Transmission Seal Kit 4143 298 009 For 2HL100 Excavator Loaders Graders Parts -30°C to +150°C

• Interference Fit and Spring Pressure: The inner diameter of the seal lip is slightly smaller than the shaft diameter, forming an interference fit after installation, allowing it to tightly grip the shaft journal.
• Hydrodynamic Return Design: The lip contact surface is usually engraved with fine spiral lines or patterns. A very small amount of leaking oil is pumped back into the transmission, achieving dynamic sealing.
• Static Sealing Assistance: The outer diameter of the seal and the transmission housing bore form an interference fit, creating a static seal to prevent oil leakage from the outer ring.
• Dustproof and Main Seal Integration: Some designs employ a double-lip structure; the main lip seals the oil, while the secondary lip (outer side) is specifically for dustproofing.

• Main Sealing Lip Material: Typically made of acrylic rubber or fluororubber
• ACM: Excellent resistance to high-temperature gear oils, oxidation, and ozone; a commonly used material for gearbox seals
• FKM: Performs better in extreme high temperatures and broader chemical compatibility (e.g., synthetic oils with special additives)
• Metal Skeleton: Generally made of low-carbon steel with rust-proofing treatment (e.g., galvanizing), providing structural strength and secure bond with housing
• Spring: Made of stainless steel, providing durable elasticity
• Outer Diameter Coating: May be coated with rubber or sealant layer to enhance static sealing effect

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