Description
Advance HCT800 Heavy Duty Marine Gearbox – Product Overview
The NEW Advance HCT800 Heavy Duty Marine Gearbox 6.43:1 Reduction is a robust marine hydraulic gearbox engineered for commercial marine propulsion systems where high drivetrain capacity, correct ratio selection, and professional installation configuration are required.
Built for demanding vessel applications, the Advance HCT800 supports installations where the gearbox must be accurately matched between the marine engine and propeller shaft system. This model is configured with a 6.43:1 reduction ratio, making it suitable for heavy-duty propulsion setups requiring controlled engine speed reduction before power reaches the propeller.
For customers searching for an Advance HCT800 marine gearbox, Advance HCT800 6.43:1 gearbox, heavy duty marine hydraulic gearbox, or commercial marine gearbox for repower projects, this unit provides a fitment-focused solution for workboats, commercial vessels, shipyards, fleet operators, and marine propulsion specialists.
Built for Commercial Marine Applications
The Advance HCT800 Heavy Duty Marine Gearbox is designed for commercial propulsion environments where the drivetrain must support demanding operating conditions, long service cycles, and properly matched torque transfer.
Commercial marine applications may include:
- Workboats
- Fishing vessels
- Landing craft
- Passenger vessels
- Utility boats
- Tug and service vessels
- Fleet repower projects
- New heavy-duty propulsion installations
Its hydraulic transmission design supports controlled engagement and dependable power transfer when matched with compatible engines, drive plates, adaptor plates, controls, cooling systems, mounting arrangements, shafting, and propeller requirements.
6.43:1 Reduction Ratio Configuration
This product is specified with a 6.43:1 reduction ratio, one of the available HCT800 ratio options.
A marine gearbox reduction ratio determines how engine speed is reduced before reaching the propeller shaft. In commercial marine propulsion, the correct ratio must be selected based on engine output, propeller size, vessel duty cycle, hull type, load profile, operating speed, and application requirements.
The 6.43:1 ratio is suitable for applications where the propulsion system requires controlled reduction for correct propeller operation and drivetrain matching.
Available Advance HCT800 ratio options include:
| Ratio Option | Rating |
|---|---|
| 4.95:1 | 0.85 hp/RPM |
| 5.57:1 | 0.85 hp/RPM |
| 5.68:1 | 0.85 hp/RPM |
| 5.93:1 | 0.85 hp/RPM |
| 6.43:1 | 0.85 hp/RPM |
| 6.86:1 | 0.80 hp/RPM |
| 7.33:1 | 0.75 hp/RPM |
| 7.84:1 | 0.70 hp/RPM |
| 8.40:1 | 0.65 hp/RPM |
This page is specifically for the 6.43:1 reduction configuration with a 0.85 hp/RPM rating.
Heavy Duty Hydraulic Marine Transmission
The Advance HCT800 is a heavy duty marine hydraulic gearbox designed to transfer engine power through the marine drivetrain while supporting controlled clutch engagement and dependable transmission operation.
Hydraulic marine gearboxes are commonly used in commercial vessel applications because they are built for smooth engagement and strong drivetrain integration when selected and installed correctly. The HCT800 is intended for heavier commercial propulsion requirements where gearbox weight, drop centre, ratio selection, input speed, and cooling requirements must be matched carefully.
Key drivetrain considerations include:
- Engine output compatibility
- Gear ratio selection
- Maximum input speed
- Adaptor plate size
- Drive plate size
- Control type
- Shafting and propeller requirements
- Cooling and lubrication setup
- 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 1800 RPM
The Advance HCT800 marine gearbox is rated with a maximum input speed of 1800 RPM.
This specification is important when matching the gearbox to the engine. The selected engine must operate within the gearbox’s approved input speed range, and the final drivetrain setup should be verified according to the vessel’s propulsion requirements.
For commercial applications, correct matching of input speed, reduction ratio, propeller load, and duty rating helps support dependable gearbox operation and proper propulsion system integration.
SAE Adaptor Plate Options
The NEW Advance HCT800 Heavy Duty Marine Gearbox 6.43:1 Reduction is available with SAE adaptor plate options to support different engine installation requirements.
Adaptor plate options include:
- SAE0
- SAE00
The correct adaptor plate should be selected based on the engine flywheel housing, mounting configuration, and marine installation requirements. Choosing the correct adaptor plate is essential for accurate engine-to-gearbox alignment and secure mechanical integration.
Mechanical and Electronic Control Options
The Advance HCT800 6.43:1 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 commonly 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 architecture.
Buyers should confirm the required control configuration before purchase to ensure compatibility with the vessel’s helm controls, control cables, electronic interface, and overall propulsion setup.
Drive Plate Options
The HCT800 is available with multiple drive plate options to support different engine and gearbox connection requirements.
Available drive plate sizes include:
- 18” drive plate
- 21” 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 torque transfer between the engine and gearbox.
Gearbox Oil Cooler Option
The Advance HCT800 Heavy Duty Marine Gearbox offers an option for a gearbox oil cooler.
A gearbox oil cooler may be required in commercial marine installations where operating conditions, duty cycle, engine output, and transmission load require additional temperature management. Cooling requirements should be confirmed based on the vessel’s propulsion system and manufacturer recommendations.
Correct gearbox cooling helps support stable operating conditions when the transmission is working under heavy commercial load.
Commercial Repower and Replacement Applications
The NEW Advance HCT800 Heavy Duty Marine Gearbox 6.43:1 Reduction is suitable for commercial repower projects, gearbox replacement, and new vessel installations requiring a 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 HCT800 gearbox requirement
- 6.43:1 reduction ratio
- 0.85 hp/RPM rating requirement
- SAE0 or SAE00 adaptor plate
- Mechanical or electronic control
- 18” or 21” 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 HCT800 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 requirements, 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 HCT800 Heavy Duty Marine Gearbox 6.43:1 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 heavy-duty drivetrain solutions.
Technical Specifications
| Specification | Details |
| Product Name | NEW Advance HCT800 Heavy Duty Marine Gearbox 6.43:1 Reduction |
| Manufacturer | Advance |
| Model | HCT800 |
| Product Type | Heavy Duty Marine Hydraulic Gearbox |
| Primary Application | Commercial Marine Propulsion |
| Selected Ratio | 6.43:1 |
| Selected Ratio Rating | 0.85 hp/RPM |
| Available Ratio Options | 4.95:1, 5.57:1, 5.68:1, 5.93:1, 6.43:1, 6.86:1, 7.33:1, 7.84:1, 8.40:1 |
| Rating Options | 0.85 hp/RPM, 0.80 hp/RPM, 0.75 hp/RPM, 0.70 hp/RPM, 0.65 hp/RPM depending on ratio |
| Maximum Input Speed | 1800 RPM |
| Adaptor Plate Options | SAE0, SAE00 |
| Control Options | Mechanical, Electronic |
| Drive Plate Options | 18”, 21” |
| Gearbox Oil Cooler | Optional |
| Weight | 2700 kg |
| Drop Centre | 450 mm |
| Dimensions | 1056 × 1280 × 1425 mm |
| Suitable Use | Commercial vessels, workboats, fleet repower projects, new marine installations |
| Component Type | Heavy-duty commercial marine transmission |
Key Product Details
The NEW Advance HCT800 Heavy Duty Marine Gearbox 6.43:1 Reduction is a configurable commercial marine hydraulic gearbox designed for heavy-duty drivetrain applications.
Key details include:
- Advance HCT800 heavy-duty marine gearbox
- 6.43:1 reduction ratio
- 0.85 hp/RPM rating for the 6.43:1 option
- 1800 RPM maximum input speed
- SAE0 and SAE00 adaptor plate options
- Mechanical or electronic control options
- 18” and 21” drive plate options
- Optional gearbox oil cooler
- 2700 kg gearbox weight
- 450 mm drop centre
- 1056 × 1280 × 1425 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 HCT800 specification.
Frequently Asked Questions
What is the Advance HCT800 marine gearbox used for?
The Advance HCT800 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 6.43:1 reduction ratio.
What is the rating for the 6.43:1 ratio?
The 6.43:1 ratio option is listed with a 0.85 hp/RPM rating.
What ratio options are available for the Advance HCT800?
Available ratio options include 4.95:1, 5.57:1, 5.68:1, 5.93:1, 6.43:1, 6.86:1, 7.33:1, 7.84:1, and 8.40:1.
What is the maximum input speed?
The maximum input speed is 1800 RPM.
What adaptor plate options are available?
Adaptor plate options include SAE0 and SAE00.
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 18” and 21”.
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 2700 kg.
What is the drop centre?
The drop centre is 450 mm.
What are the dimensions?
The dimensions are 1056 × 1280 × 1425 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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