The following are the relevant parameters of 2013 Sany SAC3500 crane:

- Equipment model: SAC3500
- Factory Date: 2013
- Engine Brand: Mercedes-Benz
- Rated power: 440 kW
- Emission standard: National Ⅳ
- Running time: 6754
- Length of main boom: 78 meters
- Jib length: 72 meters
- Maximum lifting capacity: 350 tons
- Counterweight: 150 tons
- Engine Model: OM502LA

Hunan Zhonggang Huitong Machinery Technology Co., Ltd  was established in 2016, specializing in the sales, export, repair, remanufacturing,  and technical support of used construction machinery. The company's main products include second-hand construction cranes, concrete  equipment, reach stackers, and aerial work platforms. It also handles the procurement, supply, and export of related spare parts, and offers  domestic sales financing services as well as export financing services.

Currently, the company has established a remanufacturing base in Changsha and a remanufacturing base in Wuxi, and through collaboration with well-known enterprises, has set up the China-Russia-Mongolia Trade Center in Manzhouli and an overseas warehouse in Dubai.

In 2023, the company was recognized as a governing unit of the Changsha Construction Machinery Association and has long been involved in the formulation, evaluation, and compilation of standards for used construction machinery in China's domestic industry.

The company has significant influence in the export of used construction cranes and has ranked among the top domestic exporters of medium and large-tonnage used products for two consecutive years. In 2023, the company secured an order for the export of a 1,600-ton used mobile crane, setting a new record for the largest tonnage of exported used mobile cranes in China.

Currently, the company has 39 employees (including registered and labor personnel), with 10 management staff, 6 technical engineers, 8 sales staff, and 15 maintenance engineers. Among them, the management, technical engineers, and sales personnel all have experience working at Zoomlion and Sany Heavy Industry, possessing professional management, technical, and international trade capabilities. As business continues to grow and international market demands evolve, the company plans to increase overseas technical personnel in 2024 to further enhance after-sales support through its overseas channels.