- Caterpillar Products
- Machines with Grease Lubricated Track with Swage
- Machines with Greased Lubricated Track (GLT)
- Machines with Positive Pin Retention (PPR) Track
- Machines with Positive Pin Retention 2 (PPR2) Track
- Machines with Rotating Bushing Track
- Machines with Sealed Positive Pin Retention (PPR) Track
- Machines with Sealed Track
- Machines with Sleeve Bearing Track
- Machines with SystemOne Undercarriage
- Machines with non-PPR Sealed and Lubricated Track
- Machines with Greased Lubricated Track (GLT)
- Track Drills
- MD5150C (S/N: SEY1-UP)
Introduction
| Revision | Summary of Changes in SEBF8511 |
| 20–23 | Added serial number prefixes for New Product Introduction. |
| 19 | Added serial number prefixes for New Product Introduction.
Updated introduction information. |
| 18 | Added serial number prefixes for New Product Introduction. |
© 2019 Caterpillar All Rights Reserved. This guideline is for the use of Caterpillar dealers only. 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 Undercarriage Reconditioning Bulletin contains the necessary information to allow a dealer to establish a parts reusability program. Reuse and salvage information enables Caterpillar dealers and customers to benefit from cost reductions. Every effort has been made to provide the most current information that is known to Caterpillar. Continuing improvement and advancement of product design might have caused changes to your product which are not included in this publication. This Undercarriage Reconditioning Bulletin must be used with the latest technical information that is available from Caterpillar.
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.
Summary
This bulletin gives the criteria to determine when conventional and inverted Duo-Cone seals can be reused. These seals are used in track rollers and idlers. Reuse seals that are in good condition will help reduce the overall undercarriage reconditioning costs for machine owners.
Safety
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| Illustration 1 | g02139237 |
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.
This bulletin may contain hazardous steps. A safety alert symbol like the one below is used to indicate a hazard.
Warning messages identify a specific, imminent, latent, hazard that has a reasonable probability of resulting in personal injury or death if the warning is ignored.
Conventional Duo-Cone Seals
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| Illustration 2 | g02361736 |
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The cross-section view of a conventional Duo-Cone seal. (A) Outer Area (B) Inner Area (C) Contact Band (1) Rubber Toric Rings (2) Seal Rings | |
Refer to Illustration 2 for conventional Duo-Cone seals. Conventional Duo-Cone seals have two rubber toric rings (1) on the outside diameter of each of the seal rings (2). The two metal seal rings (2) are made so that a narrow flat seal band is located near the outside diameter of the seal ring faces. This contact band (C) is lapped to obtain a smooth and flat surface. As the seals rotate against each other, the area of the contact moves towards the inside diameter. When the area of the contact moves towards the inside diameter, the seals become a “matched pair”.
The toric rings (1) are used to seal between the seal ring and the ramp in the end collar. The toric rings also roll to “force” the seal rings (2) together.
Conventional Duo-Cone seals are used in track rollers and idlers.
Inverted Duo-Cone Seals
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| Illustration 3 | g02361737 |
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A cross-section view of an inverted Duo-Cone seal. (A) Outside (B) Inside (C) Contact Band (1) Rubber Toric Ring (3) Shaft Seal Ring (4) Rubber O-Ring Seal (5) Retainer Seal Ring (6) Seal Ring Ramp | |
Refer to Illustration 3 for inverted Duo-Cone seals. The inverted Duo-Cone seals have one rubber toric ring (1) on the inside diameter of the shaft seal ring (3) and a rubber O-ring (4) on the outside diameter of the retainer seal ring (5). The contact band (C) on the inverted Duo-Cone seal wears from the inside diameter toward the outside diameter.
Recommendations for Reusing Seals
Undercarriage reconditioning costs can be reduced by reusing Duo-Cone seals when possible. Inspect seals and determine if the seals can be reused every time you repair or rebuild idlers or rollers.
Use the following criteria to determine if the seals can be reused:
- Seals should only be reused as matched pairs. If either seal of a pair cannot be reused, discard both seals.
- Seals must have operated without leaks before disassembly.
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NOTICE Measure CONVENTIONAL seals from the INSIDE diameter to the contact band.
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Illustration 4 g02361738 (A) Outside
(B) Inside
(D)3.17 mm (0.125 inch) or greater. - Reuse the CONVENTIONAL Duo-Cone seals, if the contact band (C) is
3.17 mm (0.125 inch) or farther from the INSIDE diameter of the seal ring edge.Show/hide tableNOTICE Measure INVERTED seals from the OUTSIDE diameter to the contact band.
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Illustration 5 g02361739 (A) Outside
(B) Inside
(D)3.17 mm (0.125 inch) or greater. - Reuse the INVERTED Duo-Cone seals, if the contact band (C) is
3.17 mm (0.125 inch) or farther from the OUTSIDE diameter to the seal ring edge.Show/hide table
Illustration 6 g02725047 - Use again if the contact band (C) is continuous and well-defined on the seal ring faces. The contact band (C) must be shiny and polished. Examine the contact band (C) carefully in reflected light.
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Illustration 7 g02361798 - Do not use again if the contact band (C) is not continuous and has scratches, pitted areas, chips, or other damage. Refer to Illustration 7. Discard both seals of the matched pair.
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Illustration 8 g02361799 - Do not use again if the contact band (C) is rusted. Refer to Illustration 8. Discard both seals of the matched pair.
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Illustration 9 g02361800 - Do not use again if the contact band (C) has corrosion and pitting at the edge. Refer to Illustration 9. Discard both seals of the matched pair.
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Illustration 10 g02361801 - Do not use again if the contact band (C) has galling. Refer to Illustration 10. Discard both seals of the matched pair.
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Illustration 11 g02361802 - Do not use again if the seal ring ramp (6) is shiny and polished as shown in Illustration 11. Discard both seals of the matched pair. The seal ring ramp (6) must have a dull (not polished) finish. A shiny or polished ramp indicates that the rubber toric was slipping on the ramp during machine operation.
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Illustration 12 g02361796 - Rusted seal ring ramp can be reused.Use again, after the rusted seal ring ramps are properly cleaned and free of rust. Make sure that the seal ring ramp surface does not become polished after removing the rust. Refer to Illustration 12 for a rusted seal ring ramp.
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Illustration 13 g02361797 - Seal ring ramps with an uneven toric pattern can be reused. Use again, as long as the previous toric pattern has not left any wear. Refer to Illustration 1 for an uneven toric pattern.
