 kW |
| Type of drive | electric |
| Maximum cutting height | 5.20 m |
| Maximum cutting width | 8.35 m |
| Undercut below crawler level | 285 mm |
| Cutting and material handling parameters | |
| Type of cutting head | Transverse, spiral |
| Cutting head equipment | Tangential-rotary cutting picks |
| Cutting speed | 3.4 / 4.2 m/s (at 50 Hz) |
| Travel speed | 0–6–13 m/min |
| Gradient capability | ±18° (without stabilization) |
| Minimum turning radius | 12.5 m |
| Maximum turning radius | 25 m |
| Type of loading system | Gathering arms + loading table |
| Type of material transport | Chain conveyor / scraper conveyor |
| Loading system capacity | up to 350 m³/h |
| Hydraulic system | Load-sensing (proportional) |
| Cutting head cooling | Dry cooling system |
| Modular design facilitating maintenance The MR 520 has been designed for easy transport, assembly, and technical servicing in mining conditions. The segmented structure of the machine allows quick underground assembly and provides convenient access to key components during maintenance operations. |
Capability to operate in variable conditions
The roadheader performs reliably in diverse terrain thanks to its crawler undercarriage and its ability to operate on gradients of up to ±18°. It is a machine that maintains stability and efficiency even in more challenging geological conditions. |
| High cutting performance
Thanks to the transverse cutting head with a power output of 300 kW, the roadheader effectively cuts rock with compressive strength of up to 50 MPa. A cutting speed of up to 4.2 m/s translates into high operational efficiency. |
Precise cutting with reduced energy consumption
The advanced load-sensing hydraulic system allows dynamic adjustment of operating parameters to current load conditions. The result? Smooth operation, lower energy consumption, and extended service life of key components. |
MR 520 tunnelling roadheader – price
Purchasing a new MR 520 roadheader is an investment that can place a significant burden on a mine’s budget—the cost of a new machine in this class is often very high. For this reason, companies much more frequently decide to acquire used units that have been comprehensively refurbished and upgraded.
At our company, we support clients precisely in this approach – we offer major overhauls, modernizations, and preparation of machines for operation under specific conditions. As a result, you gain equipment with high reliability and often better performance than factory-new roadheaders, but at a far more favorable cost.
Comprehensive support under the RESTART program
If you own an MR 520 roadheader and want to restore its full operational capability or adapt it to current working conditions, you can rely on our comprehensive support—covering major overhauls as well as modernization, rebuilding, and retrofitting of the machine.
As part of the Minostar RESTART program, we implement projects that enhance roadheaders—often enabling performance levels that exceed the machine’s original factory parameters. We introduce proprietary design solutions that are not available in the standard manufacturer’s specification. Be sure to explore our proprietary program by clicking the button below.
Design and Key Components of the MR-520 Roadheader
Cutting unit
The heart of the MR 520 is a transverse cutting head with a spiral design, developed for high performance in rock with compressive strength of up to 50 MPa. The cutting unit is driven by a 300 kW electric motor cooperating with a multi-stage gearbox. The use of tangential-rotary cutting picks enables efficient material breakage in demanding geological conditions. The cutting speed ranges from 3.4 to 4.2 m/s (at a frequency of 50 Hz).
Boom and slewing system of the MR 520
The cutting head is mounted on a boom equipped with a slewing mechanism, allowing precise cutting without the need to reposition the entire machine. As a result, the MR 520 can operate in workings with varying cross-sections, providing time savings and greater operational flexibility. The boom allows both vertical and horizontal deflection.
Material loading system
The detached material is transferred onto a wide loading table, from where gathering arms guide it onto the scraper chain conveyor. The entire system has been designed for efficient transport of excavated material to the mine haulage system. This solution minimizes the risk of blockages and enables smooth handling of large material volumes, even under conditions of intensive operation.
Undercarriage and travel drive
The machine moves on a crawler undercarriage, ensuring stability and reliability on unstable ground. The roadheader can operate on gradients of up to ±18°, enabling use in more challenging sections of workings. The maximum travel speed is 13 m/min, while the compact dimensions and low unit ground pressure support safe maneuvering.
Power supply, control, and hydraulics
The MR 520 is powered by a 1000 V / 50 Hz supply. The total installed power is 547 kW, ensuring efficient power delivery to all machine systems. A modern load-sensing hydraulic system, based on several independent circuits, enables precise control of cutting and travel functions. The cooling and lubrication systems have been designed with durability and reliability in mind. An explosion-proof FLP-certified version is also available.
Spare Parts and Service for the MR-520 Roadheader
The MR-520 roadheader is designed to operate in demanding underground conditions, which makes reliable, fully compatible components essential. At Minostar, we specialize in supplying high-quality spare parts for the MR-520 roadheader that are 100% compatible with the machine’s design and can directly replace components used in its original configuration. Each component is developed based on a detailed analysis of the machine’s structure, ensuring full dimensional and installation compatibility, while often delivering enhanced durability and improved operating performance compared to OEM solutions.
Our offer includes a wide range of components that ensure reliable operation of the MR-520 roadheader in all working conditions:
- hydraulic system components for the MR-520 (hydraulic pumps, control valves, cylinders),
- travel system components for the MR-520 roadheader (crawler tracks, gearboxes, rollers),
- cutting system components for the MR-520 (cutting heads, picks, pick holders),
- electrical system and control components,
- structural parts and supporting assemblies.
We also provide support in the field of upgrades, repairs and overhaul services for the MR-520 roadheader – from routine maintenance work to full machine refurbishment and adaptation to current operating conditions.
If your MR-520 roadheader requires restoration of full operational capability or you want to improve its reliability and service life, Minostar delivers solutions that directly translate into safety and continuity of underground operations.
Why us?
12 years of experience
Over a decade of activity, we have acquired knowledge and practical skills that allow us to successfully implement even the most complex projects.
An experienced team
Qualified engineers, mechanics and specialists with many years of experience in the mining industry who are constantly improving their competences.
Comprehensive offer
We offer a wide range of machines, parts and services. We provide support at every stage of the equipment life cycle.
Global reach
We deliver our solutions to customers from all corners of the world, gaining valuable experience in many demanding environments.
Comprehensive support for your roadheader
Do you own an MR 520 roadheader or another model and want to restore it to full working condition? Take advantage of our experience in refurbishment, modernization, and the sale of high-quality spare parts.
We provide comprehensive service—from repairs and technical upgrades to access to high-quality replacement parts that match the quality of original components (and often even exceed it). This allows you to effectively extend the machine’s service life and reduce the risk of unplanned downtime.
Contact us today and tell us how we can support your operation
Contact us
Contact us!
Was this content helpful? Rate it!