• In N position, line pressure (7) is constantly applied to the right side of the piston, pushing it to the left side.
• When D range is selected from N position, line pressure (1), which engages the forward clutch, is applied to the piston by the manual valve.
• As a result, the combination of line pressure (1) and spring force overcomes line pressure (7), moving the piston gradually to the right side. This movement of the piston moderates a rapid increase in line pressure (1).
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