This SD320 planetary gear is a core transmission component specially designed for heavy-duty construction machinery by Shandong Hengji, and also an OEM-level replacement part compatible with Shantui SD32/SD320 series bulldozers. Made of high-strength alloy structural steel, it undergoes carburizing quenching and low-temperature tempering, achieving a tooth surface hardness of HRC 58-62 with excellent core toughness, enabling it to withstand heavy loads and impact loads in harsh working conditions such as mines and infrastructure projects for a long time.
In production, we use imported CNC gear hobbing and grinding equipment, with tooth profile accuracy up to ISO 5 and tooth surface roughness as low as Ra0.8μm. The uniform meshing clearance ensures a transmission efficiency of over 98%, which can greatly reduce operating noise and vibration and improve the overall stability of the gearbox. The tooth root fillet reinforcement design avoids stress concentration, and the high-precision honing treatment of the inner hole ensures a tight fit with the shaft parts, making installation convenient without secondary processing.
Each product has passed non-destructive testing, hardness testing, metallographic analysis and meshing testing, 100% in line with the original technical standards, effectively eliminating failures such as broken teeth, pitting and early wear, with a service life far exceeding that of ordinary replacement parts. As a direct supply product from the source factory, it supports bulk customization and OEM processing, and can provide you with complete factory inspection reports and quality assurance, making it a reliable choice for bulldozer gearbox maintenance.
