EC210B Final Reduction Gear Swing Gearbox Assembly Swing Drive Reducer Excavator Spare Parts

High-Torque Planetary Gearing and Precision Rotation Control: Engineered with advanced planetary gear geometry and precision-machined internal components, our swing gearbox ensures seamless power transmission with minimal backlash. This allows operators to achieve pinpoint positioning and smoother swing cycles, directly eliminating jerky machine movements and increasing daily excavation productivity. Reinforced Alloy Steel Construction and Extreme Wear Resistance: Crafted from high-strength, heat-treated alloy steel and utilizing premium internal bearings, this gearbox is built to withstand the intense radial and axial loads of continuous digging cycles. By offering superior structural durability compared to standard aftermarket parts, it drastically reduces internal friction and heat buildup, effectively preventing premature gear failure and lowering long-term maintenance costs.

The swing reducer of an excavator (commonly known as the swing gearbox) is a key transmission component connecting the slewing motor to the slewing large gear ring. Its core function is to reduce speed and increase torque, driving the upper structure to rotate smoothly by 360°.

Core Structure
• Sun gear: Splined to the slewing motor to input high-speed power.
• Planet gear: 3 to 4 pieces per stage, rotates both revolutionally around the sun gear and rotationally on its own axis to transmit torque.
• Ring gear: Fixed to the housing and meshes with the planet gears.
• Planet carrier: Outputs power and drives the lower pinion (drive gear).
• Brake: Built-in wet multi-disc brake; spring-applied braking and hydraulic release to prevent slewing runaway.
• Housing and bearing: High-strength cast steel / forged steel housing, supported by heavy-duty bearings, with dustproof and leakproof performance.

Working Principle

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