Advance HC138 Heavy Duty Marine Gearbox 4.45:1 Reduction

Match trawler or small-tug propulsion with the Advance HC138 Heavy Duty Marine Gearbox 4.45:1 Reduction. This heavy-duty marine transmission is specified for commercial trawlers and small tugboats, with a 4.45:1 reduction ratio, maximum input power of 335 HP (250 kW) at 2,500 RPM, and a maximum input speed of 2,500 RPM.

Model HC138-445 uses a hydraulic multi-disc clutch and provides a listed transmission capacity of 0.13 HP/RPM (0.10 kW/RPM). Its supplied drivetrain data includes SAE 1 and SAE 2 bell housing standards, 7,868 lbf (35,000 N) maximum propeller thrust, an 8.86-inch (225 mm) center distance, and a 3.17-gallon (12-liter) oil capacity.

Fitment and Propulsion Use

The Advance HC138-445 is specified for commercial trawlers and small tugboats. It supports propulsion systems requiring a 4.45:1 reduction ratio, subject to matching the engine’s rated torque, operating RPM, SAE 1 or SAE 2 bell housing interface, propeller-thrust requirement, and complete shaft arrangement. Confirm fitment using the engine model, serial number, rated torque, operating RPM, reduction ratio, and manufacturer drivetrain documentation before ordering.

Before Ordering the Advance HC138

Verify that Advance model HC138-445 is correct for your commercial trawler or small-tugboat propulsion system. Confirm the 4.45:1 reduction ratio, 0.13 HP/RPM (0.10 kW/RPM) transmission capacity, 335 HP (250 kW) maximum input power at 2,500 RPM, 2,500 RPM maximum input speed, hydraulic multi-disc clutch, SAE 1/SAE 2 bell housing options, 7,868 lbf (35,000 N) maximum propeller thrust, 8.86-inch center distance, 3.17-gallon oil capacity, 25.5 x 24.0 x 31.0 inch dimensions, 837 lb dry weight, CCS/ZC approval, and 1-year limited warranty. Confirm compatibility with your engine manufacturer’s documentation before purchase.