Product Overview

This high-quality Fuel Injection Pump Plunger and Barrel Assembly, model A771 (OEM 131153-9220), is a direct replacement component designed for Caterpillar 320 excavators and other heavy machinery powered by 6AD/105L and S6K-T diesel engines. Manufactured in our ISO-compliant facility in Shandong, China, this new plunger and barrel set is engineered to restore precise fuel metering, optimize combustion, and reduce emissions. We ship globally to major markets including North America, Europe, Southeast Asia, and the Middle East, ensuring reliable supply for equipment dealers, fleet operators, and service workshops.

Key Features & Benefits

• Precision Engineering: Manufactured from high-speed steel for superior wear resistance and dimensional stability under high-pressure injection conditions.
• 100% Professional Tested: Each unit undergoes rigorous pressure and flow testing to guarantee leak-proof performance and exact OE specifications.
• Restored Engine Performance: Directly addresses hard starting, low power, black smoke, and rough idling by restoring the fuel pump’s internal sealing and pressure.
• Long Service Life: Advanced hardening processes ensure a lifespan comparable to or exceeding original parts, reducing downtime and maintenance frequency.
• Standard Fitment: Standard size design ensures compatibility with existing pump housings without the need for re-machining.

Technical Specifications

OEM Cross-Reference

This A771 plunger and barrel assembly is a direct replacement for the following OEM part numbers:

• 131153-9220 (Primary OEM)
• A771 (Bosch/Zexel style reference)

Note: Always verify your pump model (e.g., AD pump type) and current part number before ordering to ensure correct fitment.

Compatibility

• Engine Models:
  • 6AD/105L
  • S6K-T
• Vehicle/Equipment Applications:
  • Caterpillar 320 Excavator
  • Other heavy equipment using the above engine platforms

Global Supply & Distribution

• Worldwide Shipping: We offer fast, reliable shipping via DHL, FedEx, UPS, and sea freight to all major global ports.
• Major Markets Served: North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands), Asia-Pacific (Australia, Japan, Korea), Middle East (UAE, Saudi Arabia), and Africa.
• Fast Delivery: Standard lead time is 3-7 days for in-stock items. Bulk orders via sea freight are dispatched weekly to major ports like Shanghai, Qingdao, and Ningbo.
• Export Expertise: We specialize in B2B international trade, handling all customs documentation and compliance requirements for smooth importation.

Quality Assurance

• Manufacturing Standards: Produced in a facility adhering to ISO quality management principles, using precision grinding and lapping processes.
• 100% Professional Test: Every plunger and barrel set is individually tested for hydraulic seal, sliding clearance, and surface finish.
• Warranty: Backed by a 6-month warranty against manufacturing defects in materials and workmanship.

FAQ

Q1: How do I know if this A771 plunger is the correct replacement for my fuel pump?
A: This part is designed for AD-series injection pumps commonly found on CAT 320 excavators with 6AD/105L or S6K-T engines. Please check your current plunger for the marking “A771” or the OEM number 131153-9220. If your pump is a different series (e.g., P, PE, or ZEXEL), it will not fit.

Q2: What are the signs that my plunger and barrel assembly needs replacement?
A: Common symptoms include: difficulty starting the engine, excessive black or white smoke, uneven engine running (misfire), loss of power under load, and fuel leakage from the pump body. A failed plunger cannot maintain the high pressures required for proper injector atomization.

Q3: Do I need to replace the delivery valve or other pump components at the same time?
A: While not mandatory, it is a best practice to replace the delivery valve assembly and the pump’s internal seals (O-rings/gaskets) when replacing the plunger and barrel. This ensures complete pump performance and prevents future contamination or leaks. We recommend consulting your service manual.

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 .