DYR Style Hydraulic Buffer Seal — Urethane 90A Durometer
Engineered for demanding Caterpillar hydraulic cylinder applications, this DYR style buffer seal delivers superior shock absorption and pressure spike protection. Manufactured from premium 90A durometer urethane, it provides exceptional wear resistance, extrusion resistance, and long service life even under high-cycle, high-pressure conditions.
Key Features
Material: Urethane (Polyurethane) — 90A Shore A Durometer
Style: DYR (Buffer/Wiper combination profile)
Function: Absorbs hydraulic pressure spikes and protects primary seals from shock loads
Application: Caterpillar hydraulic cylinders — construction, mining, and heavy equipment
Temperature Range: -40°F to +212°F (-40°C to +100°C)
Pressure Rating: Suitable for high-pressure hydraulic systems
Fluid Compatibility: Compatible with petroleum-based hydraulic fluids, water-glycol, and water-in-oil emulsions
Why Urethane 90A?
90A durometer urethane strikes the ideal balance between flexibility and hardness — firm enough to resist extrusion under pressure spikes, yet compliant enough to maintain a reliable dynamic seal. The result is a buffer seal that outlasts standard rubber alternatives in high-load, high-cycle environments.
Fits Caterpillar Equipment Including
Excavators
Bulldozers
Motor Graders
Wheel Loaders
Backhoe Loaders
Sold individually. Verify bore diameter, rod diameter, and groove dimensions before ordering to ensure proper fit.
