This comprehensive workshop manual for the BOMAG BW 120-4 Combination Roller is designed to provide detailed information on the hydraulic system and its intricate circuitry. This invaluable resource offers a wealth of knowledge, presented in a user-friendly manner through clear diagrams and informative explanations. The manual delves into every aspect of the hydraulic system, enabling you to understand its operation and perform maintenance with confidence. From basic principles to advanced troubleshooting, this manual equips you with the necessary knowledge to keep your BOMAG BW 120-4 Combination Roller running smoothly. Whether you are a professional mechanic or a DIY enthusiast, this manual serves as your essential guide for all things related to the hydraulic system of your BOMAG BW 120-4 Combination Roller. Its practical approach and detailed illustrations make it an indispensable tool for any owner or operator seeking to maintain and repair this powerful piece of machinery.

The BOMAG BW 120-4 Combination Roller is a versatile and powerful piece of construction equipment designed for compacting a wide range of materials, from granular soils and gravel to asphalt and stabilized bases. This tandem vibratory roller boasts a robust construction, featuring a powerful diesel engine that drives the two independently driven vibratory drums and a hydraulic system that powers the machine’s various functions. The BW 120-4 is equipped with a number of advanced features, including hydrostatic drive for precise speed control, an adjustable amplitude system for optimal compaction performance, and a user-friendly operator's cab with excellent visibility. Its compact design and maneuverability allow it to operate effectively in tight spaces and on challenging terrain. The BW 120-4's hydraulic system plays a critical role in its functionality. The system is responsible for powering the drums' oscillation, controlling the roller's speed and direction, operating the steering and braking systems, and handling other vital functions. Hydraulic schematics and circuit diagrams provide a detailed visualization of the hydraulic system's components, their connections, and the flow of hydraulic fluid throughout the system. These diagrams are essential for understanding the system's operation, troubleshooting potential problems, and performing maintenance tasks. The diagrams present a visual representation of the various hydraulic components, such as pumps, motors, valves, cylinders, and hoses, and their interconnectedness. By studying these schematics, mechanics and technicians can trace the path of hydraulic fluid, identify pressure points, and understand the logic behind the system's operation. This knowledge empowers them to diagnose and repair issues efficiently, ensuring the smooth and reliable operation of the BW 120-4 combination roller.