Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
High-Performance COMBI Combination Oil Seal
PU Dust Lip for Contamination Resistance
A high-performance sealing solution tailored for industrial rotating shafts, agricultural machinery (tractors, harvesters), and off-highway drivetrains—ideal for harsh, dusty/muddy environments.
Its core strengths: a wear-resistant, flexible PU dust lip that blocks external dust, dirt, and debris; a premium synthetic rubber (NBR/FKM) seal that stops internal oil leakage, ensuring steady lubrication for moving parts.
With broad compatibility and robust build to handle vibrations/temperature swings, it extends equipment life by preventing contamination damage and lubricant loss. Easy to install, it cuts unplanned downtime and maintenance costs while boosting machinery efficiency—delivering reliable, long-term performance.
5.0
design customization
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Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
1. Product Advantages
Dual Protection Performance: Features a polyurethane (PU) dust lip with exceptional wear resistance and flexibility, effectively blocking dust, dirt, mud, and fine debris from invading mechanical components. The premium synthetic rubber sealing body (NBR/FKM optional) ensures a tight seal to prevent oil/lubricant leakage, avoiding lubrication failure.
Long Service Life: Robust material combination (PU + high-grade rubber) withstands temperature fluctuations (-20°C to 120°C) and mechanical vibrations, reducing replacement frequency by 30% compared to standard seals.
Cost-Efficiency: Minimizes unplanned downtime and maintenance costs by preventing contamination-induced damage (e.g., shaft wear) and lubricant loss, directly boosting equipment operational efficiency.
2. Working Principle
This COMBI seal adopts a "dual-seal structure" design:
Dust-Proof Layer (PU Lip): The flexible PU dust lip maintains constant contact with the shaft surface, forming a physical barrier against external contaminants. Its elasticity ensures tight fitting even with minor shaft deviations.
Oil-Sealing Layer (Rubber Body): The rubber seal lip, reinforced by an internal spring and saddle ring, generates stable radial pressure to cling to the shaft, stopping internal oil from leaking while retaining necessary lubrication for moving parts.
3. Product Details
Material Composition: PU dust lip (hardness 85±5 Shore A), rubber seal body (NBR for general oil resistance, FKM for high-temperature/corrosive environments), carbon steel skeleton (for structural stability).
Structural Features: Built-in anti-drop spring (prevents seal lip deformation), precision-machined lip edge (reduces friction), and smooth outer diameter (easy press-fit installation).
Standard Compliance: Meets ISO 6194 and DIN 3760 standards, compatible with most metric/inch-sized rotating shafts (shaft diameter range: 20mm-150mm).
4. Application Range
Ideal for equipment operating in harsh or dusty environments, including:
Agricultural Machinery: Tractors, harvesters, combine headers, and off-highway vehicle drivetrains.
Industrial Machinery: Conveyor systems, rotating pumps, gearboxes, and motor shafts.
Heavy-Duty Equipment: Construction machinery (excavators, loaders) and mining vehicle transmission systems.
5. FAQ
Q: Can this seal be installed on curved shafts?
A: It is designed for straight rotating shafts; for curved surfaces, contact Forever Seals for custom solutions.
Q: What is the expected service life under heavy-duty use?
A: Typically 18-24 months (varies by environment); regular inspection is recommended for dusty/muddy conditions.
Q: Is it compatible with synthetic lubricants?
A: Yes—choose the FKM rubber option for optimal compatibility with synthetic oils.
6. Forever Seals’ Selling Points
30+ Years of Expertise: Specialized in sealing solutions for industrial/agricultural sectors, with strict quality control (ISO 9001 certified).
Customization Support: Offers tailored seal sizes and material combinations based on customer equipment specifications.
Global After-Sales Service: Provides technical guidance for installation and replacement, with a 12-month product warranty.
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