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Trailer hub oil seals play a critical role in maintaining the integrity of the wheel hub assembly on trailers and other towed vehicles. These seals are designed to prevent the leakage of lubricating oil and the ingress of contaminants, ensuring the proper functioning and longevity of the wheel bearings and other internal components. The trailer hub oil seal is typically positioned within the hub assembly, creating a barrier that helps retain the lubricant and protect the bearings from moisture, dirt, and debris.

Begin with a thorough inspection of all involved surfaces:shaft sealing surface and housing bore, seal lip(s), and outside diameter. Maintaining the integrity of the sealing lips is “Priority 1″. The slightest tear or nick can develop into a more significant issue during operation.


Vulcanizates of several fluoroelastomers, listed in Table 14.1, were exposed to a standard 5W-30 engine oil, ASTM Service Fluid 105, for up to 6 weeks at 150°C (302°F).5 The oil was changed weekly, but was not aerated. Retained elongation was measured after exposure for 1, 2, 3, and 6 weeks; data are shown in Fig. 14.3. The results indicate that bisphenol-cured FKM-A500 VDF/HFP copolymer, FKM-B600 VDF/HFP/TFE terpolymer, and peroxide-cured FEPM-7456 TFE/P/VDF terpolymer lost most of their original elongation over the course of the test exposure, indicating considerable additional cross-linking occurred by reaction with amine- and phenol-containing oil additives. The other fluoroelastomers showed better retention of elongation, being much less susceptible to additional crosslinking. Note that FEPM-7456 contains a high level of VDF (about 30%), while FEPM-7506 contains a relatively low VDF level (10–15%) to serve as cure site for bisphenol curing. The other FEPM types contain no VDF.

20 35 7 oil seal. A properly selected and installed oil seal can significantly improve the performance and reliability of the equipment, reducing maintenance costs and downtime.
You may need to take off the air cleaner (See Air filter change ), which may also have pipe connections.
Choosing the right oil seal
1) Common seal types and their features

An oil seal, also known as crankshaft retainer, is a small device, but essential to ensure the proper engine operation. It plays a key role in all moving parts of an engine, acting as a physical barrier. This mechanical seal fulfils the dual purpose of sealing a rotary shaft to maintain the necessary lubrication (avoiding leaks) and preventing other foreign matter from contaminating shafts and bearings in the rotary shaft equipment.