Part 441-149 Backup Ring is a rigid anti-extrusion device designed for use with O-rings in Hydra M and Hydra Pro Super series equipment. Installed on the low-pressure side of an O-ring, this backup ring prevents the O-ring from extruding into the clearance gap under high-pressure conditions. Replacing worn or damaged backup rings ensures proper O-ring function, extends seal life, and prevents catastrophic seal failure.
| Part Number | 441-149 |
|---|---|
| Part Description | Backup Ring (Anti-Extrusion Device) |
| Brand | Hydra |
| Fits | Hydra M, Hydra Pro Super |
| Condition | New |
The 441-149 Backup Ring is a rigid, split-ring component designed to support O-rings in high-pressure hydraulic and fluid systems on Hydra M and Hydra Pro Super equipment. When system pressure exceeds the O-ring material's ability to resist extrusion, the backup ring fills the gap on the low-pressure side, preventing the O-ring from being forced into the clearance and failing.
Without backup rings, O-rings in high-pressure applications can extrude into the metal-to-metal clearance, leading to rapid wear, nibbling, and eventual seal failure. Replacing worn or missing backup rings during routine maintenance ensures the O-ring remains properly contained and extends the life of the entire sealing system.
| Extrusion prevention | Blocks O-ring material from entering clearance gaps under pressure |
|---|---|
| O-ring support | Provides rigid backup to maintain O-ring position in the groove |
| Pressure handling | Enables O-rings to seal effectively at higher system pressures |
| Extended seal life | Reduces wear and nibbling on O-rings from pressure cycling |
| Cracks or breaks | Split ring is fractured or pieces missing |
|---|---|
| Deformation | Ring is bent, twisted, or no longer maintains its shape |
| O-ring extrusion | Evidence that O-ring has extruded past the backup ring |
| Routine maintenance | Replace whenever associated O-rings are serviced |
This backup ring is designed for use with specific O-ring sizes in Hydra M and Hydra Pro Super equipment. Always verify your equipment's parts diagram to ensure correct fit and application.
| Brand / Model | Component |
|---|---|
| Hydra M | Backup ring (for use with O-rings in high-pressure locations) |
| Hydra Pro Super | Backup ring (for use with O-rings in high-pressure locations) |
When servicing backup rings, these associated components are typically replaced at the same time.
Backup rings work in conjunction with O-rings; replace both whenever the seal is disassembled.
Many applications offer kits containing all O-rings and backup rings for a specific assembly.
Compatible lubricant prevents damage during installation of both O-rings and backup rings.
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