Yanmar 4TNV84 Alternator 12V 45A 129423-77200 for Excavator & Machinery Engine

Product Details

Product Overview

This high-quality Yanmar 4TNV84 Alternator (12V 45A) is a direct replacement for the OEM part number 129423-77200. Specifically engineered for the Yanmar 4TNV84 diesel engine, this alternator is critical for the electrical systems of compact excavators, agricultural tractors, and industrial machinery. We offer global shipping from our strategic warehouses, serving major B2B markets across North America, Europe, Asia-Pacific, and the Middle East, ensuring rapid delivery to ports and industrial hubs.

Key Features & Benefits

• OEM Standard Performance: Manufactured to meet or exceed OEM specifications for the 129423-77200, ensuring a perfect bolt-on fit and reliable 12V / 45A output.
• Durable Construction: Built with high-grade copper windings and sealed bearings to withstand the high vibration and harsh operating conditions of construction and agricultural environments.
• Enhanced Charging Stability: Features a robust voltage regulator that provides consistent power output, protecting sensitive ECUs and batteries from voltage spikes.
• Direct Fitment: Precisely machined mounting brackets and connector plugs match the original Yanmar 4TNV84 engine configuration, eliminating the need for modifications.

Technical Specifications

OEM Cross-Reference

This alternator is a direct replacement for the following OEM and cross-reference numbers:

• Yanmar: 129423-77200, 129423-77201
• Hitachi: (Used in Yanmar-powered excavators)
• John Deere: (If equipped with Yanmar 4TNV84)

Compatibility

• Engine Models: Yanmar 4TNV84, 4TNV84T (Turbo variants)
• Equipment Applications:
  • Yanmar B/Vio Series Mini Excavators (e.g., B25, Vio35, Vio50)
  • Yanmar YT Series Tractors
  • John Deere Compact Tractors (e.g., 1025R, 2025R with Yanmar engines)
  • Various Industrial Generators and Pumps powered by 4TNV84 engines
• Year Range: Compatible with models manufactured from 2005 onwards, depending on specific serial number.

Global Supply & Distribution

We maintain a robust global inventory to ensure fast, reliable delivery to B2B buyers worldwide. Our logistics network covers:

• North America: Express shipping to Houston, Los Angeles, Chicago, and Toronto.
• Europe: Fast delivery to Rotterdam, Hamburg, Antwerp, and Duisburg.
• Asia-Pacific: Direct shipping to Shanghai, Singapore, Tokyo, and Sydney.
• Middle East & Africa: Reliable service to Dubai, Jeddah, and Johannesburg.

We specialize in bulk orders for dealerships, repair shops, and equipment fleets, with full customs documentation and export compliance.

Quality Assurance

• Standards: Manufactured under ISO 9001:2015 certified facilities.
• Testing: Each unit undergoes 100% load testing, voltage output verification, and vibration stress testing before shipment.
• Warranty: Backed by a standard 12-month warranty against manufacturing defects. Extended warranty options available for bulk purchases.

FAQ

Q: Will this alternator fit my Yanmar Vio35 excavator?

A: Yes, this alternator (129423-77200) is the standard fitment for the Yanmar 4TNV84 engine used in Vio35 models. Ensure your engine serial number matches the 4TNV84 series. Check your old part number to confirm compatibility.

Q: My alternator is not charging. How do I test my new unit before installation?

A: Before installation, bench test the alternator by connecting the B+ terminal to a 12V battery positive and grounding the case. Briefly apply 12V to the L (Lamp) terminal; the alternator should spin freely and output voltage. Ensure all connections are clean and tight during installation to avoid voltage drops.

Q: What is the difference between the 129423-77200 and the 129423-77201?

A: The 129423-77201 is a superseded or updated version of the 129423-77200. Both are functionally identical in output (12V/45A) and physical mounting. The 129423-77200 is the original part number, while the 77201 may have minor internal component improvements. This unit is manufactured to meet both specifications and is a direct replacement for either number.