INA in agriculture: components for harvesters, seeders, norias and storage plants

In harvesters and tractors, INA needle bearings work in final drives, gearboxes and pivot points where space is limited and radial loads are high. Their design with thin, long rollers allows them to withstand large forces with a minimal outer diameter, which is key in agricultural power transmission. We stock codes such as NAO9, and we quote them with the code or measurements.

To identify an INA needle bearing in a machine, it is advisable to measure the inner diameter, outer diameter and width, and check if it has a separate inner ring. Often the code is engraved on the side of the cage or on the edge of the outer ring, but if it is erased, the measurements are the best reference. At MR we quote the exact replacement based on those dimensions or a photo of the part.

A common mistake when replacing INA needle bearings is not checking the condition of the raceway on the shaft or housing. If the raceway is marked or flaked, the new bearing will fail prematurely. That is why we also recommend checking associated components, such as inner rings IR20 or IR22, which are sold separately and often need joint replacement.

Grain norias, conveyor belts and augers in storage plants use INA Y-bearings, also called inserts, mounted in pillow block or take-up housings. These bearings have a spherical outer ring that allows self-alignment, compensating for shaft misalignment and vibrations typical of grain handling. We stock codes such as UK205, UK206 and UK207.

To order an INA insert, besides the code, it is important to know the shaft diameter in inches or millimeters and the type of housing where it is mounted. Each insert goes in a different type of housing, so it is best to confirm the complete assembly. At MR we help you identify the complete assembly so you don't have mounting problems.

A frequent mistake in norias is over-lubricating the Y-bearing, which generates temperature increase and grease loss through the seals. INA inserts come with initial factory lubrication and, under normal conditions, only need periodic checking. If the bearing works outdoors or with a lot of dust, more frequent checks should be scheduled.

Harvesters have multiple cams and guides that control the movement of blades, augers and cleaning systems. INA cam rollers, such as KR22, KR40 and KR26, are rollers with a threaded stud that facilitates direct mounting on the structure and with a thick outer ring for contact with cams or guides.

To identify an INA cam roller, measure the outer diameter, the width of the outer ring and the stud thread. The code is usually engraved on the side face or on the stud, but if it cannot be read, those measurements are enough for us to quote the replacement. It is also advisable to check if the roller has a single or double seal, because in environments with harvest dust the sealed version is preferable.

When mounting a new cam roller, it is key to respect the stud tightening torque and verify that the outer ring rests evenly against the cam. Excessive tightening can deform the outer ring and generate vibrations; a loose one can come undone during harvest. At MR we advise you on the correct adjustment and offer the INA models that best adapt to each point of the machine.

Discharge augers, mixers and agricultural gearboxes generate significant axial loads that radial bearings cannot absorb alone. INA cylindrical roller axial bearings, such as assemblies with washers GS81102, GS81120 and GS81103, are used to absorb axial thrust and are mounted combined with washers and roller cages.

To order an INA axial bearing, it is advisable to identify the code of each washer and that of the roller cage. They are often sold separately and it is easy to get confused, so at MR we quote the complete assembly according to the application. If you have the old part, a photo with a ruler next to it helps confirm the measurements.

A common mistake when installing cylindrical roller axial bearings is reversing the washers, which blocks rotation or damages the rollers. Always respect the position of each washer. It is also important to verify that the shaft and housing have flat, unworn support surfaces so that the load is distributed evenly.

In many agricultural equipment, needle bearings come as loose cages that are mounted directly on the shaft, without machined raceways. INA needle cages, such as K100, K120 and K220, allow repairing pivot points with little radial space. They are used in joints, levers and control mechanisms where radial space is minimal.

To identify an INA needle cage, measure the inner diameter, outer diameter and width, and count the number of needles if possible. The code is usually printed on the edge of the cage, but with the measurements it is enough for us to quote the replacement. It is also advisable to check the condition of the shaft: if it is scratched or marked, the new cage will not last.

A typical mistake when mounting needle cages is not lubricating the assembly well before assembly. The needles need a film of grease or oil to avoid dry rubbing during startup. Also, verify that the shaft surface is in good condition.

Some agricultural mechanisms, such as auger clutches or starting systems, use INA freewheels that transmit rotation in one direction and release in the other. These components prevent load reversal and protect the transmission against sudden reversals. There are also special INA bearings for specific applications, with adapted geometries or materials.

To order an INA freewheel or special bearing, it is essential to have the exact code or, failing that, the complete measurements and a description of the function it performs. At MR we quote the INA replacement you need.

When replacing a freewheel, respect the direction of rotation indicated on the body or in the catalog. An inverted mounting can block the mechanism or leave it without locking, with risk of accident. It is also advisable to check the condition of the internal springs and rollers if the freewheel is disassemblable, and lubricate with the product recommended by the manufacturer.

To quote any INA bearing or component for agricultural machinery, the most practical way is to send us via WhatsApp or email the code engraved on the part or, if it cannot be read, the main measurements: inner diameter, outer diameter and width. A photo of the old part next to a ruler or caliper also helps so we can identify the exact model. At MR we stock INA and respond promptly.

If the component comes from an imported machine and the code is blurry, you can tell us the make and model of the machine, the year and the position where it is mounted. With that data, we look up the corresponding INA reference and quote it.

At MR, from Buenos Aires, Argentina, we distribute INA bearings for the agro-industrial sector: contractors, repair shops, storage plants and machinery factories. Write to us via WhatsApp or email with your inquiry and we will prepare a quote with the exact codes. If you have doubts about which bearing goes at each point, we guide you to choose correctly.