Keep your Kubota mini excavator's hydraulic thumb operating smoothly with this high-quality 40mm Greasable Main Thumb Pin. Designed as a direct replacement for models including the KX033-4, KX040-4, KX71, KX91, KX121, and U35, this pin is built to withstand the high-stress pivoting forces of digging and material handling. Constructed from tough, heat-treated steel, it resists bending and shear forces. The integrated grease fitting is the key feature, allowing for easy maintenance to purge dirt and moisture while forming a protective lubricant layer. This prevents the most common failure mode—seizure within the mounting bosses—which can lead to difficult disassembly and damage to other components. Installing this pin ensures reliable thumb movement, reduces long-term wear, and is a cost-effective solution for restoring peak performance to your attachment.
