Yanmar KM4A Gear R 1.47 for 4JH5 – KM4ASS-5

Description

Yanmar KM4A Gear R 1.47 for 4JH5 – KM4ASS-5 For Sale

The Yanmar KM4A Gear R 1.47 for 4JH5 – KM4ASS-5 is a genuine Yanmar marine transmission specifically engineered for selected Yanmar 4JH5 Series marine diesel engines. Featuring a 1.47:1 reduction ratio and a proven marine gearbox design, the KM4ASS-5 delivers efficient power transfer, responsive vessel performance, and exceptional long-term reliability for planing boats, semi-displacement vessels, sport cruisers, and commercial marine applications.

Designed to integrate seamlessly with Yanmar’s advanced 4JH5 engine platform, the KM4ASS-5 marine gearbox provides an ideal solution for applications where higher propeller shaft speeds are required. The lower reduction ratio allows for increased shaft RPM while maintaining smooth power delivery, making it particularly suitable for vessels designed to achieve higher cruising and top-end speeds.

Whether you are replacing an existing transmission, upgrading a propulsion system, or undertaking a complete marine repower project, the KM4ASS-5 delivers the durability, efficiency, and performance expected from a genuine Yanmar marine transmission.

If you are searching for a Yanmar KM4ASS-5 for sale, a dependable Yanmar marine gearbox, or 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 KM4ASS-5 is designed for selected Yanmar 4JH5 Series marine diesel engines.

Common applications include:

Compatibility should always be verified before ordering. Our technical team can review your engine model and serial number to confirm suitability.

Understanding the 1.47:1 Reduction Ratio

The 1.47:1 reduction ratio is designed for applications where higher propeller shaft speeds are desired. Compared to higher reduction ratios, the 1.47:1 configuration allows the propeller to rotate faster relative to engine speed, making it particularly suitable for lighter vessels and planing hull designs.

Benefits of the 1.47:1 reduction ratio include:

• Higher shaft RPM
• Improved top-end vessel speed
• Efficient power delivery
• Responsive acceleration
• Optimized performance for lighter vessels
• Reduced drivetrain losses

Selecting the correct reduction ratio is critical to maximizing the performance of your complete Yanmar propulsion system.

Engineered for 4JH5 Marine Engines

The Yanmar 4JH5 Series is recognized worldwide for its reliability, fuel efficiency, and smooth operation. The KM4ASS-5 is specifically engineered to complement these engines and provide seamless integration within the propulsion system.

As part of a complete Yanmar propulsion system, the KM4ASS-5 contributes to:

• Efficient power transmission
• Smooth gear engagement
• Responsive vessel handling
• Reliable cruising performance
• Long-term operational durability

For customers researching a Yanmar 4JH45 for sale, comparing Yanmar 4JH57 price options, or planning a propulsion upgrade, selecting the correct transmission ratio is essential to achieving optimum vessel performance.

Reliable Marine Gearbox Design

The KM4A Series has earned a reputation among boat owners, marine engineers, and boatyards for dependable performance in demanding marine environments.

Advantages include:

• Smooth forward and reverse engagement
• Reliable power transfer
• Compact installation design
• Long service life
• Simplified maintenance requirements

These qualities make the KM4A Series a trusted replacement Yanmar gearbox solution for recreational and commercial marine operators.

Why Choose a Genuine Yanmar Gearbox?

Choosing a genuine Yanmar gearbox helps ensure compatibility between the engine, controls, shaft system, and propeller assembly.

Benefits include:

• Factory-engineered compatibility
• Proven marine durability
• Manufacturer warranty support
• Long-term parts availability
• Reliable propulsion performance
• Simplified servicing and maintenance

For vessel owners investing in a commercial marine gearbox, marine repower gearbox, or transmission replacement project, genuine Yanmar components help maintain the integrity of the complete propulsion package.

Common Applications

The Yanmar KM4ASS-5 is commonly used in:

• Sport cruisers
• Planing hull vessels
• Coastal cruising boats
• Commercial vessels
• Marine repower projects
• Transmission replacement projects

For operators searching for a dependable boat transmission for sale, the KM4ASS-5 remains one of Yanmar’s trusted marine transmission solutions.

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
• Repower planning
• Technical guidance
• Worldwide shipping arrangements
• After-sales support

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

Availability and Ordering Information

If you are looking to buy Yanmar gearbox equipment or searching for a Yanmar KM4ASS-5 for sale USA, our team can provide current stock availability, lead times, and delivery options.

The Yanmar KM4ASS-5 price may vary depending on inventory availability, destination, and shipping requirements. Likewise, overall Yanmar gearbox price levels may vary based on market conditions and supply chain availability.

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

What’s Included

When purchasing the Yanmar KM4A Gear R 1.47 for 4JH5 – KM4ASS-5, your package may include:

• Genuine Yanmar KM4ASS-5 Marine Gearbox
• Factory documentation
• Manufacturer warranty coverage
• Technical assistance from Yanmar Marine Experts
• Compatibility verification support

Package contents may vary depending on supply specifications.

Warranty and Technical Support

The KM4ASS-5 is supplied with applicable manufacturer warranty coverage.

Our team remains available to assist with:

• Engine compatibility verification
• Gearbox selection guidance
• Reduction ratio recommendations
• 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 KM4ASS-5 a genuine Yanmar gearbox?

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

Which engines are compatible with the KM4ASS-5?

The KM4ASS-5 is designed primarily for selected Yanmar 4JH5 Series marine diesel engines, including the 4JH45, 4JH57, and 4JH80.

What does the 1.47:1 reduction ratio provide?

The 1.47:1 ratio allows higher propeller shaft speeds, making it ideal for applications requiring responsive acceleration and higher cruising speeds.

Is the KM4ASS-5 suitable for repower projects?

Yes. The KM4ASS-5 is frequently used in vessel repowers, marine transmission replacements, and propulsion upgrades involving Yanmar 4JH5 engines.

How do I get the latest Yanmar KM4ASS-5 price?

Contact our sales team for current pricing, stock availability, and delivery options.

Request a Quote

Interested in the Yanmar KM4A Gear R 1.47 for 4JH5 – KM4ASS-5 for sale?

Contact Yanmar Marine Experts today for the latest Yanmar KM4ASS-5 price, 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.