Which component directs air to shift the splitter piston inside the splitter cylinder?

• A. Splitter cylinder
• B. Regulator assembly
• C. Control valve in gearshift knob
• D. Insert valve

Answer: (D)

The air that moves the splitter piston is directed by the insert valve. This valve sits in the valve body and routes compressed air to the correct side of the splitter cylinder, causing the piston to extend or retract and shift the splitter gear. It also vents the opposite side as needed to complete the motion. The regulator assembly only sets the pressure, not the direction of flow; the control valve in the gearshift knob selects the action, but the actual directing of air to the piston happens through the insert valve. The splitter cylinder is the actuator being moved, not the device that directs the air.