0857572 Element Fits Caterpillar 330 330 L 330B L 330B LN W330BOne New Aftermarket Replacement Hydraulic Pump Coupling Insert Element Fits Caterpillar (Fits CAT) 330 Series Excavators This coupling insert element is a critical component of the hydraulic pump drive assembly on Fits Caterpillar 330 series excavators. The coupling element transmits power between the engine and the main hydraulic pump, absorbing vibration and torsional shock to protect both the engine and pump from damage. Worn or cracked coupling