The Piston Pump Measuring Tool Test Ring maintains a fixed relationship between the internal pump components. The ring allows barrel lift-off conditions to be measured without movement influencing the results. This controlled alignment supports the determination of lift-off shim thickness by keeping the barrel position stable throughout the measurement process. The tool allows repeated measurement steps to be completed with the same alignment condition, supporting comparison of readings before and after shim selection.Attributes:• Maintains alignment between barrel and slipper retaining plate.• Enables comparison of readings across inspection steps.• Supports evaluation of internal pump operating behavior.Applications: The Piston Pump Measuring Tool Test Ring is used during piston pump service procedures to hold alignment between the port plate, barrel, and slipper retaining plate while measuring pump barrel lift-off shim thickness.