Technical Specifications: Caterpillar 8T-7581 Lip Type SealThe Caterpillar 8T-7581 Lip Type Seal (Crankshaft Front/Rear Oil Seal) is a high-performance rotary shaft sealing component. It is engineered to retain critical lubricating oil within the engine crankcase while preventing dirt, water, and external contaminants from entering the assembly.
1. Core Dimensions & Weight
- Inner Diameter: 69.85 mm (2.75 in)
- Outer Diameter: 88.95 mm (3.50 in)
- Seal Width / Thickness: 11.50 mm (0.45 in)
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Net Weight: 0.05 kg (0.11 lbs)
2. Material & Manufacturing Specs
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Seal Lip Material: Premium Fluoroelastomer (FKM / Viton) optimized for high thermal stability and chemical resistance to synthetic and mineral oils.
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Casing Material: Corrosion-resistant steel shell matrix for structural rigidity during press-fit installation.
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Design Feature: Spring-loaded primary sealing lip with an integrated hydrodynamic helix to pump oil back into the oil pan during rotation.
3. Equipment & Engine Compatibility
This lip seal is utilized across numerous heavy-duty Caterpillar powertrain, hydraulic, and engine systems:
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Engine Applications: Standard industrial, marine, and truck engines including CAT 3304, 3306, 3406, 3408, 3412, 3508, 3512, and 3516 series.
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Earthmoving & Mining Equipment: Caterpillar D6, D7, D8, D9, and D10 Track-Type Tractors, 12H / 14H / 16H Motor Graders, and 980 / 988 Wheel Loaders.
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Transmission & Transfer Case: Implemented in specific planetary transmission groups, torque converters, and output shaft assemblies.
4. Part Cross-References
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Alternative Part Numbers: 8T7581, 8T-7581
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