Oil Seal

Selecting the Right Oil Seal

In off-road and heavy equipment engines, oil seal leaks often appear around crankshafts, axles, or rear mains. If not addressed early, it can lead to costly repairs. When these seals wear out, you’ll notice oil buildup under the engine, fluid contamination, or pressure loss — all early signs of a rear main seal oil leak. Operating with compromised seals can damage bearings or lead to reduced oil pressure.

When selecting a replacement oil seal, consider:

• Operating Environment: Exposure to dirt, water, or chemicals.
• Temperature & Pressure: High heat applications may require FKM or PTFE materials.
• Shaft Speed: Faster rotation demands better wear resistance.

Inspect existing seals for signs of oil seal leak — cracks, brittleness, or oil around the shaft area — as these indicate replacement is necessary.

Oil Seal Types and Applications

Oil seals come in multiple configurations depending on operating pressure, shaft speed, and environment. Common oil seal types include single lip, double lip, and PTFE seals. Each design ensures optimized performance — from preventing dust intrusion in tractors to sealing high-pressure systems in excavators or industrial pumps.

Understanding oil seal types and applications ensures a proper substitution across brands and helps compare compatibility for different models. Explore more on our sealing & fastening parts page for related components like gaskets and O-rings that ensure full sealing integrity.

Oil Seal Part Number System

Every oil seal follows a structured identification system, making it easier to locate replacements:

• Dimension Code: Inner Diameter × Outer Diameter × Width (e.g., 45×65×10)
• Material Type: NBR (nitrile rubber), FKM (fluoroelastomer), PTFE
• Seal Design: SL (single lip), DL (double lip)

For example, a seal marked “45×65×10 DL FKM” means it’s a 45mm shaft, double lip, FKM material oil seal. Always verify measurements before ordering to ensure a perfect fit.

Why Choose Our Oil Seals?

As a trusted Tier 1 supplier, we offer precision-engineered seals compatible with major brands such as Komatsu, Isuzu, Kubota, and John Deere. Our oil seals are built from advanced elastomers and metals to withstand heat, friction, and pressure fluctuations — ideal for diesel and hydraulic systems. With worldwide shipping and support, we proudly serve professional mechanics, fleet operators, and off-road equipment owners across the world.