Product Overview

This is a genuine-quality replacement Flywheel Gear, part number YM129900-21600, engineered for the Yanmar 4TNV94 diesel engine. Designed to meet or exceed OEM specifications, this critical component ensures reliable engine starting and smooth operation. We supply this part globally to major industrial markets, supporting construction, agriculture, power generation, marine, and material handling sectors with dependable aftermarket solutions.

Key Features & Benefits

• Precision Engineered: Manufactured to exact OEM dimensions and tolerances for a perfect fit and seamless integration with your Yanmar 4TNV94 engine.
• Enhanced Durability: Made from high-grade materials to withstand the high-stress demands of diesel engine operation, ensuring long service life and resistance to wear.
• Reliable Engine Starting: Features precisely cut teeth for smooth and consistent engagement with the starter motor, guaranteeing dependable engine starts every time.
• Rigorous Quality Control: Each part undergoes thorough inspection and testing, including video outgoing-inspection, to confirm performance and dimensional accuracy before shipment.
• Global Compliance Ready: Packaged and documented for international trade, facilitating smooth customs clearance and delivery to your location.

Technical Specifications

OEM Cross-Reference

This flywheel gear is a direct replacement for the following OEM part number:

• Yanmar: YM129900-21600

Note: Always verify the part number stamped on your original component or consult your engine manual before purchase to ensure correct fitment.

Compatibility

This flywheel gear is specifically designed for use with the Yanmar 4TNV94 diesel engine. This engine platform is widely used in a diverse range of machinery, including:

• Construction Equipment: Excavators, wheel loaders, compactors.
• Agricultural Machinery: Tractors, combine harvesters, irrigation pumps.
• Power Generation: Industrial and standby generator sets (Gensets).
• Marine Applications: Auxiliary engines and small marine propulsion systems.
• Material Handling: Forklifts and terminal tractors.

Global Supply & Distribution

We are a trusted supplier for B2B clients worldwide, specializing in efficient international logistics for automotive and industrial engine parts.

• Worldwide Shipping: We export to all major markets, including North America (USA, Canada, Mexico), Europe (UK, Germany, France, Italy), Asia-Pacific (Australia, Japan, Singapore), the Middle East (UAE, Saudi Arabia), and South America.
• Fast Delivery Network: Consolidated shipments and established freight partnerships ensure timely delivery to major ports and industrial hubs globally.
• Export Expertise: All documentation (commercial invoice, packing list, certificate of origin) is provided professionally to comply with international trade regulations and ensure smooth customs processing.

Quality Assurance

Our commitment to quality ensures you receive a reliable and performance-matched component.

• Manufacturing Standards: Produced in ISO-certified facilities using precision machining to replicate OEM geometry and metallurgical properties.
• Comprehensive Warranty: Backed by a 6-month warranty against manufacturing defects, providing peace of mind with your purchase.
• Stringent Testing: Every batch is subject to machinery test reports and 100% video outgoing-inspection to verify critical dimensions, tooth profile, and material integrity.
• After-Sales Support: Online technical support is available for installation guidance and post-warranty service inquiries.

FAQ

Q1: How can I confirm this flywheel gear will fit my specific Yanmar 4TNV94 engine?
A1: The primary identifier is the OEM part number. Please locate the part number on your original flywheel gear (typically stamped on the face or rim) and verify it matches YM129900-21600. You can also cross-reference your engine’s serial number and model with our compatibility list or contact our support team with your equipment details for confirmation.

Q2: What is involved in replacing the flywheel ring gear?
A2: Replacement requires removing the transmission (if equipped) and the flywheel itself from the engine crankshaft. The old ring gear is typically removed by heating (to expand it) or cutting, and the new gear is installed by heating it uniformly and pressing it onto the flywheel, allowing it to shrink-fit as it cools. This procedure requires proper tools and mechanical expertise. We recommend consulting a professional service manual or a qualified technician.

Q3: Do you provide the machinery test report mentioned in the specifications?
A3: Yes. A machinery test report for the production batch is available upon request for B2B clients. This document details the quality checks and measurements performed, ensuring the part meets the required specifications. Please contact our sales team to request a copy relevant to your order.

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 .