Damage to bottom of base rail caused by misalignment or malfunction of rollers, resulting in wear or indentation of base rail material, is known as what?

• A. Leak
• B. Twist
• C. Shuttle Valve
• D. Ironing

Answer: (D)

Ironing is the wear pattern that occurs when roller misalignment or a malfunctioning roller presses against the underside of the base rail as the carriage moves. This contact shoes into the rail material, creating wear or an indentation along the bottom surface. It’s a specific indication of improper roller alignment or worn rollers, and it signals the need to inspect and correct the roller setup and the base rail surface. Leaks involve fluid loss, twists are structural distortions, and a shuttle valve is a hydraulic component—none of these describe the indentation pattern caused by roller contact on the base rail.