VALVE;RELIEF 4348749 - Hitachi
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Genuine Hitachi RELIEF VALVE - Part Number: 4348749
This is a high-quality, genuine Hitachi RELIEF VALVE with the part number 4348749. As a crucial component in your machinery, this valve ensures optimal performance and safety.
SWAFLY MACHINERY CO., LIMITED specializes in excavator parts and mining equipment parts in China. Founded in 2009, we can supply a quality-trusted full range of machinery engines, hydraulic pumps, and travel final motor drives based on more than 15 years of endeavor and experience. And we also provide agricultural tractor machinery engines with KUBOTA and Yanmar brands.
Our company takes advantage of resources, absorbs the technology and experience of leading engine manufacturers, establishes maintenance workshops, develops mechanical dismantling, engine, and hydraulic system assembly maintenance and regeneration platforms, and carries out a complete machine and parts renewal business. We timely develop cost-effective OEM or high-quality aftermarket products, providing a full range of aftermarket services for global customers.
Understanding Key Components
Hydraulic Pump (液压泵): A mechanical device that converts mechanical power into hydraulic energy (typically in the form of flow). It is installed within the hydraulic system, often near the engine or a dedicated power source. For example, a Hitachi EX200 excavator uses a Kawasaki K3V series hydraulic pump with part number K3V112DT-9R24.
Travel Final Motor Drive (行走终传动马达): A hydraulic motor that provides the final drive power to the tracks or wheels of an excavator or other machinery, enabling movement. It is located at each track or wheel assembly. For instance, a Komatsu PC200-8 excavator uses a travel motor with part number 708-2L-00161.
Pilot Pump (先导泵): A small hydraulic pump that provides the pressure for controlling the main hydraulic valves. It's typically mounted on the main hydraulic pump. A Caterpillar 320D excavator uses a pilot pump with part number 235-7054.
Swing Motor (回转马达): A hydraulic motor that powers the rotation of the upper structure of an excavator. It's installed on the upper frame, connected to the swing gearbox. A Kobelco SK200-8 excavator uses a swing motor with part number YN24V0004F1.
Main Control Valve (主控制阀): Directs the flow of hydraulic fluid from the pump to the various actuators (cylinders and motors). It is usually located centrally in the hydraulic system. A Volvo EC210B excavator utilizes a main control valve with part number VOE14522199.
Boom Cylinder (动臂油缸): A hydraulic cylinder that lifts and lowers the boom of an excavator. It is attached between the main frame and the boom arm. A Sany SY215C excavator has a boom cylinder with part number 12384840.
Arm Cylinder (斗杆油缸): A hydraulic cylinder that controls the movement of the arm (dipper stick) of an excavator. It is located between the boom and the arm. A Doosan DX225LC-9 excavator uses an arm cylinder with part number 209-00183.
Bucket Cylinder (铲斗油缸): A hydraulic cylinder that controls the tilting and dumping of the bucket of an excavator. It is attached to the end of the arm and the bucket linkage. A Hyundai R210LC-7 excavator has a bucket cylinder with part number 31Q6-40140.
Gear Pump (齿轮泵): A type of positive displacement pump that moves fluid by means of gears rotating inside a chamber. Often used as auxiliary or pilot pumps. A common gear pump used in various machinery has a generic part number like CB-P32C-F10.
Axial Piston Motor (轴向柱塞马达): A type of hydraulic motor that uses pistons moving parallel to the axis of rotation to generate torque. Used in travel drives and swing mechanisms. A Liebherr R924 excavator might use an axial piston motor with part number 9140778 for its swing function.
Common Questions
What are the common causes of hydraulic pump failure in excavators?
Common causes include contamination of hydraulic fluid, cavitation due to low fluid levels or restricted intake, overheating, and worn or damaged internal components.
How often should I replace the hydraulic filters in my mining equipment?
The replacement interval depends on the operating conditions and the manufacturer's recommendations, but generally, hydraulic filters should be changed every 500 to 1000 hours of operation.
What are the signs of a failing travel final motor drive?
Signs of a failing travel final motor drive can include slow or weak movement of the machine, unusual noises from the drive unit, hydraulic leaks, and overheating of the motor.
Engine Troubleshooting Tip
Problem: Engine Overheating
Possible Causes and Solutions:
- Low Coolant Level: Check the coolant level in the radiator and expansion tank. Add the recommended coolant mixture if necessary.
- Faulty Thermostat: The thermostat might be stuck closed, preventing proper coolant circulation. Consider replacing the thermostat.
- Radiator Issues: The radiator fins might be clogged with debris, or there could be internal blockage. Clean the radiator externally with compressed air and consider flushing the system. Inspect for leaks.
- Water Pump Malfunction: The water pump might not be circulating coolant effectively. Check for leaks or unusual noises from the pump; replacement might be required.
- Loose or Damaged Fan Belt: Ensure the fan belt is in good condition and properly tensioned to drive the cooling fan. Replace if damaged or loose.
For inquiries about this Hitachi RELIEF VALVE 4348749 and other excavator parts and mining equipment parts, please contact us:
Mobile/WeChat/WhatsApp: +86 13570162348
Email: sales05@swaflyexcavator.cn
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