In the routine maintenance and overhaul of the XCMG XE370C3 hydraulic excavator, the stick cylinder is one of the core actuators of the hydraulic system of the working device. As a 37-ton large mining excavator from XCMG, heavy-duty digging, material handling, and soil dumping all rely on the **803007120 stick cylinder** to output pulling force. Once the cylinder leaks oil, the piston rod is damaged, or there is internal leakage, the digging force of the entire machine will decrease significantly, and the project progress will be forced to stop. Part number 803007120 corresponds to the stick cylinder assembly of this model, which undertakes the key task of controlling the extension and retraction of the stick and transmitting digging force.
I. Basic Information and Applicable Models of Stick Cylinder 803007120
803007120 is the part number for the boom cylinder clearly marked in XCMG’s original parts catalog, applicable to the XE370CA and XE370C3 hydraulic excavators. This cylinder is a component of the hydraulic system’s working device; its exact location and quantity information can be found in the hydraulic system section of the parts catalog.
Based on the machine specifications, the XE370C3 has a total operating weight of approximately 36.6 tons, is equipped with an Isuzu AA-6HK1XQP engine, and features two piston pumps as the main pump, with a maximum system flow rate of 2×280 L/min. The xcmg excavator boom cylinder in this hydraulic system is responsible for outputting the boom digging force; according to the publicly available specifications, the boom digging force is 174 kN, a figure that directly reflects the working capacity of the boom cylinder.
II. Structural and Technological Characteristics of the 803007120 Bucket Cylinder
The boom cylinder on excavator assembly consists of components such as cylinder barrel, piston rod, piston, guide sleeve, sealing components, and hinge point bushing. The 803007120 cylinder-Xcmg Excavatorparts uses a forged cylinder barrel with precision honing of the inner wall, resulting in a high surface finish, reducing seal wear, and lowering the risk of internal leakage. (XCMG Group)
The piston rod is made of high-strength alloy steel, which undergoes tempering and surface hardening, and the surface is electroplated, making it impact-resistant and corrosion-resistant, suitable for dusty and sandy mining environments. Under continuous impact loads, the piston rod is less prone to common failures such as plating peeling and scoring.
The entire sealing system uses high-temperature resistant and anti-aging seals, which can withstand the rise in hydraulic oil temperature caused by long-term continuous operation, reducing oil seepage and external leakage at high temperatures. Built-in self-lubricating bushings reduce the coefficient of friction at hinge points, reduce wear on pins and bushings, extend cylinder maintenance cycles, and reduce maintenance costs associated with frequent oil seal replacements. Before leaving the factory, the cylinders undergo pressure testing to simulate the rated working pressure of the entire machine, checking for leaks, creeping, abnormal noises, and other problems to ensure the quality of the delivered assembly.
III. Functional Positioning of the Stick Cylinder 803007120
In the excavator’s working device, the boom cylinder controls the raising and lowering of the boom, the bucket cylinder-Xcmg Excavator Spare Parts controls the tilting of the bucket, and the stick cylinder drives the stick to rotate around the boom hinge point, realizing the most frequent “pull-bucket” action in excavation operations. The performance of the stick cylinder directly affects:
Digging force transmission efficiency: Internal leakage in the hydraulic cylinder will cause the stick to move weakly, affecting digging efficiency;
Operational accuracy: Seal failure may cause movement drift, making it difficult to accurately control the boom position;
Hydraulic system stability: Abnormalities in the hydraulic cylinder will exacerbate the load fluctuations of the main pump.
As the original factory designated xcmg part number, 803007120 is factory-calibrated to match the hydraulic system parameters (such as pressure rating and flow rate) of the XE370C3 cylinder boom excavator, and is consistent with the overall machine design in terms of installation dimensions, interface specifications and performance.
IV. Key Points for Installation, Use, and Maintenance of Stick Cylinder 803007120
Routine maintenance tips: Regularly check the dust seal and clean the piston rod surface of mud, sand, and gravel; monitor the cleanliness of the hydraulic oil, as dirty hydraulic oil is the primary cause of wear on cylinder seals; avoid prolonged forced digging of overloaded materials to reduce cylinder impact load; pay attention to the hydraulic oil temperature under high-temperature conditions, as prolonged exposure to excessive oil temperature will accelerate seal aging and shorten cylinder lifespan.
Strict adherence to safety guidelines during disassembly and assembly is essential. Before replacing the excavator bucket cylinder-Xcmg Excavatorparts, fully extend the stick and lower the bucket to the ground. After turning off the engine, repeatedly operate the control lever to release residual pressure in the pipeline. Immediately after disconnecting the hydraulic lines, install the plug to prevent dust and impurities from entering the hydraulic system. Due to the significant weight of the stick cylinder, appropriate lifting equipment must be used during disassembly and assembly. Never insert your fingers into the pin holes for alignment.
The venting process after installation is essential. After the hydraulic cylinder is installed, it is necessary to vent the air, confirm the hydraulic oil level is normal, and check all connections for leaks. Ignoring venting may cause the cylinder to crawl or produce abnormal noise.
803007120 is the xcmg part number for the boom cylinder of the XCMG XE370C3 excavator. As an actuator of the boom in this 37-ton large excavator, it withstands high-frequency impact loads in mining and earthmoving projects. When maintaining equipment and purchasing spare parts, adhering to a dual matching principle of “machine model + part number” is crucial for selecting the correct replacement. Using boom cylinders that meet original factory specifications reduces malfunctions such as oil leaks and insufficient digging power, minimizes downtime, improves the overall uptime of the XCMG XE370C3, and saves on maintenance costs for engineering projects.
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Post time: Sep-25-2026