By evaluating factors ranging from oil leaks, wear, hardening, shaft surfaces, rotational speed, and temperature to oil quality, you can minimize downtime and rework, and predict both oil seal life and maintenance intervals.
The oil seal was clearly replaced with a new one, so why is the equipment still leaking oil?
Oil seals harden and wear out after a short period of use. Why is their service life so short?
The dimensions clearly match the original specifications, so why is it still leaking after installation?
Whether it's oil leaks, wear, hardening, damage to shaft surfaces, or issues related to speed, temperature, pressure, lubricant, or materials—you can assess all of these factors at once, saving you the time it would take to guess the cause one by one.
Send us photos of the on-site conditions, the old oil seal, the equipment, or the original specifications, and together we’ll pinpoint the real issue so you can choose the right oil seal the first time and ensure reliable, long-term performance.
Each of these factors contributes to the same result: fewer oil leaks, less downtime, longer-lasting oil seals, and easier maintenance scheduling.
By examining the oil leak location, lip wear, hardening, deformation, and the condition of the shaft surface—and cross-referencing these findings with rotational speed, pressure, and oil quality—we can identify the true cause of failure, restore stable sealing to the equipment, and reduce the need for repeated disassembly and oil replenishment.
Select the appropriate material based on temperature, oil type, rotational speed, and operating environment to ensure that the oil seal is truly suited to the equipment’s operating conditions, providing a stable service life and reducing frequent consumption of spare parts and labor.
By evaluating the shaft diameter, rotational speed, and contact conditions together, we reduce temperature rise at the lip, friction, and abnormal wear, enabling the equipment to maintain a stable seal even during high-speed operation.
In addition to the inner diameter, outer diameter, and thickness, we also verify the shaft diameter, tolerances, mounting seat, and actual fit to ensure the oil seal is the correct size and provides a proper seal once installed, thereby reducing the need for disassembly and rework.
Assess the on-site environment to determine the need for dust protection, water resistance, and auxiliary lips, ensuring that oil seals not only retain lubricant but also minimize the ingress of dust, moisture, and contaminants, thereby extending the service life of bearings and internal components.
By taking into account oil quality, temperature, rotational speed, pressure, operating time, and environmental conditions, the service life of oil seals can be predicted, allowing for early planning of spare parts, maintenance, and downtime.
First, choose the right design, then match the material to the actual operating conditions to minimize situations where “the dimensions are the same but it still leaks” or “it leaks again shortly after installing a new oil seal.”
First, determine whether you need a single-lip, double-lip, dust-proof, or metal-cased seal so that the oil seal meets your equipment's requirements from the start.
The primary sealing lip and secondary dust-proof lip work together to retain lubricant and block out dust and moisture, ensuring the equipment remains durable in typical industrial environments.
See the corresponding operating conditions and material selection →
Oil sealing is achieved using a primary sealing lip, which features a simple and straightforward design, making it an ideal choice for general oil sealing needs and easy to maintain.
See the corresponding operating conditions and material selection →
The lip seal design, combined with the metal housing, ensures that mounting brackets requiring a specific outer diameter can provide both oil sealing and dust protection.
See the corresponding operating conditions and material selection →
A single-seal lip combined with a metal housing ensures a stable fit even when used solely for oil sealing on specific mounting brackets.
See the corresponding operating conditions and material selection →Even for the same oil seal size, the choice of material determines the types of oil it can withstand, as well as its operating temperature, rotational speed, and service life. Only with the right material selection can an oil seal truly last a long time.
General-purpose machinery and common lubricants are highly versatile and suitable for most standard sealing and lubrication needs.
General-Purpose and Common Lubricants
Suitable for high-temperature, harsh oil, and chemical environments, ensuring stable performance under high-temperature conditions.
High-Temperature and Chemical Environments
Suitable for a wide temperature range and special applications, offering both flexibility and stability.
Wide Temperature Range and Flexibility
Commonly used in high-temperature oil applications and automotive drivetrain environments to maintain consistent oil-sealing performance.
High-Temperature Oils and Transmissions
This is an advanced option for applications involving extreme temperatures, chemical media, and low-friction requirements.
Extreme Temperatures · Low FrictionWhen oil seals require high heat resistance and wear resistance, HNBR should be considered; the seal type, compound, and supply specifications should be determined based on the oil type, temperature, and rotational speed.
Heat-Resistant and Wear-ResistantCheck the oil seal design and material based on the equipment, oil type, temperature, and rotational speed.
The crankshaft, transmission, and drive shaft are all subjected to oil, temperature, rotational speed, and vibration. Choosing the right oil seals can reduce oil leaks and ensure the stability of the drivetrain.
When the spindle, gearbox, and hydraulic pump operate for extended periods, reliable oil seals help reduce leaks and unplanned downtime, ensuring that equipment accuracy and uptime are maintained.
In environments with dust, vibration, heavy loads, and prolonged operation, the right oil seals can protect bearings and lubrication systems, thereby reducing the frequency of maintenance on heavy equipment.
Mixing, conveying, and packaging equipment must not only prevent lubricants from leaking but also meet cleanliness and material requirements to ensure reliable production and hygiene management.
Mixing, conveying, and packaging equipment must prevent lubricant leaks while ensuring compliance with equipment cleanliness and material requirements. Verify the oil seal materials and design based on operating conditions to ensure that both sealing and maintenance requirements are met.
When equipment has special requirements regarding media, low friction, or extreme temperatures, first verify the shaft surface, rotational speed, and sealing conditions, and then evaluate the use of PTFE oil seals or custom designs; cleanliness and vacuum requirements should be confirmed based on the actual equipment specifications.
Each batch of parts is accompanied by comparison results and documentation, so they can be accepted directly by the quality control department.
FTIR Material ComparisonWe verified the feedstock material through spectral analysis, and it matched the specifications.
Test reports are traceableThe comparison results and inspection records are retained and can be provided upon request.
The documents are in order, and the specifications are ready for acceptance.Material certification and compliance documentation are provided based on manufacturer or third-party documents, including requirements such as REACH, RoHS, FDA, COA, PFAS, and PFOS.
Simultaneous Verification of Dimensions and AppearanceDimensions and appearance are checked on a batch-by-batch basis and match the drawings.
After reevaluating the oil seal specifications and operating conditions, the equipment’s sealing stability improved, and the frequency of maintenance and downtime decreased significantly.
Select appropriate sealing materials and oil seal solutions based on the operating conditions of the food processing equipment, while also taking into account the equipment’s cleaning and maintenance requirements.
Old oil seals, photos of the equipment, shaft diameter, dimensions, oil type, temperature, and rotational speed—send whatever you have for now.
Take photos of the lip of the old oil seal, the oil leak location, and the equipment installation location.
Inner diameter, outer diameter, thickness, shaft diameter, and mounting flange dimensions.
Types of lubricants, normal and maximum temperatures, and pressure.
Rotational speed, operating time, and on-site environmental conditions such as dust or moisture.
Examine the oil leak location, lip wear, hardening, deformation, and the condition of the shaft surface as a whole, and then cross-reference these findings with the rotational speed, pressure, and oil quality to identify the true cause of failure.
First, decide whether you need a single-lip, double-lip, dust-proof, or metal housing; if you need dust protection, choose the double-lip option; if the mounting bracket requires a metal outer diameter, choose the metal housing.
Select based on temperature, oil type, rotational speed, and operating environment: NBR for general-purpose applications; FKM for high-temperature and chemical environments; ACM for high-temperature oils and automotive transmissions.
Sure. Please send whatever you have—photos of the old oil seal and the equipment, shaft diameter, dimensions, oil type, temperature, and rotational speed.
Material documents are verified based on manufacturer or third-party data; incoming materials undergo FTIR material verification, and dimensions and appearance are verified simultaneously.
It’s fine if you only have an old oil seal on hand. Send us whatever you have—the old oil seal, photos of the equipment, shaft diameter, dimensions, oil type, temperature, and rotational speed—and we’ll help you figure out the next steps.
