Yanmar KM35P Parallel Gear R 2.61 for JH5 KM35PG
Description
Formed for parallel driveline harbor cutters, Yanmar KM35P Parallel Marine Transmission modules reduce engine driveshaft revs across a 2.61:1 reduction ratio. The transmission manages 45 continuous horsepower at 3000 input RPM with mechanical cone clutch packs. Straight inline shaft geometry aligns engine packages along deep bilge keels on traditional wooden launches.
High-strength aluminum alloy provides a rigid transmission framework that resists shaft deflection under propeller thrust. Carburized helical gear sets ground to AGMA 10 standards isolate gear noise and prevent tooth scuffing under severe cruising loads. Precision bronze cone clutches provide immediate forward and reverse gear engagement. Equipment interfaces include parallel companion flanges, cable brackets, 0.5 quarts oil capacity, and 27 lbs dry weight.
Key Features of Yanmar KM35PG
Launch operators prefer to buy Yanmar KM35P parallel marine transmission packages when replacing worn straight shaft transmissions. The drivetrain supports continuous duty marine diesels working day after day in river service applications.
- A parallel output shaft orientation simplifies shaft alignment along traditional straight keel lines.
- A 2.61 to 1 reduction ratio yields high torque output to swing heavy pitch propellers on displacement hulls.
- Mechanical cone clutches lock drive shafts firm without slippage during sudden throttle changes.
- High-tensile helical gear teeth handle 80 lb-ft continuous input torque with minimal gear wear.
- Natural convection cooling eliminates the need for complex external seawater heat exchangers and plumbing.
- Torsional rubber drive elements isolate diesel crankshaft vibration before it hits internal input shafts.
- Precision bell adapter rings mate straight to Yanmar 3JH and 4JH marine diesel engine casings.
Inline Reduction Cruise Thresholds
Mechanical cone clutch clamping surfaces generate positive lockup under full diesel throttle, preventing slippage under hard motoring loads. Continuous input torque reaches 80 lb-ft at 3000 engine RPM under commercial pleasure craft standards. Lubricant sump temperatures stay within 130°F to 165°F through convection cooling across finned aluminum casing surfaces. The parallel configuration and 2.61:1 reduction ratio permit efficient propeller placement on deep displacement launch hulls.
Output Coupling Dial Tolerances
The output companion flange exhibits an outside diameter of 4.00 inches with four bolt holes located on a 3.25-inch circle. An integrated heavy thrust bearing absorbs 5 kilonewtons of continuous forward prop thrust. Alignment technicians keep shaft runout within 0.002 inches across the parallel output centerline.
Transmission Cable Service Schedule
Mechanical control levers actuate internal selector forks to switch between forward, neutral, and reverse positions without delay. This light marine transmission is not intended for high-speed sport fishing boats or commercial towing tugs running severe duty cycles. Preventive care follows precise running periods.
- Inspect transmission fluid levels on the dipstick each shift prior to operating the main diesel engine.
- Check remote control cable stroke to verify complete cone clutch engagement travel every 250 operational hours.
- Drain used lubricant from the sump down to empty and replace with fresh engine oil every 12 months.
Equipment Warranty Crate Inclusions
The builder provides a 2-Year limited warranty covering materials and machining against unexpected mechanical breakdown. Crated packages include the complete marine gearbox, flexible torsional input coupling, companion flange, transmission dipstick gauge, and comprehensive technical installation instructions.
Yanmar KM35P Parallel Gear R 2.61 Marine Gearbox Product Overview
The Yanmar KM35P Parallel Gear R 2.61 for JH5 is a specialized marine transmission component designed for Yanmar diesel propulsion systems where a parallel gearbox configuration is required.
A marine gearbox serves as the mechanical interface between the engine and the propeller shaft. In a parallel gear layout, the transmission supports a straight-through drivetrain arrangement where alignment, ratio matching, and controlled power transfer are essential for proper marine propulsion integration.
Configured with a 2.61 reduction ratio, this Yanmar KM35P marine gearbox is intended for compatible Yanmar JH5-series diesel engine applications specified for KM35P parallel gear installations.
For customers searching for a Yanmar KM35P marine gearbox, Yanmar JH5 gearbox replacement, Yanmar KM35PG transmission, or an OEM Yanmar marine propulsion component, this unit provides a fitment-focused solution for compatible inboard diesel systems.
Designed for Yanmar JH5-Series Engines
The Yanmar KM35P Parallel Gear R 2.61 is compatible with Yanmar JH5-series diesel engines specified for KM35P parallel gear applications.
Yanmar JH5 installations require drivetrain components that match the engine, shafting system, propeller arrangement, controls, and vessel layout accurately. This gearbox is intended for standard marine propulsion layouts where the engine, transmission, mounts, controls, shafting system, and propeller must integrate according to manufacturer specifications.
Typical applications include:
- Sailboats
- Auxiliary powerboats
- Yanmar JH5 repower projects
- OEM marine gearbox replacement
- Compatible inboard diesel installations
- New marine propulsion setups requiring KM35P gear fitment
Before purchase or installation, buyers should confirm the exact engine model, gearbox specification, reduction ratio, gear configuration, mounting arrangement, control setup, and shafting layout.
2.61 Reduction Ratio Configuration
The Yanmar KM35P Parallel Gear R is configured with a 2.61 reduction ratio, which helps adapt engine output speed to the propeller shaft requirements of the vessel.
A correctly matched reduction gearbox supports:
- Controlled propeller shaft speed
- Suitable torque transmission
- Proper propeller drive integration
- Consistent inboard diesel propulsion operation
- Standard shaft alignment
- Compatibility with approved Yanmar propulsion layouts
This gearbox should be selected only when the vessel and engine configuration require the KM35P Parallel Gear R 2.61 specification.
Parallel Gear Configuration for Straight-Through Drivetrains
The parallel gear configuration is intended for marine drivetrain layouts where the engine and propeller shaft operate in a straight-through arrangement.
This design supports standard shaft alignment in compatible installations and helps maintain the required mechanical connection between the engine output and propeller shaft.
For vessels using Yanmar JH5-series engines, the correct parallel gearbox configuration helps preserve:
- Proper shaft alignment
- Correct drivetrain geometry
- Compatible mounting fitment
- Controlled power transfer
- Reliable engine-to-propeller integration
The gearbox should always be matched to the vessels approved Yanmar configuration before installation.
OEM Yanmar Marine Propulsion Component
The Yanmar KM35P Parallel Gear R 2.61 for JH5 forms part of an OEM Yanmar marine propulsion assembly.
Using the correct OEM-style gearbox helps maintain proper integration between the Yanmar JH5 diesel engine, transmission system, controls, engine mounts, shafting system, and propeller.
This component is suitable for:
- Replacement of existing compatible transmissions
- Yanmar JH5 repower projects
- Inboard diesel drivetrain service
- New marine installations requiring KM35P parallel gear compatibility
- Marine propulsion system refurbishment
Professional installation is recommended to ensure correct alignment, fitment, control connection, lubrication, and shaft integration.
Suitable for Sailboats and Auxiliary Powerboats
The Yanmar KM35P Parallel Gear R 2.61 marine gearbox is suitable for compatible sailboats and auxiliary powerboats using Yanmar JH5 inboard diesel propulsion systems.
Sailboats and auxiliary powerboats often rely on dependable inboard diesel propulsion layouts where the gearbox must match the engine, shafting system, propeller setup, and mounting arrangement accurately. This gearbox supports applications where a Yanmar JH5-series engine requires a compatible KM35P parallel marine transmission with a 2.61 reduction ratio.
For buyers searching for a marine gearbox for sailboats, Yanmar parallel gearbox, or Yanmar marine gearbox replacement, this unit provides a direct fitment-focused solution for compatible Yanmar applications.
Replacement and Repower Applications
The Yanmar KM35P Parallel Gear R 2.61 for JH5 is commonly used for replacing existing transmissions, supporting compatible repower projects, or completing new installations requiring an OEM Yanmar transmission solution.
When replacing a marine gearbox, technical accuracy is essential. Ratio, engine model, gear configuration, mounting geometry, controls, and shaft arrangement must all be confirmed before installation.
Buyers should verify:
- Yanmar JH5-series engine compatibility
- KM35P parallel gear requirement
- 2.61 reduction ratio
- Gear R configuration
- Mounting and alignment requirements
- Control and shafting compatibility
- Vessel installation details
Correct specification matching helps support consistent power transfer and proper propeller shaft integration.
Installation and Compatibility Considerations
The Yanmar KM35P Parallel Gear R 2.61 marine transmission should be installed according to manufacturer specifications and matched carefully with the vessels existing propulsion system.
Important considerations include engine model, reduction ratio, gear configuration, mounting geometry, engine mounts, shaft alignment, propeller selection, control connection, lubrication requirements, and service access.
Marine drivetrain components should be installed by qualified technicians familiar with Yanmar propulsion systems. Proper installation helps support dependable operation and avoids compatibility issues caused by incorrect ratio, alignment, or control setup.
Worldwide Marine Equipment Supply
The Yanmar KM35P Parallel Gear R 2.61 for JH5 is suitable for customers requiring professional marine transmission and propulsion component supply.
With experience shipping marine engines, transmissions, and spare parts worldwide, this component can support vessel owners, shipyards, marine technicians, and repower specialists requiring dependable Yanmar drivetrain solutions.
Technical Specifications
| Specification | Details |
|---|---|
| Product Name | Yanmar KM35P Parallel Gear R 2.61 for JH5 |
| Part Reference | KM35PG |
| Manufacturer | Yanmar |
| Product Type | Marine parallel gearbox / inboard reduction transmission |
| Gear Series | KM35P |
| Gear Configuration | Parallel Gear R |
| Engine Compatibility | Yanmar JH5-Series Diesel Engines |
| Reduction Ratio | 2.61 |
| Application | Inboard marine diesel propulsion |
| Drivetrain Layout | Straight-through / parallel gear configuration |
| Suitable Vessels | Sailboats, auxiliary powerboats, compatible marine vessels |
| Typical Use | Gearbox replacement, repower work, new compatible installations |
| Main Function | Engine output transfer to propeller shaft |
| Component Type | OEM Yanmar marine propulsion transmission component |
Key Product Details
The Yanmar KM35P Parallel Gear R 2.61 for JH5 is an OEM Yanmar marine gearbox replacement designed for compatible JH5-series diesel propulsion systems.
Key details include:
- KM35PG part reference
- KM35P gear series
- Parallel Gear R configuration
- 2.61 reduction ratio
- Compatibility with Yanmar JH5-series diesel engines
- Straight-through inboard diesel drivetrain use
- Suitable for sailboats and auxiliary powerboats
- Applicable for replacement, repower, and new installations
- Designed as an OEM Yanmar marine propulsion component
This gearbox should be selected only when the vessel requires this exact Yanmar KM35P parallel gear configuration.
Frequently Asked Questions
What is the Yanmar KM35P Parallel Gear R 2.61 used for
The Yanmar KM35P Parallel Gear R 2.61 is a marine transmission component used to transmit engine output from compatible Yanmar JH5-series diesel engines to the propeller shaft in straight-through inboard propulsion systems.
Which engines is this gearbox compatible with
This gearbox is compatible with Yanmar JH5-series diesel engines specified for KM35P parallel gear applications.
What is the reduction ratio
This unit has a 2.61 reduction ratio.
What does parallel gear mean
A parallel gear configuration is used in straight-through drivetrain layouts where the gearbox supports alignment between the engine output and propeller shaft arrangement.
Is this an OEM Yanmar marine gearbox component
Yes. It is described as an OEM Yanmar marine propulsion transmission component for compatible applications.
Can this gearbox be used for sailboats
Yes, it can be suitable for compatible sailboats using Yanmar JH5 inboard diesel propulsion systems requiring this gearbox specification.
Can this gearbox be used for auxiliary powerboats
Yes, it can be suitable for compatible auxiliary powerboats with approved Yanmar JH5 marine diesel installations.
Can this gearbox be used for repower projects
Yes, it can be used in compatible repower projects involving Yanmar JH5-series engines where the KM35P Parallel Gear R 2.61 configuration is required.
Should compatibility be verified before purchase
Yes. Buyers should verify the engine model, gear series, reduction ratio, mounting requirements, controls, shafting layout, and vessel installation details before purchase.
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