Under the supervision of the person in charge, the gear box assembler/fitter must assemble the various components (bearings, shafts, bolts, gearboxes, etc.) and mount the reducers according to the model or models requested. His tasks will be to interpret various assembly plans and instructions and make adjustments and mechanical assemblies of gearboxes using standard mechanical assembly and adjustment tools. He will have to clean and test gearboxes and ensure their quality (paint, size, sealing).