沃尔沃EW140 CN4国四挖掘机有以下优点：1. 强大的动力系统：搭载先进的国四排放标准发动机，动力强劲、燃油经济，可提供出色的挖掘和装载能力。2. 高效的液压系统：配备先进的液压系统，能够实现高效的工作性能和操作精度，提高工作效率。3. 先进的控制系统：配备精确的电子控制系统，能够实现准确的汽车级驾驶体验，提高机械的稳定性和可靠性。4. 舒适安全的驾驶室：驾驶室宽敞舒适，配备空调和高度可调的座椅，提供良好的操作环境。同时，还配备了先进的安全设备，如防滚护栏和安全带，为操作员提供良好的安全保护。5. 简洁易用的维护系统：沃尔沃EW140 CN4国四挖掘机采用简洁易用的维护系统，可快速进行日常维护和保养，减少机械的停机时间，提高作业效率。6. 高品质的整机配置：选用高品质的液压元件和工作装置，提高挖掘机的可靠性和耐用性，延长使用寿命。总的来说，沃尔沃EW140 CN4国四挖掘机拥有强大的动力、高效的液压系统、先进的控制系统、舒适安全的驾驶室、简洁易用的维护系统和高品质的整机配置等优点，适合用于各种挖掘和装载作业。

Volvo EW140 CN4 National IV Excavator has the following advantages:1. Powerful power system: equipped with advanced National IV emission standard engine, it has strong power and fuel economy, which can provide excellent digging and loading capacity.2. High-efficiency hydraulic system: equipped with advanced hydraulic system, it is able to realize high efficiency working performance and operation precision, and improve working efficiency.3. Advanced control system: equipped with precise electronic control system, it is able to realize accurate automotive-grade driving experience and improve the stability and reliability of the machinery. 4. Comfortable and safe cab: The cab is spacious and comfortable, equipped with air conditioning and height-adjustable seats to provide a good operating environment. Meanwhile, it is also equipped with advanced safety equipment, such as anti-roll barriers and seat belts, to provide good safety protection for the operator.5. Simple and easy-to-use maintenance system: Volvo EW140 CN4 National 4 excavator adopts simple and easy-to-use maintenance system, which can quickly carry out the routine maintenance and upkeep, reduce the machine's downtime, and increase the operational efficiency.6. High-quality machine configuration: High-quality hydraulic components and working devices are selected to improve the stability and reliability of the excavator. and working devices to improve the reliability and durability of the excavator and extend its service life. Overall, Volvo EW140 CN4 national four excavator has the advantages of powerful power, efficient hydraulic system, advanced control system, comfortable and safe cab, simple and easy-to-use maintenance system and high-quality machine configuration, which is suitable for all kinds of excavation and loading operations.