Sierra Gimbal Bearing 18-21006, Replaces 30-879194A01, Fits Bravo I/II/III/X/XR/XZ (1996-2010) & Gen II (1998-2010)

This Sierra gimbal bearing (18-21006) supports the engine coupler where it passes through the gimbal ring, allowing the drive unit to pivot for steering and trim while carrying the load of the engine coupler shaft. It is built with an alloy steel ball bearing design and finished in white. The bearing is a non-greasable design, so there is no grease fitting to service on a routine maintenance schedule. It functions as a direct replacement for OEM part 30-879194A01 and is sized to fit the same coupler bore used across the applicable Bravo and Gen II sterndrive lines.

Sierra 18-21006 fits Bravo I, II, III, X, XR, and XZ sterndrives built 1996-2010, and Gen II sterndrives built 1998-2010. Within the Bravo XZ line, it is confirmed for units with serial number F730000 and up. Because gimbal bearing wear directly affects coupler alignment and can accelerate U-joint and bellows wear if left unaddressed, replacing a worn or pitted bearing with a properly sized unit like this one helps keep the drive shaft running true.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-21006
• Product: Gimbal Bearing
• Color: White
• Material: Alloy Steel
• Bearing Type: Ball Bearing
• Lubrication: Non Greasable
• Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 1.17 pounds
• UPC: 808282294175
• GTIN: 00808282294175
• Specification Met: ISO 9001

Fitment

• Bravo I, II, III, X, XR, and XZ sterndrives, 1996-2010
• Bravo XZ sterndrives, serial number F730000 and up
• Gen II sterndrives, 1998-2010

Replaces (OEM)

• 30-879194A01

Frequently Asked Questions

What does gimbal bearing 18-21006 fit? Sierra 18-21006 fits Bravo I, II, III, X, XR, and XZ sterndrives built 1996-2010, and Gen II sterndrives built 1998-2010. On Bravo XZ units it is confirmed for serial number F730000 and up.

Is 18-21006 the same as OEM part 30-879194A01? Yes, Sierra 18-21006 is a direct replacement for OEM part 30-879194A01 and is sized to the same coupler bore.

Does this gimbal bearing need to be greased? No. The 18-21006 gimbal bearing is a non-greasable design, so there is no grease fitting to service.

What material is the 18-21006 gimbal bearing made from? It is machined from alloy steel in a ball-bearing design, finished in white.

How much does the Sierra 18-21006 gimbal bearing weigh? The 18-21006 gimbal bearing weighs 1.17 pounds.

What are the dimensions of gimbal bearing 18-21006? It measures 0.39 x 0.39 x 0.39 inches.

Will 18-21006 fit a Bravo I sterndrive? Yes, Sierra 18-21006 is listed as fitting Bravo I sterndrives built 1996-2010, along with Bravo II, III, X, XR, and XZ of the same years.

Does 18-21006 fit Gen II sterndrives? Yes, this gimbal bearing fits Gen II sterndrives built 1998-2010.

What is included with the 18-21006 gimbal bearing? The package includes one Sierra 18-21006 gimbal bearing, sold as a single unit.

Is the Sierra 18-21006 gimbal bearing genuine Sierra or aftermarket? The 18-21006 is a genuine Sierra-branded part manufactured to ISO 9001 specification met standards.

What serial number range is confirmed for Bravo XZ fitment on 18-21006? For Bravo XZ sterndrives, Sierra 18-21006 is confirmed for serial number F730000 and up.