318307471 transition joint assembly XCMG XE2000 excavator spare parts

XCMG XE2000 Excavator Transition Joint Assembly (318307471): A Reliable Connection Hub for Hydraulic Pipelines

In the hydraulic system of the XE2000 large mining excavator, the transition joint assembly is a key node connecting different pipelines and ensuring efficient hydraulic oil transmission. Its sealing performance and structural stability directly affect the operating efficiency and safety of the entire machine’s hydraulic system. The XCMG original transition joint assembly (part number: 318307471) is specially customized for this model. With its precise sealing structure, strong pressure resistance, and original factory precision fit, it becomes a reliable guarantee for hydraulic pipeline connections.

Precision Sealing Design, Eliminating Hydraulic Leakage Risks

The XE2000 excavator’s hydraulic system operates at pressures up to 35MPa. Any minor leak can lead to power loss, oil contamination, or even system failure. This transition joint assembly adopts a double-sealing structure design. The interface is equipped with a high-precision metal sealing surface and a high-pressure resistant O-ring (fluororubber material). Through a combination of conical and flat sealing, it achieves an absolute sealing effect. The connector threads are machined using a high-precision rolling process, combined with a special sealant coating, achieving a thread sealing accuracy of ISO 965-1 6g/6h standard. It maintains a reliable seal even under high-pressure hydraulic impact, effectively preventing leakage. High-pressure testing has verified that it can withstand continuous pressure at 40MPa water pressure for 1 hour without leakage, ensuring zero loss in hydraulic oil transmission.

Constructed with high-strength materials, it boasts excellent pressure resistance

Transition joints in hydraulic systems must withstand high-pressure impacts and vibration loads for extended periods, requiring stringent material strength. The 318307471 transition joint assembly is integrally forged from high-strength alloy structural steel (42CrMo), with a tensile strength ≥1080MPa and a yield strength ≥930MPa. After overall tempering heat treatment, its hardness reaches HRC28-32, exhibiting excellent fatigue resistance and impact toughness. Key load-bearing components have undergone structural optimization through finite element analysis, reducing stress concentration by 25%. This ensures no cracking or deformation under high-frequency vibration and instantaneous high-pressure conditions, with an overall pressure resistance exceeding 50MPa, far surpassing the system’s actual working pressure requirements and providing a robust guarantee for hydraulic pipeline connections.

Original factory precision fitting ensures seamless pipeline connections

As a core hydraulic component of the XE2000 excavator, the dimensions and connection methods of this transition joint assembly have been fully calibrated by the original factory. Considering the layout characteristics of the machine’s hydraulic pipelines, the nominal diameter, connection angle, thread specifications, and other parameters of the joint are strictly matched to the interface requirements of core components such as the main pump, main valve, and cylinder, ensuring seamless connection with pipelines of different diameters and materials. The installation position error of each joint in the assembly is ≤0.1mm. Special tooling assembly ensures overall coaxiality, avoiding additional stress after pipeline connection and effectively reducing early wear caused by uneven stress, ensuring a reasonable hydraulic system pipeline layout and minimal flow resistance. Precision Machining for Stable and Reliable Performance

The machining accuracy of the transition joint assembly directly affects the connection reliability and flow characteristics. This assembly is precision-manufactured using a multi-axis machining center, with a surface roughness of ≤Ra0.8μm and a flatness error of ≤0.01mm/100mm on the sealing surface, ensuring a tight seal. The inner bore is honed to a surface roughness of ≤Ra0.4μm, effectively reducing hydraulic oil flow resistance and pressure loss. All joints undergo 100% hydrostatic testing, magnetic particle inspection, and dimensional inspection to ensure the absence of defects such as sand holes and cracks. The performance consistency of each batch of products reaches over 99.5%, providing reliable support for the stable operation of the hydraulic system.

Full-Cycle Weather Resistance for Adapting to Extreme Environments

Dust, oil, humidity, and temperature fluctuations in the mining environment pose a challenge to the weather resistance of the transition joint. The 318307471 transition joint assembly features a multi-layer protective treatment: a bottom phosphate film enhances adhesion, a middle layer of electroplated hard chrome (≥15μm thickness) improves wear and corrosion resistance, and an outer layer of oil-resistant and rust-proof paint, achieving an overall salt spray resistance of over 720 hours. Within a temperature range of -30℃ to 120℃, material and sealing performance remain stable without change, preventing seal failure due to alternating hot and cold temperatures. Verified in actual mining conditions, after long-term operation in dusty and high-humidity environments, the joint showed no rust or blockage, ensuring hydraulic oil cleanliness and transmission efficiency.

The XCMG XE2000 excavator transition joint assembly (part number 318307471) – with its precision seal eliminating leakage risks, high-strength materials bearing high-pressure loads, and original equipment manufacturer (OEM) fitment for pipeline coordination, is an indispensable and reliable connection hub for the hydraulic system of large mining excavators.

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318307471 transition joint assembly

1 318811022 1 TRANSIT JOINT
2 803012821 1 CONNECTOR
3 803413396 1 CONNECTOR
4 803172014 1 CONNECTOR
5 803189850 1 PLUG

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