Learn Spanish (Latin America): Hacer una revisión visual del engranaje.

Using the infinitive is very common in Spanish for impersonal instructions, such as in manuals, recipes, or on warning signs. It tells the reader what needs to be done without addressing any specific person (like "you"). This is why you see Hacer instead of an imperative command.

Does engranaje mean a single gear wheel, or the whole system?

El engranaje usually refers to the entire gearing system, mechanism, or the way the gears interlock. If you need to talk about one specific gear wheel or cog, it is more commonly called un engrane (especially in Mexico and parts of Latin America) or una rueda dentada.

Is there a rule for the gender of words ending in -aje like engranaje?

Yes! Almost all Spanish nouns ending in -aje are masculine, which is why it's el engranaje (and del engranaje here). This is a very helpful pattern to remember for words like el viaje (the trip), el mensaje (the message), and el equipaje (the luggage).

Could I just say Revisar visualmente el engranaje instead?