沃尔华GNQY-Z490起重机的优点有：1. 载重能力强：该起重机具有较强的载重能力，可以承载较重的物体或设备，适用于各种建筑工地、码头、港口等场所的起重作业。2. 高度可调节：该起重机的臂架和高度可以进行调节，可以根据实际需求进行灵活的调整，适应不同高度的起重任务。3. 操作简便：该起重机使用简便，配备有先进的操控系统和操作面板，操作人员可以轻松掌握和操作，提高工作效率。4. 安全可靠：该起重机采用先进的安全措施和系统，如过载保护、防倾翻等功能，保证了起重作业的安全性，减少了事故的发生。5. 维护便捷：该起重机采用模块化设计，维护更加便捷，容易进行部件更换和维修，减少了停工时间。6. 运输方便：该起重机具有较小的体积和重量，方便运输和搬迁，适用于临时性工地或需要频繁搬迁的场所。7. 能效高：该起重机采用先进的节能技术和系统，减少了能源消耗和对环境的影响，提高了工作效率。总的来说，沃尔华GNQY-Z490起重机具有强大的载重能力、灵活调节、操作简便、安全可靠、维护便捷、运输方便和高能效等优点，是一款高性能的起重设备。

Advantages of Volvo GNQY-Z490 crane are: 1. strong load capacity: the crane has a strong load capacity, can carry heavier objects or equipment, suitable for lifting operations in various construction sites, wharves, harbors, etc. 2. adjustable height: the crane's jib and height can be adjusted, can be flexibly adjusted according to the actual needs of the lifting tasks of different heights. 3. easy to operate: the crane is easy to use, equipped with advanced control systems and operating panels, the operator can easily grasp and operate, improve work efficiency. 4. safe and reliable: this crane adopts advanced safety measures and operation panels, improve work efficiency. 3. easy operation: the crane is easy to use, equipped with advanced control system and operating panel, the operator can easily grasp and operate, improve work efficiency. 4. safe and reliable: the crane adopts advanced safety measures and systems, such as overload protection, anti-tipping and other functions, to ensure the safety of lifting operations, reduce the occurrence of accidents. 5. convenient maintenance: the crane adopts a modularized design, maintenance is more convenient, easy to carry out component replacement and repair, reducing downtime.6. Convenient transportation: the crane has a small size and weight, easy to transport and relocate, suitable for temporary construction sites or places requiring frequent relocation.7. High energy efficiency: the crane adopts advanced energy-saving technologies and systems, reducing energy consumption and impact on the environment, and improving work efficiency. Overall, Walwart GNQY-Z490 crane is a high-performance lifting equipment with strong load capacity, flexible adjustment, easy operation, safety and reliability, convenient maintenance, easy transportation and high energy efficiency.