The three main operational modes of the CMM-G are: (1) draining the used oil using a vacuum pump, (2) gearbox flushing where high-pressure flushing fluid is forced through internal channels to remove residual contaminants, and (3) supplying clean heated and filtered oil back into the gearbox. Each mode is essential to ensure contaminants are removed and fresh oil meets required cleanliness levels before turbine operation resumes.