High Quality Used Bulldozers

Comprehensive Deep Refurbishment, Surpassing Expectations

Adhering to the international construction machinery refurbishment standard (ISO 10987), we have established a seven-step refurbishment process system to breathe new life into the equipment.

• Disassembly and Inspection: Non-destructive testing of key structural components such as the chassis frame and vehicle frame is conducted using ultrasonic flaw detectors with an accuracy of 0.1mm. Any components with potential cracks or deformations are eliminated. Professional engine endoscopes are used to inspect the wear of internal parts like pistons and valves, and detailed inspection data records are created.

• Component Repair and Replacement: 100% of core components are replaced with brand-new original parts. The engine is upgraded to the Weichai WP6/WP10 series National II engines, which apply advanced high-pressure common rail fuel injection technology for stable and powerful power output. Hydraulic pumps are uniformly replaced with new products from renowned brands such as Parker or Rexroth. Combined with new seals, the system pressure loss is reduced by 12%. The tracks are made of high-hardness alloy steel, with a chain link hardness of HRC58, increasing wear resistance by 40%.

• Machine Assembly and Debugging: The laser alignment instrument is used to precisely align the transmission system, with an error controlled within 0.05mm. The hydraulic system is pressure-tested on a professional hydraulic test bench to ensure that the pressure fluctuation range of each pipeline is less than ±0.5MPa. After the assembly is completed, the machine undergoes a continuous 150-hour simulated working condition test, covering scenarios such as high-load bulldozing and complex terrain traversal, comprehensively verifying the performance stability of the equipment.

(2) National II Engine, Adaptable to Diverse Market Demands

The mechanical fuel injection system is resistant to dust. In dusty environments like the Sahara Desert, the failure probability is 60% lower compared to electronically controlled injection engines. It has excellent high-temperature resistance and can operate stably in an environment of 50°C, easily coping with extreme climates in Africa, Southeast Asia, and other regions. With lenient requirements for fuel quality, it can adapt to local low-grade diesel. Equipped with an efficient fuel filter, it effectively filters impurities, extending the engine's service life and reducing comprehensive maintenance costs by 35%. Moreover, its emissions meet the National II/Stage II standards in Africa, Southeast Asia, and other regions, easily complying with the environmental regulations of countries like Nigeria, Thailand, and Myanmar.

(3) Ultra-High Cost-Effectiveness, Multiplied Investment Returns

Priced at only 40% - 60% of a new machine, it significantly reduces procurement costs. Thanks to the deep refurbishment process, the equipment's service life is extended to 8 - 10 years, and the average annual usage cost is 45% lower than that of similar used equipment. We provide a refurbishment quality certification report issued by an authoritative third party, which includes detailed component replacement lists and performance test data, eliminating your concerns about the quality of used equipment and increasing the return on investment by over 60%.

II. Basic Parameters (Taking SD16/SD22 as Examples)

III. Refurbishment Details and Configuration Upgrades

(1) Power System: Revitalized Core, Strong and Durable

• Engine: The brand-new Weichai National II engine adopts advanced turbocharging and intercooling technology, increasing air intake efficiency by 25% for more complete combustion and improving fuel economy by 18%. The optimized piston ring design, combined with high-precision cylinder liners, effectively reduces oil consumption, extending the oil change interval to 500 hours. It is standard-equipped with a dual-stage air filter. The primary filter can remove more than 90% of large dust particles, and the main filter further improves the filtration accuracy to 3μm, providing comprehensive protection for the engine.

• Cooling System: The radiator area is increased by 30%, and a new aluminum alloy material is used, improving heat dissipation efficiency by 22%. An intelligent temperature-controlled fan is installed, which can automatically adjust the speed according to the engine temperature, reducing energy consumption. The coolant circulation path is optimized to ensure that the engine's water temperature remains within the normal working range during continuous high-intensity operation.

• Fuel System: The interior of the fuel tank undergoes professional cleaning and anti-corrosion treatment, with a coating thickness of 0.3mm to prevent fuel oxidation and impurity deposition. A high-precision Bosch fuel pump is installed, increasing the injection pressure to 160MPa for better atomization and significantly improving combustion efficiency.

(2) Hydraulic System: Precise, Efficient, and Reliable

• Hydraulic Pumps and Valve Sets: New Parker variable displacement piston pumps are adopted, featuring intelligent load-sensitive control functions. They can automatically adjust the flow and pressure according to the operating requirements, with remarkable energy-saving effects. The main control valves are upgraded to load-sensitive proportional valves, improving control accuracy by 30%. The blade lifting and tilting actions respond more quickly and operate more smoothly.

• Pipelines and Seals: All hydraulic pipelines are replaced with high-pressure wire-braided rubber hoses, increasing the pressure resistance level to 40MPa and enhancing explosion resistance. Imported fluororubber seals are selected, with a temperature resistance range of -40°C - 200°C, effectively preventing hydraulic oil leakage and ensuring the stable operation of the system.

• Hydraulic Oil Treatment: A three-stage filtration system is used for deep purification of hydraulic oil, achieving a cleanliness level of ISO 16/14. High-performance anti-wear hydraulic oil is added, containing various additives that can effectively reduce the wear of hydraulic components and extend the service life of the system.

(3) Chassis System: Sturdy and Durable, Adaptable to All Terrains

• Chassis Structure: The frame is made of high-strength low-alloy steel plates (yield strength ≥550MPa). Through thickening (an 8mm increase in thickness) and reinforced welding processes, triangular stiffeners are added to key parts, increasing the overall torsional strength by 35%. High-strength bolts (grade 10.9) and lock washers are used at the frame joints to ensure a firm connection.

• Traveling Components: The track plates adopt a split design for easy replacement. The chain links undergo quenching and tempering treatment, with a surface hardness of HRC58 and good internal toughness, and a tensile strength ≥1200MPa. The carrier rollers and idler wheels adopt a bimetallic bushing + sealed bearing structure, with excellent waterproof and dustproof performance, extending the service life to 6000 hours. The tensioning device is upgraded to a hydraulic automatic tensioning system, which can automatically adjust the track tension according to different working conditions, improving traveling stability and track life.

(4) Electrical System: Smart Upgrades, Safe and Convenient

• Circuit Modification: The entire vehicle wiring harness is redesigned, using high-temperature resistant and flame-retardant cross-linked irradiated cables with an IP67 protection level. The circuit layout is optimized to reduce wire crossing and tangling, minimizing the risk of short circuits. Overload protection devices and intelligent relays are installed to improve the reliability of the electrical system.

• Lighting and Display: LED work lights are equipped, with a 50% increase in brightness and an illumination distance of up to 50 meters, ensuring clear visibility during night operations. The instrument panel is upgraded to a color liquid crystal display, which can display more than 20 key data in real-time, such as engine speed, oil pressure, water temperature, and hydraulic system pressure. It supports self-diagnosis of fault codes, facilitating quick problem troubleshooting.

• Smart Configurations: An optional GPS remote monitoring system supports functions such as equipment positioning, working hours statistics, and fuel consumption monitoring. You can real-time monitor the equipment's operating status through a mobile APP or computer. An electronic anti-theft system is installed to effectively prevent the equipment from being stolen.

(5) Cab: Comfortable, Intelligent, and User-Centric

• Structural Reinforcement: The cab frame is welded with high-strength steel and meets the ROPS (Rollover Protective Structure) and FOPS (Falling Object Protective Structure) standards, providing safety protection for the operator. Shock-absorbing rubber blocks are installed, effectively isolating vibrations from the chassis, with a vibration attenuation rate of 70%.

• Comfort Enhancement: A full-floating shock-absorbing seat is equipped, supporting multi-directional adjustments such as front-back, height, and backrest angle. Combined with the lumbar support function, it effectively relieves fatigue during long hours of operation. The interior of the cab uses environmentally friendly noise-reducing materials, with the noise level controlled within 75dB. A high-power heating and cooling air conditioner is installed, with a cooling capacity of 5kW and a heating capacity of 4kW, which can quickly adjust the indoor temperature, creating a comfortable working environment.

• Operational Convenience: The operation handles are designed ergonomically, with a comfortable grip and a 20% reduction in operating force. The instrument panel and control buttons are reasonably arranged for easy access. Facilities such as a Bluetooth audio system and USB charging ports are provided to meet the operator's entertainment and communication needs.

IV. Target Markets and Application Scenarios

(1) African Mining Industry

In gold mining operations in South Africa, the SD22 model, equipped with a 5.0m³ rock bucket, can efficiently transport 15,000m³ of ore per day, thanks to its 220HP power and sturdy chassis. In the complex terrains of copper mines in the Democratic Republic of the Congo, the strengthened chassis and highly wear-resistant tracks reduce the equipment failure rate by 70%, effectively ensuring the progress of mining operations.

(2) Southeast Asian Agriculture

In rubber plantation land reclamation projects in Thailand, the low ground pressure (62kPa) design of the SD16 model minimizes damage to the soil structure. With a 220HP engine and an efficient hydraulic system, it can reclaim 25 hectares of land per day, contributing to the large-scale development of agriculture. In Vietnam's farmland water conservancy projects, the precise blade control enables efficient excavation and leveling of irrigation canals.

(3) Middle East Infrastructure Construction

In Saudi Arabian road construction projects, the SD22 bulldozer can achieve a blade flatness control accuracy of ±2cm, meeting high-standard construction requirements. In site leveling operations of municipal projects in the United Arab Emirates, the intelligent hydraulic system and comfortable cab significantly improve construction efficiency and the operator's working experience.

V. After-Sales and Trade Guarantees

(1) Warranty Service

The entire machine comes with a 6-month warranty, and core components (engine, hydraulic pump, chassis frame, etc.) are covered by a 12-month warranty. We have established more than 50 after-sales service outlets in major markets in Africa and Southeast Asia. Our professional technical team is on standby 24/7 and will respond to after-sales requests within 48 hours to ensure that equipment failures are resolved promptly.

(2) Supply Chain Support

Large-scale parts centers have been established in cities such as Dubai, Bangkok, and Johannesburg, stocking over 2,000 common parts with an inventory turnover rate of 98%. We provide fast parts delivery services, and urgent parts can be delivered within 24 hours via air freight. Our "trade-in" service allows old machines to offset up to 35% of the cost of new machines after professional assessment, reducing the cost of equipment upgrades.

(3) Export Services

Our professional international trade team is proficient in global trade rules and customs policies of various countries. We can handle customs clearance documents such as CE, PVOC, and COC to ensure smooth customs clearance of the equipment. We support various trade terms such as EXW, FOB, CIF, DDP, and DAP, and provide one-stop "door-to-door" logistics solutions. The equipment is fully insured during transportation to ensure its safety. For customers from different countries, we provide multilingual operation manuals, training videos, and other materials, and can arrange on-site technical personnel for operation training and equipment commissioning.