Advance 300 Heavy Duty Marine Gearbox 5.44:1 Reduction
Description
Built to swing ultra wide propellers, Advance 300 Heavy Marine Gearbox units reduce diesel driveshaft output across a deep 5.44:1 reduction ratio. The gearbox transfers 260 continuous horsepower at 1800 input RPM with wet hydraulic clutch packs. Stiff iron casings prevent shaft gear deflection while dragging massive trawler doors along muddy ocean floors.
Ductile iron casting provides superior housing strength to counteract extreme shaft bending moments under full continuous bollard tow. Carburized 8620 steel helical gear teeth undergo fine profile grinding to run cool without pitting wear. Sintered bronze friction plates incorporate continuous oil pathways to shed heat under continuous load. Utilities feature an SAE 1 engine flywheel bell, 7/16-20 JIC diagnostic test ports, 1.50-inch cooling water barbs, 19 quarts oil volume, and 1,320 lbs dry weight.
Key Features of Advance 300
Commercial fishing cooperatives prefer to buy Advance 300 marine gearbox units when constructing deep water scallop dredgers. This mechanical propulsion package sustains continuous diesel output across non-stop offshore fishing voyages.
- A deep 5.44 to 1 reduction ratio turns oversized propellers to create immense low-speed water push.
- Wet multi-disc clutch packs maintain positive mechanical contact under continuous heavy towing operations.
- Precision helical gear wheels channel 760 lb-ft continuous input torque without experiencing metal stress.
- An internal hydraulic valve holds steady line pressure between 290 and 340 PSI across operating bands.
- Advance 300 transmission oil cooling lines connect straight to an external cupronickel heat exchanger.
- Elastomeric input couplings cushion engine torsional vibration before power enters the reduction gear set.
- Rigid SAE 1 housing bolt geometry mounts clean against commercial marine diesel flywheel housings.
Deep Reduction Mechanical Ratings
Internal transmission pumps maintain 320 PSI line pressure during high engine load conditions, holding sintered bronze clutches locked against slip under heavy resistance. The unit takes 760 lb-ft continuous input torque at 1800 engine RPM under continuous duty commercial service codes. Sump oil temperature holds between 150°F and 185°F, supported by a marine cooler that sheds 450 BTU per minute into raw sea water. The deep 5.44:1 reduction ratio maximizes propeller wheel diameter, creating tremendous bollard pull for coastal tugs and scallop boats.
Shaft Hub Runout Tolerances
A heavy output companion flange presents a 10.25-inch diameter with six holes positioned on an 8.75-inch pitch diameter. An integrated spherical thrust bearing takes up 45 kilonewtons of forward propeller thrust. Technicians align companion couplings to under 0.002 inches of runout across the 240 mm vertical center drop distance.
Shift Lever Preventive Routines
A mechanical detent lever directs pressurized oil to clutch packs, selecting forward, neutral, and reverse directions without hesitating during tight docking work. This heavy reduction gear is not built for high-speed sport cruisers or light planing boats driven by gasoline engines over 2500 RPM. Preventive upkeep protects internal gear trains.
- Inspect fluid level on the bayonet dipstick each shift prior to engaging the marine diesel.
- Extract and wash the stainless steel suction strainer screen clean every 250 operating hours.
- Drain all old sump fluid down to empty and install a new oil filter cartridge every 12 months.
Shipment Manifest Warranty Coverage
The equipment includes a 1-Year commercial limited warranty against factory defects in casting metallurgy or precision gear teeth. Factory crates include the bare marine gearbox, flexible flywheel drive coupling, external cupronickel oil heat exchanger with lines, companion flange, fluid dipstick gauge, and comprehensive technical workshop documentation.
Advance 300 Heavy Duty Marine Gearbox Product Overview
The NEW Advance 300 Heavy Duty Marine Gearbox 5.44:1 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 5.44:1 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 5.44:1 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.
5.44:1 Reduction Ratio Configuration
This product is specified with a 5.44:1 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 5.44:1 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 5.44:1 reduction configuration with a 0.17 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 5.44:1 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 5.44:1 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 5.44:1 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
- 5.44:1 reduction ratio
- 0.17 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 5.44:1 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 5.44:1 Reduction |
| Manufacturer | Advance |
| Model | 300 |
| Product Type | Heavy Duty Marine Hydraulic Gearbox |
| Primary Application | Commercial Marine Propulsion |
| Selected Ratio | 5.44:1 |
| Selected Ratio Rating | 0.17 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 5.44:1 Reduction is a configurable commercial marine hydraulic gearbox designed for heavy-duty drivetrain applications.
Key details include:
- Advance 300 heavy-duty marine gearbox
- 5.44:1 reduction ratio
- 0.17 hp/RPM rating for the 5.44:1 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 5.44:1 reduction ratio.
What is the rating for the 5.44:1 ratio
The 5.44:1 ratio option is listed with a 0.17 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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