Definição, Classificação, Relação de transmissão, Tipo de redutores, Forma construtiva, potência, Elementos internos dos redutores, lubrificação, vedação, Desmontagem, Montagem;

ABNT NBR 15154:2014 - Qualification and certification of maintenance mechanics - Requirements;
ABNT NBR 5462: 1994 - Reliability and maintainability;
ABNT NBR 16748:2019 - Hand tools, abrasive and interchangeable - Recommendations for identification; 
ABNT ISO/IEC GUIDE 99:2014 - International Metrology Vocabulary - Fundamental and general concepts and terms 
associates;
NR-12 - Safety at Work in Machinery and Equipment;
ABNT NBR ISO 9001:2015 - Quality management systems - Requirements;
ABNT NBR 10474:2015 - Welding qualification - Terminology;
NR-6 is Personal Protective Equipment - PPE.