Advance HC138 Heavy Duty Marine Gearbox 2.00:1 Reduction
Description
Matched to medium commercial fishing hulls, Advance HC138 Marine Gearbox units transfer continuous diesel torque through a 2.00:1 reduction ratio. The compact driveline package accepts 190 continuous horsepower at 2100 input RPM with wet multi-disc clutches. Rigid iron casing walls isolate gear shafts from engine stringer twist while powering wooden and fiberglass lobster vessels.
High-tensile gray iron forms the transmission housing to absorb driveline shock loads and minimize gear noise. Helical gears cut from case-hardened alloy steel feature shaved tooth profiles that minimize friction across fast input speeds. Multi-disc sintered bronze clutch packs run in pressurized oil circuits for rapid thermal management. Housing options feature SAE 2 or SAE 3 bell configurations, 7/16-20 JIC test ports, 1.25-inch raw water connections, 8 quarts oil volume, and 480 lbs dry weight.
Key Features of Advance HC138
Boatbuilders choose to buy Advance HC138 marine gearbox units when repowering coastal lobster boats and passenger water taxis. This compact mechanical package matches medium displacement marine diesels requiring dependable forward and reverse propulsion.
- A 2.00 to 1 reduction ratio provides fast shaft revolutions for semi-displacement hulls running medium speeds.
- Wet multi-plate clutch packs grip sintered bronze discs for swift engagement under continuous throttle.
- Precision helical gear teeth transfer 475 lb-ft continuous input torque without surface tooth distress.
- A mechanical shift valve maintains clutch line oil pressure between 175 and 215 PSI in operation.
- Advance HC138 transmission fluid channels route lubricant through a compact cupronickel tube heat exchanger.
- Rubber block input couplings isolate engine crankshaft vibration before power enters the reduction pinion.
- SAE 2 bell housing flanges provide direct bolt alignment to commercial diesel flywheel cases.
Medium Driveline Hydraulic Limits
Transmission oil pumps generate 195 PSI main circuit pressure during full throttle cruise, locking multi-disc clutches tight against rotational slip. The drive unit manages 475 lb-ft continuous input torque at 2100 engine RPM under commercial vessel ratings. Operating sump temperatures hold steady between 150°F and 180°F through a marine heat exchanger shedding 280 BTU each minute. The 2.00:1 reduction ratio provides an ideal balance of propeller rotational speed and cruise velocity for workboats crossing coastal bays.
Propeller Shaft Flange Geometry
The forged steel output companion flange features a 7.87-inch diameter with six bolt holes set on a 6.50-inch pitch circle. An integrated spherical roller thrust bearing holds 20 kilonewtons of continuous shaft push. Technicians maintain shaft runout within 0.002 inches across the 150 mm vertical center drop distance.
Sump Screen Maintenance Regimen
A positive mechanical detent lever directs hydraulic fluid into forward, neutral, and reverse clutch channels without hesitation. This mechanical gearbox is not engineered for light speedboats or recreational catamarans fitted with high-revving gasoline engines. Technicians follow strict servicing schedules.
- Check oil levels on the threaded dipstick gauge each shift before starting main propulsion diesels.
- Remove and wash the stainless steel suction strainer mesh every 250 hours of engine service.
- Drain the oil sump clean and spin on a new micro-glass oil filter every 12 months.
Base Package Warranty Documentation
The factory provides a 1-Year commercial limited warranty against structural defects in iron castings or gear sets. Shipments contain the bare marine gearbox, flexible flywheel drive element, cupronickel oil heat exchanger with hoses, output companion coupling flange, oil dipstick gauge, and an extensive technical service manual.
Advance HC138 Heavy Duty Marine Gearbox Product Overview
The NEW Advance HC138 Heavy Duty Marine Gearbox 2.00:1 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 2.00:1 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 2.00:1 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.
2.00:1 Reduction Ratio Configuration
This product is specified with a 2.00:1 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 2.00:1 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 2.00:1 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 2.00:1 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 2.00:1 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 2.00:1 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
- 2.00:1 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 2.00:1 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 2.00:1 Reduction |
| Manufacturer | Advance |
| Model | HC138 |
| Product Type | Heavy Duty Marine Hydraulic Gearbox |
| Primary Application | Commercial Marine Propulsion |
| Selected Ratio | 2.00:1 |
| 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 2.00:1 Reduction is a configurable commercial marine hydraulic gearbox designed for dependable drivetrain applications.
Key details include:
- Advance HC138 heavy-duty marine gearbox
- 2.00:1 reduction ratio
- 0.15 hp/RPM rating for the 2.00:1 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 2.00:1 reduction ratio.
What is the rating for the 2.00:1 ratio
The 2.00:1 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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