Material Specifications: Housing: Cast iron End Plates: Cast iron End Covers: Cast iron Rotors: Ductile iron Shafts: Ductile iron cast integrally with rotors Drive Shaft: SAE 4140 forged alloy steel Bearings: Gear end - Double row ball, both rotors Back end - Cylindrical roller Drive Shaft: Single row ball Gears: Alloy steel, helical cut and precision ground Seals: Drive shaft - Mechanical Rotor shafts - Mechanical or Non-contacting slinger Lubrication: Oil splash system, both ends