Fuel Injector 26993 RE31757 RE37503 for 2140/2555 Diesel Engine Parts

Product Description

This heavy-duty diesel pencil-type fuel injection valve assembly (Part ID: 26993; common OE cross-references include RE37503, SE500822, 26993DR, etc.) is precision-engineered. It is designed primarily for the 300 Series diesel engine platforms (including 4.239T, 6.359T, and 6.359A turbocharged/intercooled models) and is widely used in equipment such as 344E/444E/544E series wheel loaders, 570B motor graders, 590D/595D series crawler excavators, 540 series agricultural tractors, and related diesel generator sets. As a core component of the mechanical high-pressure injection system—responsible for controlling diesel atomization quality and injection timing—it precisely meters fuel and breaks it down into ultra-fine particles under high-pressure pump strokes, facilitating thorough mixing and combustion with intake air.

The component is designed and manufactured to meet rigorous standards for high-precision fit, wear resistance, and high-pressure durability. The core needle valve assembly and valve body are crafted from high-hardness, quenched special alloy steel, featuring ultra-precise geometric grinding and low-friction polishing. The surface is treated with a dense, ultra-hard coating to effectively prevent internal scratching and pressure loss caused by fuel impurities. Upon installation, operators and technicians will notice immediate improvements: crisp, reliable cold starts and quiet, vibration-free idling. Under heavy loads, frequent stop-and-go operations, or long-distance cruising, the throttle response is sharp and sensitive, and torque delivery is robust and smooth. Additionally, black smoke emissions are reduced, resulting in superior fuel efficiency and a smooth, satisfying operating experience.

Product Advantages

Cost-Effective Sourcing by Eliminating Intermediaries:

Standardized, intelligent manufacturing and quality control directly from the source factory. We effectively reduce procurement costs by bypassing middlemen—whose involvement often leads to issues such as out-of-tolerance fitment, uneven fuel delivery across cylinders, and high-pressure leakage risks. By leveraging standardized production bases for end-to-end quality control and removing unnecessary markups, we ensure highly consistent fuel injection pressure and flow rates across all cylinders, providing reliable power for vehicle and equipment operations while simultaneously cutting maintenance budgets.

Rigorous Testing on Ultra-High-Pressure Digital Dynamic Test Benches:

We address common problems associated with low-quality replacements—such as response lag, pressure-relief valve sticking (causing engine misfires and vibration), and wasted labor/costs from repeated installation and adjustment. Every injection assembly undergoes automated testing before leaving the factory; flow rates and sealing integrity are precisely calibrated across various pressure ranges in environments simulating real-world high-temperature, ultra-high-pressure conditions. This ensures "ready-to-install" performance, drastically saving time and costs associated with equipment installation and tuning.

Large-Scale Warehousing and Rapid Shipping:

We recognize that operational and engineering equipment are high-utilization assets where fuel system failures lead to costly downtime and financial losses. Our warehouse maintains ample stock year-round; orders are packed and shipped within 24–48 hours of confirmation. This significantly shortens logistics lead times, helping fleet operators and equipment owners quickly restore operations and avoid losses caused by equipment inactivity.

Special Quenched Alloy Needle Valves with Wear-Resistant Hardened Coatings:

We tackle issues caused by poor diesel lubricity and sulfur impurities, which often lead to premature wear and valve-core seizing in precision components. Our core components utilize high-hardness special bearing steel and advanced anti-corrosion surface treatments. This results in superior fatigue and wear resistance, ensuring stable performance even under harsh conditions and prolonged, high-load operation, thereby reducing the extra expenses associated with frequent repairs.

Specifications Table

Application Scenarios

Agricultural Tillage and Tractor Operations: Wheeled tractors operating under high loads for extended periods during deep plowing, seeding, and land leveling. Maintenance technicians install this injector assembly when equipment exhibits slow starting, severe idle vibration, or power loss under load. Precise fuel atomization enables the engine to deliver robust torque at low RPMs, ensuring stable performance during demanding heavy-load operations. Open-pit mining and earthmoving scenarios: Crawler excavators, wheel loaders, and motor graders operate continuously in mines and at construction sites, often facing prolonged heavy-load conditions and high-dust environments. When equipment experiences sluggish acceleration, stalling under load, or a noticeable increase in black exhaust smoke, technicians can promptly install this pencil-type fuel injector assembly; its robust and stable fuel supply ensures construction projects are completed on schedule and efficiently.

Frequently Asked Questions

Q: Can the product be used immediately after installation? Is complex calibration required?

A: Each fuel injector undergoes full-range operational parameter calibration during factory testing. Provided the fuel lines are clean and new gaskets are used, the unit can be put into service immediately after installation by a professional technician using standard torque specifications and proper air-purging procedures.

Q: What are the stock levels and shipping lead times for bulk orders?

A: We operate our own factory and large-scale warehouses, maintaining substantial, year-round inventory for this model. Standard orders are typically packed and shipped within 24–48 hours, while bulk orders can be quickly scheduled for production.

Q: How are product quality and performance ensured before shipment?

A: All fuel injectors are assembled in a Class 100 cleanroom environment and undergo 100% full-range bench testing. We verify critical metrics such as sealing integrity, opening pressure, injection flow rate, and fuel return volume; our rigorous testing standards ensure that every unit shipped is a high-quality product.

Q: What is the warranty period, and how is after-sales support handled?

A: We offer a 12-month warranty. Should a performance failure occur due to non-human factors during the warranty period, we provide rapid replacement or technical support to ensure you have complete peace of mind.