This part is designed to fit your Cat equipment based on the manufacturer’s specifications.
Any changes to the manufacturer’s configuration might result in the product not fitting your Cat equipment. Please consult your Cat Dealer before purchasing to ensure that this part is appropriate for your Cat equipment in its current condition and assumed configuration. This indicator cannot guarantee compatibility for all parts.
Remanufactured
Non-Returnable
Kit
Replaced
Remanufactured
Non-Returnable
Kit
Replaced
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Warranty Information
Warranty Information
Generally, warranty for parts purchased on Parts.Cat.Com is 12 months from the invoice date as defined in the Caterpillar Limited Warranty. Parts Warranty covers defects in material and workmanship throughout the Warranty period once it has been installed. For complete Warranty detail contact your local Cat Dealer.
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Return Policy
Return Policy Information
Unless otherwise noted by a non-returnable part
icon, most parts can be returned to your authorized Cat® dealer under their return policy.
Need More Help? Contact Us
Find a DealerEmail
Parts diagram for 121-7138
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Description for part number 121-7138
Description: O-Rings are mainly used in static application as both axial or radial seals to prevent leakage and contamination.
Attributes: Cat® O-Rings are made from materials that are matched to the fluids, temperatures and pressures found in Cat® engines and machines. The materials resist wear and extrusion, and provide superior resistance to seal compression set. In addition, certain Cat® O-Rings are coated with PTFE to minimize seal twisting and cutting during seal installation.
Dimensions of our O-Rings are consistently held to tight tolerances to ensure they fit properly into seal grooves with the necessary seal compression.
With over 2500 O-Rings in different sizes and materials, Cat® O-Rings are your best solution for your Cat and other mobile equipment O-Ring needs.
Cat® sealing system uses a robust design, testing, and validation process. Buy the latest Genuine Cat seal to protect your investment.
Applications: O-Rings are used in a wide variety of applications throughout the entire Cat® product line.
Notes: Dimensions and Material Descriptions provided for reference only. Color may differ from image.
Polymer: HNBR (Hydrogenated nitrile)
Material: Rubber
Material Hardness: 80A
Seal/O-Ring Type: Standard
Primary Sealing Material: Rubber
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Compatible Models for part number 121-7138
MINI HYD EXCAVATOR
305C CR 304C CR
TRACK FELLER BUNCHER
TK752 TK751 TK741
WHEELED EXCAVATOR
M320F M316F M322F M314F M318F
EXCAVATOR
345B II 345D L 336 GC 329D L 325D L M315F 320B 320D 336D 312C 324D 320D GC M317F 320D2 M325D MH 320D LRR 330C L 336D L 374D L 320 390D 320D L 320B L 312C L M318F 323 350-A L 322C FM 320D RR 320D2 L 390D L 340D L 323D L 325C FM 330D2 L M325D L MH 329D 349D 350 L 324D L 330D L 330D FM 320 GC 345D
MOBILE HYD POWER UNIT
324D LN 325D L 325D 323D L
View More
DiagramDescriptionSpecificationsCompatible Models
Parts diagram for 121-7138
View Detailed Parts Diagrams
Add Your Equipment
Description for part number 121-7138
Description: O-Rings are mainly used in static application as both axial or radial seals to prevent leakage and contamination.
Attributes: Cat® O-Rings are made from materials that are matched to the fluids, temperatures and pressures found in Cat® engines and machines. The materials resist wear and extrusion, and provide superior resistance to seal compression set. In addition, certain Cat® O-Rings are coated with PTFE to minimize seal twisting and cutting during seal installation.
Dimensions of our O-Rings are consistently held to tight tolerances to ensure they fit properly into seal grooves with the necessary seal compression.
With over 2500 O-Rings in different sizes and materials, Cat® O-Rings are your best solution for your Cat and other mobile equipment O-Ring needs.
Cat® sealing system uses a robust design, testing, and validation process. Buy the latest Genuine Cat seal to protect your investment.
Applications: O-Rings are used in a wide variety of applications throughout the entire Cat® product line.
Notes: Dimensions and Material Descriptions provided for reference only. Color may differ from image.
Polymer: HNBR (Hydrogenated nitrile)
Material: Rubber
Material Hardness: 80A
Seal/O-Ring Type: Standard
Primary Sealing Material: Rubber
View More
Compatible Models for part number 121-7138
MINI HYD EXCAVATOR
305C CR 304C CR
TRACK FELLER BUNCHER
TK752 TK751 TK741
WHEELED EXCAVATOR
M320F M316F M322F M314F M318F
EXCAVATOR
345B II 345D L 336 GC 329D L 325D L M315F 320B 320D 336D 312C 324D 320D GC M317F 320D2 M325D MH 320D LRR 330C L 336D L 374D L 320 390D 320D L 320B L 312C L M318F 323 350-A L 322C FM 320D RR 320D2 L 390D L 340D L 323D L 325C FM 330D2 L M325D L MH 329D 349D 350 L 324D L 330D L 330D FM 320 GC 345D
MOBILE HYD POWER UNIT
324D LN 325D L 325D 323D L
View More
Warranty Information
Warranty Information
Generally, warranty for parts purchased on Parts.Cat.Com is 12 months from the invoice date as defined in the Caterpillar Limited Warranty. Parts Warranty covers defects in material and workmanship throughout the Warranty period once it has been installed. For complete Warranty detail contact your local Cat Dealer.
Need More Help? Contact Us
Find a DealerEmail
Return Policy
Return Policy Information
Unless otherwise noted by a non-returnable part
icon, most parts can be returned to your authorized Cat® dealer under their return policy.
