Main Pump Solenoid Valves for Komatsu PC200/300/400 -7/-8
Basic Information
Alternative names: EPC solenoid valve, proportional solenoid valve, hydraulic pump pilot solenoid valve
Applicable models
- PC200-7, PC200-8
- PC300-7, PC300-8
- PC400-7, PC400-8 (including long chassis version)
OEM part numbers
- 702-21-57400: Common model for PC200-7/8
- 702-21-57500: Common model for PC300/400-7/8
- 702-21-55901: Old version & alternative part number
Technical Specifications
- Working voltage: 24V DC
- Coil type: Waterproof sealed type, 2-pin male connector
- Control mode: EPC/LS-EPC proportional control, displacement adjusted by current signal
- Pilot pressure range: 0–70 bar
- Maximum main system pressure: 350 bar
- Pilot flow rate: 5–15 L/min
- Operating temperature: -20℃ ~ 120℃
- Seal material: Nitrile rubber (NBR)
- Weight: 0.8–1.0 kg
- Installation torque: 27–33 N·m
Functions
- Electronic Power Control: Receives current signals from controller to steplessly adjust main pump displacement, matching load and engine power output
- Load Sensing Control: Optimize hydraulic system response, reduce overflow loss, achieve fuel economy and stable operation
- Working mode switching: Regulate speed and power of boom, arm, bucket and swing movements
- Overload protection: Prevent main pump overload and engine stall, improve overall equipment durability
Structural Features
1. Proportional electromagnet delivers linear thrust to control spool opening, featuring fast response and high control accuracy
2. High-strength alloy valve body, vibration and impact resistant, suitable for harsh construction working conditions
3. Multi-layer sealing structure, effective against oil leakage, dust and water ingress
4. Plug-and-play design, fully compatible with original installation interface for direct replacement without modification
Common Faults & Impacts
- Spool sticking or wear: Slow movement, insufficient power, drifting action and unstable speed
- Coil burnout: No hydraulic output and system alarm
- Oil leakage: Insufficient system pressure, high oil temperature and increased fuel consumption
- Connector water ingress or corrosion: Intermittent malfunction and unstable performance
Installation & Replacement
- Mounting position: Side of main hydraulic pump, universal fit for PC200/300/400 -7/-8 series
- Replacement procedure: Remove old valve, clean mounting surface, fasten with standard torque and connect wiring connector
- Compatibility: Part numbers 702-21-57400 and 702-21-57500 can perfectly replace original factory components
Main Pump Solenoid Valves for Komatsu PC200/300/400 -7/-8: Detailed Information
1. Product Features:
• High-Precision Control: These solenoid valves are designed to precisely control the flow and pressure of the hydraulic pump, ensuring stable operation of the excavator under various working conditions.
• Strong Durability: Manufactured with high-quality materials, they exhibit excellent wear resistance, corrosion resistance, and fatigue resistance, enabling long-term use in harsh working environments.
• Rapid Response: The solenoid valves have a short response time, allowing for quick adjustment of the hydraulic pump's output to meet the excavator's need for rapid movements.
• Easy Installation and Maintenance: The threaded connection makes installation and removal simple and quick, while their design also facilitates cleaning and inspection.
2. Application Areas:
• Primarily used in the hydraulic systems of Komatsu PC200/300/400 -7/-8 series excavators as electromagnetic control components for the main pump, regulating the flow and pressure of the hydraulic pump.
• Can also be applied in other construction machinery that requires precise control of the hydraulic system.
3. Technical Parameters (Examples):
• Model: May vary depending on the specific product, but typically matches the excavator model, such as solenoid valves suitable for PC200-7/8, PC300-7/8, and PC400-7/8.
• Operating Voltage: Usually the standard voltage of the excavator's electrical system, such as 24V DC.
• Flow Range: Depending on the hydraulic pump design, it may reach several hundred liters per minute (L/min).
• Pressure Range: Capable of withstanding high pressures in the hydraulic system, potentially reaching several hundred bar.
• Connection Type: Threaded connection for easy installation and removal.
4. Compatible Models:
• Specifically compatible with Komatsu PC200-7/8, PC300-7/8, PC400-7/8, and other series excavators, which are widely used in the construction machinery industry and have a high market share.
5. Purchase Recommendations:
• Choose Authorized Channels: To ensure product quality and after-sales service, it is recommended to purchase from authorized construction machinery parts suppliers or Komatsu's official channels.
• Ensure Model Compatibility: When purchasing, make sure the selected solenoid valve model matches your excavator model to avoid compatibility issues or suboptimal performance.
• Understand Product Performance: Before purchasing, gather information on product performance parameters and user reviews to select the product that best meets your needs.
