When it comes to road construction with bulldozers, choosing the right equipment is crucial and successful project. Among the various alternatives, the SD22 bulldozer stands out as the most powerful competitor. This paper will discuss in depth what makes the SD22 the first choice for many building professionals, including its unique advantages, product specifications and main application scenarios.
What is the SD22 bulldozer?
SD22 is a mountain-pushing bulldozer, which is specially designed for heavy-duty operations, especially in the field of road construction. It is famous for its solid structure, high efficiency and versatility, making it suitable for a wide range of applications. SD22 is part of the road construction machinery category, specifically belonging to bulldozer product line.
Unique advantage of SD-22 bulldozer
1.Strong engine performance
SD22 is equipped with Wei Chai’s WP 10 g 220 e 34 national iii engine, with rated power of 162 kW (220 HP) and a maximum torque of 950n m (1200-1500r/min). Laboratory tests have shown that its fuel consumption during earthmoving operations is ≤ 22 l/h, which is lower than the industry average of 25 l/h for similar-sized machines. The power output stability is also impressive, the voltage fluctuation is ≤ 1.5 V, and it can run continuously for 72 hours at full load without failure.
2.High operational Efficiency
The standard bulldozer blade capacity of the SD22 is 5.6 me, and there is an enlarged version that can reach 6.3 me. It has a maximum bulldozing force of 320 kN, making it highly effective in various soil conditions. In real-world tests, it has achieved an operational efficiency of ≥ 800 me/h for loose soil (with a soil density of 1.6 t/me) and ≥ 550 me/h for hard soil. Its climbing ability is also worth noting. It can climb 200 m continuously with an inclination of 35 when it is unloaded and 30 when it is fully loaded, and its power attenuation is less than or equal to 3.
3.Accurate control and maneuverability
SD22 adopts electro-hydraulic proportional gearbox, with 4 forward gears and 4 reverse gears, and the shift response time is less than 0.6 seconds. The minimum turning radius of its steering system is 5.2 meters, ensuring excellent maneuverability in a narrow spaces. The straight-line driving deviation is ≤ 30 mm/100 m, and the site leveling error is ≤ 20 mm/1000 m, making it highly suitable for high-precision roadbed repair work.
4.Unrivaled Durability and Reduced Long-Term Costs
SD22 is designed to be durable. Its track pads are crafted from NM 500 abrasion-resistant steel. Laboratory-accelerated wear tests indicate that these track pads can last up to 8,000 hours, marking a 60% increase in service life compared to standard materials (source:https://www.shantui-global.com/product/pro-detail-179.htm). This extended service life directly leads to the reduction of maintenance costs and the reduction of work interruption. According to the life-cycle cost analysis, compared with the main competitors, the total cost of ownership of Shantui SD22 bulldozer is less than 10,000 hours.
Product Specifications of the SD22 Bulldozer
| Specification | Details |
| Engine Model | Weichai WP10G220E34 Nationa lIII |
| Rated Power | 162kW (220 horsepower) |
| Maximum Torque | 950N·m (1200-1500r/min) |
| Fuel Consumption (Earthmoving) | ≤22L/h |
| Blade Capacity | Standard: 5.6m³; Enlarged: 6.3m³ |
| Maximum Bulldozing Force | 320kN |
| Operational Efficiency (Loose Soil) | ≥800m³/h |
| Operational Efficiency (Hard Soil) | ≥550m³/h |
| Climbing Ability (Empty) | 35° |
| Climbing Ability (Loaded) | 30° |
| Minimum Turning Radius | 5.2m |
| Straight-Line Driving Deviation | ≤30mm/100m |
| Site Leveling Error | ≤20mm/1000m |
| Track Plate Material | NM500 wear-resistant steel |
| Track Plate Service Life | 8000 hours |
| Hydraulic System Pressure | 25MPa |
| Hydraulic System Leakage | ≤0.05mL/min (after 2000 hours) |
Major application occasions
1.Mining stripping and coal mining
SD22 is widely used in mine stripping and coal mining, accounting for 45% of its applications. It is especially effective in tasks such as topsoil stripping, slag pushing and slag discharge, and coal seam roof cleaning. For example, Shendong Coal Mine in Shenhua, China faces the challenge of dealing with hard rock and soil, which needs to deal with 12,000 cubic meters per day. After switching to the SD22, they achieved a significant improvement in efficiency and reduced downtime.
2.Large scale water conservancy infrastructure construction
Another major application field of SD22 is large-scale water conservancy infrastructure projects, accounting for 30% of its usage. It is used for river excavation, dam construction and reservoir dredging. The Egypt New Suez Canal project is a notable example where the SD22 played a crucial role in ensuring the smooth progress of the construction work.
3.Road and rail infrastructure
SD22 is also widely used in highway and railway infrastructure projects, accounting for 25% of its applications. It is ideal equipment for subgrade leveling, earthwork transportation and slope repair. The China Railway Shanghai-Kunming High-Speed Rail Project is a prime example of how the SD22 has contributed to the successful completion of such large-scale infrastructure projects.
Core component technology
1.Electro-Hydraulic Proportional Gearbox
The electro-hydraulic proportional gearbox of the SD22 adopts a planetary transmission structure, which is controlled by an electro-hydraulic proportional valve to realize seamless shifting without power interruption. It has an intelligent temperature control lubrication system, which can automatically adjusts the lubrication intensity according to the oil temperature, ensuring the friction plate to work in the temperature range of 80-120℃ and prevent high temperature burning.
2.Bulldozer blade and ripper
The blade of the SD22 bulldozer is a box-type welded structure, and the wear-resistant gasket of NM 500 is added at the key position to provide 350 j impact resistance. The cylinder diameter of the double-acting hydraulic cylinder is 160 mm, a rod diameter is 100 mm, the maximum stroke is 800 mm, and the lifting speed is ≥ 0.5 m/s. The optional 3-tooth heavy-duty ripper can achieve a maximum depth of 600 mm, and the breaking force of single tooth is ≥ 450 kN. The tooth tip is inlaid with tungsten alloy (≥ 93%), with a hardness of HRC 90 and a service life of 6000 hours.
3.Crawler traveling system
The crawler system of the SD22 adopts a balanced supporting structure consisting of driving wheels, guide wheels and 24 supporting wheels, which provides a ground pressure of 48 kPa (soft ground subsidence ≤ 50 mm). The track tensioning device adopts hydraulic automatic tensioning, and the tensioning force is 120 kN. Combined with buffer springs, it absorbs the impact load to prevent track from loosening and derailment.
Common problems
Q 1:When the bulldozer is working, the power drops suddenly, accompanied by abnormal engine noise. How to remove the fault?
A :1.Check the air filter (if it is blocked, replace it immediately, and it is recommended to replace it regularly every 800 hours);2.Check the fuel system pressure (standard 12 MPa, if the pressure is insufficient, check the atomization of the fuel injector or replace the fuel pump);3.Check the oil level and viscosity of engine oil (the oil grade must meet API CI-4 level, the oil level is lower than the standard and needs to be refilled, and the oil must be replaced if the viscosity is abnormal).
Q 2:The bulldozer is slow and weak to lift and can not withstand the rated load. What are the possible causes?
A : 1.Check the hydraulic oil level and pollution level (the oil level should be 2/3 of the oil tank, and the oil pollution level exceeds NAS level and needs to be filtered or replaced, and HV 46 hydraulic oil is recommended);2.Dismantle the hydraulic pump and check the plunger wear (the plunger gap exceeds 0.05 mm, so the pump core needs to be replaced);3.Calibrate the pressure of the load-sensitive valve (standard 25 MPa, low pressure needs to adjust the preload of the valve core spring).
Q 3: How to deal with the gearbox shifting stuck in a low temperature environment or even unable to shift?
A :1.Start the gearbox warm-up function (power on for 30 minutes, oil temperature rises above 15 ° c before trying to shift);2.Check the transmission oil grade (GL-5 85 W-90 gear oil is used at low temperatures, and ordinary oil is replaced);3.Troubleshoot the wiring fault of electro-hydraulic proportional valve (if the contact is poor, the terminal needs to be plugged and unplugged again, and the valve core is stuck, it needs to be removed and cleaned, and low-temperature grease should be added).
Q 4: The track is frequently derailed, but it has not improved after adjusting the tension. Could there be any problem?
A :1.Check whether the track roller/guide wheel is worn locally (wheel diameter is worn more than 8 mm or rim needs to be replaced due to deformation);2.Check whether the track shoe pins are excessively worn (the track assembly with a pin gap of more than 2 mm needs to be replaced);3.Avoid long-term overload or sharp turn on one side of the track during operation (the turning angle is recommended to be ≤ 20, and it is necessary to slow down and turn when working on hard ground).
Q 5: How to solve the problem that the oil temperature of the hydraulic system continues to be too high (exceeding 75℃) and the cooling fan works normally?
A :1.Clean up the dust and sundries on the radiator surface (it is recommended to use a high-pressure water gun to wash it every week to avoid catkins and dust blocking the radiator core);2.Check whether the hydraulic pipeline is blocked or bent (disassemble the pipeline and use compressed air purge to ensure smooth flow);3.Check the viscosity of the hydraulic oil (HV 68 hydraulic oil needs to be replaced in high temperature environment. If the oil is oxidized and deteriorated, the whole system needs to be replaced and the fuel tank needs to be cleaned). stem needs to be changed and the oil tank needs to be cleaned).
Conclusion
In a word, the SD22 bulldozer is a reliable and effective choice for bulldozer road construction projects. Its powerful engine, high operation efficiency, precise control and excellent durability make it stand out in the market. Whether you are working on mine stripping, water conservancy infrastructure, or highway and railway construction, the SD22 is designed to meet your needs and exceed your expectations.
