Caterpillar 9T3370 Piston Cylinder Barrel

The 9T3370 piston cylinder barrel is a critical component of the rotating group in Caterpillar hydraulic piston pumps. It is engineered to OEM dimensions for precise fit and function in heavy-duty hydraulic systems. The barrel features a hardened steel construction with precision bore finish to ensure optimal sealing and wear resistance against piston shoes. Technical specifications include a compatible piston diameter of 25 mm (0.98 in), an outside diameter of 110 mm (4.33 in), and an overall length of 66.2 mm (2.61 in). This part serves as a direct replacement for Caterpillar OEM part numbers 9T3370 and 9T-3370. It is commonly utilized in hydraulic pumps fitted to Caterpillar 322 and 325 series excavators, M313C wheeled excavators, and D4C III D5C III track tractors powered by C7 and C9 engines.