Product Overview

This high-quality injection pump head rotor (models HX.4 and HX.5) is a direct replacement component designed for Yanmar industrial diesel engines. Manufactured in Shandong, China, this part is essential for restoring precise fuel delivery and pressure in your engine’s fuel injection system. We ship globally to major industrial hubs across North America, Europe, Asia-Pacific, the Middle East, and Africa, ensuring fast and reliable delivery for your repair or replacement needs.

Key Features & Benefits

• Precision Engineering: Manufactured to exact OEM specifications for a perfect fit and optimal fuel metering.
• Enhanced Durability: Constructed from high-grade, wear-resistant materials to withstand high-pressure injection cycles and extend service life.
• Restored Engine Performance: Directly addresses common issues like hard starting, misfiring, and power loss caused by a worn pump head.
• Rigorous Testing: Each unit undergoes quality control checks to ensure reliable operation upon installation.
• Cost-Effective Solution: A reliable aftermarket alternative to expensive OEM parts, offering excellent value without compromising performance.

Technical Specifications

OEM Cross-Reference

This head rotor is designed to directly replace the following Yanmar OEM part numbers:

• HX.4 – (X4 Plunger Set)
• HX.5

Note: This is an aftermarket replacement part, not an original Yanmar part. Please verify your existing part number to ensure compatibility.

Compatibility

This head rotor is specifically designed for Yanmar industrial diesel engines, including the following models:

• 4TNE Series: 4TNE88, 4TNE94, 4TNE98
• 4TNV Series: 4TNV88, 4TNV94L, 4TNV98

These engines are commonly found in excavators, generators, agricultural tractors, and other heavy equipment. Always confirm your engine model and injection pump type before purchasing.

Global Supply & Distribution

We are an experienced exporter specializing in diesel engine components. Our distribution network ensures timely delivery to major ports and industrial centers worldwide.

• Markets Served: North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands, France), Asia-Pacific (Australia, Japan, South Korea), Middle East (UAE, Saudi Arabia), and Africa.
• Shipping: We offer fast and reliable shipping via air, sea, and express courier services. Bulk orders receive priority handling.
• Trade Compliance: We adhere to international trade standards and ensure proper documentation for customs clearance.

Quality Assurance

• Manufacturing Standards: Produced in ISO-certified facilities with strict quality control processes.
• Testing: Each rotor is tested for dimensional accuracy, material hardness, and hydraulic performance to ensure it meets OE standards.
• Warranty: We provide a 4-month warranty against manufacturing defects. Our professional service team is ready to assist with any inquiries.

FAQ

Q1: How do I confirm if the HX.4 or HX.5 rotor is the correct part for my pump?
A: You must first identify your injection pump model. The HX.4 and HX.5 rotors are specific to certain Yanmar inline pumps. Check the existing part number stamped on your pump’s head rotor or delivery valve holder. If your pump uses a 4-plunger rotor, it is likely the HX.4. The HX.5 is a different variant. We recommend removing the pump and visually comparing the old part to the images provided, or contacting us with your engine and pump model for verification.

Q2: What are the common symptoms of a worn injection pump head rotor?
A: A worn head rotor can cause several performance issues, including: difficulty starting the engine, irregular idling or “hunting,” a noticeable loss of engine power under load, black or white smoke from the exhaust due to incomplete combustion, and increased fuel consumption. If you experience these symptoms, replacing the head rotor and plunger set is a critical step in pump overhaul.

Q3: Is professional installation required for this part?
A: Yes, absolutely. Replacing the head rotor is a complex procedure that requires specialized tools and knowledge of diesel injection systems. The pump must be disassembled, cleaned, and recalibrated on a test bench after installation to ensure correct timing and fuel delivery. We strongly recommend that this repair be performed by a qualified diesel injection service technician. Improper installation can lead to severe engine damage.

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 .