981733
O-Ring
Volvo

Within hydraulic and fuel systems, a flexible elastomer ring formed with precise cross-section and compression characteristics provides a critical seal at interfaces and through dynamic movement. It is designed to resist high temperatures, fluids, and pressure cycling common in heavy-duty trucks, ensuring containment and preventing leaks that could compromise lubrication, cooling, or braking performance. Correct sizing and installation orientation prevent twist and roll under vibration, while proper lubing and seating avoid extruded or pinched configurations. The material choice balances chemical compatibility with gas permeability to minimize leakage and aging effects across service intervals. In routine operation, this sealing element reduces maintenance cost by extending service intervals and protecting sensitive sensors and actuators from contamination. In faulty conditions, leaks can allow ingress of air or contaminants, leading to reduced system efficiency, loss of pressure, erratic instrument readings, and potential safety concerns. Replacement with a new seal of the correct profile and hardness restores integrity, prevents multi-system failures, and supports consistent performance, reliability, and safety under load, climate, and duty-cycle variations.