Advance HC138 Heavy Duty Marine Gearbox 2.52:1 Reduction
Description
Set up for coastal cargo runners, Advance HC138 Marine Transmission modules step down engine rotation across a 2.52:1 reduction ratio. The marine transmission channels 175 continuous horsepower at 2100 input RPM via hydraulic clutch clamping. Cast gray iron housing walls suppress torsional harmonics, shielding gear teeth from cyclic vibration during rough coastal freight transits.
Cast gray iron forms a stiff transmission housing designed to resist gear deflection under heavy continuous bollard tow. Case-hardened 8620 alloy steel helical gears produce silent power conversion with minimal frictional resistance. Multi-disc sintered bronze clutch packs run immersed in pressurized oil for rapid heat removal. External hookups include 1.25-inch raw water ports, SAE 2 bell housings, 7/16-20 JIC pressure gauge taps, 8 quarts oil volume, and a dry weight of 485 lbs.
Key Features of Advance HC138
Fleet operators choose to buy Advance HC138 marine transmission hardware to power displacement freight vessels. This drive train couples straight to medium RPM diesel engines working under strenuous continuous ocean loads.
- A 2.52 to 1 reduction ratio permits the installation of broad four-blade propeller wheels on displacement hulls.
- Hydraulic clutch packs squeeze sintered bronze friction plates to prevent slip during sudden engine throttle transitions.
- Precision ground helical gear teeth transfer up to 435 lb-ft continuous input torque without surface wear.
- An internal positive displacement oil pump maintains hydraulic line pressure between 175 and 215 PSI.
- Advance HC138 transmission cooling jackets route lubricant through external tubular cupronickel heat exchangers.
- Flexible elastomeric coupling elements absorb cyclic engine crankshaft shock before entering the drive pinion shaft.
- Rigid mounting feet cast into the lower housing drop between vessel engine stringers without shimming problems.
Fluid Temperature Pressure Metrics
Internal lubrication pumps produce 195 PSI line pressure during high engine load conditions, preventing clutch pack slip while turning medium wheel diameters. Sump operating temperatures stabilize between 150°F and 180°F through a high-flow cupronickel heat exchanger rejecting 290 BTU per minute. Rated for 435 lb-ft input torque at 2100 continuous engine RPM, this 2.52:1 reduction mechanism optimizes propeller rotation for coastal workboats. Balanced gear ratios lower shaft revolutions to yield steady forward thrust against coastal bay tides.
Companion Hub Bore Specifications
A forged steel companion flange provides a 6.50-inch bolt circle matching six Grade 8 fasteners. Built-in heavy taper roller bearings take up 20 kilonewtons of shaft propeller thrust. The vertical center drop measures 150 mm between engine crankshaft centerline and output shaft, requiring dialed runout alignment below 0.0025 inches.
Lever Selector Service Rules
Gear selection takes place via a three-position mechanical control head that engages forward, neutral, and reverse without delay. This reduction gearbox is not built for racing runabouts or lightweight stepped hulls powered by high-speed gasoline engines. Maintenance procedures demand structured upkeep intervals.
- Verify oil level with the dipstick gauge each shift before firing the main diesel engine.
- Extract and clean the magnetic drain plug plus internal oil suction screen every 250 run hours.
- Pump out old transmission oil down to the bottom and install a fresh filtration cartridge every 12 months.
Commercial Coverage Crate Manifest
The manufacturer includes a 1-Year commercial limited warranty protecting marine buyers against casting or gear machining flaws. Crated shipments contain the complete marine gearbox, flexible input coupling plate, cupronickel tube heat exchanger with oil lines, output companion flange, oil dipstick gauge, and factory shop service documentation.
Advance HC138 Heavy Duty Marine Gearbox Product Overview
The NEW Advance HC138 Heavy Duty Marine Gearbox 2.52:1 Reduction is a compact yet robust marine hydraulic gearbox engineered for commercial marine propulsion systems where drivetrain reliability, correct ratio selection, and professional installation configuration are required.
Built for commercial vessel applications, the Advance HC138 supports installations where the gearbox must be accurately matched between the marine engine and propeller shaft system. This model is configured with a 2.52:1 reduction ratio, making it suitable for propulsion setups requiring controlled engine speed reduction before power reaches the propeller.
For buyers searching for an Advance HC138 marine gearbox, Advance HC138 2.52:1 gearbox, heavy duty marine hydraulic gearbox, or commercial marine gearbox replacement, this unit provides a fitment-focused solution for workboats, marine technicians, vessel owners, shipyards, fleet operators, and commercial repower specialists.
Built for Commercial Marine Applications
The Advance HC138 Heavy Duty Marine Gearbox is designed for commercial marine propulsion environments where the drivetrain must support dependable operation, correct engine matching, and properly selected reduction.
Commercial marine applications may include:
- Workboats
- Fishing vessels
- Passenger vessels
- Utility vessels
- Small commercial craft
- Service vessels
- Fleet repower projects
- New marine propulsion installations
Its hydraulic transmission design supports controlled engagement and dependable power transfer when matched with the correct engine, adaptor plate, drive plate, control system, shafting, propeller, cooling arrangement, and vessel duty cycle.
2.52:1 Reduction Ratio Configuration
This product is specified with a 2.52:1 reduction ratio, one of the available HC138 ratio options.
A marine gearbox reduction ratio determines how engine speed is reduced before reaching the propeller shaft. The correct ratio must be selected based on engine output, propeller size, vessel displacement, hull type, load profile, operating speed, shafting arrangement, and commercial duty requirements.
The 2.52:1 ratio is suitable for applications where the propulsion system requires controlled reduction within the HC138 range while maintaining proper engine-to-propeller matching.
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 2.52:1 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 transfer engine power through the marine drivetrain while supporting controlled clutch engagement and dependable transmission operation.
Hydraulic marine gearboxes are commonly used in commercial vessels because they provide practical drivetrain integration when properly selected and installed. The HC138 is suitable for commercial propulsion systems where gearbox ratio, input speed, adaptor plate size, drive plate size, control type, 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 size
- 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 gearboxs approved input speed range, and the final drivetrain setup should be verified according to the vessels propulsion requirements.
Correct matching of input speed, reduction ratio, engine power, propeller load, and commercial duty cycle helps support dependable gearbox operation and proper propulsion system integration.
SAE Adaptor Plate Option
The NEW Advance HC138 Heavy Duty Marine Gearbox 2.52:1 Reduction is available with an SAE adaptor plate option to support compatible engine installation requirements.
Adaptor plate option:
- SAE1
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 HC138 2.52:1 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 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, ambient conditions, vessel duty cycle, and the cooling arrangement of the installation. Commercial marine applications often require careful temperature management to support stable gearbox operation under load.
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 2.52:1 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 vessels engine, propeller, shafting, mounting arrangement, cooling system, control type, and duty cycle.
Buyers should confirm:
- Advance HC138 gearbox requirement
- 2.52:1 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 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 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 2.52:1 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 2.52:1 Reduction |
| Manufacturer | Advance |
| Model | HC138 |
| Product Type | Heavy Duty Marine Hydraulic Gearbox |
| Primary Application | Commercial Marine Propulsion |
| Selected Ratio | 2.52:1 |
| 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 across listed ratios |
| 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 2.52:1 Reduction is a configurable commercial marine hydraulic gearbox designed for dependable drivetrain applications.
Key details include:
- Advance HC138 heavy-duty marine gearbox
- 2.52:1 reduction ratio
- 0.15 hp/RPM rating for the 2.52:1 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 2.52:1 reduction ratio.
What is the rating for the 2.52:1 ratio
The 2.52:1 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 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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