Excavator DH220 Ring Gear Product Introduction
The DH220 excavator ring gear is a core power transmission and structural component specially designed for Doosan/Daewoo DH220 series excavators (including key models such as DH220-2, DH220-3, DH220-5, and DH220LC-7).
Apr 20,2026
The DH220 excavator ring gear is a core power transmission and structural component specially designed for Doosan/Daewoo DH220 series excavators (including key models such as DH220-2, DH220-3, DH220-5, and DH220LC-7). As a key component of the excavator's swing mechanism and final drive system, it achieves torque transmission through meshing with the pinion gear, driving the 360° rotation of the upper body and the operation of the track. It is a core supporting component that ensures the excavator can efficiently and stably complete core operations such as excavation, rotation, and material transfer.
This ring gear is made of high-grade alloy steel (40CrNiMoA or 42CrMo) and undergoes multiple processing procedures including precision forging, carburizing, quenching, and tempering, with excellent comprehensive mechanical properties. The surface hardness of the gear teeth reaches HRC 58-62, which can effectively improve wear resistance and impact toughness; the core hardness is strictly controlled at HRC 28-32 to ensure that the structural toughness meets the standard. It can easily withstand high loads, alternating stresses, and frequent impacts generated during long-term heavy-duty operations under harsh working conditions such as mines, construction sites, and earthworks.
The gear teeth are precision machined by CNC hobbing and grinding equipment, with strict control over the accuracy of tooth profile, module, and pitch, ensuring tight meshing with the pinion gear, effectively reducing transmission noise, and eliminating abnormal phenomena such as tooth skipping and jamming. The ring gear is equipped with standard module and pitch diameter suitable for DH220 series models, the number of teeth is fully consistent with the original factory specifications, and it is provided with 22 or 30 mounting holes (the specific number depends on the model), which can realize precise alignment and installation with the excavator's slewing bearing or final drive assembly.
The surface of the ring gear is treated with phosphating, anti-rust coating, and shot blasting, which significantly improves corrosion resistance and wear resistance, and can effectively resist rust, oxidation, and wear caused by media such as hydraulic oil, moisture, dust, and gravel under harsh working conditions. The product strictly complies with the original factory dimensional specifications and ISO 6405:2018 industry standards, achieving perfect compatibility with the original components of the excavator, and can be directly interchanged without any structural modification to the equipment body.
As a key wearing component of the excavator's transmission system, the service life of the DH220 ring gear directly determines the equipment's operation efficiency, operational reliability, and operational safety. Its main fault characteristics include gear tooth wear, chipping, cracking, tooth surface pitting, and loose mounting holes. When such problems occur, the ring gear needs to be inspected and replaced in a timely manner to avoid serious damage to the pinion gear, swing motor, and final drive system, which may lead to equipment shutdown and high maintenance costs.
This DH220 ring gear is a brand-new ready-to-install component with a standard warranty period to ensure product quality and operational reliability. Compared with original parts, this ring gear has higher cost-effectiveness on the basis of maintaining equivalent performance, dimensional accuracy, and durability, making it the preferred solution for maintenance and replacement of Doosan/Daewoo DH220 series excavators. The product is widely used in various operating scenarios such as construction, mining, road construction, and landscaping, providing stable and efficient power transmission guarantee for the equipment.
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