Boat Lift Motor & Gearbox Replacement

Motors & Gearboxes: what it involves

The motor is the hardest-working part of a boat lift, and in Southwest Florida it's also the most exposed. It sits a few feet above salt water, gets splashed every time a boat goes by, and bakes in the sun. Most lift motors are single-phase units that need a start capacitor to get moving, then a gearbox that trades speed for the torque it takes to raise several thousand pounds of boat.

When a lift goes quiet, the motor gets blamed first, but it isn't always the culprit. A failed capacitor makes a good motor hum without turning. A stripped gearbox lets the motor spin while the shaft stays still. A worn coupler or keyway slips under load. A motor that really has burned out usually shows it: a burnt smell, a tripped breaker, or windings that test open. The replacement has to match the lift's capacity, shaft and voltage, and on a two-motor lift both sides need to pull together.

Signs the motor or gearbox is failing

• The motor hums but the lift doesn't move
• The motor runs but the shaft doesn't turn
• A burnt smell or the breaker trips on start
• Grinding or knocking from the gearbox housing
• Rust or water inside the motor cover

Common methods

Does a motor swap need a permit?

A like-for-like motor or gearbox swap on an existing lift is normally repair work. New circuits, a move to a different voltage, or rewiring the feed from the house are electrical work that the building office for your parcel may want permitted. Charlotte County, for example, requires an electrical permit for all new lifts. Ask your tech how the wiring will be handled before work starts.

How a motor and gearbox job usually goes

1. Confirm the failureThe tech tests the capacitor, switch and windings before anything is ordered.
2. Match the partHorsepower, shaft size, mounting and voltage are matched to your lift's capacity.
3. Support the loadIf the boat is up, the lift is secured so nothing drops while the drive is out.
4. Install and wireThe new motor or gearbox is mounted, aligned and wired with marine-grade connections.
5. Test both directionsThe lift runs up and down under load; on two-motor lifts, both sides are checked for even speed.

On a two-motor lift, ask whether the second motor is near the end of its life too. Replacing a matched pair keeps both sides lifting evenly.

What motor and gearbox work costs

Price depends on the lift's capacity, the motor brand and whether the gearbox goes too. HomeAdvisor puts general lift repairs at about $175 to $500; a new motor or gearbox is usually above that once the part is included. Your tech should price the part and the labor separately. See the full cost guide.

Reference figure, not a quote: HomeAdvisor boat dock repair cost guide, checked November 2026.

Where motor calls come from most

• Cape CoralOlder lifts in the southeast and southwest canals
• Port CharlotteMany lifts are 15 to 20 years old
• Fort Myers BeachSalt spray and storm-flooded motors
• SanibelBay-side lifts with heavy salt exposure
• Punta GordaHeavy boats on high-capacity lifts
• EnglewoodLemon Bay docks open to wind and spray

Related services: Boat Lift Repair, Boat Lift Switch, Remote & Wiring Repair, Boat Lift Maintenance & Inspections.