Sierra Hinge Pin 18-1705 - Replaces 77123, 77123A1, 65547 - Gimbal Housing for Alpha Gen II and Bravo

The Sierra Hinge Pin 18-1705 is a replacement hinge pin for the gimbal housing on Alpha Gen II and Bravo sterndrives. It is built from metal for durability in the marine environment and is designed to meet or exceed the performance of the original equipment part it replaces. This hinge pin secures the gimbal housing to the transom assembly, and correct fitment matters for proper steering and trim function, so installers should confirm the serial number range and drive model before ordering.

This part is designed to fit Alpha Gen II units with serial number 0M85639 and up, as well as all Bravo models equipped with a trim sender. Sierra manufactures this hinge pin as a direct cross-reference replacement for the OEM numbers 77123, 77123A1, and 65547, making it a straightforward swap when the original hinge pin is worn, corroded, or damaged. As with other Sierra replacement parts, it is engineered to hold up under the demands of high-horsepower engines and the harsh marine operating environment.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1705
• Product Name: Hinge Pin
• Application: Gimbal Housing
• Material: Metal
• Weight: 0.13 pounds
• UPC: 808282186609

Fitment

• Alpha Gen II, S/N 0M85639 & UP
• Bravo, All Models with trim sender

Replaces (OEM)

• 77123
• 77123A1
• 65547

Frequently Asked Questions

What is the Sierra 18-1705 hinge pin used for? It is a hinge pin for the gimbal housing on Alpha Gen II and Bravo sterndrives, securing the gimbal housing so the drive can steer and trim correctly.

Will hinge pin 18-1705 fit an Alpha Gen II drive? Yes, but only on Alpha Gen II units with serial number 0M85639 and up; earlier serial numbers are not covered by this part.

Does 18-1705 fit Bravo drives? It fits all Bravo models equipped with a trim sender.

What OEM part numbers does the Sierra 18-1705 hinge pin replace? It cross-references to OEM numbers 77123, 77123A1, and 65547.

Is the 18-1705 hinge pin genuine OEM or aftermarket? The 18-1705 is a Sierra aftermarket replacement part engineered to meet or exceed the performance of the original 77123/77123A1/65547 hinge pin it replaces.

What material is the 18-1705 hinge pin made from? This hinge pin is made from metal for durability in marine use.

How much does the Sierra 18-1705 hinge pin weigh? It weighs 0.13 pounds.

How many hinge pins come in one package? The Sierra 18-1705 is sold as a single hinge pin.

What is the UPC for the Sierra 18-1705 hinge pin? The UPC for this hinge pin is 808282186609.

Can the 18-1705 hinge pin be used on gimbal bearing applications? No, the 18-1705 is specifically a gimbal housing hinge pin, not a gimbal bearing; confirm your drive's serial number and model against the Alpha Gen II and Bravo fitment before ordering.