Description
Advance HC138 Heavy Duty Marine Gearbox – Product Overview
The NEW Advance HC138 Heavy Duty Marine Gearbox 3.57:1 Reduction is a compact yet heavy-duty marine hydraulic gearbox designed for commercial propulsion systems requiring reliable power transfer, correct gear reduction, and professional installation matching.
Built for commercial vessel applications, the Advance HC138 is used between the marine engine and propeller shaft system to reduce engine speed and transfer power through the drivetrain. This model is configured with a 3.57:1 reduction ratio, making it suitable for propulsion setups where the vessel requires controlled reduction for correct propeller operation.
For buyers searching for an Advance HC138 marine gearbox, Advance HC138 3.57:1 gearbox, heavy duty marine hydraulic gearbox, or commercial marine gearbox replacement, this unit provides a practical fitment-focused solution for marine technicians, fleet operators, shipyards, and vessel owners.
Built for Commercial Marine Applications
The Advance HC138 Heavy Duty Marine Gearbox is designed for commercial marine propulsion applications where drivetrain reliability, correct matching, and proper installation are important.
Commercial marine applications may include:
- Workboats
- Fishing vessels
- Passenger vessels
- Utility vessels
- Small commercial craft
- Fleet maintenance projects
- Commercial repower projects
- New marine propulsion installations
Its hydraulic gearbox design supports controlled engagement and dependable drivetrain operation when matched with the correct engine, adaptor plate, drive plate, control system, shafting, propeller, cooling arrangement, and vessel duty cycle.
3.57:1 Reduction Ratio Configuration
This product is specified with a 3.57:1 reduction ratio, one of the available HC138 ratio options.
A marine gearbox reduction ratio determines how engine speed is reduced before power reaches the propeller shaft. Selecting the correct ratio is important because the gearbox must be matched to the engine output, propeller size, vessel displacement, hull design, operating speed, load profile, and commercial duty cycle.
The 3.57:1 ratio is suitable for applications where the propulsion system requires controlled reduction for proper propeller performance and drivetrain integration.
Available Advance HC138 ratio options include:
| Ratio Option | Rating |
|---|---|
| 2.00:1 | 0.15 hp/RPM |
| 2.52:1 | 0.15 hp/RPM |
| 3.00:1 | 0.15 hp/RPM |
| 3.57:1 | 0.15 hp/RPM |
| 4.05:1 | 0.15 hp/RPM |
| 4.45:1 | 0.15 hp/RPM |
This page is specifically for the 3.57:1 reduction configuration with a 0.15 hp/RPM rating.
Heavy Duty Hydraulic Marine Transmission
The Advance HC138 is a heavy duty marine hydraulic gearbox designed to support controlled clutch engagement and reliable transmission of engine power through the marine drivetrain.
Hydraulic marine gearboxes are widely used in commercial vessel applications because they can provide smooth engagement and practical drivetrain integration when properly selected and installed. The HC138 is suited for commercial propulsion systems where gearbox ratio, input speed, adaptor plate type, control method, cooling requirements, and shaft alignment must all be confirmed before installation.
Key drivetrain considerations include:
- Engine output compatibility
- Gear ratio selection
- Maximum input speed
- Adaptor plate type
- Drive plate size
- Control type
- Shafting and propeller requirements
- Cooling and lubrication setup
- Mounting arrangement
- Vessel duty cycle and operating profile
The gearbox should always be matched to the engine, vessel, propeller, and duty cycle by a qualified marine technician or propulsion specialist.
Maximum Input Speed of 2500 RPM
The Advance HC138 marine gearbox is rated with a maximum input speed of 2500 RPM.
This specification is important when matching the gearbox to a marine engine. The selected engine must operate within the gearbox’s approved input speed range, and the final drivetrain configuration should be checked against the vessel’s propulsion requirements.
Correct matching of input speed, reduction ratio, engine power, propeller load, and duty cycle helps support dependable gearbox operation in commercial marine use.
SAE1 Adaptor Plate Option
The NEW Advance HC138 Heavy Duty Marine Gearbox 3.57:1 Reduction is available with an SAE1 adaptor plate option.
The adaptor plate is an important fitment component between the engine and gearbox. It must match the engine flywheel housing and installation requirements to support proper alignment and secure mechanical connection.
Buyers should confirm the SAE1 adaptor plate requirement before purchase to ensure compatibility with the engine and vessel installation.
Mechanical and Electronic Control Options
The Advance HC138 3.57:1 marine gearbox can be configured with different control options depending on the vessel’s control system.
Available control options include:
- Mechanical control
- Electronic control
Mechanical control setups are often used in traditional marine installations with cable or linkage-based control systems. Electronic control options may be suitable for vessels using electronic throttle and shift systems.
The required control type should be confirmed before purchase to ensure compatibility with the vessel’s helm controls, control cables, electronic interface, and overall propulsion arrangement.
Drive Plate Options
The HC138 is available with multiple drive plate options to support different engine and gearbox connection requirements.
Available drive plate sizes include:
- 11.5” drive plate
- 14” drive plate
Drive plate selection should be confirmed based on engine specification, flywheel configuration, torsional requirements, torque rating, and gearbox compatibility. Correct drive plate matching helps support smooth power transfer between the engine and gearbox.
Gearbox Oil Cooler Option
The Advance HC138 Heavy Duty Marine Gearbox offers an option for a gearbox oil cooler.
A gearbox oil cooler may be required depending on operating conditions, engine output, transmission load, vessel duty cycle, and the cooling arrangement of the installation. Commercial marine applications often require careful temperature management to support stable gearbox operation.
Cooling requirements should be confirmed before installation based on the propulsion system and manufacturer recommendations.
Commercial Repower and Replacement Applications
The NEW Advance HC138 Heavy Duty Marine Gearbox 3.57:1 Reduction is suitable for commercial repower projects, gearbox replacement, and new marine propulsion installations requiring a compact heavy-duty hydraulic transmission.
During a repower or replacement project, the gearbox must be matched carefully to the vessel’s engine, propeller, shafting, mounting arrangement, cooling system, control type, and duty cycle.
Buyers should confirm:
- Advance HC138 gearbox requirement
- 3.57:1 reduction ratio
- 0.15 hp/RPM rating requirement
- SAE1 adaptor plate
- Mechanical or electronic control
- 11.5” or 14” drive plate
- Oil cooler requirement
- Engine output and input speed
- Shafting and propeller compatibility
- Vessel duty cycle and commercial application
Correct configuration helps support dependable marine propulsion system integration.
Installation and Compatibility Considerations
The Advance HC138 marine gearbox should be installed according to manufacturer specifications and matched carefully with the vessel’s propulsion system.
Important installation considerations include engine model, adaptor plate type, drive plate size, gearbox ratio, control configuration, mounting arrangement, shaft alignment, oil cooler requirement, lubrication, foundation support, coupling setup, and service access.
This gearbox should be installed by qualified marine technicians familiar with commercial marine propulsion systems. Proper installation helps reduce the risk of alignment issues, control mismatch, overheating, drivetrain vibration, premature wear, or incorrect gearbox selection.
Worldwide Marine Equipment Supply
The NEW Advance HC138 Heavy Duty Marine Gearbox 3.57:1 Reduction is suitable for customers requiring professional commercial marine gearbox supply.
With experience shipping marine engines, transmissions, gearboxes, propulsion components, and spare parts worldwide, this gearbox can support vessel owners, shipyards, marine technicians, fleet operators, and repower specialists requiring dependable commercial marine drivetrain solutions.
Technical Specifications
| Specification | Details |
| Product Name | NEW Advance HC138 Heavy Duty Marine Gearbox 3.57:1 Reduction |
| Manufacturer | Advance |
| Model | HC138 |
| Product Type | Heavy Duty Marine Hydraulic Gearbox |
| Primary Application | Commercial Marine Propulsion |
| Selected Ratio | 3.57:1 |
| Selected Ratio Rating | 0.15 hp/RPM |
| Available Ratio Options | 2.00:1, 2.52:1, 3.00:1, 3.57:1, 4.05:1, 4.45:1 |
| Rating Options | 0.15 hp/RPM |
| Maximum Input Speed | 2500 RPM |
| Adaptor Plate Option | SAE1 |
| Control Options | Mechanical, Electronic |
| Drive Plate Options | 11.5”, 14” |
| Gearbox Oil Cooler | Optional |
| Weight | 360 kg |
| Drop Centre | 225 mm |
| Dimensions | 520 × 792 × 760 mm |
| Suitable Use | Commercial vessels, workboats, repower projects, new marine installations |
| Component Type | Heavy-duty commercial marine transmission |
Key Product Details
The NEW Advance HC138 Heavy Duty Marine Gearbox 3.57:1 Reduction is a configurable commercial marine hydraulic gearbox designed for dependable drivetrain applications.
Key details include:
- Advance HC138 heavy-duty marine gearbox
- 3.57:1 reduction ratio
- 0.15 hp/RPM rating for the 3.57:1 option
- 2500 RPM maximum input speed
- SAE1 adaptor plate option
- Mechanical or electronic control options
- 11.5” and 14” drive plate options
- Optional gearbox oil cooler
- 360 kg gearbox weight
- 225 mm drop centre
- 520 × 792 × 760 mm dimensions
- Designed for commercial marine applications
This gearbox should be selected only when the engine, vessel, control system, ratio, mounting arrangement, and drivetrain requirements match the HC138 specification.
Frequently Asked Questions
What is the Advance HC138 marine gearbox used for?
The Advance HC138 marine gearbox is used in commercial marine propulsion systems to transfer engine power through a heavy-duty hydraulic transmission to the propeller shaft system.
What reduction ratio is this gearbox configured with?
This product is specified with a 3.57:1 reduction ratio.
What is the rating for the 3.57:1 ratio?
The 3.57:1 ratio option is listed with a 0.15 hp/RPM rating.
What ratio options are available for the Advance HC138?
Available ratio options include 2.00:1, 2.52:1, 3.00:1, 3.57:1, 4.05:1, and 4.45:1.
What is the maximum input speed?
The maximum input speed is 2500 RPM.
What adaptor plate option is available?
The available adaptor plate option is SAE1.
What control options are available?
The gearbox can be configured with mechanical or electronic control options.
What drive plate sizes are available?
Drive plate options include 11.5” and 14”.
Is a gearbox oil cooler available?
Yes. A gearbox oil cooler is available as an option.
What is the weight of the gearbox?
The gearbox weighs 360 kg.
What is the drop centre?
The drop centre is 225 mm.
What are the dimensions?
The dimensions are 520 × 792 × 760 mm.
Should compatibility be verified before purchase?
Yes. Buyers should verify engine compatibility, ratio requirement, adaptor plate type, drive plate size, control option, oil cooler requirement, shaft alignment, mounting arrangement, and vessel duty cycle before purchase.
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