Band - 2-4, Servo

When hydraulic pressure is applied between the servo retainer and the servo piston (2-4 band engagement side), the servo piston overcomes the spring force and acts on the 2-4 band, locking the 2-4 band drum and small sun gear. When hydraulic pressure is applied between the servo piston and transmission case (2-4 band disengagement side), the servo piston is pressed toward the servo retainer side. The 2-4 band expands by its own spring force, releasing the 2-4 band drum and small sun gear.

When hydraulic pressure is applied simultaneously between the servo retainer and the servo piston and between the servo piston and transmission case, the servo piston is pressed to the servo retainer side as a result of the difference of the surface area between the two, releasing the 2-4 band drum and small sun gear. The 2-4 band operates during second gear and fourth gear.