Swing Reduction Gearbox 451-2798 378-9557 451-2801 for E390F Excavator

This swing reduction gearbox, available under part numbers 451-2798, 378-9557, and 451-2801, is the swing transmission unit specially designed for the E390F excavator swing system. It reduces the output speed of the swing motor and increases torque to drive the upper structure to rotate. Built with a planetary gear structure, wear-resistant alloy gears, and precision machining, it offers direct replacement installation and stable torque output performance for heavy-duty mining and construction working conditions.

• Internal gear and bearing wear, resulting in insufficient swing torque and weak rotation.
• Internal oil seal damage, leading to hydraulic oil leakage.
• Abnormal impact noise and vibration during swing operation.
• Planet gear stuck, causing swing failure.
• Gearbox housing crack caused by overload and impact.

• Confirm the part number and machine serial number before ordering.
• Check gear ratio, mounting dimension, and spline specification.
• Request strict torque and load testing before shipment.
• Shockproof wooden packaging to avoid transit damage.
• Quality warranty covering manufacturing defects.