Product Overview

This high-quality AD Type Plunger Barrel Assembly, identified by OEM numbers A831 and 131150-4320, is a critical component for the fuel injection system of Hitachi excavators. Designed as a direct replacement for models like the Hitachi EX200-5, EX230, and EX240, this plunger ensures precise fuel metering and reliable engine performance. We are a professional supplier based in Shandong, China, offering global shipping to major industrial markets including North America, Europe, Southeast Asia, the Middle East, and Australia. Our stock ensures fast dispatch to ports and industrial centers worldwide.

Key Features & Benefits

• Precision Engineering: Manufactured from high-grade chrome steel for exceptional wear resistance and long service life under high-pressure conditions.
• OEM Standard Fitment: Manufactured to meet or exceed original equipment specifications for a perfect, hassle-free installation.
• Enhanced Fuel Efficiency: The precise machining of the plunger and barrel ensures optimal fuel atomization and combustion, reducing fuel consumption.
• Reliable Performance: Rigorously tested to ensure consistent fuel delivery and stable engine idling, even in demanding work environments.
• Cost-Effective Solution: A reliable aftermarket alternative to expensive dealer parts, offering excellent value without compromising on quality.

Technical Specifications

OEM Cross-Reference

This plunger assembly is a direct replacement for the following original equipment manufacturer numbers:

• A831
• 131150-4320

Note: This part is an AD Type plunger. Please verify your existing part number against the list above before purchasing.

Compatibility

This AD Type plunger is designed for diesel engines commonly found in the following Hitachi excavator models:

• Hitachi EX200-5
• Hitachi EX230
• Hitachi EX240
• Hitachi EX200

Engine Application: Designed for use in Isuzu and other diesel engines powering these excavator models. Always cross-reference your engine model and pump type (AD Type) to ensure correct fitment.

Global Supply & Distribution

We are a dedicated supplier to the global aftermarket, offering efficient logistics and shipping solutions. Our distribution network covers:

• North America: Fast delivery to major ports like Los Angeles, Houston, and New York.
• Europe: Reliable shipping to Rotterdam, Hamburg, and other key industrial hubs.
• Asia-Pacific: Direct supply to markets in Japan, Korea, Australia, and Southeast Asia.
• Middle East & Africa: Serving major centers like Dubai, Jeddah, and Durban.

With years of export experience, we ensure professional packaging and full compliance with international trade regulations.

Quality Assurance

Every plunger barrel assembly undergoes strict quality control checks during production. Our manufacturing process adheres to high industry standards to ensure dimensional accuracy, material integrity, and surface finish. This product is backed by a 4-month warranty against manufacturing defects.

FAQ

Q1: How do I confirm that this A831/131150-4320 plunger will fit my Hitachi EX200-5 pump?

First, visually inspect your fuel injection pump to ensure it is an “AD Type” pump. Second, check the part number stamped on the existing plunger. If it matches A831 or 131150-4320, this part is a direct fit. If you are unsure, please contact us with your pump model and machine serial number for verification.

Q2: What is the recommended installation procedure for this plunger assembly?

Installation should be performed by a qualified diesel technician. The work area must be extremely clean to prevent contamination. Lubricate the plunger with clean diesel fuel or engine oil before insertion. Do not force the plunger into the barrel. Ensure the alignment mark on the plunger matches the pump housing. After installation, bleed the fuel system to remove any air before starting the engine.

Q3: What is the typical lifespan of this plunger, and how can I maximize it?

The lifespan depends on fuel quality and operating conditions. Using clean, high-quality diesel fuel and changing your fuel filters regularly are the best ways to maximize the life of the plunger assembly. Water and abrasive particles in the fuel are the primary causes of premature wear. This part is made of high-grade chrome steel for enhanced durability.