This SD320 planetary spur gear is a core transmission spare part independently developed and manufactured by Shandong Hengji Group Co., Ltd., a national professional, sophisticated, distinctive and innovative enterprise and a single-item champion in Shandong’s machinery manufacturing industry. It is specially designed for the wheel reduction gearbox of SD320 bulldozers and widely compatible with heavy-duty construction machinery including large loaders, graders and engineering winches.
We adopt premium 42CrMo alloy forged steel as the raw material. Integral forging eliminates internal pores, cracks and other defects, offering far stronger bending resistance and impact toughness than ordinary 45# steel gears. The complete production workflow covers CNC rough turning, precision hobbing, carburizing quenching, low-temperature tempering, 6-class precision gear grinding, inner hole honing and magnetic particle non-destructive flaw detection. After heat treatment, the gear surface hardness reaches HRC 58-62 while the gear core maintains sufficient toughness, effectively avoiding tooth pitting, abrasion and tooth breakage under long-term heavy loads.
The 6-level precision grinding process minimizes tooth profile and pitch errors, greatly reducing transmission vibration and running noise by 30% compared with standard replacement gears. Its service life is increased by 45% under harsh mining and earthmoving working conditions, cutting customers’ downtime and maintenance costs significantly. All production links are finished in our self-owned forging, heat treatment and precision grinding workshops without outsourcing, which guarantees stable delivery cycles and consistent strict quality control for bulk OEM orders.
As a direct supplier of major domestic construction machinery brands such as Shantui, Sany, Zoomlion and Liugong, our planetary gears have obtained CE export certification and complete factory inspection reports. We provide a 12-month quality warranty for all products. Apart from standard SD320 gears, we also accept custom processing according to customers’ drawings or samples for non-standard gears of different modules and tooth counts.
Our gear products are exported in large quantities to Saudi Arabia, South Africa, Tanzania, Algeria, Russia, Southeast Asia and other global markets, winning consistent recognition from overseas engineering machinery dealers and maintenance service providers for reliable quality and competitive FOB factory prices. We support flexible MOQ and professional after-sales technical guidance for all international buyers.
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