Cassette & Combi Seals

GRN Cassette & COMBI Oil Seals - Heavy Duty Shaft Seals

GRN Cassette and COMBI Oil Seals - Heavy Duty Shaft Sealing Solutions

GRN cassette and COMBI oil seals are specialized rotary shaft sealing solutions designed for machinery operating in heavily contaminated and demanding environments. Their advanced construction provides more extensive protection than a conventional radial shaft seal, helping prevent mud, water, dust and abrasive contaminants from reaching bearings, gearboxes and other critical components.

These sealing systems are particularly important in agricultural machinery, construction equipment, axles, wheel hubs, gearboxes, transmissions and heavy-duty drive systems.

What Is a Cassette Oil Seal?

A cassette seal, also known as a cassette oil seal or integrated rotary shaft seal, is a compact sealing system designed for demanding operating conditions.

Depending on its construction, a cassette seal can integrate:

primary oil sealing
its own running surface
dust protection
multiple protective lips
labyrinth sealing
grease-filled protective zones

Unlike a conventional oil seal, the cassette design creates several barriers between the external environment and the main sealing lip.

Why Are Cassette Seals Used?

Conventional radial shaft seals work effectively in many standard applications. Heavy-duty machinery, however, can expose the sealing system simultaneously to:

mud
dust
water
sand
abrasive particles
vibration
temperature changes
intensive mechanical operation

A multi-stage cassette sealing system helps prevent these contaminants from reaching the primary sealing zone.

This makes cassette seals particularly suitable for machines working outdoors, off-road or in heavily contaminated industrial environments.

Integrated Running Surface

One of the major advantages of many cassette seal designs is an integrated running surface.

Instead of the primary sealing lip operating directly against the machine shaft, the cassette can provide its own optimized counterface.

Depending on the design, this can:

protect the shaft against localized wear
provide a controlled sealing surface
reduce dependence on the original shaft surface
simplify the sealing arrangement

Exact shaft and housing requirements should always be checked for the specific cassette seal design.

GRN COMBI Seals

GRN COMBI seals combine the primary shaft sealing function with additional protection against external contamination.

They are designed for applications where a conventional single sealing lip may not provide sufficient protection.

Typical applications include:

agricultural machinery
construction machinery
gearboxes
wheel hubs
axles
final drives
reducers
industrial drive systems

Cassette Seal vs COMBI Seal

Both technologies provide enhanced shaft protection, but they should not automatically be considered identical.

A cassette seal is typically a highly integrated sealing unit that may incorporate its own running surface and a multi-stage contamination barrier.

A COMBI seal combines the primary sealing function with additional protective elements, but its exact construction depends on the specific profile.

When replacing either type, always verify dimensions, seal design, running surface and installation requirements.

Protection Against Mud, Water and Dust

Protection against contamination is one of the primary reasons for using cassette and COMBI seals.

In demanding machinery, the sealing system must often perform two functions simultaneously:

retain lubricant inside the mechanism

and

prevent external contaminants from entering

Multi-lip and labyrinth designs provide additional barriers against:

mud
water
dust
sand
soil
abrasive particles

This can help protect bearings, gears and other expensive mechanical components.

Cassette Seals for Agricultural Machinery

Agricultural machinery is one of the most important application areas for cassette seals.

Tractors, harvesters and agricultural equipment operate in environments containing:

soil
dust
mud
moisture
sand
crop residues
abrasive contamination

For this reason, cassette seals are widely associated with agricultural axles, wheel hubs, transmissions and drive systems.

Cassette Seals for Construction and Heavy-Duty Machinery

Similar conditions occur in:

excavators
wheel loaders
road construction machinery
mining equipment
off-road vehicles
heavy industrial equipment

In these applications, protecting bearings and transmissions against contamination can be just as important as retaining oil or grease.

Cassette Seals for Axles and Wheel Hubs

Axles and wheel hubs are characteristic applications for heavy-duty cassette sealing systems.

The seal may need to retain lubricant while simultaneously protecting the mechanism against water, mud and abrasive contamination.

An integrated cassette construction is particularly useful where conventional sealing arrangements would require several separate components.

Cassette Seals for Gearboxes and Transmissions

Gearbox shaft seals operate between a rotating shaft and stationary housing.

In contaminated environments, the sealing system must withstand both:

lubricant exposure from inside
contamination from outside

Cassette and COMBI designs create additional protective barriers around the primary sealing area, making them suitable for demanding gearbox and transmission applications.

Multi-Lip Seal Design

A multi-lip construction allows different sealing elements to perform different functions.

The primary lip can retain lubricant, while additional lips help protect against:

dust
water
mud
abrasive contamination

This reduces direct exposure of the primary sealing lip to the external environment.

Labyrinth Protection

Many heavy-duty sealing systems also use a labyrinth sealing arrangement.

The labyrinth creates a longer and more difficult path for contaminants before they can reach the primary sealing lip.

Some designs also incorporate grease within the protective zone, creating an additional barrier against moisture and contamination.

Cassette and COMBI Seal Materials

Material selection depends on the specific seal design and operating environment.

Materials used in rotary shaft sealing systems can include:

NBR - widely used for conventional oil sealing applications.

FPM/FKM - selected where higher temperature capability and compatibility with demanding media are required.

PTFE - used in specialized designs requiring specific frictional, thermal or chemical properties.

The entire cassette and COMBI category should not be assigned one universal temperature range. Actual operating limits depend on material, seal construction, shaft speed and operating medium.

How to Select a Cassette or COMBI Seal

Before selecting a replacement, verify:

Dimensions: shaft diameter, housing bore and seal width.

Seal Type: cassette, COMBI or another specific profile.

Operating Medium: oil, grease or another lubricant.

Environment: mud, dust, water, sand or other contaminants.

Temperature: normal and maximum operating temperature.

Shaft Speed: affects friction, heat generation and wear.

Installation Requirements: according to the specific sealing system.

Dimensions alone are not sufficient when replacing an integrated cassette seal.

Cassette Seal Installation

Cassette seals require careful installation.

Important installation principles include:

clean the shaft and housing
inspect the mounting surfaces
prevent seal misalignment
press the seal evenly into position
do not separate integrated cassette components
use an appropriate installation tool
verify correct orientation

Incorrect installation can damage the sealing lips or integrated running surface before the machine begins operating.

GRN Cassette and COMBI Oil Seals

Cassette and COMBI seals are an important part of the GRN technical sealing range.

For this product group, the positioning is clear:

GRN - technical shaft sealing solutions for agricultural, industrial and heavy-duty machinery.

Cassette and COMBI seals extend the GRN portfolio beyond conventional radial oil seals into more demanding applications requiring enhanced contamination protection.

GRN Technical Sealing Range Since 2007

TG Ersatzteile Polska Sp. z o.o. was established in 2002. Five years later, in 2007, GRN oil seals were introduced to the company's product range.

Today, the GRN range includes both conventional radial shaft seals and more specialized sealing solutions for demanding machinery.

Cassette and COMBI seals are particularly important within this range because they address applications where contamination, moisture and abrasive particles are major challenges for the sealing system.

GRN for Agriculture, Construction and Heavy Duty

GRN cassette and COMBI seals are relevant to:

agricultural machinery
tractors and harvesters
construction equipment
heavy-duty machinery
industrial plants
machine manufacturers
maintenance departments
MRO organizations
repair workshops
technical distributors
B2B customers

For these applications, seal failure can result not only in lubricant leakage but also in contamination of expensive bearings, gears and drivetrain components.

Operational Advantages

Multi-stage protection: helps protect against mud, water, dust and abrasive contamination.
Integrated design: cassette seals can combine primary sealing, running surface and contamination protection.
Heavy-duty applications: suitable for demanding agricultural, construction and industrial machinery.
Bearing and gearbox protection: helps prevent contaminants from reaching critical mechanical components.
Different constructions: cassette and COMBI designs allow selection according to the application.
GRN range: specialized shaft sealing solutions available in the TG Ersatzteile Polska portfolio since 2007.

FAQ - GRN Cassette and COMBI Seals

What is a cassette oil seal?
A cassette seal is an integrated rotary shaft sealing system that can combine the primary oil seal, its own running surface and multiple contamination barriers in one unit.

Where are cassette seals used?
They are commonly used in axles, wheel hubs, gearboxes, transmissions and agricultural, construction and heavy-duty machinery.

Why are cassette seals suitable for agricultural machinery?
Their multi-stage construction provides enhanced protection in environments exposed to soil, mud, dust, moisture and abrasive contamination.

What is an integrated running surface?
It is a counterface incorporated into the sealing unit. The sealing lip operates against this surface instead of directly against the machine shaft.

Are cassette and COMBI seals the same?
Not necessarily. Both provide enhanced protection, but their internal construction and installation requirements can differ.

Can a cassette seal be replaced with a conventional oil seal?
Not automatically. Dimensions, construction, running surface and installation requirements must all be verified.

Do all cassette seals have the same temperature range?
No. Operating temperature depends on the material, construction and specific application.

GRN Cassette and COMBI Seals - Warehouse and Store in Lublin

Mark: GRN

Diameter in. (mm): 110

Diameter out. (mm): 140

Height (mm): 14.5/16

Package: 1 pcs.

€10.34 (net)

Price for: 1pcs.

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