Portuguese to English Tech/Engineering Energy / Power Generation insurance contract termi

This is from an exerpt from a damage report on a Hydroelectric horizontal Turbine, which upon making strange noises was closed down and opened up to find problems with one of the turbine blades.
Throughout this report they keep mentioning ' the alavanca of the (turbine) blade', - to give it the literal translation of ' the turbine blade lever' does not make much sense, I was wondering if it was the 'angle' that the blade makes with the rotor/stator or something to do with the keyway which the blade fits into??
Any suggestions gratefully received with thks.

Full context example follows:

Este desgaste (evidenciado na inspeção das peças internas) causou um aumento considerável do atrito em operação e dos esforços sobre todo o mecanismo e a alavanca da pá n.º 2 (os mecanismos das demais pás não apresentaram problema).