Advance MB270A Marine Gearbox 5.12:1 Reduction

Description

Match a vertical-offset propulsion layout with the Advance MB270A Marine Gearbox 5.12:1 Reduction. This vertical-offset inboard marine transmission is specified for coastal transport ferries, mid-size workboats, heavy river tugs, and high-load displacement vessels with 35 to 75 ft hulls, using a 5.12:1 mid-range deep-reduction ratio.

Model MB270A-5.12 uses a hydraulic multi-disc wet clutch with the stated smooth-handshake shifting and is rated for 326 HP (240 kW). It has a maximum input torque of 676 lb-ft (917 N·m), a maximum rated speed of 2,500 RPM, and a 0-degree parallel vertical-offset output-shaft arrangement.

Key Features of Advance MB270A

• 5.12:1 mid-range deep-reduction ratio identifies the stated propulsion speed-reduction configuration.
• Vertical-offset inboard marine transmission configuration defines the listed drivetrain layout.
• 326 HP (240 kW) maximum input power rating identifies the stated engine-input capacity.
• 2,500 RPM maximum rated operating speed defines the listed input-speed limit.
• 676 lb-ft (917 N·m) maximum input torque provides the stated torque capacity.
• Hydraulic multi-disc wet clutch identifies the listed clutch construction.
• 0-degree parallel vertical-offset center-axis arrangement defines the supplied output-shaft geometry.
• Mechanical cable shift lever is listed, with optional 24V DC electronic solenoid actuators.
• SAE 30 or SAE 40 heavy-duty marine engine gear oil is specified, with a 10.0-quart (9.5-liter) baseline fill.
• Integrated raw-water-cooled coaxial shell-and-tube heat exchanger pack is listed for cooling.

Fitment and Propulsion Use

The Advance MB270A-5.12 is specified for primary propulsion transmission lines on coastal transport ferries, mid-size workboats, heavy river tugs, and high-load displacement vessels with 35 to 75 ft hulls. It supports a 5.12:1 reduction ratio and a 0-degree parallel vertical-offset output configuration. Confirm fitment using the engine model, serial number, rated torque, operating RPM, reduction ratio, and manufacturer drivetrain documentation before ordering.

Installation and Service Considerations

Verify the SAE 2 or SAE 3 housing compatibility grid, 0-degree vertical-offset shaft arrangement, 8.27-inch (210 mm) output flange, mechanical shift-cable routing or selected optional 24V DC solenoid actuator, raw-water cooling connection, and 261 to 319 psi (1.8 to 2.2 MPa) hydraulic line-pressure requirement. The supplied data lists SAE 30 or SAE 40 oil and a 10.0-quart baseline fill. A mechanical low-speed trolling bypass option is listed as available. Follow the engine and gearbox manufacturer’s installation manuals and product instructions for alignment, lubrication, controls, cooling connections, and service procedures.

Before Ordering the Advance MB270A

Verify that Advance model MB270A-5.12 matches your coastal transport ferry, mid-size workboat, heavy river tug, or high-load displacement-vessel propulsion system. Confirm the 5.12:1 deep-reduction ratio, vertical-offset inboard configuration, 326 HP (240 kW) maximum input rating, 2,500 RPM maximum input speed, 676 lb-ft (917 N·m) maximum input torque, hydraulic wet multi-disc clutch, 0-degree parallel vertical-offset output, mechanical cable shift with optional 24V DC solenoid actuators, SAE 2/SAE 3 housing grid, 8.27-inch output flange, SAE 30 or SAE 40 oil requirement, 10.0-quart baseline fill, raw-water-cooled heat exchanger, listed trolling-bypass availability, 749.5 lb dry weight, and stated 35 to 75 ft hull application. Confirm compatibility with your engine manufacturer’s documentation before purchase.