Caterpillar Inc. 4J-3236 Wear Ring

The Caterpillar 4J-3236 Wear Ring is a piston-protective O-ring (Cat part 4J-3236) used inside Cat hydraulic cylinder assemblies to seal the piston bore and minimize wear between the piston and bore. On Caterpillar's official parts platform, the part is listed as 4J-3236 with the description Ochranný O-kroužek pístu, confirming it as a genuine Cat seal element designed for piston/seal applications in hydraulic cylinders. As an OEM Cat component, it is intended to perform under the typical operating pressures and temperatures of Cat hydraulic systems, helping to maintain hydraulic integrity and extend the life of adjacent piston and bore surfaces. This authentic Cat part provides a direct replacement option for technicians performing maintenance on Cat machinery, ensuring compatibility with Cat cylinder designs and avoiding variability from aftermarket substitutes. Because it is a genuine Cat component, it supports consistent performance and a reliable fit with Cat hydraulic cylinder components, making it a preferred choice for service shops prioritizing OEM integrity.