Definition - What does Agitator mean?
An agitator, in the context of trenchless technology, is the part of a mud motor that churns drilling fluid to maintain the proper mix in the drilling fluid storage and transportation system. The churning action of a mud motor's agitator stirs the solids in the drilling fluid to ensure that the solid and liquid properties of the drilling fluid are evenly distributed throughout the fluid.
Trenchlesspedia explains Agitator
The solids in drilling fluid will sink to the bottom of a storage or transportation tank. The length of time it takes for solids to settle out of the mixture depends on the type and quantity of solids and other additives. The mud motor's agitator works to mix the solids and liquids of the drilling fluid to maintain a consistent level of fluidity in the fluid base. The agitator is driven by an explosion-proof motor to which a gear box is attached that drives the agitator.