Warning signs of derailment

• If you find that the wheels are producing screeching noise while travelling in a certain area in the bay length
• If the wheel flanges are wearing off
• If the Rail is getting weared off

Action Steps to be taken to avoid Derailment

1. Check the rail alignment (https://www.revacranes.com/rail-allignement-and-tolerances/)- if the alignment is not within tolerance then follow the second step.
2. Check the level difference between the rails across span. Typically this measurement is usually not done and this is the most important reason for the derailment. Check the tolerance the rail level should be within the tolerances.
3. Check the diameter of all the wheels : in case the diameter of one of the wheel is more than the other, this wheel will move faster than the other wheels and will cause crane to skew, and hence either the wheel flanges or rail will wear off.

1. Also check the gap between the rail and the wheel flanges if it is more than 25mm, then there is more allowance for the crane to move laterally and skew. When the crane is in extreme skew condition the more lateral forces are applied on the wheel flange, causing the wheel flanges to either break or wear and also may cause rail wear and ultimately Crane derailment.
2. If none of the above then the span of crane and the diagonal of the crane needs to be checked, it could be that due to frequent colliding of the crane with the other crane or for some other reasons as overloading etc a permanent defamation has happened which has caused change in the span or the diagonal of the crane. This needs to be attended urgently.

Important TIP