Product description

The Snap-On JBC61634000 Backup Ring, corresponding to Parker #8-240, is a critical anti-extrusion component used in conjunction with O-rings in high-pressure hydraulic systems. While the O-ring provides the primary seal, the backup ring is installed behind it to prevent the softer O-ring material from being forced (extruded) into the clearance gaps between moving parts under extreme pressure. This is particularly important in the high-tonnage lifting cylinders of John Bean and Snap-On vehicle lifts, where hydraulic pressures can reach levels that would otherwise damage a standard seal. By providing structural support to the primary seal, the backup ring significantly increases the pressure rating and lifespan of the hydraulic assembly. Using this precise Parker-spec replacement ensures that your equipment maintains its original design safety margins and continues to operate reliably under the heavy loads encountered in a professional automotive bay.

Product highlights

• Anti-Extrusion Design: Prevents O-ring damage and failure by bridging clearance gaps in high-pressure applications.
• Parker #8-240 Standard: Manufactured to industry-recognized specifications for guaranteed performance and fitment.
• Increased Seal Life: Protects the primary O-ring from mechanical deformation, extending the interval between repairs.
• High-Pressure Ready: Essential for hydraulic systems where peak pressures exceed the limits of unsupported elastomeric seals.
• Reliable Material: Constructed from rigid, wear-resistant materials designed for the demanding conditions of hydraulic cylinders.

Specs

• Component Type: Backup Ring
• Standard Cross-Ref: Parker #8-240
• Manufacturer: Snap-On
• Manufacturer Part Number: jbc61634000
• Country of Manufacture: USA

Direct replacement models

Snap-On JBC61634000, John Bean 61634000, Parker 8-240

You will receive the same product or an OEM-Equivalent that meets the highest standard of the OEM with warranty that will be a direct-fit. Manufactured with rigorous industry standards and certified in the USA with superior quality to the OEM.