SANY SY245 SY265 ExcavatorsSwing Gearbox / Swing Reduction Gear GS14D20C-G1H1N 13881691

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SANY SY245 SY265 ExcavatorsSwing Gearbox / Swing Reduction Gear GS14D20C-G1H1N 13881691

Core Functions
1. Multi-stage planetary reduction: The slewing hydraulic motor outputs high-speed, low-torque power; the reducer converts this into an ultra-low-speed, high-torque output through a complex internal system of high-strength, multi-stage planetary gears.
2. Driving the slewing mechanism: The output gear at the bottom of the reducer meshes with the slewing bearing on the excavator's undercarriage, thereby driving the upper structure to rotate smoothly through a full 360 degrees.

Common Failure Modes and Maintenance Essentials

1. Gear Oil Deterioration and Low Oil Levels: The swing reduction gear contains specialized heavy-duty gear oil. Failure to change the oil over extended periods leads to an accumulation of metal filings, while a damaged bottom oil seal can cause the oil to leak out completely; either scenario can result in the immediate burnout of internal planetary gears and bearings.
2. Swing Vibration and Abnormal Noise: Violent shaking of the upper structure during excavation or material dumping, or continuous metallic clanking sounds during rotation, typically indicate a fractured internal planet carrier, disintegrated bearings, or stripped teeth on the output shaft gear.

Core Mechanical Structure and Transmission Logic
1. Reduction Matrix (Multi-stage Planetary Gear Sets): The assembly comprises a sun gear, multiple planet gears, and a stationary internal ring gear. By utilizing the principle of planet gears orbiting the sun gear, it achieves reduction ratios ranging from several dozen to over a hundredfold within a highly compact space.
2. Dual Floating Oil Seals: Heavy-duty, long-life metal floating oil seals are employed at the interface between the bottom output shaft and the flange. These effectively prevent external contaminants-such as mud, water, sand, and dust-from entering the reducer while simultaneously preventing internal gear oil leakage.

DETAILS

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