Yanmar KMH50A-3 RR 2.13 for 4LV Series (E-Shift) KMH50A-3 213 E 4LV
Description
Formed with fly by wire shifting, Yanmar KMH50A-3 Electronic Marine Transmission packages drop diesel engine revolutions through a 2.13:1 reduction ratio. The driveline unit channels 220 continuous horsepower at 3800 input RPM with hydraulic clutch clamping force. An 8-degree down angle suppresses shaft inclination, optimizing propeller thrust angles on modern fast cruising motor yachts.
Cast aluminum forms a stiff transmission housing designed to resist gear deflection under heavy continuous vessel push. Case-hardened 8620 alloy steel helical gears produce silent power conversion with minimal frictional resistance. Multi-disc sintered bronze clutch packs run immersed in pressurized oil for rapid heat removal. External hookups include 12-volt electronic control plugs, oil cooler lines, 2.1 quarts oil volume, and 75 lbs dry weight.
Key Features of KMH50A-3 213 E 4LV
Shipyards choose to buy Yanmar KMH50A-3 electronic marine transmission hardware to power modern performance motor cruisers. This drive train couples straight to Yanmar 4LV electronic diesel engines working under strenuous continuous cruising loads.
- An 8-degree down angle allows level engine installation inside low profile salon bilge spaces.
- A 2.13 to 1 reduction ratio permits the installation of efficient four-blade propeller wheels on planing hulls.
- Electronic proportional shift valves deliver instant clutch response without mechanical linkage friction.
- Precision ground helical gear teeth transfer up to 305 lb-ft continuous input torque without surface wear.
- An internal positive displacement oil pump maintains hydraulic line pressure between 260 and 310 PSI.
- External fluid lines route lubricant through a compact oil heat exchanger mounted adjacent to the casing.
- Flexible elastomeric coupling elements absorb cyclic engine crankshaft shock before entering the drive pinion shaft.
Electronic Clutch Hydraulic Thresholds
Internal lubrication pumps produce 285 PSI line pressure during high engine load conditions, preventing clutch pack slip while turning medium wheel diameters. Sump operating temperatures stabilize between 140°F and 175°F through a high-flow oil heat exchanger rejecting 250 BTU per minute. Rated for 305 lb-ft input torque at 3800 continuous engine RPM, this 2.13:1 reduction mechanism optimizes propeller rotation for heavy cruising crafts. Angled gear reduction lowers shaft revolutions to yield steady forward thrust against rough coastal sea swells.
Output Companion Bolt Pattern
A forged steel companion flange provides a 4.25-inch bolt circle matching six Grade 8 fasteners angled 8 degrees downward. Built-in heavy taper roller bearings take up 14 kilonewtons of shaft propeller thrust. Dialed runout alignment across the companion flange must remain below 0.0025 inches during shaft integration.
Digital Solenoid Maintenance Protocol
Gear selection takes place via electronic solenoid valve commands triggered by helm control heads. This reduction gearbox is not built for racing runabouts or lightweight stepped hulls powered by high-speed gasoline engines. Maintenance procedures demand structured upkeep intervals.
- Verify oil level with the dipstick gauge each shift before firing the main diesel engine.
- Inspect electrical wiring harnesses and multi-pin connectors for tight lockup every 250 run hours.
- Pump out old transmission oil down to the bottom and install fresh ATF fluid every 12 months.
Certified Driveline Warranty Inclusions
The manufacturer includes a 2-Year limited warranty protecting marine buyers against casting or gear machining flaws. Crated shipments contain the complete marine gearbox, flexible input coupling plate, oil cooler module with lines, output companion flange, oil dipstick gauge, and factory shop service documentation.
Yanmar KMH50A-3 RR 2.13 E-Shift Marine Gearbox Product Overview
The Yanmar KMH50A-3 RR 2.13 for 4LV Series (E-Shift) is a specialized angle reduction gear unit developed for compatible Yanmar 4LV marine diesel engine installations equipped with electronic shift transmission systems.
A marine angle gear is an important drivetrain component that transfers engine torque through the transmission system to the propeller shaft while maintaining the required reduction ratio and rotation direction for the vessels propulsion configuration.
This Yanmar KMH50A-3 angle reduction gear features a 2.13:1 reduction ratio and right-hand output rotation, making it suitable for specific Yanmar 4LV propulsion systems requiring electronic shift compatibility.
For customers searching for a Yanmar KMH50A-3 marine gearbox, Yanmar 4LV transmission replacement, or an OEM Yanmar marine propulsion component, this unit provides a purpose-built solution for compatible marine applications.
Designed for Yanmar 4LV E-Shift Propulsion Systems
The Yanmar KMH50A-3 RR 2.13 E-Shift marine gearbox is engineered to integrate with compatible Yanmar 4LV series diesel engines using electronic shift transmission configurations.
The E-Shift designation indicates compatibility with electronic shift control systems used in selected Yanmar 4LV marine installations.
This angle reduction gear supports the connection between the engine output and propeller shaft system, helping maintain correct drivetrain integration for vessels using shaft-driven propulsion.
Typical applications include:
- Sailing yachts
- Powerboats
- Marine repower projects
- Propulsion system replacement applications
- Compatible Yanmar 4LV installations
Compatibility should always be verified based on engine model, transmission configuration, rotation direction, and vessel requirements.
2.13:1 Reduction Ratio and Right-Hand Rotation
The Yanmar KMH50A-3 RR 2.13 features a 2.13:1 reduction ratio, allowing engine output speed to be adjusted to match the requirements of the propeller system.
The right-hand (RR) output rotation is a critical specification when selecting a marine gearbox or angle gear, as it must correspond with the vessels propeller and drivetrain arrangement.
Correct gearbox matching helps support:
- Proper propeller integration
- Correct rotation alignment
- Efficient drivetrain operation
- Reliable marine propulsion installation
Before installation, buyers should confirm all technical specifications with their existing propulsion system.
OEM Yanmar Marine Propulsion Component
The Yanmar KMH50A-3 RR 2.13 for 4LV Series (E-Shift) is designed as an OEM Yanmar marine propulsion component for compatible applications.
Using a correctly matched marine gearbox component helps maintain proper integration between:
- Engine
- Electronic shift transmission system
- Angle gear
- Propeller shaft arrangement
This unit is suitable for:
- Scheduled marine maintenance
- Gearbox replacement projects
- Engine repower work
- New compatible vessel installations
Professional installation is recommended to ensure correct alignment and drivetrain compatibility.
Reliable Solution for Marine Replacement Projects
Replacing a marine gearbox or angle reduction gear requires careful attention to technical specifications, including reduction ratio, rotation direction, engine compatibility, and mounting configuration.
The Yanmar KMH50A-3 RR 2.13 angle gear provides a practical replacement option for vessels requiring a compatible component for their Yanmar 4LV electronic shift propulsion system.
Before purchase, customers should verify:
- Engine model
- Shift configuration
- Reduction ratio
- Output rotation
- Mounting requirements
- Propeller system compatibility
Installation and Compatibility Considerations
The Yanmar KMH50A-3 RR 2.13 for 4LV Series (E-Shift) should be matched carefully with the vessels propulsion system.
Important considerations include:
- Yanmar 4LV engine compatibility
- Electronic E-Shift configuration
- 2.13:1 reduction requirement
- Right-hand output rotation
- Propeller shaft arrangement
- Vessel installation requirements
Correct matching ensures the gearbox integrates properly with the existing marine drivetrain.
Worldwide Marine Equipment Supply
The Yanmar KMH50A-3 RR 2.13 E-Shift Marine Gearbox Component is suitable for customers requiring professional marine transmission and propulsion component supply.
With experience shipping marine engines, transmissions, and spare parts worldwide, this component supports vessel owners, shipyards, marine technicians, and repower specialists requiring dependable Yanmar drivetrain solutions.
Technical Specifications
| Specification | Details |
|---|---|
| Product Name | Yanmar KMH50A-3 RR 2.13 for 4LV Series (E-Shift) |
| Manufacturer | Yanmar |
| Product Type | Angle reduction gear / marine gearbox component |
| Condition | OEM marine component |
| Engine Compatibility | Yanmar 4LV Series |
| Shift Configuration | Electronic E-Shift |
| Reduction Ratio | 2.13:1 |
| Output Rotation | Right-Hand (RR) |
| Application | Marine inboard propulsion systems |
| Suitable Vessels | Sailboats, powerboats, compatible marine vessels |
Key Product Details
The Yanmar KMH50A-3 RR 2.13 for 4LV Series (E-Shift) is an OEM Yanmar angle reduction gear unit designed for compatible 4LV marine propulsion systems.
Key features include:
- 2.13:1 reduction ratio
- Right-hand output rotation
- Electronic E-Shift compatibility
- Yanmar 4LV series integration
- Marine gearbox replacement suitability
This component is designed for vessels requiring a correctly matched Yanmar propulsion solution.
Frequently Asked Questions
What is the Yanmar KMH50A-3 RR 2.13 used for
The Yanmar KMH50A-3 RR 2.13 is an angle reduction gear unit used with compatible Yanmar 4LV series marine engines to transfer engine power to the propeller system.
What does E-Shift mean on this Yanmar gearbox
E-Shift refers to compatibility with electronic shift control systems used in selected Yanmar 4LV marine engine installations.
What is the reduction ratio
This unit features a 2.13:1 reduction ratio.
What does RR mean on this Yanmar gearbox
RR refers to the right-hand output rotation configuration.
Can this component be used for repower projects
Yes, when correctly matched with the vessels engine, transmission configuration, and propulsion system.
Should compatibility be confirmed before purchase
Yes. Buyers should verify engine model, shift type, rotation, reduction ratio, and installation requirements before purchase.
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