Advance D300A Heavy Duty Marine Gearbox 6.56:1 Reduction

Pair harbor-duty propulsion with the Advance D300A Heavy Duty Marine Gearbox 6.56:1 Reduction. This heavy-duty marine transmission is specified for harbor tugs and commercial fishing applications, with a 6.56:1 reduction ratio, maximum input power of 737 HP (550 kW) at 2,400 RPM, and a maximum input speed of 2,400 RPM.

Model D300A-656 has a hydraulic power-shift clutch and a listed transmission capacity of 0.31 HP/RPM (0.23 kW/RPM). Its stated drivetrain specifications include SAE 0 and SAE 00 bell housing standards, 15,736 lbf (70,000 N) maximum propeller thrust, a 13.78-inch (350 mm) center distance, and a 5.28-gallon (20-liter) oil capacity.

Fitment and Propulsion Use

The Advance D300A-656 is specified for harbor tugs and commercial fishing vessels. It supports propulsion systems requiring a 6.56:1 reduction ratio, with the listed 737 HP maximum input rating at 2,400 RPM, 2,400 RPM input-speed limit, and SAE 0 or SAE 00 bell housing interface. Confirm fitment using the engine model, serial number, rated torque, operating RPM, reduction ratio, and manufacturer drivetrain documentation before ordering.

Before Ordering the Advance D300A

Verify that Advance model D300A-656 matches your harbor tug or commercial fishing vessel propulsion system. Confirm the 6.56:1 reduction ratio, 0.31 HP/RPM (0.23 kW/RPM) transmission capacity, 737 HP (550 kW) maximum input power at 2,400 RPM, 2,400 RPM maximum input speed, hydraulic power-shift clutch, SAE 0/SAE 00 bell housing options, 15,736 lbf (70,000 N) maximum propeller thrust, 13.78-inch center distance, 5.28-gallon oil capacity, 36.0 x 32.5 x 45.0 inch dimensions, 1,940 lb dry weight, CCS/ZC (ABS grade) classification, and 1-year limited warranty. Confirm compatibility with your engine manufacturer’s documentation before purchase.