No line pressure is applied to the primary pulley because the line pressure circuit is closed by the ratio control valve.
The line pressure is applied to the secondary pulley because the secondary valve has moved downwards.
The pulley ratio linkage moves to the left by the stepper motor. This moves the ratio control valve linked to the pulley ratio linkage to open the line pressure circuit, and then the line pressure is applied to the primary pulley.
The secondary valve moves upwards to drain the fluid in the secondary pulley.
The line pressure applied to the primary pulley moves the movable pulley to the right, pressing the steel belt outwards to expand.
When the movable pulley of the primary pulley moves to the right, the ratio control valve starts moving to the right via the pulley ratio linkage linked to the movable pulley.
The steel belt is pulled toward the primary pulley side to move the movable pulley of the secondary pulley to the right.
When the movable pulley of the secondary pulley moves to the right, the ratio control valve also moves to the right to close the line pressure circuit. This completes the shift change process.
The secondary valve moves downwards to apply the line pressure to the secondary pulley, clamping the steel belt.
SHIFTING FROM HIGH TO LOW
The pulley ratio linkage moves to the right by the stepper motor. This moves the ratio control valve linked to the pulley ratio linkage to drain the fluid in the primary pulley.
The line pressure is applied to the secondary pulley because the secondary valve has moved downwards.
The line pressure applied to the secondary pulley moves the movable pulley to the left, pressing the steel belt outwards to expand.
The steel belt is pulled toward the secondary pulley side to move the movable pulley of the primary pulley to the left.
When the movable pulley of the primary pulley moves to the left, the ratio control valve starts moving to the left via the pulley ratio linkage linked to the movable pulley.
When the movable pulley of the secondary pulley moves to the left to press the steel belt outwards to expand, the movable pulley of the primary pulley moves further to the left accordingly.
When the movable pulley of the primary pulley moves to the left, the ratio control valve also moves to the left to close the drain circuit. This completes the shift change process.
