CATERPILLAR 123-6383 Switch AS-Rotary 1236383

Caterpillar 126-1978 Ring-Back Up Seal – OEM-Grade Durability for Excavator Hydraulic Systems

The Caterpillar 126-1978 Ring-Back Up is a precision-engineered sealing component designed specifically for a wide range of Caterpillar excavators, including models such as TBA-345C, PAS-374D L, AKJ-345B II, DER-365B II, and many others. Manufactured to meet stringent OEM specifications, this ring-back up seal ensures optimal sealing performance under high-pressure hydraulic conditions. Crafted from advanced elastomeric materials combined with reinforced back-up rings, it provides exceptional resistance to extrusion, wear, and thermal degradation, essential for maintaining the integrity of the drivetrain and hydraulic cylinders.

This ring-back up seal features a robust design that supports high load conditions and dynamic movements typical in heavy-duty excavator operations. Its metallurgy and polymer composition are optimized for compatibility with hydraulic fluids, ensuring long service life and minimal maintenance downtime. The precise dimensions and tolerances guarantee a perfect fit within the hydraulic assembly, preventing fluid leaks and enhancing overall machine efficiency. Ideal for use in models such as the MCY-365C L, MFL-374F L, and WAW-385C L MH excavators, the 126-1978 seal is a critical component for maintaining peak operational performance and reliability in demanding construction environments.

For authentic Caterpillar spare parts that deliver superior durability and performance, explore the full product details and secure your 126-1978 Ring-Back Up seal here: 🔗 Caterpillar 126-1978 Ring-Back Up Seal at AllParts Expert. Ensure your excavator’s hydraulic systems operate flawlessly with this essential OEM-grade replacement part.