The Hitachi ZAXIS series excavators, including models 330-3, 330LC-3, 350H-3, and 350LCH-3, represent a robust line of construction equipment engineered for demanding tasks. These machines are powered by reliable Cummins QSL9-C engines, delivering substantial horsepower and torque for efficient operation. With advanced hydrostatic transmissions and a focus on operator comfort and productivity, the ZAXIS excavators are designed for durability and performance in a wide range of earthmoving applications. Their construction emphasizes quality engineering to ensure longevity and operational excellence. This comprehensive service manual provides detailed information essential for the maintenance and repair of the Hitachi ZAXIS excavators. It covers critical areas such as engine specifications, hydraulic system details, transmission operation, and undercarriage components. Owners, technicians, and mechanics will find step-by-step procedures, diagnostic guidance, and technical data to ensure optimal performance and longevity of their equipment. The manual is intended to be the definitive resource for all service-related needs, promoting safe and effective upkeep.