Cummins 3960076 Fan Support Bracket Assembly

The fan support bracket 3960076 serves as the mounting structure for the engine cooling fan drive assembly. It is designed to maintain rigid positional accuracy of the fan relative to the radiator core and shroud, ensuring optimal airflow across the cooling package under high vibration operating conditions typical of hydraulic excavators. Constructed from cast aluminum alloy, the component offers a high strength-to-weight ratio and corrosion resistance. The casting process ensures complex geometry for multiple mounting points: engine block attachment, fan hub bearing housing, and belt tensioner provisions. This part corresponds to Cummins part number 4932910 and is a direct replacement for the fan drive support assembly on Komatsu 6D102 engines, which are licensed productions of the Cummins 6BT platform. Critical dimensional tolerances on the bearing bore and mounting flange faces are held to OEM specifications to prevent fan wobble, belt misalignment, and premature bearing failure. The bracket integrates the fan drive pulley shaft support and the belt tensioner pivot lug.