2D2978 Spider A Fits Caterpillar ModelsOne New Aftermarket Replacement Spider A (Universal Joint) for Caterpillar (Cat) Motor Graders This Spider A is a universal joint cross assembly used in the driveline of Caterpillar motor graders. It transfers torque through the drivetrain while accommodating angular misalignment, making it a critical wear component in grading and road construction applications. This aftermarket replacement fits directly in place of Caterpillar OEM part number 2D2978
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