Cummins Fleetguard Monitor - Hydraulic Fluid Analysis Kit Cummins Filtration Offers A Complete Line Of Fleetguard Transmission Filtration Products And Fluid Analysis Programs As Part Of Your Regular Transmission Maintenance Program. Because Transmission Fluid Cools, Lubricates And Transmits Hydraulic Power, It Is Critical To Maintain Adequate Fluid Levels In Your System At All Times. When The Fluid Level Is Too Low, The Converter, Bushings, Bearings And Clutches Do Not Receive An Adequate Supply Of Fluid.