Grease guns are primarily used to insert grease into which component?

Grease guns are primarily designed to deliver grease into Zerk fittings, which are specific types of grease fittings commonly found on various machine tools and mechanical equipment. These fittings provide a convenient way to inject lubrication directly into bearings, joints, and other components that require regular maintenance to ensure smooth operation. By using a grease gun, operators can effectively fill these areas with lubricant, thereby reducing friction, wear, and the risk of failure.

Zerk fittings are specifically engineered to prevent dirt and other contaminants from entering the lubricated component, which is crucial for maintaining the integrity and longevity of the machinery. This makes them an ideal match for the use of a grease gun, as the pressurized delivery of grease can seal out contaminants while ensuring that the internal grease channels are adequately filled.

While pulleys may require lubrication, they do not typically have Zerk fittings specifically for grease. Electrical motors and hydraulic systems might require different types of lubricants or maintenance approaches, such as oil or specialized fluids, rather than the grease delivered by a grease gun. Therefore, the primary use of grease guns is unequivocally linked to Zerk fittings on machine tools.