Yanmar KM4A Gear R 2.63 for 4JH5 – KM4AG-5

Description

Yanmar KM4A Gear R 2.63 for 4JH5 – KM4AG-5 For Sale

The Yanmar KM4A Gear R 2.63 for 4JH5 – KM4AG-5 is a genuine Yanmar marine transmission engineered specifically for selected Yanmar 4JH5 Series marine diesel engines. Featuring a 2.63:1 reduction ratio, this heavy-duty marine gearbox is designed to deliver exceptional propeller thrust, reliable power transmission, and superior low-speed maneuverability for cruising yachts, sailing vessels, trawlers, commercial boats, and marine repower projects.

As part of Yanmar’s proven KM4A transmission family, the KM4AG-5 is manufactured to integrate seamlessly with compatible 4JH5 engines, creating a highly efficient and dependable propulsion package. The higher reduction ratio allows larger propellers to operate at optimal efficiency while maximizing torque transfer to the water, making this gearbox an excellent choice for heavier displacement vessels and applications requiring increased thrust.

Whether you are replacing an aging transmission, upgrading your vessel’s drivetrain, or planning a complete propulsion system refit, the KM4AG-5 delivers the durability, reliability, and engineering excellence expected from a genuine Yanmar marine gearbox.

If you are searching for a Yanmar KM4AG-5 for sale, comparing Yanmar KM4AG-5 price options, looking for a reliable Yanmar gearbox for sale, or sourcing a genuine Yanmar marine transmission, Yanmar Marine Experts supplies factory-original Yanmar gearboxes backed by technical expertise and worldwide shipping support.

Technical Specifications

Compatible Engines

The Yanmar KM4AG-5 is designed for selected Yanmar 4JH5 Series marine diesel engines.

Common applications include:

Compatibility should always be confirmed before purchase. Our technical team can verify suitability using your engine model, serial number, gearbox identification plate, and vessel specifications.

Understanding the 2.63:1 Reduction Ratio

The 2.63:1 reduction ratio is specifically designed for vessels requiring enhanced propeller torque and increased thrust generation. By reducing propeller shaft speed relative to engine speed, the gearbox allows the installation of larger diameter propellers capable of moving more water with greater efficiency.

Benefits of the 2.63:1 ratio include:

• Increased propeller thrust
• Enhanced low-speed maneuverability
• Superior docking control
• Improved performance under load
• Better fuel efficiency at cruising speeds
• Reduced engine strain
• Optimized propulsion efficiency

For many displacement hulls, offshore cruising yachts, and commercial vessels, the 2.63:1 ratio provides an excellent balance between power delivery and operational efficiency.

Designed for Yanmar 4JH5 Marine Engines

The Yanmar 4JH5 Series is one of the most widely respected marine diesel engine platforms available today. Renowned for reliability, fuel efficiency, and smooth operation, these engines are commonly found in sailboats, trawlers, cruising yachts, and commercial vessels worldwide.

The KM4AG-5 has been engineered to complement these engines by providing reliable power transfer and smooth drivetrain performance throughout the operating range.

As part of a complete Yanmar propulsion system, the gearbox contributes to:

• Efficient power transmission
• Reduced drivetrain losses
• Smooth forward and reverse engagement
• Reliable vessel handling
• Long service life
• Dependable cruising performance

For customers researching a Yanmar 4JH45 for sale, comparing Yanmar 4JH57 price options, evaluating a Yanmar 4JH80 for sale package, or sourcing a Yanmar 4JH110 for sale, selecting the correct transmission ratio is essential for maximizing vessel performance.

Built for Marine Reliability

Marine transmissions operate in demanding conditions where reliability is critical. The KM4AG-5 is built to withstand continuous operation while maintaining smooth and dependable performance.

Advantages of the KM4A gearbox design include:

• Proven marine transmission technology
• Reliable clutch engagement
• Robust internal gearing
• Long service intervals
• Compact installation footprint
• Excellent durability in marine environments

These qualities make the KM4AG-5 a trusted commercial marine gearbox and a popular choice among professional boatbuilders, marine engineers, and vessel owners worldwide.

Why Choose a Genuine Yanmar Gearbox?

Choosing a genuine Yanmar gearbox helps ensure complete compatibility between your engine, controls, propeller shaft, and propulsion system.

Benefits include:

• Factory-engineered compatibility
• Genuine Yanmar manufacturing standards
• Manufacturer warranty support
• Long-term replacement parts availability
• Reliable performance in demanding environments
• Lower lifetime ownership costs

For vessel owners investing in a replacement Yanmar gearbox, a marine repower gearbox, or a complete propulsion upgrade, genuine Yanmar components help maintain the integrity and reliability of the entire drivetrain.

Common Applications

The Yanmar KM4AG-5 is commonly used in:

• Cruising yachts
• Offshore sailing vessels
• Trawlers
• Commercial workboats
• Charter vessels
• Marine repower projects
• Transmission replacement projects

For operators searching for a dependable boat transmission for sale, the KM4AG-5 remains one of the most trusted options within the Yanmar gearbox lineup.

Support from Yanmar Marine Experts

Yanmar Marine Experts specializes exclusively in Yanmar propulsion equipment, including marine gearboxes, saildrives, diesel engines, and genuine replacement parts.

Our team assists customers with:

• Product selection
• Gearbox compatibility verification
• Ratio selection guidance
• Propulsion system planning
• Repower project support
• Worldwide shipping arrangements
• After-sales assistance

As an experienced marine gearbox dealer, trusted marine transmission supplier, and source for Yanmar gearbox USA products, we help customers identify the correct propulsion components for their vessel requirements.

Availability and Ordering Information

If you are looking to buy Yanmar gearbox equipment or searching for a Yanmar KM4AG-5 for sale USA, our team can provide current stock availability, lead times, and worldwide delivery options.

The Yanmar KM4AG-5 price may vary depending on inventory levels, destination, and shipping requirements. Likewise, overall Yanmar gearbox price levels can vary based on gearbox configuration, market conditions, and supply availability.

For customers comparing propulsion options, we can also provide information regarding other Yanmar gearbox for sale models, compatible transmission ratios, and complete propulsion packages.

What’s Included

When purchasing the Yanmar KM4A Gear R 2.63 for 4JH5 – KM4AG-5, your package may include:

• Genuine Yanmar KM4AG-5 Marine Gearbox
• Factory documentation
• Manufacturer warranty coverage
• Technical assistance from Yanmar Marine Experts
• Compatibility verification support

Package contents may vary depending on factory specifications and supply configuration.

Warranty and Technical Support

The KM4AG-5 is supplied with applicable manufacturer warranty coverage.

Our technical team remains available to assist with:

• Engine compatibility verification
• Gearbox selection guidance
• Reduction ratio recommendations
• Installation planning
• Product selection support
• Worldwide logistics arrangements

Whether you are sourcing a replacement Yanmar gearbox, installing a marine repower gearbox, or upgrading a complete propulsion package, our specialists can help ensure you receive the correct solution.

Frequently Asked Questions

Is the KM4AG-5 a genuine Yanmar gearbox?

Yes. We supply only genuine Yanmar marine transmissions backed by manufacturer warranty support.

Which engines are compatible with the KM4AG-5?

The KM4AG-5 is designed primarily for selected Yanmar 4JH5 Series marine diesel engines, including the 4JH45, 4JH57, 4JH80, and 4JH110.

What does the 2.63:1 reduction ratio provide?

The 2.63:1 ratio delivers increased propeller torque, enhanced low-speed maneuverability, improved docking control, and efficient cruising performance.

Is the KM4AG-5 suitable for repower projects?

Yes. The KM4AG-5 is frequently selected for marine repower gearbox installations, transmission replacements, and propulsion upgrades.

How do I get the latest Yanmar KM4AG-5 price?

Contact our sales team for current pricing, stock availability, lead times, and shipping options.

Request a Quote

Interested in the Yanmar KM4A Gear R 2.63 for 4JH5 – KM4AG-5 for sale?

Contact Yanmar Marine Experts today for the latest Yanmar KM4AG-5 price, current stock availability, and worldwide shipping options.

For the fastest assistance, please provide:

• Engine model
• Engine serial number
• Current gearbox model
• Vessel make and model
• Delivery destination

Our technical specialists will review your requirements and provide a tailored quotation along with compatibility guidance, availability information, and shipping options.