Dust, mud, moisture, or regular high-pressure cleaning? In harsh operating environments, bearing selection should not be based solely on dimensions and load capacity. The design of the sealing system can also be an important factor.
Dust, mud, and moisture are everyday challenges for agricultural machinery. However, similar conditions can also occur in crop-processing equipment and other industrial applications exposed to heavy contamination.
In these situations, it is worth asking one simple question: What kind of environment will the bearing operate in?
Why Is Sealing Important in Contaminated Environments?
When selecting a bearing, dimensions, load capacity, and rotational speed are fundamental considerations. However, in contaminated or wet environments, external conditions must also be taken into account.
Bearings may be exposed to dust, mud, moisture, or splashing water, while some equipment is regularly cleaned using high-pressure water.
Under these conditions, the purpose of the sealing system is to help prevent external contaminants from entering the bearing.
Therefore, in applications with a high level of contamination, selecting a bearing based solely on standard bearing parameters may not be sufficient.
The NTN-SNR AGR Sealing System Was Designed for These Conditions
NTN-SNR AGR is a bearing insert solution specifically designed for heavily contaminated and harsh operating environments.
The key principle of the design is that several components work together to provide enhanced protection against external contaminants.
The main features of the AGR design include:
- triple-lip L3 seal for enhanced protection against contaminants,
- zinc-plated shields as part of the sealing system,
- high-performance grease with a 90% fill level,
- lubricated for life, eliminating the need for regular relubrication,
- a sealing system suitable for environments exposed to high-pressure cleaning.
The AGR design can therefore be beneficial beyond agricultural applications. It is worth considering in any application where the bearing is exposed to heavy contamination, moisture, or regular cleaning.
Relevant Beyond Agricultural Machinery
AGR may first bring agricultural applications to mind – and for good reason. Bearings in agricultural machinery often operate in dusty, muddy, and wet environments.
However, from the bearing’s perspective, it is not the industry itself that matters most, but the operating environment.
Therefore, AGR is also worth considering for other applications where:
- the bearing is exposed to heavy dust or mud contamination,
- the equipment is regularly exposed to moisture or splashing water,
- high-pressure cleaning is used,
- the bearing is difficult to access, making lifetime lubrication an advantage,
- or recurring problems occur due to a contaminated operating environment.
UC…AGR or EX…AGR?
If AGR is suitable for the application, the next step is to select the appropriate version.
AGR sealed bearing inserts are available with two different shaft locking methods:
UC…AGR – set screw shaft locking, suitable for both directions of rotation.
EX…AGR – eccentric locking collar design, suitable for one specified direction of rotation.
When selecting the appropriate type, the locking method and the operating conditions should therefore be considered in addition to the bearing dimensions.
Installing It in an Existing Bearing Housing? Here’s What to Consider!
Due to the reinforced AGR sealing system, it is important to ensure the correct combination of the bearing insert and housing.
If you want to replace the current insert in an existing bearing housing with an AGR version, check the compatibility of the bearing insert and housing before installation.
This is particularly important when replacing a bearing or upgrading an existing design, where not only the shaft and outer dimensions but also the complete installation configuration must be suitable.
The NTN-SNR AGR catalogue contains dimensional data for the UC…AGR and EX…AGR versions, as well as technical details of the AGR sealing system.
Don’t Just Consider the Machine the Bearing Will Be Installed In. Consider the Environment It Will Operate In.
If you already know the required type or size, you can find more information about NTN-SNR AGR bearings and the available solutions on csapagy.hu.
If you would like to replace an existing bearing, or if you are unsure whether AGR is suitable for your application, we can help you select the right solution.
Provide the part number or dimensions of the existing bearing, along with the main operating conditions of the application, and our team will help you find the right solution.
Frequently Asked Questions About NTN-SNR AGR Bearings
What is an NTN-SNR AGR bearing?
The NTN-SNR AGR is a bearing insert with an enhanced sealing system, designed for heavily contaminated, dusty, muddy, or wet operating environments.
The AGR sealing system features a triple-lip L3 seal, zinc-plated shields, and a high 90% grease fill level to help protect the bearing.
What are AGR bearings used for?
AGR bearings can be beneficial in applications where the bearing is exposed to dust, mud, moisture, splashing water, or regular high-pressure cleaning.
In addition to agricultural machinery, they are also worth considering for equipment operating in other heavily contaminated industrial environments.
Are AGR bearings only suitable for agricultural machinery?
No. Although the AGR design is particularly well suited to the dusty, muddy, and wet conditions commonly found in agriculture, the operating environment rather than the industry itself is the key factor.
AGR bearings may also be suitable for other contaminated applications or equipment that is regularly cleaned.
Is the NTN-SNR AGR suitable for environments exposed to high-pressure cleaning?
Yes. NTN-SNR specifies the AGR sealing system as suitable for environments exposed to high-pressure cleaning.
The triple-lip L3 seal and protective shields provide enhanced protection against external contaminants.
Do AGR bearings require relubrication?
The AGR bearing insert is lubricated for life, so under normal operating conditions there is no need for regular relubrication.
The bearing is filled with high-performance grease at a 90% fill level.
What is the difference between UC…AGR and EX…AGR bearings?
The main difference is the shaft locking method.
The UC…AGR version uses set screw locking and is suitable for both directions of rotation.
The EX…AGR version uses an eccentric locking collar and is suitable for one specified direction of rotation.
Can an AGR bearing be installed in an existing bearing housing?
Not in every case. Due to the reinforced AGR sealing design, the compatibility of the bearing insert and the existing housing should be checked before replacement or installation.
Therefore, the selection should not be based solely on the bore size or the part number of the existing bearing.
Where can I find NTN-SNR AGR bearing dimensions?
The NTN-SNR AGR catalogue contains dimensional data for the UC…AGR and EX…AGR versions, as well as technical information about the AGR sealing system.
Available AGR bearings can also be viewed in the csapagy.hu product range.
