Sierra 18-6773 Tilt/Trim Motor for Mercury/Mariner 135-250 HP Outboards

The Sierra 18-6773 is a replacement tilt/trim motor for outboard power trim systems, engineered to meet the demands of high horsepower marine engines and to hold up in harsh saltwater and freshwater environments. It is designed to meet or exceed the performance of the original equipment motor it replaces, giving boat owners a dependable way to restore trim and tilt function without sourcing a used or worn-out OEM unit. The motor is finished in white and mounts as an engine-mounted trim motor assembly. Sierra supplies OEM engine manufacturers and boat builders with quality parts, and the 18-6773 is built to that same standard for aftermarket replacement use. This motor is intended for outboards in the 135 to 250 HP range, including XR6 Mag III models, as well as 105-140 HP jet outboard applications, and is suited for most late model Mercury and Mariner outboards from 1996 and later. It is a direct fit-type replacement, making it a straightforward swap for a failed or worn tilt/trim motor. Boat owners repairing power trim or tilt systems can use the 18-6773 to restore reliable up/down trim operation.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6773
• Product Name: Tilt/Trim Motor
• Weight: 4.1 pounds
• Color: White
• Operation Mode: Motor
• Mounting Type: Engine Mount
• Maximum Horsepower: 250 Horsepower
• Recommended Use: Salt water
• UPC: 808282244576

Fitment

• 135, 150, XR6 Mag III, 175, 200, 225, and 250 HP outboards
• 105-140 HP Jet outboards
• Most late model Mercury/Mariner outboards, 1996 and up

Replaces (OEM)

• 878265A4
• Mercury Marine 828708

Frequently Asked Questions

What is the Sierra 18-6773 tilt/trim motor used for? The Sierra 18-6773 is a replacement motor for an outboard's power tilt/trim system, restoring the up/down trim function on a failed or worn-out original motor.

Which outboards does the 18-6773 fit? It fits 135, 150, XR6 Mag III, 175, 200, 225, and 250 HP outboards, as well as 105-140 HP jet outboards, and is suited for most late model Mercury/Mariner outboards from 1996 and up.

Does the 18-6773 replace Mercury Marine 828708? Yes, the Sierra 18-6773 is a cross-reference replacement for Mercury Marine part 828708 and OEM number 878265A4.

What color is the 18-6773 tilt/trim motor? It is finished in white.

How much does the 18-6773 tilt/trim motor weigh? The 18-6773 weighs 4.1 pounds.

Is the 18-6773 a genuine Mercury part or an aftermarket replacement? The 18-6773 is a Sierra-brand aftermarket replacement, built to meet or exceed the performance of the original Mercury Marine trim motor it replaces.

Is this motor rated for saltwater use? Yes, the 18-6773 is recommended for salt water use in addition to freshwater applications.

How does the 18-6773 mount on the outboard? It is an engine-mounted trim motor, installing directly onto the outboard's power trim/tilt system in place of the original motor.

What is the maximum horsepower rating for the 18-6773? The 18-6773 is rated for outboards up to 250 horsepower.

Will the 18-6773 fit a 1990 Mercury outboard? The 18-6773 is intended for most late model Mercury/Mariner outboards from 1996 and up, so an outboard predating that range may not be a match.