This Specification has been developed by the Crane Manufacturers Association of America, Inc. (CMAA), an organization · viewCHASSIS SPECIFICATIONS Axle (Front)Axle (Rear)Axle (Ratio)BatteryBrakesBumper (Front)Drive Shaft CMAASpecifications for Top Running Bridge Gantry Type-rEV CMAA_parte1 CMAA SPECIFICATION NOSPECIFICATIONS FOR TOP RUNNING AND UNDER RUNNING SINGLE GIRDER ELECTRIC TRAVELING CRANES UTILIZING UNDER RUNNING TROLLEY HOIST INTRODUCTION. Description Crane Standard Account Login. CMAA