K9000241 Heavy-Duty PU Piston Rod Seal for Excavator Hydraulic Cylinder Repair MEGA 250-V MEGA 400-V

1. Quick Details of  seal K9000241:

2. K9000241 parts on group :

3.  K9000241 picture:

4. Service part number :

 
5. FAQ

Q: What type of excavators and hydraulic cylinders is this K9000241 rod seal compatible with?
A: This K9000241 piston rod seal is engineered for Doosan/Daewoo excavators, widely fitting models like Solar 130LC-V, 150LC-7, 170W-V, 220LC-9E and related variants. It is primarily used in boom, arm, and bucket hydraulic cylinders with standard rod diameters of 70–90mm. Designed as a universal aftermarket component, it also fits several other medium-sized excavator brands with matching cylinder specs. It is suitable for both new cylinder assembly and in-field replacement, ensuring consistent performance across different working conditions.

Q: Why choose PU material for the main seal, and what benefits does it bring compared to ordinary NBR seals?
A: We select high-grade PU as the main sealing material because excavator hydraulic systems operate under high pressure, frequent movement, and exposure to various oils. PU offers excellent wear resistance, high tensile strength, and superior hydrolysis stability that ordinary NBR cannot match. It can withstand continuous reciprocating motion at speeds up to 1.2m/s without premature wear or deformation. Unlike NBR, which hardens and cracks over time, PU maintains its elasticity even after thousands of hours of operation. It also provides better resistance to mineral oils, synthetic hydraulic fluids, and moderate temperature fluctuations, making it ideal for heavy-duty construction machinery.

Q: Can you describe the physical appearance, color, and structural features of this seal in detail?
A: The K9000241 piston rod seal features a symmetrical U-cup design with a smooth outer surface and precision-machined sealing lips. The main PU body is dark blue, which helps distinguish it from standard black NBR seals. The inner NBR support ring is solid black, providing structural rigidity and preventing the seal from collapsing under high pressure. The PTFE backup ring is white, located at the back of the main seal to prevent extrusion into the cylinder gap. The overall structure is compact, with consistent thickness and precise dimensions, ensuring easy installation and perfect fit into standard seal grooves.

Q: What are the specific technical specifications, such as pressure resistance, temperature range, and service life?
A: This heavy-duty rod seal is built for extreme working conditions. Its maximum working pressure reaches 420 bar, making it suitable for high-pressure hydraulic systems. The operating temperature range is -35°C to +110°C, covering both cold winter construction and high-temperature summer environments. Under normal medium-load conditions, the service life can reach 5000–7000 working hours. Even in harsh environments with heavy dust, frequent impact loads, or continuous high-temperature operation, it can still achieve 3000–4000 working hours, which is 30–50% longer than ordinary seals.

Q: What common failures will occur if using low-quality rod seals, and how does this K9000241 avoid these problems?
A: Low-quality seals often use recycled rubber or inferior PU materials, leading to many issues. They tend to leak oil after a short period due to poor sealing lip precision. Under high pressure, they may extrude or deform, causing complete seal failure. They also age quickly, becoming brittle and cracking under temperature changes. In contrast, K9000241 uses virgin PU material with strict quality control. Its symmetrical U-cup design provides uniform pressure distribution. The PTFE backup ring prevents extrusion. The high-quality material resists aging and maintains elasticity, effectively avoiding common failures and reducing maintenance costs.

6. Exhibition and Wearhous

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