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The Hitachi EX200-3 hydraulic excavator features a sophisticated pump control system critical for efficient machine operation. This system manages hydraulic pressure and flow, enabling precise control over the boom, arm, bucket, swing, and travel functions, ensuring smooth and responsive machine performance.
Pump Control System Design
The EX200-3 utilizes variable displacement piston pumps controlled by an electronic system that adjusts flow based on operator demand and engine speed. This design reduces fuel consumption by matching pump output to actual hydraulic requirements, increasing efficiency and minimizing heat generation in the hydraulic system.
Pressure compensators and flow controls regulate the pump operation, maintaining consistent force and speed for excavation tasks. The system includes relief valves to protect against excessive pressure, preventing damage to hydraulic components.
Operator Interface
Operators control functions through hydraulic joystick control levers that interface with pilot valves. These valves modulate hydraulic flow proportional to joystick movement, providing fine control. The hydraulic system also incorporates walking pedals and foot controls for travel and auxiliary functions.
A monitor panel displays key hydraulic system parameters, such as oil temperature and pressure, alerting operators to abnormalities. Diagnostic codes related to pump and valve function are accessible for maintenance purposes.
Maintenance and Troubleshooting
Routine maintenance includes checking hydraulic fluid levels and cleanliness, inspecting hoses and fittings, and testing pump pressure regularly. Early signs of pump issues include spongy or unresponsive controls, unusual noises from the hydraulic pump, and decreased lifting or traveling performance.
Troubleshooting often involves verifying electrical connections to the pump control unit and pilot valves, measuring system pressure with gauges, and inspecting for leaks or mechanical wear in pump components.
Technical Data Highlights
Operators appreciate the EX200-3 pump control system for its balanced combination of power and fuel efficiency. One reported scenario involved a hydraulic pump replacement restoring precise control and improving cycle times on a challenging digging project, illustrating the system’s pivotal role in machine productivity.
Glossary
The pump control system of the Hitachi EX200-3 is integral to its operational success, providing efficient, responsive hydraulic power for precise excavation. Proper maintenance and understanding of system components ensure reliable performance and extend equipment life on demanding job sites.
Pump Control System Design
The EX200-3 utilizes variable displacement piston pumps controlled by an electronic system that adjusts flow based on operator demand and engine speed. This design reduces fuel consumption by matching pump output to actual hydraulic requirements, increasing efficiency and minimizing heat generation in the hydraulic system.
Pressure compensators and flow controls regulate the pump operation, maintaining consistent force and speed for excavation tasks. The system includes relief valves to protect against excessive pressure, preventing damage to hydraulic components.
Operator Interface
Operators control functions through hydraulic joystick control levers that interface with pilot valves. These valves modulate hydraulic flow proportional to joystick movement, providing fine control. The hydraulic system also incorporates walking pedals and foot controls for travel and auxiliary functions.
A monitor panel displays key hydraulic system parameters, such as oil temperature and pressure, alerting operators to abnormalities. Diagnostic codes related to pump and valve function are accessible for maintenance purposes.
Maintenance and Troubleshooting
Routine maintenance includes checking hydraulic fluid levels and cleanliness, inspecting hoses and fittings, and testing pump pressure regularly. Early signs of pump issues include spongy or unresponsive controls, unusual noises from the hydraulic pump, and decreased lifting or traveling performance.
Troubleshooting often involves verifying electrical connections to the pump control unit and pilot valves, measuring system pressure with gauges, and inspecting for leaks or mechanical wear in pump components.
Technical Data Highlights
- Hydraulic System Fluid Capacity: Approx. 60.8 gallons
- Cooling System Fluid Capacity: Approx. 5.6 gallons
- Operating Voltage: 24 volts
- Engine Oil Capacity: About 6.7 gallons
- Typical Pump Flow: Around 97.8 gallons per minute at rated engine speed
Operators appreciate the EX200-3 pump control system for its balanced combination of power and fuel efficiency. One reported scenario involved a hydraulic pump replacement restoring precise control and improving cycle times on a challenging digging project, illustrating the system’s pivotal role in machine productivity.
Glossary
- Variable Displacement Pump: A pump capable of adjusting its output flow in response to system demands, enhancing efficiency.
- Pilot Valve: A control valve operated by low-pressure fluid directing the main hydraulic flow per operator input.
- Pressure Compensator: A device that maintains constant pressure within the hydraulic system for smooth operation.
- Relief Valve: A safety valve that prevents system pressure from exceeding design limits.
- Diagnostic Codes: System-generated alerts indicating faults in hydraulic or electrical components.
The pump control system of the Hitachi EX200-3 is integral to its operational success, providing efficient, responsive hydraulic power for precise excavation. Proper maintenance and understanding of system components ensure reliable performance and extend equipment life on demanding job sites.
