Band Servo Piston Assembly
Band Servo Piston AssemblyAT-308 Components:
DISASSEMBLY
1. Push in OD servo piston assembly using a puller A (commercial service tool) and a suitable drift B, and then remove snap ring (1) from transaxle case using a flat-bladed screwdriver C.
2. Apply compressed air into the oil hole as shown in the figure to remove OD servo piston assembly and band servo piston assembly.
CAUTION: Do not blow air in too quickly, or OD servo piston assembly, band servo piston assembly and ATF could jump out. Carefully blow air little by little while protecting with lint-free cloth A.
3. Remove 2nd servo return spring from transaxle case.
4. Wrap OD servo piston retainer (1) using lint-free cloth A, and then apply compressed air into the band servo piston stem hole on OD servo piston (2) to remove OD servo piston (2) from OD servo piston retainer (1).
CAUTION: Do not blow air in too quickly, or OD servo piston (2) and ATF could jump out. Carefully blow air little by little while protecting with lint-free cloth A.
5. Remove D-ring (1) from OD servo piston (2).
6. Remove O-rings and from OD servo piston retainer.
(1): O-ring (small diameter)
(2): O-ring (medium diameter)
(3): O-ring (large diameter)
(4): OD servo piston retainer
7. Remove band servo piston assembly (1) from servo piston retainer (2).
8. Place band servo piston stem on a wooden block, and remove E-ring from band servo piston stem using a flat-bladed screwdriver while pressing spring retainer downward.
9. Remove spring retainer (1), OD servo return spring (2), band servo piston (3) and band servo thrust washer (4) from band servo piston stem (5).
10. Remove O-ring (1) from servo piston retainer (2).
11. Remove D-rings from band servo piston.
INSPECTION
Pistons, Retainers and Piston Stem
Check the sliding surfaces for damage or excessive wear. Replace if necessary.
Return Springs
^ Check each return spring for damage or deformation. Also measure free length. Refer to AT-345, "Band Servo". Band Servo
^ Replace springs if deformed or fatigued.
ASSEMBLY
1. Install D-rings to band servo piston.
2. Install band servo thrust washer (4), band servo piston (3), OD servo return spring (2) and spring retainer (1) to band servo piston stem (5).
3. Place band servo piston stem (1) on a wooden block, and install E-ring (2) to band servo piston stem (1) while pressing spring retainer (3) downward.
4. Install O-ring (1) to servo piston retainer (2).
5. Install band servo piston assembly (1) to servo piston retainer (2) by pushing it inward.
6. Install D-ring (1) to OD servo piston (2).
7. Install O-rings and to OD servo piston retainer.
(1): O-ring (small diameter)
(2): O-ring (medium diameter)
(3): O-ring (large diameter)
(4): OD servo piston retainer
8. Install OD servo piston (1) to OD servo piston retainer (2) fitting the figure direction on it.
9. Install 2nd servo return spring (2) and band servo piston assembly (3) to transaxle case (1).
10. Install OD servo piston assembly (2) to transaxle case (1).
11. Push in OD servo piston assembly using a puller A (commercial service tool) and a suitable drift B, and install snap ring (1) to transaxle case using a flat-bladed screwdriver C.