If a single inlet fan has too much axial movement, what action should be taken?

When dealing with a single inlet fan that exhibits too much axial movement, it is crucial to manage the positioning of the shaft to maintain proper functionality and prevent damage. Locking the bearing furthest from the fan is the correct action to take because this will help to stabilize the shaft and reduce excessive axial play.

The rationale behind this is that the bearing furthest from the fan serves as a point of resistance against the axial movement. By locking it in place, you effectively minimize the possibility of the shaft moving too close to or away from the fan, which can lead to operational issues and potential damage to the fan components. Proper alignment and secure positioning are essential to ensure optimal performance and longevity of the fan system.

In contrast, locking the bearing closest to the fan or all bearings may not solve the issue of axial movement effectively, as they do not directly address the source of the motion. Loosening all set screws would exacerbate the problem, as it would allow even greater movement of the shaft.