Band Apply Servo: Description and Operation

- When hydraulic pressure is applied between the 2-4 band servo retainer and the servo band piston, the servo band piston overcomes the spring force and causes the 2-4 band to lock the rear sun gear and drum.
- When hydraulic pressure is applied between the servo band and the transaxle case, the servo band piston is pressed toward the servo retainer side. This allows the 2-4 band to expand by its own spring force and release the rear sun gear and drum.
- When hydraulic pressure is applied simultaneously between the servo band piston and 2-4 band piston retainer and the servo band piston and the transaxle case, the servo band piston is pressed toward the servo retainer side due to the difference in surface area. The rear sun gear and drum is released and rotates freely.