Caterpillar 5J-3570 Hydraulic Spool Valve Stem

Caterpillar 5J-3570 Hydraulic Spool Valve Stem is an original Caterpillar replacement part built for use in hydraulic spool valve assemblies. As the moving element inside the valve body, the stem translates control inputs into the precise spool travel that directs hydraulic fluid to the appropriate ports, enabling operation of Cat hydraulic circuits. The 5J-3570 designation identifies the stem for Caterpillar valve configurations; to ensure a correct fit, verify the stem part number against the valve body you are servicing and align it with the corresponding valve assembly. Being an OEM part, it is manufactured to Caterpillar’s specifications to maintain the original performance characteristics of hydraulic systems replaced due to wear or damage. Typical applications include control of Caterpillar hydraulic functions where reliable, repeatable spool actuation is required in machines such as loaders, excavators, and other CAT equipment that rely on precise metering of hydraulic flow. Replacing a worn stem with an OEM 5J-3570 helps restore valve feel and response and preserves compatibility with Cat seals and valve bodies.