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Introduction
| Revision | Summary of Changes in SEBF9247 |
| 02 | Updated Copyright date to 2017.
Added Caterpillar confidential Yellow Statement.. Removed old Repair Process Engineering Point of Contact. Added new Repair Process Engineering Point of Contact. Added "Think Safety" Graphic. Added cassette style seal lubrication instruction to the Lubrication Location section. |
| 01 | Correction to NOTE about PTFE seals |
| 00 | Converted to SIS Authoring Format |
© 2017 Caterpillar All Rights Reserved. This guideline is for the use of Cat dealersonly. Unauthorized use of this document or the proprietary processes therein without permission may be violation of intellectual property law.
Information contained in this document is considered Caterpillar: Confidential Yellow.
This guideline enables dealers and dealer customers to benefit from cost reductions made possible through an established parts reusability and salvage program. Every effort has been made to provide the most current information known to Caterpillar Inc. Since the company makes ongoing product changes and product improvements, this guideline must be used with the latest technical information. Using the latest technical information available from Caterpillar ensures that such changes and improvements are incorporated where applicable.
For technical questions when using this document, work with your Dealer Technical Communicator (TC).
To report suspected errors, inaccuracies, or suggestions regarding the document, submit a form for feedback in the Service Information System (SIS Web) Interface.
Canceled Part Numbers and Replaced Part Numbers
This document may include canceled part numbers and replaced part numbers. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.
Summary
This guideline shows visual examples of worn lip seals used on Caterpillar machines. Specifically, the guideline shows illustrations of lip seals and how to handle the seals properly. The guideline also shows how to install the lip seals properly.
Important Safety Information
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| Illustration 1 | g02139237 |
Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly.
Improper operation, lubrication, maintenance, or repair of this product is dangerous. Improper methods could result in injury or death.
Do not operate or perform any lubrication, maintenance, or repair of this product, until you understand the operation, lubrication, maintenance, and repair information. Safety precautions and warnings are provided in this manual and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons.
Hazards are identified by a safety alert symbol. Safety alert symbols are followed by a signal word such as "Warning" that is shown below.
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Improper operation, lubrication, maintenance or repair of this product can be dangerous and could result in injury or death. Do not operate or perform any lubrication, maintenance or repair on this product, until you have read and understood the operation, lubrication, maintenance and repair information. |
Safety precautions and warnings are provided in this manual and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons.
The hazards are identified by the safety alert symbol which is followed by a signal word such as danger, warning, or caution. The "WARNING" safety alert symbol is shown below.
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| Illustration 2 | g00008666 |
This safety alert symbol means:
Pay attention!
Become alert!
Your safety is involved.
The message that appears under the safety alert symbol explains the hazard.
Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication.
Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The safety information in this document and the safety information on the machine are not all inclusive. If a tool, a procedure, a work method, or an operating technique that is not recommended by Caterpillar is used, ensure that the procedure is safe for all personnel around the machine. Ensure that the product will not be damaged or that the product will not be made unsafe by the operation, lubrication, maintenance, or repair procedures.
The information, the specifications, and the illustrations that exist in this guideline are based on information which was available at the time of publication. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete, most current information before you start any job. Caterpillar dealers can supply the most current information.
Safety
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Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the steering system. |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
References
| References | |
| NENG2500 | "Dealer Service Tool Catalog" |
| PEBJ0002 | "Caterpillar Dealer Contamination Control Compliance Guide" |
| PEGJ0075 | "Loctite Cross Reference List for Cat Part Numbers" |
Lip Type Seals
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| Illustration 3 | g03327641 |
Background
Lip type seals, seal the bearing supported sealing journals and the contact surfaces in an oil compartment.
Sealing Journal Storage
Sealing journals should be stored with a sealing journal cap and in conformance with the storage and shelf life as per Caterpillar, PEBJ0002, "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. Refer to Illustration 4 and 5.
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| Illustration 4 | g03327696 |
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An example of best storage practice of a sealing journal. | |
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| Illustration 5 | g03327698 |
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An example that shows the minimum acceptable alternative to a cap. | |
Bore Storage
Bores should be stored in a manner that will reduce contamination and reduce risk of damage to the inside of the bore. Storage should also conform to Caterpillar, PEBJ0002, "Dealer Contamination Control Compliance Guide".
Seal Cleanliness
Lip seals should be assembled in the housing only as needed. Building inventory of lip seal subassemblies should be avoided, because the lip seals 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
Seal bore and tooling should be free of nicks, burrs, and contamination. Refer to Illustrations 6 and 7.
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| Illustration 6 | g03327746 |
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Clean Bore Ready for Assembly | |
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| Illustration 7 | g03327747 |
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Maintained Tool | |
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. 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 OD.
Tooling Cleanliness
Tooling cleanliness should conform to Caterpillar, PEBJ0002, "Dealer Contamination Control Compliance Guide".
To help protect the seal tooling from damage, provide a suitable container to protect the lip-seal tool. 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
Refer to Caterpillar, PEBJ0002, "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 of the Seal
Many seals are pre-lubricated. Do not remove the lubrication on pre-lubricated seals.
Grasp the lip seals on the outer edge only. To avoid contamination, the sealing surface should not be touched. Refer to Illustration 8.
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| Illustration 8 | g03328146 |
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Proper Handling of Lip Seal | |
Many seals come with a PTFE (polytetrafluoroethylene) 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 to the quality of the mating components. Mating component surfaces should be checked for the presence of defects that would compromise sealing, and not be used if such defects are found. These defects include:
- Burrs
- Nicks/Large Scratches
- Contamination Such As: Paint, Metal Shavings (Machining Chips) And Dirt
- Liquid Contamination (Grease)
- Other Debris
- Poor Surface Finish or Porosity
- Visual Out-of-Roundness
Clean cardboard or plastic separators are recommended to prevent damage during the transportation and storage of finish-mating components.
Mating components should be handled in such a way that reduces risk of damage or contamination.
Assembly Aids
Refer to the Disassembly and Assembly Manual for instruction in the use of any assembly aids.
The fluid being sealed is the proper lubricant for use with lip seals and the mating components.
If proper tooling care and contamination control techniques are followed, the necessity to remove supplier-applied sealant is not necessary. Obtaining an assembly aid is not necessary to remove supplier-applied sealant buildup.
Types of Lip Seal Tooling
When installing lip-type seals, proper tooling and tooling care is important and followed.
Refer to the respective Disassembly and Assembly Manual for the tooling used to install the lip-type seal.
Tooling - Care
Before use of the tooling, check the tooling for damage. Tools with damage such as nicks, gouges, missing material, or deformation must be replaced immediately.
Tools should be cleaned daily to remove contamination. If contamination is present, use a clean lint-free wipe to remove the debris. To maintain cleanliness and prevent tool damage, storage fixtures should be cleaned as a part of daily 5S activities.
Note: 5S activities refer to CPS For Dealers related to "Sort, Set, Shine, Standardize, and Sustain. For more details refer to: https://dealer.cat.com/cda/files/2498665.
Do not use a chemical remover to remove supplier-applied sealant buildup from the seal tooling. Various chemicals can deteriorate the coatings on the lip-seals. Reference "Loctite Global Products Guide" to determine which chemical removers can be used. This document can be downloaded at: www.useloctite.com/caterpillar.
Cleaned tooling should be stored in ergonomically designed designated areas that prevent damage to the tools.
Tooling - Inspection
All tooling should be inspected before use for damage. An improperly maintained tool can cause seal damage and increase the risk of leaking due to improper seating of the seal. Tools with damage such as sharp edges, nicks, burrs, "mushroomed" driver heads (applicable to lip seal drivers) need attention fast. The tools should be reconditioned or replaced prior to further use.
Tooling - Storage
Proper lip-seal tooling storage is important and should be available. Storage is used to protect the seal tooling from damage. 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, or high-density polyethylene (HDPE).
Do not store tools in a basket as this type of storage can lead to damage of the tools. Proper storage facilities must be provided to all workstations to reduce risk of damage to tools.
Regular inspection of the storage surface and/or racks is required and shall accompany the maintenance schedule for the seal tooling.
Properly label tooling to reduce risk of misuse or misplacement
Tooling - Maintenance & Damage Reporting
All seal-specific tooling should be placed on a routine maintenance schedule similar to the torque-tooling schedule.
A formal reporting process shall be established at every dealer to report damaged tooling.
To reduce the risk of downtime due to tooling damage, replacement tooling shall be in inventory and available for immediate use. Damaged tools should be replaced immediately since using a damaged tool increases the risk of seal damage or leaks. The use of an unapproved tool will cause damage.
Preassembly Inspection Of Critical Components
Complete a 1-second inspection for seal and mating components for damage and contamination. A 1-second inspection is a quick visual inspection of the part and mating component. The inspection is used to determine if damage is present to either part prior to assembly.
Seal Lubrication Application
Use an eyedropper or spray bottle for lubrication of the seals. Apply a thin film of lubricant to the designated seal surfaces. Do not use bristle brushes, foam pads, or cotton swab type applicators, as the applicators will contaminate surfaces of the seal.
For elastomeric seals the sealing lip and sealing journal should be lubricated using the fluid to be sealed. Do not over-lubricate. Over-lubrication may cause oil/grease to drip or wash down after assembly, which may give the appearance of a leaking seal.
Note: PTFE (polytetrafluoroethylene) seals are intended for dry installation. The sealing lip or the journal is not to be lubricated. Common applications for these seals are in crankshafts (Article 3.0) and water pumps. Refer to appropriate engineering drawing for material specification.
Lubrication Location
For elastomeric seals the sealing lip and sealing journal should be lubricated using the fluid to be sealed.
For rubber outside diameter seals, also lubricate the outside diameter.
For metal outside diameter seals, do not lubricate the outside diameter.
Note: Do not remove grease from pre-greased seals.
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| Illustration 9 | g06227822 |
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Typical example of a cassette style seal. (1) Wear Sleeve (2) Main Auxiliary Lip (3) Primary sealing Lip (4) Lubrication application area. | |
Cassette style seals require lubrication prior to installation. Using the fluid to be sealed, lubricate the (2) main auxiliary lip and the contact point on the corresponding (1) wear sleeve. Refer to Illustration 9 for the (4) area where lubrication is to be applied.
Sealant Use
Some applications may require the use of sealant, commonly referred to as LoctiteTM. If sealant is required, apply the sealant directly to the bore.
Refer to "Loctite Global Products Guide" for a list of acceptable sealants part numbers and the part number application use. This document can be downloaded at www.useloctite.com/caterpillar.
Do not apply sealant directly to seal.
Do not use sealant with rubber outer diameter seals.
When assembled, the shaft and seal must be lubricated with the lubricant being sealed. In water/glycol applications, glycerin is an appropriate substitute.
Note: PTFE seals MUST BE INSTALLED DRY for proper wear-in.
Assembly Tooling Use
Do not bottom the installation tool on housings with as-cast surfaces.
Use the correct seal assembly tool as specified on the Assembly Work Order. Follow the tooling inspection and care processes as designated in Section "Tooling - Care" and "Tooling - Inspection".
Lip Seal Installation Protection
Elastomeric seals that are installed over a shaft with splines, keyways, or rough surfaces, require extra precautions to protect the lip. One-use plastic/rubber nose cones, tape, or oiled paper should be placed over the areas that require extra precautions. One-use plastic/rubber will provide a smooth surface over which to slide the seal. No material having sharp edges should be used for the assembly aid. Inspect the assembly aid after use to ensure that no foreign material was left behind during assembly.
All PTFE (polytetrafluoroethylene) seals require either a wear sleeve or installation sleeve for assembly regardless of the shaft . The sleeve prevents the seal lip from relaxing and being folded under during assembly. Refer to Illustration 10.
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| Illustration 10 | g03328789 |
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Sleeve | |
Seals that can be exposed during painting should be protected from the paint. Preferred practice is to use plastic adapters, plugs, or tape to mask the seal.
Refer to the print to determine the orientation of the sealing element in the housing bore. Generally the spring loaded sealing member face the fluid being sealed. In designed to purge grease applications, the spring must face the air side.
To ensure that the seal has no visual defects, complete a final visual inspection after assembly. Refer to Illustration 11.
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| Illustration 11 | g03328954 |
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Visual Inspection of Seals | |
There is no recommendation to use the test-sealing journal. Do not reuse any sealing journal for testing purposes.