One is that how to demount the wheel and the output shaft that were too difficult to demount in the L60 vertical axial-flow fans,the other problem is to test static balance about the wheel.

• 就L60立式轴流风机轮毂与输出轴难于拆卸的问题和叶轮静平衡测试问题进行探讨,并提供用自制的简易龙门架和静平衡装置的方法进行检修的经验。