Slewing Rings and Modules for Solar Trackers: Bearings and Housings for Your Plant

Solar trackers are structures that orient photovoltaic panels toward the sun throughout the day to maximize energy capture. The rotation movement is achieved through a slewing ring or slewing module, which is a large-diameter bearing capable of supporting axial, radial loads, and tilting moments.

In solar energy applications, these slewing rings operate with slow and oscillating movements, often in outdoor conditions. Therefore, it is key to choose bearings with good load capacity, effective sealing, and adequate lubrication to avoid premature failures.

At MR Accesorios Industriales, we work with bearings and housings for this type of application. If you need to replace a slewing ring or associated components, we provide quotes based on your technical requirements.

Spherical roller bearings are a common choice in solar trackers because they support combined radial and axial loads and compensate for shaft misalignments. Their self-aligning design makes them robust against structural bending or ground settling.

In our catalog, we carry spherical roller bearings from brands such as SKF, FAG, and LINK-BELT. For example, SKF codes 22325 and 22361, or FAG 20222-MB and 20240-MB, are references used in large-scale applications.

The SKF 223 series is widely used in slewing shaft housings due to its high load capacity. If your solar tracker has a central shaft with this type of bearing, we can quote the exact replacement or a compatible alternative.

In addition to spherical roller bearings, cylindrical roller bearings are used in gearboxes or support points where radial loads predominate. Meanwhile, angular contact bearings support combined loads and can be mounted in pairs to achieve greater rigidity.

At MR, we work with cylindrical roller bearings such as SKF N3055 and RNU 305, or FAG SL182226 and SL183018. For angular contact, we offer references such as SKF 7417 and 7453, FAG 3314 and 3315, and TIMKEN 7310 B and 7211 B.

The choice between one and the other depends on the tracker design: if the movement is very slow with tilting loads, spherical roller bearings are usually the first option. If there are gearboxes, cylindrical and angular contact bearings appear on the intermediate shafts.

SNL split housings are split pedestals that facilitate the assembly and disassembly of bearings on horizontal shafts. In solar trackers, they are used to support the rotation shaft at various points along the panel row.

We carry SKF SNL housings, such as SNL 211 and SNL 216, which are combined with bearings from the 62 or 22 series depending on the shaft diameter. These housings allow faster maintenance because it is not necessary to disassemble the entire shaft to change the bearing.

If your solar plant uses this type of housing, it is important to check the condition of the seals and lubrication. A poorly sealed housing lets in dust and moisture, which shortens the bearing's service life. We advise you on selecting the appropriate housing and bearing.

Solar trackers operate outdoors, exposed to dust, rain, temperature changes, and UV radiation. Lubrication is critical to protect bearings from corrosion and wear. High-quality greases with good adhesion and water resistance are recommended.

At MR, we carry greases and lubricants for bearings in energy applications. We also offer assembly and maintenance tools, such as pullers, induction heaters, and torque wrenches, to intervene in the field safely.

A preventive lubrication plan, with periodic re-greasing according to operating hours, is the best way to avoid unscheduled downtime. If you need to define the correct grease for your slewing rings, we guide you with the manufacturer's specifications.

To quote a replacement, the most practical is to read the code engraved on the bearing or on the housing plate. If the code is blurred, you can measure the inner, outer diameter, and width, and with that we identify the series and type.

In solar trackers, it is common to find bearings from series 222, 223, 230, and 231 of spherical roller bearings, or cylindrical from series NU, NJ, and SL. SNL housings are identified by the number following the letters, for example SNL 211 for a 1211 or 2211 bearing.

If you have a photo of the part or assembly, that also works. At MR Accesorios Industriales, from Buenos Aires, Argentina, we quote the bearing, housing, or lubricant you need for your solar plant.

We work with the leading brands of bearings and components for the energy industry. If you are planning maintenance or repair on your solar trackers, we can help you define the correct spare parts.

Send us the bearing code, measurement, or a photo of the part via WhatsApp or email. We will respond promptly with the quote and available options according to your requirement.

Don't let a slewing ring failure stop your energy generation. Contact us today and ensure the operational continuity of your solar plant.