Advance 300 Heavy Duty Marine Gearbox 4.94:1 Reduction
Description
Optimized for offshore dredge operations, Advance 300 Marine Reduction Gearbox models drop diesel engine revs via a 4.94:1 gear ratio. The transmission manages 290 continuous horsepower at 1800 input RPM with wet hydraulic clutches. Thick nodular iron casing walls protect rotating components from hull twist while maneuvering sand barges through turbulent ocean surf.
High-strength ductile iron provides a rigid transmission framework that resists shaft deflection under continuous bollard tow. Carburized helical gear sets ground to AGMA 11 standards isolate gear noise and prevent tooth scuffing under severe loads. Multi-plate sintered bronze clutch discs feature radial grooves that circulate cooling oil under pressure. Equipment interfaces include SAE 1 bell housing mountings, 7/16-20 JIC hydraulic test ports, 1.50-inch cooling lines, 19 quarts oil capacity, and 1,300 lbs dry weight.
Key Features of Advance 300
Marine contractors prefer to buy Advance 300 marine gearbox packages when outfitting heavy displacement split-hopper barges. The drivetrain supports continuous duty marine diesels working day and night in harsh ocean conditions.
- A 4.94 to 1 reduction ratio yields high torque output to swing heavy pitch propellers on displacement hulls.
- Wet clutch plates squeeze sintered bronze discs to lock drive shafts without slippage during heavy towing.
- High-tensile helical gear teeth handle 845 lb-ft continuous input torque with minimal gear wear.
- A mechanical shift control valve regulates internal circuit oil pressure between 290 and 340 PSI.
- Advance 300 transmission oil pathways direct fluid through a shell-and-tube cupronickel heat exchanger.
- Torsional rubber drive elements isolate diesel crankshaft vibration before it hits internal input shafts.
- Precision SAE 1 housing bolt holes mate straight to standard commercial diesel engine bell flanges.
Torque Transmission Reduction Boundaries
A built-in hydraulic gear pump feeds 315 PSI operating pressure, clamping multi-disc clutches tight against slippage under maximum diesel throttle. Continuous input torque reaches 845 lb-ft at 1800 engine RPM under commercial heavy duty vessel standards. Lubricant sump temperatures stay within 150°F to 185°F through a seawater-fed heat exchanger rejecting 440 BTU each minute. The 4.94:1 reduction ratio slows shaft revolutions, allowing commercial workboats to spin broad wheel diameters that produce maximum bollard pull while dragging heavily loaded dredges.
Thrust Bearing Flange Tolerances
The output companion flange exhibits an outside diameter of 10.25 inches with six bolt holes located on an 8.75-inch circle. An integrated heavy thrust bearing absorbs 44 kilonewtons of continuous forward prop thrust. Alignment technicians keep shaft runout within 0.002 inches across the 240 mm vertical center drop.
Valve Operation Service Guidelines
Mechanical control levers actuate internal hydraulic spools to switch between forward, neutral, and reverse positions without delay. This heavy marine transmission is not intended for high-speed sport fishing boats or light planing craft running gasoline powerplants above 2500 RPM. Preventive care follows precise running periods.
- Inspect transmission fluid levels on the dipstick each shift prior to operating the main diesel engine.
- Clean out the magnetic drain plug and internal wire mesh suction screen every 250 operational hours.
- Drain used lubricant from the sump down to empty and replace the spin-on filter every 12 months.
Purchased Unit Crate Contents
The builder provides a 1-Year commercial limited warranty covering materials and machining against unexpected mechanical breakdown. Crated packages include the complete marine gearbox, flexible torsional input coupling, cupronickel oil cooler unit with mounting hardware, companion flange, transmission dipstick gauge, and comprehensive technical installation instructions.
Advance 300 Heavy Duty Marine Gearbox Product Overview
The NEW Advance 300 Heavy Duty Marine Gearbox 4.94:1 Reduction is a robust marine hydraulic gearbox engineered for commercial marine propulsion systems where drivetrain strength, correct ratio selection, and professional installation configuration are required.
Built for demanding vessel applications, the Advance 300 supports installations where the gearbox must be accurately matched between the marine engine and propeller shaft system. This model is configured with a 4.94:1 reduction ratio, making it suitable for commercial propulsion setups requiring controlled engine speed reduction before power reaches the propeller.
For customers searching for an Advance 300 marine gearbox, Advance 300 4.94:1 gearbox, heavy duty marine hydraulic gearbox, or commercial marine gearbox with Live PTO option, 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 300 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 vessels
- 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, propeller requirements, and optional PTO requirements.
4.94:1 Reduction Ratio Configuration
This product is specified with a 4.94:1 reduction ratio, one of the available Advance 300 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 4.94:1 ratio is suitable for applications where the propulsion system requires controlled reduction for correct propeller operation and drivetrain matching.
Available Advance 300 ratio options include:
| Ratio Option | Rating |
|---|---|
| 1.87:1 | 0.35 hp/RPM |
| 2.04:1 | 0.35 hp/RPM |
| 2.54:1 | 0.35 hp/RPM |
| 3.00:1 | 0.33 hp/RPM |
| 3.53:1 | 0.30 hp/RPM |
| 4.10:1 | 0.25 hp/RPM |
| 4.47:1 | 0.25 hp/RPM |
| 4.61:1 | 0.25 hp/RPM |
| 4.94:1 | 0.20 hp/RPM |
| 5.44:1 | 0.17 hp/RPM |
This page is specifically for the 4.94:1 reduction configuration with a 0.20 hp/RPM rating.
Heavy Duty Hydraulic Marine Transmission
The Advance 300 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 Advance 300 is intended for heavy-duty commercial propulsion requirements where gearbox weight, drop centre, ratio selection, input speed, PTO configuration, 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
- Optional Live PTO requirement
- Vessel duty cycle and operating profile
The gearbox should always be matched to the engine, vessel, propeller, auxiliary equipment, and duty cycle by a qualified marine technician or propulsion specialist.
Maximum Input Speed of 2500 RPM
The Advance 300 marine gearbox is rated with a maximum input speed of 2500 RPM.
This specification is important when matching the gearbox to the engine. The selected engine must operate within the gearboxs approved input speed range, and the final drivetrain setup should be verified according to the vessels propulsion requirements.
For commercial applications, correct matching of input speed, reduction ratio, propeller load, PTO demand, and duty rating helps support dependable gearbox operation and proper propulsion system integration.
SAE Adaptor Plate Options
The NEW Advance 300 Heavy Duty Marine Gearbox 4.94:1 Reduction is available with SAE adaptor plate options to support different engine installation requirements.
Adaptor plate options include:
- SAE1
- SAE0
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 300 4.94:1 marine gearbox can be configured with different control options depending on the vessels 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 vessels helm controls, control cables, electronic interface, and overall propulsion setup.
Drive Plate Options
The Advance 300 is available with multiple drive plate options to support different engine and gearbox connection requirements.
Available drive plate sizes include:
- 14 drive plate
- 16 drive plate
- 18 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.
Live PTO Option
The Advance 300 Heavy Duty Marine Gearbox is available with an option for Live PTO.
A Live PTO option can support auxiliary power requirements in compatible commercial marine applications, depending on the vessels setup and equipment needs. This may be important for operators requiring power take-off capability for approved auxiliary systems.
The Live PTO requirement should be confirmed before ordering, as PTO configuration can affect gearbox specification, installation planning, auxiliary equipment compatibility, and final system layout.
Gearbox Oil Cooler Option
The Advance 300 Heavy Duty Marine Gearbox also 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, PTO load, and transmission demand require additional temperature management. Cooling requirements should be confirmed based on the vessels 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 300 Heavy Duty Marine Gearbox 4.94:1 Reduction is suitable for commercial repower projects, gearbox replacement, and new vessel installations requiring a heavy-duty hydraulic transmission with optional PTO capability.
During a repower or replacement project, the gearbox must be matched carefully to the vessels engine, propeller, shafting, mounting arrangement, cooling system, control type, PTO requirements, and duty cycle.
Buyers should confirm:
- Advance 300 gearbox requirement
- 4.94:1 reduction ratio
- 0.20 hp/RPM rating requirement
- SAE1 or SAE0 adaptor plate
- Mechanical or electronic control
- 14, 16, or 18 drive plate
- Live PTO requirement
- 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 300 marine gearbox should be installed according to manufacturer specifications and matched carefully with the vessels 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, Live PTO configuration, 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, PTO mismatch, premature wear, or incorrect gearbox selection.
Worldwide Marine Equipment Supply
The NEW Advance 300 Heavy Duty Marine Gearbox 4.94:1 Reduction is suitable for customers requiring professional commercial marine gearbox supply.
With experience shipping marine engines, transmissions, gearboxes, propulsion components, PTO 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 300 Heavy Duty Marine Gearbox 4.94:1 Reduction |
| Manufacturer | Advance |
| Model | 300 |
| Product Type | Heavy Duty Marine Hydraulic Gearbox |
| Primary Application | Commercial Marine Propulsion |
| Selected Ratio | 4.94:1 |
| Selected Ratio Rating | 0.20 hp/RPM |
| Available Ratio Options | 1.87:1, 2.04:1, 2.54:1, 3.00:1, 3.53:1, 4.10:1, 4.47:1, 4.61:1, 4.94:1, 5.44:1 |
| Rating Options | 0.35 hp/RPM, 0.33 hp/RPM, 0.30 hp/RPM, 0.25 hp/RPM, 0.20 hp/RPM, 0.17 hp/RPM depending on ratio |
| Maximum Input Speed | 2500 RPM |
| Adaptor Plate Options | SAE1, SAE0 |
| Control Options | Mechanical, Electronic |
| Drive Plate Options | 14, 16, 18 |
| Live PTO | Optional |
| Gearbox Oil Cooler | Optional |
| Weight | 740 kg |
| Drop Centre | 264 mm |
| Dimensions | 638 870 864 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 300 Heavy Duty Marine Gearbox 4.94:1 Reduction is a configurable commercial marine hydraulic gearbox designed for heavy-duty drivetrain applications.
Key details include:
- Advance 300 heavy-duty marine gearbox
- 4.94:1 reduction ratio
- 0.20 hp/RPM rating for the 4.94:1 option
- 2500 RPM maximum input speed
- SAE1 and SAE0 adaptor plate options
- Mechanical or electronic control options
- 14, 16, and 18 drive plate options
- Optional Live PTO
- Optional gearbox oil cooler
- 740 kg gearbox weight
- 264 mm drop centre
- 638 870 864 mm dimensions
- Designed for commercial marine applications
This gearbox should be selected only when the engine, vessel, control system, PTO requirement, ratio, mounting arrangement, and drivetrain requirements match the Advance 300 specification.
Frequently Asked Questions
What is the Advance 300 marine gearbox used for
The Advance 300 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 4.94:1 reduction ratio.
What is the rating for the 4.94:1 ratio
The 4.94:1 ratio option is listed with a 0.20 hp/RPM rating.
What ratio options are available for the Advance 300
Available ratio options include 1.87:1, 2.04:1, 2.54:1, 3.00:1, 3.53:1, 4.10:1, 4.47:1, 4.61:1, 4.94:1, and 5.44:1.
What is the maximum input speed
The maximum input speed is 2500 RPM.
What adaptor plate options are available
Adaptor plate options include SAE1 and SAE0.
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 14, 16, and 18.
Is Live PTO available
Yes. The Advance 300 has an option for Live PTO.
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 740 kg.
What is the drop centre
The drop centre is 264 mm.
What are the dimensions
The dimensions are 638 870 864 mm.
Should compatibility be verified before purchase
Yes. Buyers should verify engine compatibility, ratio requirement, adaptor plate type, drive plate size, control option, Live PTO requirement, oil cooler requirement, shaft alignment, mounting arrangement, and vessel duty cycle before purchase.
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