The Golden SEA-Drive is the finest drive unit ever introducted for a boat lift system. The "SEA-Drive" enclosed flat plate lift system is driven by an oil bath gear reducer. Our system incorporates the gear box directly to the driveshaft, powered by either a 3/4 hp, 1 hp, or a 1 1/2 hp motor.

General Description

The SEA-Drive is a double-reduction worm gear reducer contained in a single housing. It was designed specifically for a boatlift application. The input is a NEMA 56C to allow mounting a standard electric motor directly onto the reducer. The output is a hollow shaft design that is sized to accommodate a standard 2-inch pipe. The connection to the pipe utilizes the cross bolt identical to the current Flat Plate design. This design provides maintenance-free service without grease lubrication intervals or belt drive adjustments.


The housing is a cast-aluminum for light weight and corrosion resistance in salt water and humid environments. The housing is designed to provide separate lubrication reservoirs for the high-speed and low-speed gear sets to ensure proper lubrication without having to overfill. The housing is non-vented to prevent buildup of condensation inside the reducer in humid environments.


The high-speed gear set is a 5:1 for high efficiency. It utilizes a production gear set from an industrial product line designed to SEA-Drive specifications. The worm is made from a heat-treated alloy steel and meshes with a bronze worm gear.

The low-speed gear set is a high-ratio (96:1) designed to have an extremely low helix angle to prevent any possibility of backdrifting. The large center distance of the low-speed gear set results in lower tooth loads for a given output torque.



Shafts and gears are supported by deep grove ball bearings to provide precision positioning and high efficiency. The low-speed worm bearings are pre-lubricated and shielded to ensure proper lubrication and contain the lubricant in the high-speed cavity.


The SEA-Drive reducer is factory filled with a proven high-quality lubricant. This high-viscosity grease is capable of handling the high shear stress inherent in worm gear products. The semi-fluid grease greatly reduces the potential for leakage.


The SEA-Drive reducer utilizes spring-loaded duel-lip oil seals. The dual-lip design helps protect the sealing lip from outside contaminants and shaft corrosion. The spring-loaded sealing lips are more than capable of handling the small internal pressure that may result from the temperature changes that occur throughout the year.


The SEA-Drive is shaft-mounted with a flange to accommodate a torque arm connection to resist rotation of the housing. This allows a flexible mounting system so the housing can move with the shaft without binding. This eliminates the need for a precise machined mounting surface to secure the housing to the frame.

Here are some of the distinct advantages of the "SEA-Drive" Lift System.

1.  Specifically designed for boat lift applications.
2.  Five year manufacturers warranty on gears, seals and housing.
3.  Painted motors are protected with a plastic cover.
4.  Optional Stainless Steel motors for a great appearance and longest life possible.
5.  No backdrift potential.
6.  Electrical harness designed for boat lifts.
7.  Smoothest noise free operation.
8.  Maintenance free, enclosed gears.
9.  The SEA-Drive eliminates the chance of failure due to belt slipage or chain failure.
10. Grease level inspection port.
11. The motor is located above the cable spool.

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