Advance FAA Knuckle Plug Rf21

Advance FAA Knuckle Plug Rf21

This knuckle plug is a direct replacement component for the steering knuckle assembly on Meritor RF-21 front drive steer axles, which are standard on Terex Advance and Oshkosh front discharge mixers. It installs into the upper and lower knuckle caps to seal the kingpin bore, protecting the internal kingpin bushings and bearings from water, dirt, and concrete debris. Replacing damaged or missing knuckle plugs is critical during routine axle maintenance to prevent premature wear of the steering components and ensure proper lubrication retention.

Key Features

• Designed specifically for Meritor RF-21 and MX-23 front drive steer axles
• Seals the kingpin bore to prevent ingress of moisture, dirt, and concrete debris
• Helps retain grease within the kingpin bushings for smooth steering operation
• Installs directly into the upper or lower steering knuckle caps

Fits These Mixers

Terex, Terex Advance, Oshkosh. Fits Terex Advance and Oshkosh front discharge concrete mixers equipped with Meritor RF-21 or MX-23 front drive steer axles. Used in the kingpin and steering knuckle assembly.

Product descriptions are drafted with automated tools and reviewed as time allows. While we work to keep them accurate, specifications and fitment should be confirmed with a Customer Service specialist at 800-745-3414 before purchase. Found an error? Let us know and we’ll fix it.