A Backup Ring in a track adjuster cylinder piston provides additional sealing support to the primary piston seal inside the track adjuster piston. It is made from plastic material with a split or segmented design and placed between the sealing element and positioned in a groove or recess on the piston, behind the primary piston seal.

Attributes:
• Helps to reduce the friction between the mating parts
• Provides structural support, preventing the primary seal from being forced into any gaps or clearances

Applications:
A Backup Ring helps maintain the hydraulic seal integrity and acts as a secondary barrier to prevent hydraulic fluid from escaping past the track adjuster piston and into the surrounding environment.