294000-0390 Re522595 HP3 Common Rail Pump Fuel Injection Pump Assy for John Dee-re Tractor S350 Diesel Engine

This industrial-grade heavy-duty diesel engine high-pressure common rail oil pump (OE No.: 294000-0390) is a high-performance oil delivery and pressurization center specifically designed for commercial heavy-duty and harsh operating environments. This product is perfectly compatible with mainstream high-pressure common rail diesel engines such as the HINO J08E and is widely used in Hino 500 series heavy-duty trucks, urban public transport buses, and core large-tonnage hydraulic excavators and construction machinery such as the Kobelco SK330-8 and SK350-8.

This oil pump is developed around the core concept of "precise throttling and instantaneous pressure stabilization." Its friction pairs utilize a cutting-edge carbonitriding alloy hardening process, significantly improving wear resistance and corrosion resistance under complex, low-lubrication oil conditions. After replacing the pump with this new high-pressure oil pump, the operator will immediately notice a crisper and more precise engine ignition and start-up, and the rough vibrations at low idle speeds will be completely eliminated. When heavy trucks are fully loaded and climbing hills, or excavators are continuously loading at full power, the oil pump, thanks to the sensitive flow regulation of the electronically controlled SCV valve, can continuously supply high-pressure fuel with excellent atomization. This completely eliminates the power instability, sudden stalling, and lack of power caused by pressure loss due to worn-out parts, allowing your engine to regain its exhilarating output.

• Self-operated manufacturing plant, direct sourcing, eliminating the multi-layered markups of cross-border distribution: Addressing the high prices of original equipment manufacturer (OEM) power spare parts for heavy machinery and commercial vehicles, and the fact that overseas cross-border trade networks cause terminal prices to multiply, we rely on our own production base for independent direct sales. This flat supply chain directly eliminates all middlemen's profit sharing for end-user fleets and independent repair shops, ensuring your fleet maintenance with highly competitive factory costs and significantly reducing financial pressure.
• Massive, Dedicated Inventory Warehouse to Prevent Losses Due to Downtime and Parts Shortages: Heavy excavators and trucks are high-value, high-attendance commercial assets. If a high-pressure oil pump fails and causes equipment breakdown, it will result in significant daily downtime costs and contractual liabilities. Therefore, we implement high-risk, dynamic inventory management for these popular models. With ample stock in our warehouse, orders can be packed and shipped within 24-48 hours, using rapid international logistics to help your machinery quickly return to operation.
• 100% Digital, Full-Simulation, Rigorous Quality Inspection to Eliminate Quality Risks of Defective Products Reaching the Market: Addressing common quality issues in inferior small-factory oil pumps, such as poor internal high-pressure airtightness, SCV control valve malfunction, and high-pressure internal leakage, every high-pressure oil pump we manufacture undergoes a high-precision automated testing bench before leaving the factory. Under 100% simulated high-load and ultra-high-pressure operating conditions, the oil pump's pumping efficiency, return oil volume, and SCV control accuracy are verified point by point to ensure that every product delivered to you is a flawless masterpiece.

• Heavy-dust mining construction and large-scale earthwork excavation operations: In open-pit mines or large-scale foundation construction sites where dust obscures the sky and the working environment is extremely harsh, the Kobelco SK350-8 heavy-duty hydraulic excavator equipped with the J08E engine is at full power, grabbing hard rock layers and loading heavy loads onto trucks. As hydraulic resistance surges to the system redline, the 294000-0390 high-pressure fuel pump, with its excellent SCV valve metering and rail pressure build-up speed, continuously outputs stable high-pressure fuel, ensuring smooth and continuous operation of the excavator under low-speed, high-load conditions, preventing stalling or engine interruption.
• Intercity Fully Loaded Freight and Mountainous Continuous Steep Slope Transport Conditions: Hino 500 series heavy-duty dump trucks, fully loaded with large-tonnage construction materials or high-value goods, are traveling on inter-provincial trunk roads and continuous mountain roads. Facing long-distance driving and heavy-load climbing conditions, the driver adjusts gears by pressing the accelerator. The high-pressure fuel pump, with its excellent pressure stability and rapid response, ensures that every drop of diesel fuel is fully atomized and combusted in the cylinder, maintaining ample climbing power while significantly improving exhaust smoke and effectively locking in energy consumption.

Q: Why are your direct-sale products so affordable? Are they refurbished or brand new?

A: The high-pressure oil pump sold on our independent website is a 100% brand-new, high-quality replacement part, not a second-hand, recycled, or refurbished component. Because we operate our own factory directly online, shipping goods directly from our workshop warehouse to end users worldwide, we eliminate the commissions and expenses of multiple layers of distributors and physical stores, allowing us to pass on the true factory profits to you.

Q: My excavator at the construction site is broken down due to a damaged oil pump. How long will it take to ship my order?

A: We are well aware of the significant downtime and losses caused by heavy machinery downtime. This model is part of our core best-selling series, and our modern warehouse maintains ample stock year-round. Normally, after you complete payment for your order on a business day, the goods will be checked, shipped, and dispatched within 24 to 48 hours. With international express delivery, delivery typically takes 5-9 business days.

Q: What installation procedures require special attention when replacing this high-pressure common rail oil pump?

A: Modern diesel common rail systems are extremely precise, with zero tolerance for even the smallest metal shavings or dust impurities. Before installing a new fuel pump, please ensure your technician thoroughly cleans the original vehicle's diesel tank, common rail, and all low-pressure and high-pressure fuel lines. A brand new, genuine diesel fuel filter must also be installed. Ensuring a clean fuel system is a prerequisite for maximizing the new pump's performance.

Q: What if I find I bought the wrong model when checking the specifications, or encounter performance issues during subsequent use? What kind of guarantee do you provide?

A: As long as the product has not been opened or tested, its appearance and accessories are intact, and it does not affect our resale, we offer a 90-day return and exchange guarantee. Furthermore, this brand new fuel pump enjoys an extended 12-month warranty. If any quality malfunctions occur that are not caused by human error or contamination by inferior diesel fuel, our after-sales customer service team will provide you with technical analysis or free replacement service immediately.