PIN 2H2525 - Caterpillar

LIP TYPE SEALS
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Background
Lip type seals are used to seal the bearing supported sealing journals and the contact surfaces in an oil compartment.STORAGE
Sealing Journal Storage
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Best storage practice for sealing journals
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Acceptable storage practice for sealing journalsSealing journals should be stored with a sealing journal cap and in conformance with the storage and shelf life as per Contamination Control Guidelines, PEBJ0002, "Caterpillar Dealer Contamination Control Compliance Guide". A cap provides protection to the critical areas of the sealing journal. The use of a cap reduces the risk of damage and contamination to the part.Illustration 2 shows an example of best storage practice of a sealing journal.Illustration 3 shows the minimum acceptable alternative to a cap.Bore Storage
Bores should be stored in a manner that will reduce contamination and risk damage to the inside of the bore. Storage should also conform to Contamination Control Guidelines, PEBJ0002, "Caterpillar Dealer Contamination Control Compliance Guide".CLEANLINESS
Seal Cleanliness
Lip seals should be assembled in the housing only as needed. Building the inventory of lip seal sub assemblies should be avoided because they can be easily contaminated or damaged. Any work in process should be covered and protected from contamination and damage.Bore & Sealing Journal/Contact Surface Cleanliness
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Clean bore ready for assembly
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Maintained toolSeal bore and tooling should be free of nicks, burrs, and contamination as shown in the Illustration 4 and Illustration 5.Seal bore, seal tooling, and sealing journals/contact surfaces should be wiped clean with lint-free wipe to remove contamination.Presence of rust preventative coatings should also be removed from the seal bore and sealing journals/contact surfaces as the rust preventative coatings may interfere with the sealing ability of the seal.Tool return marks in the bore must be avoided as leakage can occur at the seal outside diameter.Tooling Cleanliness
Tooling cleanliness should conform to Contamination Control Guidelines, PEBJ0002, "Caterpillar Dealer Contamination Control Compliance Guide".To help protect the seal tooling from damage, it is important that proper lip-seal tooling storage needs to be provided. Placing seal tooling on a metal surface can severely damage the tool due to metal-to-metal contact.Seal tooling should be stored on a soft, forgiving surface such as nylon, high-density polyethylene (HDPE), and so on. Proper storage facilities must be provided to assembly area to reduce risk of damage to tool.Tooling Storage Cleanliness
Tooling storage cleanliness should conform to Contamination Control Guidelines, PEBJ0002, "Caterpillar Dealer Contamination Control Compliance Guide".Press tables and tooling storage surfaces should be clean and free from contamination such as dirt, filings, or other debris.HANDLING
Handling of the Seal
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Proper handling of lip sealMany seals are pre-lubricated. Do not remove the lubrication on pre-lubricated seals.Lip seals should only be handled on the outer edge. To avoid contamination, the sealing surface should not be touched. Refer to Illustration 6 for proper handling.Many seals come with a polytetrafluoroethylene (PTFE) coating on the seal. Do not remove the coating or damage the coating in any way. Handle with proper and adequate care.Note: PTFE is more commonly referred to as Teflon from Dupont.Handling of Mating Components
Lip seals are sensitive