English to French Tech/Engineering Mechanics / Mech Engineering

This actually doesn't have much context in the sense that it isn't being used in a sentence but a field in a spreadsheet. The spreadsheet is a checklist for services carried out on various machinery on a building site. Down one side there is a column that lists all of the things to be checked (break system, hydraulic system, battery, etc...) and this is one entry in that column. Unfortunately I am struggling to find the equivalent in French.

I have found a couple of instances of 'degrippage de courroie du ventilateur' and 'repliement de courroie du ventilateur' but I don't think that either of those are at all correct!

Any help much appreciated!!!