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
Chat with an expert
Will It Fit?Add your equipment to see if this part fits or if there are repair options available.
Add Equipment
Will it fit or looking for a repair?Add your equipment to see if this part fits or if there are repair options available.
Description
Description
Description: Backup rings prevent seal extrusion in high pressure applications and help protect the life of overall sealing system from pressure surges.
Attributes: Cat® backup rings are designed in conjunction with the elastomeric seal and mating components to contribute significantly to the life and performance of the sealing system in high pressure applications. They may be solid or split depending on the application requirements.
Backup ring dimensions are consistently held to tight tolerances to ensure they properly bridge the seal groove and the mating surface. Materials are selected for their pressure and abrasion resistance.
Cat® sealing system uses a robust design, testing, and validation process. Buy the latest Genuine Cat® seal to protect your investment.
Applications: Backup rings are used in high pressure static and dynamic sealing applications, such as hydraulic pumps, valves and engine systems.
Warning:This product can expose you to chemicals including 1,3-Butadiene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Description: Backup rings prevent seal extrusion in high pressure applications and help protect the life of overall sealing system from pressure surges.
Attributes: Cat® backup rings are designed in conjunction with the elastomeric seal and mating components to contribute significantly to the life and performance of the sealing system in high pressure applications. They may be solid or split depending on the application requirements.
Backup ring dimensions are consistently held to tight tolerances to ensure they properly bridge the seal groove and the mating surface. Materials are selected for their pressure and abrasion resistance.
Cat® sealing system uses a robust design, testing, and validation process. Buy the latest Genuine Cat® seal to protect your investment.
Applications: Backup rings are used in high pressure static and dynamic sealing applications, such as hydraulic pumps, valves and engine systems.
Warning:This product can expose you to chemicals including 1,3-Butadiene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Specifications
Specifications
Units of MeasureUSMetric
Material: Nylon Plastic,Polyamide Plastic
Inside Diameter (mm): 70
Inside Diameter (in): 2.76
Material Description: Nylon Plastic provides good resistance to fuels, oils and lubricants. Many different formulations are used, some of which can support high mechanical loads, and perform well at elevated temperatures.
Axial Thickness (mm): 2
Cross Section Width (in): 0.07
Notes: Dimensions and Material Descriptions provided for reference only. Color may differ from image.
Description: Backup rings prevent seal extrusion in high pressure applications and help protect the life of overall sealing system from pressure surges.
Attributes: Cat® backup rings are designed in conjunction with the elastomeric seal and mating components to contribute significantly to the life and performance of the sealing system in high pressure applications. They may be solid or split depending on the application requirements.
Backup ring dimensions are consistently held to tight tolerances to ensure they properly bridge the seal groove and the mating surface. Materials are selected for their pressure and abrasion resistance.
Cat® sealing system uses a robust design, testing, and validation process. Buy the latest Genuine Cat® seal to protect your investment.
Applications: Backup rings are used in high pressure static and dynamic sealing applications, such as hydraulic pumps, valves and engine systems.
View More
Warning:This product can expose you to chemicals including 1,3-Butadiene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Specifications for part number 7Y-1257
Units of Measure
USMetric
Material: Nylon Plastic,Polyamide Plastic
Inside Diameter (mm): 70
Inside Diameter (in): 2.76
Material Description: Nylon Plastic provides good resistance to fuels, oils and lubricants. Many different formulations are used, some of which can support high mechanical loads, and perform well at elevated temperatures.
Axial Thickness (mm): 2
Cross Section Width (in): 0.07
Notes: Dimensions and Material Descriptions provided for reference only. Color may differ from image.
Cross Section Width (mm): 1.9
Cross Section Height (mm): 5
Seal/O-Ring Type: Split
Cross Section Height (in): 0.2
Radial Thickness (mm): 5
View More
Compatible Models for part number 7Y-1257
GENERATOR SET
3512B
UNDERCARRIAGE
OEMS
FORESTRY PRODUCTS
538
HEX BASED SPL SOLUTION
330F OEM
EXCAVATOR
330-A 330 L 324D FM LL 330-A L 329D LN 329F L 320D2 FM 329D L 325D L 323F SA FM538 320C 330-A L 320D 324D FM 330 LN 329E LN 320C FM 323E SA 320 330-A LN 330F 330D2 320D FM RR 330 GC 323 329E L 325C L 329D2 L 322C FM 320D FM 330B 323D SA 323D S 330 329D2 538 330D2 L 333 329D 330F L 329E 330B L 330F LN 330B LN 330GC 325C 325D
