凯斯621F装载机的优点有：1. 功能强大：凯斯621F装载机具有出色的挖掘力和装载能力，能够快速高效地完成各种装载作业。2. 高效节能：凯斯621F装载机采用先进的发动机和液压系统，能够实现更高的效率和更低的能耗，节省燃料成本。3. 操控灵活：凯斯621F装载机的驾驶室设计人性化，操作简便，操控灵活，驾驶员能够更加轻松地完成各项作业。4. 安全可靠：凯斯621F装载机配备了多种安全系统，如防滚保护结构和智能安全提示系统，能够提供更高的操作安全性。5. 维护方便：凯斯621F装载机的维护保养非常方便，各个关键部件的维修点都经过优化设计，减少了维修时间和成本。总体而言，凯斯621F装载机具有强大的工作能力、高效节能、灵活操控、安全可靠和便捷维护等优点，是一款性能卓越的装载机。

The advantages of Case 621F loader include: 1. powerful function: Case 621F loader has excellent digging force and loading capacity, which can quickly and efficiently complete a variety of loading operations. 2. high efficiency and energy saving: Case 621F loader adopts advanced engine and hydraulic system, which can realize higher efficiency and lower energy consumption, saving fuel costs. 3. flexible control: Case 621F loader's cab design is humanized, easy to operate and flexible control. 4. safe and flexible: Case 621F loader is equipped with a variety of safety systems, such as anti-roll protection structure and intelligent control. The cab design is humanized, easy to operate and flexible in control, which enables the driver to complete all operations more easily. 4. Safety and reliability: Case 621F loader is equipped with a variety of safety systems, such as the anti-roll protection structure and the intelligent safety alert system, which can provide a higher level of operational safety. 5. Convenient maintenance: Case 621F loader is very easy to maintain, and the maintenance points of each key component have been optimally designed to reduce the maintenance time. 6. The maintenance points of each key component are optimized, which reduces the maintenance time and cost. Overall, Case 621F loader has the advantages of powerful working capacity, high efficiency and energy saving, flexible control, safety, reliability and convenient maintenance, etc. It is a loader with excellent performance.