Hunan Zhonggang Huitong Machinery Technology Co., Ltd.

Focus on construction machinery equipment professional services Global customers

Hunan Zhonggang provides remanufacturing and ODM services for used construction machinery. The company conducts comprehensive inspections, upgrades, and remanufacturing of reclaimed used equipment. Based on clients' specific requirements, equipment can be customized, including replacement of specific working components, adjustment of engine performance parameters, and control system upgrades. Hunan Zhonggang's remanufactured equipment offers performance and reliability close to that of new machines, while being more cost-effective, meeting diverse customer needs for personalized used construction machinery.

We perform professional evaluations and repairs of used equipment, modifying and optimizing it based on clients’ project requirements and working environments. For example, we offer customized track systems for clients working on specific terrains or adjust hydraulic system parameters for particular engineering tasks. Leveraging our strong technical expertise and comprehensive after-sales service system, we deliver high-quality customized solutions for used construction machinery.

1. Acquisition and Inspection

Acquisition Sources:
Used construction machinery is acquired from sources such as construction companies, rental firms, and individual owners. These machines are typically sold due to project completion, equipment upgrades, or cash flow needs.
Initial Inspection:

Visual Inspection: Check for visible damage, deformation, corrosion, etc., across parts like the body, cab, and working components.
Equipment Verification: Verify details like model, manufacturing year, operating hours, and usage history to ensure they match the seller’s records.
Startup Check: Test equipment startup to assess the functionality of the engine, hydraulic system, electrical system, etc. Listen for irregular engine sounds and check for any warning lights on the dashboard.

2. Disassembly and Cleaning

Disassembly:
Disassemble parts requiring repair or replacement, breaking down the equipment into components such as the engine, hydraulic pump, control valves, and working devices.
Mark and document each part to ensure accurate reassembly.

Cleaning:
Clean disassembled components to remove dirt, grease, and rust using methods like high-pressure washing, chemical soaking, and ultrasonic cleaning.
Dry all cleaned parts to prevent rust and corrosion.

3. Repair and Replacement

Component Inspection:
Inspect cleaned components thoroughly to identify those needing repair or replacement through methods like visual inspection, dimension measurement, and performance testing.
Use specialized testing equipment, such as engine analyzers and hydraulic testers, to confirm that critical parts like engines and hydraulic systems meet performance standards.

Repair and Replacement:
Repair or replace damaged parts as needed, using methods such as welding, machining, and refurbishing. Replacement parts should meet quality and compliance standards.
Strictly follow operating procedures during repairs and replacements to ensure accurate and secure installation.

4. Assembly and Testing

Assembly:
Reassemble repaired or replaced components according to markings and documentation, paying close attention to the order and positioning of parts.
Use professional tools and equipment to ensure tight, secure, and sealed connections.

Testing:
After assembly, conduct testing on the equipment, including engine startup, hydraulic system checks, electrical system testing, and functional checks of working devices.
Verify that performance indicators-such as engine power, hydraulic pressure, and functionality of working devices-meet requirements. Address any issues through adjustments or repairs.

5. Quality Inspection and Certification

Quality Inspection:
Conduct a comprehensive quality check on the equipment post-testing, covering appearance, performance metrics, and safety features.
Use professional testing equipment and methods-such as lifting performance tests for cranes, digging force tests for excavators, and load capacity tests for loaders to ensure the equipment meets quality standards.

Certification and Labeling:
Qualifying used construction equipment can be issued relevant certifications and labels, such as quality certification, environmental labels, and safety labels.
Certification and labeling enhance equipment credibility and marketability, providing buyers with confidence in purchasing and using used machinery.

6. Packaging and Transportation

Transportation:
Select suitable transportation methods, such as road, rail, or sea, to deliver the used construction equipment to its destination.
Secure and protect equipment during transport to prevent movement or tilting. Adhere to transport regulations and safety guidelines to ensure safe, reliable delivery.

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.

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.

Specialized in the sales, export, maintenance, remanufacturing, and technical support of used construction machinery. Our main products include used construction cranes, concrete equipment, reach stackers, and aerial work platforms. We also handle the procurement, supply, and export of spare parts for related products, and can provide domestic sales financing services as well as export financing solutions.