三一重工SY5541THB 660C-9泵车的主要优点包括：1. 高效节能：采用先进的液压系统和发动机技术，确保泵送效率高，能耗低。2. 大功率泵送：配备高压输送泵和大容量输送管道，最大输送压力高达66MPa，最大水平泵送距离可达到210m，垂直泵送距离可达到60m，具有适应各种工程需求的能力。3. 稳定可靠：采用优质的底盘和电控系统，具有稳定的运行性能和可靠的工作状态。4. 灵活性强：配备可调节折叠型臂架，可在狭小空间内进行泵送作业；同时，具备360度旋转功能，能够灵活应对各种工地环境。5. 操作简便：配备全电脑控制系统，操作界面友好，操作简便，可实现自动控制和远程监控。6. 使用寿命长：采用高强度钢材制造，结构牢固，耐用，能够经受长时间高强度工作的考验。综上所述，三一重工SY5541THB 660C-9泵车具有高效节能、大功率泵送、稳定可靠、灵活性强、操作简便和使用寿命长等诸多优点，适用于各种工程泵送需求。

The main advantages of Sany SY5541THB 660C-9 pump truck include: 1. high efficiency and energy saving: adopting advanced hydraulic system and engine technology to ensure high pumping efficiency and low energy consumption. 2. high power pumping: equipped with high-pressure transfer pump and large-capacity conveying pipeline, the maximum conveying pressure is as high as 66MPa, and the maximum horizontal pumping distance is up to 210m and vertical pumping distance is up to 60m. 3. stable and reliable: adopting high quality chassis and electronic control system, it has stable running performance and reliable working condition. 4. flexible: equipped with adjustable folding boom, it can be used in a variety of projects. It has the ability to adapt to various engineering needs.3. Stable and reliable: It adopts high-quality chassis and electric control system, which has stable operation performance and reliable working condition.4. Flexible: It is equipped with adjustable folding boom, which can carry out pumping operation in narrow space; meanwhile, it has 360-degree rotating function, which can flexibly cope with various construction site environments.5. Easy operation: It is equipped with a fully computerized control system, which has a friendly operation interface and easy operation. The operation interface is friendly and easy to operate, and it can realize automatic control and remote monitoring. 6. Long service life: It is made of high-strength steel, with solid structure and durability, and it can stand the test of long-time and high-intensity work. 7. To summarize, Sany Heavy Industry SY5541THB 660C-9 pump truck has many advantages such as high efficiency and energy saving, high power pumping, stable and reliable, strong flexibility, easy operation and long service life, which is suitable for all kinds of engineering pumping needs.