Kobelco SK115SR SK135 excavator Slewing Gearbox YY02-03001 YX32W00002F2

Construction & Key Components

The swing gearbox consists of several essential parts:

(A) Hydraulic Motor

• Converts hydraulic energy into mechanical rotation.

• Common types: Axial piston motors, gerotor motors.

(B) Planetary Gear System

• Sun gear: Driven by the motor.

• Planet gears: Rotate around the sun gear, mounted on a carrier.

• Ring gear: Stationary or rotating, depending on design.

• Provides high torque output while maintaining compact size.

(C) Slewing Bearing (Swing Ring)

• Large-diameter ball or roller bearing that supports the excavator’s rotation.

• Can be internal gear type (common in modern excavators) or external gear type.

(D) Brake System

• Hydraulic disc brake (common in modern excavators).

• Mechanical brake (used in older models).

• Prevents free rotation when the machine is idle.

(E) Housing & Seals

• Cast iron or steel housing for durability.

• Oil seals and gaskets prevent leakage and contamination.

GUANGZHOU BELPARTS ENGINEERING MACHINERY LIMITED founded in September 2013, loed in the engineering machinery market in Guangzhou, China. At present , we have one shop, one warehouse and one office as well as a professional team for purchasing, selling, packing, shipping and after-sale service.

Our main products are Excavator Hydraulic spare parts, Hydraulic pump, Swing motor, Travel motor, Final drive, Swing gearbox, Travel gearbox, Control valve,Monitor,Controller, Hydraulic cylinder and other hydraulic items with genuine and aftermarket quality. Until now, our products enjoy high reputation all over the world and have been exported to more than 150 countries and regions, spreading all over the Middle East, Southeast Asia, Africa, North America, South America, Europe and Oceania with its own brand "Belparts" are widely acclaimed by foreign customers.

In February 2023, Belparts Yunnan Tourism Team Building

In April 2024, Belparts participated in the Brazil Construction Machinery Exhibition and visited local clients in Brazil.

In April 2024, Belparts participated in the French Construction Machinery Exhibition and visited clients in France and Spain

In May 2024, Belparts Travel Thailand