Flange Assembly
Фланцевое соединение
Conjunto de brida
The XCMG 803378914 Flange Assembly is a precision-engineered connection component designed to ensure leak-proof, high-pressure fluid transfer in the hydraulic systems of XCMG articulated dump trucks. With OEM number 803378914, this flange assembly provides a robust interface between pipes, hoses, and hydraulic components, maintaining system integrity under extreme vibration, temperature fluctuations, and pressure surges. Its forged steel construction and corrosion-resistant finish guarantee long-term durability in the toughest off-road environments, including mining, quarrying, and heavy construction.
The 803378914 Flange Assembly consists of a precision-machined flange plate, a high-quality O-ring seal, and grade 10.9 mounting bolts. The flange face is ground to a smooth finish to ensure optimal O-ring compression, while the bolt holes are accurately positioned to match standard SAE J518 and ISO 6162 port patterns. This assembly is designed to replace the original factory flange, providing a perfect fit without modifications. The zinc plating and powder coating offer superior protection against rust, chemicals, and abrasion, extending the service life of both the flange and the connected system.
Whether used in steering gear connections, brake valve interfaces, suspension accumulator ports, or cooling system joints, the XCMG flange assembly delivers consistent, reliable sealing performance. Replacing a corroded or damaged flange with the 803378914 part eliminates leaks, restores system pressure, and enhances overall machine safety and uptime—making it an indispensable component for any fleet maintenance program.
| Parameter | Specification / Value |
|---|---|
| OEM Number | 803378914 |
| Product Name | Flange Assembly |
| Brand | XCMG |
| Material | Forged steel (SAE 1045 equivalent) |
| Surface Finish | Zinc plating + black powder coat |
| Flange Size (nominal) | SAE 1-inch (1″) / DIN 25 mm |
| Bolt Hole Diameter | 10.5 mm (4 holes) |
| Bolt Center-to-Center | 50.8 mm (2 inches) |
| Seal Type | O-ring (NBR, included) |
| Working Pressure | Up to 350 bar (5,000 psi) |
| Operating Temperature | -50°C to +130°C |
| Bolt Torque (recommended) | 35–40 N·m |
| Corrosion Protection | Salt spray tested ≥ 500 hours |
| Compatible Models | XCMG DA30, DA40, XDA40, DA45 series |
| Application | Hydraulic line connections – steering, brake, suspension, cooling |
The 803378914 Flange Assembly is a critical connecting element in the hydraulic and fluid systems of XCMG articulated dump trucks. It serves as a robust, leak-proof joint between rigid steel pipes and flexible hoses, ensuring that pressurized hydraulic fluid is transferred efficiently and safely across various system components. Its design minimizes pressure drops and eliminates leak paths, which are common failure points in high-vibration machinery.
Manufactured from high-quality forged steel, the flange offers superior strength and resistance to fatigue. The precision-machined sealing face accepts a standard O-ring, which is compressed to form a positive seal that withstands pressure spikes and thermal cycling. The included mounting bolts are of grade 10.9, ensuring adequate clamping force for long-term reliability. This genuine XCMG part is produced to the same specifications as the original flange, guaranteeing a perfect fit and eliminating the need for adapters or modifications.
Replacing a worn or corroded flange with the 803378914 assembly restores the integrity of the hydraulic circuit, preventing costly fluid leaks and system contamination. The durable construction and protective coating ensure a long service life, reducing maintenance frequency and downtime. Whether in steering gear connections, brake valve interfaces, or suspension accumulator ports, this flange assembly is an essential component for maintaining the performance and safety of your articulated dump truck.
Its design adheres to SAE J518 and ISO 6162 standards, making it interchangeable with other components that use the same flange interface, though it is optimized for XCMG equipment. This versatility simplifies spare parts management for fleet operators.
The 803378914 flange assembly is distinguished by its forged steel construction, which provides a superior strength-to-weight ratio compared to cast alternatives. The forging process aligns the grain structure of the steel, enhancing its ability to withstand shock loads and cyclical stress without cracking or deforming. The sealing surface is machined to a fine finish (Ra ≤ 0.8 μm), ensuring optimal O-ring compression and a leak-proof seal.
The zinc plating and powder coat offer excellent corrosion resistance, protecting the flange from rust and chemical attack even in wet, salty, or chemically aggressive environments. The O-ring supplied is made of nitrile rubber (NBR), which is compatible with mineral hydraulic oils, synthetic fluids, and brake fluids, and operates reliably across a wide temperature range (-50°C to +130°C).
The flange’s bolt pattern conforms to standard SAE J518 dimensions, ensuring interchangeability with components from other manufacturers, although it is specifically dimensioned for XCMG applications. The bolts are supplied with a pre-applied thread locker to prevent loosening due to vibration, and each assembly is tested for dimensional accuracy and sealing performance. Additionally, the flange features a clear part number marking for easy identification and traceability.
The assembly also includes a protective plastic plug on the flange face to keep the sealing surface clean during storage and transport, preventing damage before installation.
Replacing a damaged or corroded flange with the genuine XCMG 803378914 assembly eliminates fluid leaks, which are a primary cause of hydraulic system inefficiency and environmental contamination. A leak-free connection ensures that system pressure is maintained, allowing steering, braking, and suspension functions to operate at peak performance. This leads to improved machine control, reduced operator fatigue, and enhanced safety on the job site.
The flange’s robust design minimizes the risk of joint separation due to vibration or thermal expansion, reducing the likelihood of sudden failures that could result in costly downtime or hazardous situations. The high clamping force of the grade 10.9 bolts ensures that the O-ring remains compressed, providing a reliable seal over the entire service interval. The corrosion-resistant coating also preserves the flange’s structural integrity, preventing rust that could weaken the connection over time.
By preventing leaks, the flange assembly reduces fluid consumption and the need for frequent top-ups, lowering operational costs. The improved sealing also helps maintain fluid cleanliness, reducing contamination that can accelerate wear on pumps, valves, and actuators. This extends the life of the entire hydraulic system, reducing overall maintenance expenses.
Overall, the 803378914 flange assembly contributes to higher machine availability, improved fuel efficiency, and a safer working environment, making it a valuable investment for any fleet.
The 803378914 flange assembly is used extensively in the hydraulic systems of XCMG articulated dump trucks, including the DA30, DA40, XDA40, and DA45 models. It is commonly found at the connection points between hydraulic hoses and rigid tubes, such as at the steering pump outlet, brake valve inlet, and suspension accumulator ports. Its robust design makes it suitable for high-pressure circuits where vibration and thermal cycling are prevalent.
In steering circuits, the flange ensures a leak-free connection between the hydraulic pump and the steering gear, providing responsive and accurate steering control, which is essential for maneuvering in tight loading areas. In braking systems, it secures the lines from the master cylinder to the brake actuators, maintaining brake pressure for safe stopping, even under heavy loads.
The flange is also used in suspension systems to connect the height control valves to the accumulators, allowing for dynamic load leveling and ride comfort. Additionally, it is employed in cooling circuits for engine and transmission oil coolers, where its heat resistance and sealing integrity are critical. Its versatility makes it suitable for a wide range of fluid power applications, both original and aftermarket.
By stocking the 803378914 flange assembly, fleet operators can address multiple connection needs with a single reliable part, reducing inventory complexity and ensuring quick repairs.
XCMG applies rigorous quality control to the production of the 803378914 flange assembly. The raw steel is sourced from certified mills and undergoes chemical analysis to confirm its composition and mechanical properties. The forging process is carefully monitored to ensure consistent grain flow and structural integrity, free from internal voids or inclusions.
After machining, each flange is inspected for dimensional accuracy using coordinate measuring machines (CMM). The sealing surface flatness and roughness are verified to ensure proper O-ring sealing. The plating thickness is measured to confirm corrosion protection, and the coating is tested for adhesion and hardness. The O-rings are sampled for hardness, tensile strength, and compression set to guarantee long-term sealing performance.
The bolts are tested for tensile strength and hardness, and the entire assembly is subjected to a pressure test at 1.5 times the working pressure to verify leak-tightness. Each assembly is also visually inspected for surface defects, burrs, or irregularities that could compromise its function. Only products that pass all inspections are released for sale, providing customers with consistent quality and reliability.
With XCMG’s commitment to excellence, the 803378914 flange assembly delivers long-lasting performance in the most demanding conditions, reducing the total cost of ownership.
Installing the 803378914 flange assembly is a straightforward procedure that requires standard hand tools and a torque wrench. Begin by ensuring that the system pressure is relieved and the fluid is drained from the relevant circuit. Clean the mating surfaces of the pipe or component to remove any dirt, debris, or old seal material.
Position the new O-ring into the groove on the flange face, then align the flange with the port or tube end. Insert the four mounting bolts and tighten them gradually in a cross-pattern to achieve even compression of the O-ring. Torque the bolts to the recommended value of 35–40 N·m, using a calibrated torque wrench. If the flange is used with a mating component, ensure that both faces are parallel and free of nicks.
After installation, pressurize the system and check for leaks. If any leakage is detected, re-tighten the bolts slightly, but avoid over-torquing, which could damage the flange or O-ring. Periodically inspect the flange for signs of corrosion, cracking, or bolt loosening. When replacing the flange, always use new O-rings and bolts to ensure a proper seal. The flange itself is reusable if undamaged, but inspect the sealing surfaces for scratches or pitting.
Following these guidelines will ensure long-lasting, leak-free connections and extend the service life of your hydraulic system.
The 803378914 flange assembly is specifically designed for XCMG articulated dump trucks and matches the original equipment flange. It conforms to SAE J518 and ISO 6162 standards, ensuring interchangeability with other components that use these common flange dimensions and bolt patterns.
While optimized for XCMG, the flange may be compatible with other heavy machinery that uses the same SAE 1-inch flange interface. However, for guaranteed fit and performance, XCMG recommends using this part only on its intended models, as variations in port depth or bolt length may exist.
Fleet operators can consolidate inventory by stocking this flange for multiple DA-series trucks, as it is used across several models. Always verify the specific flange size and bolt pattern required for your application by consulting the vehicle’s parts manual or an XCMG dealer. Using genuine XCMG parts ensures optimal fit, function, and safety.
The part number 803378914 is a direct replacement for earlier versions and supersedes any previous revisions, ensuring you receive the latest design improvements.
Investing in the genuine XCMG 803378914 flange assembly is a cost-effective measure that prevents fluid leaks, which can lead to environmental penalties, fluid waste, and damage to other components. A single leak can cause hydraulic oil loss, leading to system cavitation, pump failure, and costly repairs—far exceeding the price of a new flange.
Compared to generic flanges, the XCMG assembly offers superior material quality and precision machining, ensuring a reliable seal and longer service life. The included high-grade bolts and O-ring eliminate the need for separate sourcing, reducing procurement complexity and potential mismatches. The corrosion-resistant coating also extends the flange’s life in harsh environments, reducing replacement frequency.
By maintaining leak-free connections, the flange helps preserve hydraulic fluid cleanliness, reducing contamination and extending the life of pumps, valves, and actuators. This translates into lower maintenance costs, reduced downtime, and higher productivity. The improved efficiency also contributes to fuel savings and lower total cost of ownership.
Choosing XCMG genuine parts is a wise long-term investment that maximizes fleet uptime and profitability.
The XCMG 803378914 flange assembly is a high-quality, reliable component that ensures leak-free, secure connections in the hydraulic systems of articulated dump trucks. Its forged steel construction, corrosion-resistant finish, and precision sealing make it an essential part for maintaining machine integrity and safety.
By choosing this genuine OEM part, you guarantee a perfect fit, consistent performance, and long service life. The flange’s ability to withstand extreme pressures, temperatures, and harsh environments reduces downtime and lowers maintenance costs, contributing to overall operational efficiency.
Don’t risk leaks or failures with substandard components. Equip your XCMG truck with the 803378914 flange assembly and experience the reliability that comes with genuine quality.
Keep your fleet operating safely and efficiently with XCMG genuine components. The 803378914 flange assembly is your guarantee of secure, leak-free connections for years to come.
Upgrade your maintenance inventory with the XCMG 803378914 flange assembly and ensure your articulated dump trucks remain in peak condition.
