Product Overview

This high-performance Common Rail Fuel Injector (part numbers 557-7633 / 557-7634) is a precision-engineered replacement component designed specifically for Caterpillar (CAT) diesel engines. Manufactured to meet or exceed OEM specifications, this injector ensures optimal fuel atomization, improved combustion efficiency, and reliable engine performance. Sourced from a leading Chinese manufacturer with extensive export experience, we offer global shipping solutions to major industrial markets including North America, Europe, Southeast Asia, the Middle East, and South America. Whether you need fast delivery to Houston, Rotterdam, or Dubai, our logistics network ensures your parts arrive on schedule.

Key Features & Benefits

• Precision Fuel Delivery: Advanced common rail technology ensures precise injection timing and fuel metering for maximum power output and reduced emissions.
• Superior Durability: Constructed from high-speed steel with hardened internal components, designed to withstand extreme pressures and temperatures common in heavy-duty diesel operation.
• 100% Professional Testing: Each injector undergoes rigorous flow bench testing, pressure calibration, and leak checks to guarantee performance and reliability out of the box.
• Direct OEM Replacement: Exact fitment for CAT engine applications with matching dimensions, electrical specifications, and hydraulic characteristics.
• Cost-Effective Solution: Factory-direct pricing provides significant savings compared to genuine OEM parts while maintaining equivalent quality standards.

Technical Specifications

OEM Cross-Reference

This injector is a direct replacement for the following OEM part numbers:

• CAT OEM: 557-7633, 557-7634
• Alternative Formats: 5577633, 5577634

Note: Always verify compatibility with your engine’s serial number before purchase.

Compatibility

• Engine Applications: Caterpillar diesel engines equipped with common rail fuel systems.
• Vehicle Types: CAT excavators, wheel loaders, bulldozers, and other heavy equipment.
• Specific Models: Commonly used in C-series and 3000-series CAT engines. Consult your engine manual for exact fitment.

Global Supply & Distribution

• Worldwide Shipping: We ship to all major continents via DHL, FedEx, UPS, and sea freight.
• Key Markets: North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands, France), Asia-Pacific (Australia, Japan, Indonesia), Middle East (UAE, Saudi Arabia, Qatar), Africa (South Africa, Nigeria), and South America (Brazil, Chile, Argentina).
• Fast Delivery: Stock items dispatched within 24-48 hours. Express shipping to major hubs like Los Angeles, Rotterdam, Shanghai, and Dubai typically arrives in 5-7 business days.
• Trade Compliance: Experienced in international export documentation and customs clearance for hassle-free delivery.

Quality Assurance

• Manufacturing Standards: Produced in ISO 9001 certified facilities with strict quality control protocols.
• Testing: Every injector is flow-tested for spray pattern, pressure calibration, and leak integrity before packaging.
• Warranty: Backed by an 8-month warranty against manufacturing defects.
• Certifications: Complies with international standards for diesel fuel injection components.

FAQ

Q: Will this injector fit my CAT 320D excavator with a C6.6 engine?
A: The 557-7633/557-7634 injector is commonly used in several CAT engine platforms, including some C6.6 and C7.1 variants. However, we strongly recommend checking your engine’s serial number against CAT’s parts database or consulting your equipment manual to confirm compatibility, as injector specifications can vary by engine build date and emission tier.

Q: Do I need to program or calibrate this injector after installation?
A: This injector is pre-calibrated at the factory for standard CAT common rail systems. In most cases, it is a direct plug-and-play replacement. However, some newer electronic control systems may require an injector coding procedure using a diagnostic tool (e.g., CAT ET) to match the injector’s fuel quantity correction code to the ECU. We recommend professional installation by a qualified diesel technician.

Q: What is the typical lifespan of this injector under normal operating conditions?
A: With proper fuel filtration and maintenance, this injector can last 4,000-8,000 hours of operation. Factors that reduce lifespan include contaminated fuel (water, dirt), poor fuel quality, and extended service intervals. Regular fuel filter changes and using high-quality diesel fuel are essential for maximizing injector life. Our 8-month warranty covers manufacturing defects but not wear from contaminated fuel.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .