HIGH QUALITY 4446002 Main Valve Main Relief Valve Fan Adjusting Valve for HD250
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High Quality 4446002 Main Valve Main Relief Valve Fan Adjusting Valve for HD250
Introducing the high-quality 4446002 Main Valve, a crucial component also functioning as a Main Relief Valve and Fan Adjusting Valve, specifically designed for the HD250 series of machinery. This versatile valve plays a vital role in regulating hydraulic pressure and controlling the fan speed, ensuring optimal performance and efficiency of your equipment. Sourced by SWAFLY MACHINERY CO., LIMITED, a trusted supplier of excavator parts and mining equipment parts in China, this valve meets stringent quality standards for reliable operation.
As a leading provider established in 2009, SWAFLY MACHINERY CO., LIMITED specializes in a comprehensive range of machinery components. With over 15 years of experience, we supply quality-trusted machinery engines, hydraulic pumps, and travel final motor drives. Our expertise extends to agricultural machinery, where we offer engines from renowned brands like KUBOTA and Yanmar.
Our company leverages extensive resources and incorporates the technology and experience of leading engine manufacturers. We operate maintenance workshops and have developed advanced platforms for mechanical dismantling, engine, and hydraulic system assembly maintenance and regeneration. This allows us to offer a complete machine and parts renewal business. We are committed to timely developing cost-effective OEM or high-quality aftermarket products, providing comprehensive aftermarket services to our global clientele.
Ensure the smooth and efficient operation of your HD250 equipment with this premium Main Valve, Main Relief Valve, and Fan Adjusting Valve. Trust SWAFLY MACHINERY CO., LIMITED for all your excavator parts and mining equipment parts needs.
Glossary of Hydraulic Pump and Travel Final Motor Drive Components
Hydraulic Pump (液压泵)
Installation Location: Typically mounted to the engine or gearbox and connected to the hydraulic tank.
A device that converts mechanical power into hydraulic power. For example, a Kayaba Hydraulic Pump model K3V112DT uses a Swash Plate (斜盘) with part number 344-50001.
Travel Final Drive (行走减速器)
Installation Location: Located in the undercarriage, connected directly to the track or wheel.
A gearbox that reduces the high-speed, low-torque output of the hydraulic travel motor to a low-speed, high-torque output needed to propel the machine. For instance, a Nachi Travel Motor model PVD-2B-42P incorporates a Planetary Gear Set (行星齿轮组) with part number 203-00012.
Control Valve (控制阀)
Installation Location: Usually situated between the hydraulic pump and the actuators (cylinders, motors).
Directs the flow of hydraulic fluid to various parts of the machine. A Rexroth Control Valve for a Hitachi ZX200 excavator contains a Spool (阀芯) with part number R902443001.
Hydraulic Cylinder (液压缸)
Installation Location: Used in various parts of the machine for lifting, pushing, and pulling actions (e.g., boom, arm, bucket).
A linear actuator that converts hydraulic power into mechanical force. A Komatsu PC200 excavator's boom cylinder includes a Piston Seal (活塞密封) with part number 707-99-67130.
Hydraulic Motor (液压马达)
Installation Location: Used in the travel final drive and swing mechanism.
Converts hydraulic power into rotary mechanical power. A Eaton Hydraulic Motor model JMF200 utilizes a Shaft Seal (轴封) with part number 848354.
Relief Valve (溢流阀)
Installation Location: Integrated within the main control valve or as a separate component in the hydraulic system.
Protects the hydraulic system from overpressure. A common Bosch Rexroth Relief Valve has a Valve Poppet (阀芯) with part number R900021276.
Solenoid Valve (电磁阀)
Installation Location: Often found on the main control valve or pilot control system.
An electrically controlled valve used to direct or stop hydraulic fluid flow. A SMC Solenoid Valve model VQC4101-5 includes a Coil (线圈) with part number VQC4000-11A.
Gear Pump (齿轮泵)
Installation Location: Can be used as a main hydraulic pump or for auxiliary functions.
A type of positive displacement pump that uses meshing gears to pump fluid. A Parker Gear Pump model P31 contains a Drive Gear (驱动齿轮) with part number 3652281000.
Piston Pump (柱塞泵)
Installation Location: Commonly used as the main hydraulic pump in excavators and other heavy machinery.
A type of positive displacement pump that uses reciprocating pistons to pump fluid. An IHI Piston Pump model VP15 has a Piston Shoe (柱塞滑靴) with part number JMV-044-27-1-9001.
Swing Motor (回转马达)
Installation Location: Located in the upper structure of an excavator, responsible for rotating the cab and boom.
A hydraulic motor specifically designed for the rotational movement of the upper structure. A Kawasaki Swing Motor model KMB90 includes a Pinion Gear (小齿轮) with part number K3032-31100.
Frequently Asked Questions
What are the common signs of a failing hydraulic pump in an excavator? Common signs include slow or weak hydraulic functions, unusual noises from the pump, overheating of the hydraulic fluid, and foamy or milky hydraulic oil.
How often should I replace the hydraulic filters in my mining equipment? Hydraulic filter replacement frequency depends on the operating environment and manufacturer recommendations, but generally, it's recommended every 500 to 1000 hours of operation.
Can you supply travel final drives for different excavator brands? Yes, SWAFLY MACHINERY CO., LIMITED can supply travel final motor drives for a wide range of excavator brands and models. Please provide your specific requirements for a quotation.
Engine Troubleshooting Tip: Overheating
Problem: Engine Overheating
Possible Causes and Solutions:
Low Coolant Level: Check the coolant level in the radiator and expansion tank. If low, add the recommended coolant mixture. Look for leaks in hoses, radiator, or water pump.
Faulty Thermostat: The thermostat regulates coolant flow. If it's stuck closed, the engine can overheat. Replace the thermostat with a new one of the correct temperature rating.
Clogged Radiator: A blocked radiator restricts coolant flow and reduces heat dissipation. Flush the radiator and cooling system. If heavily clogged, professional cleaning or replacement might be necessary.
Defective Water Pump: The water pump circulates coolant. If the pump impeller is damaged or the pump is failing, it won't circulate coolant effectively. Inspect the water pump for leaks or damage and replace if needed.
Fan Malfunction: The fan helps to cool the radiator. Check if the fan is operating correctly when the engine is hot. If it's an electric fan, check the motor and related electrical components. If it's a mechanically driven fan, inspect the fan belt for proper tension and condition.
Our Business
SWAFLY MACHINERY CO., LIMITED specializes in providing high-quality excavator parts and mining equipment parts. Founded in 2009, we have over 15 years of experience in the industry. Our core offerings include quality-trusted machinery engines, hydraulic pumps, and travel final motor drives. We also supply agricultural tractor machinery engines from brands like KUBOTA and Yanmar.
We excel in maintenance workshops, mechanical dismantling, engine and hydraulic system assembly maintenance, and regeneration. Our business extends to complete machine and parts renewal. We are dedicated to developing cost-effective OEM or high-quality aftermarket products and providing comprehensive aftermarket services to our global customer base.
Visit our website for more information: www.hitachi-isuzuparts.com
Mobile/WeChat/WhatsApp: +86 13570162348
Email: sales05@swaflyexcavator.cn
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