Band Apply Servo: Service and Repair

DISASSEMBLY
1. Remove band servo piston fixing bolts.





2. Apply compressed air to oil hole in transmission case to remove O/D servo piston retainer and band servo piston assembly. Hold band servo piston assembly with a waste.





3. Apply compressed air to oil hole in O/D servo piston retainer to remove O/D servo piston from retainer. Hold O/D band servo piston while applying compressed air, rag or nylon.





4. Remove D-ring from O/D servo piston.





5. Remove O-rings from O/D servo piston retainer.





6. Remove band servo piston assembly from servo piston retainer by pushing it forward.





7. Place piston stem end on a wooden block. While pushing servo piston spring retainer down, remove O-ring.





8. Remove O/D servo return spring, band servo thrust washer and band servo piston stem from band servo piston.





9. Remove O-rings from servo piston retainer.





10. Remove O-rings from band servo piston.

INSPECTION

Pistons, Retainers And Piston Stem
^ Check frictional surfaces for abnormal wear or damage.





Return Springs
^ Check for deformation or damage.
^ Measure free length and outer diameter.
2nd Servo Return Spring:
Free Length: 32.5 mm (1.280 inch)
Outer Diameter: 25.9 mm (1.020 inch)
O/D Servo Return Spring:
Free Length: 31.0 mm (1.220 inch)
Outer Diameter: 21.7 mm (0.854 inch)





ASSEMBLY
1. Install O-rings to servo piston retainer. Apply ATF to O-rings. Pay attention to position of each O-ring.





2. Install band servo piston stem, band servo thrust washer, O/D servo return spring and spring retainer to band servo piston.





3. Place piston stem end on a wooden block. While pushing servo piston spring retainer down, install E-ring.





4. Install O-rings to servo piston retainer. Apply ATF to O-rings. Pay attention to position of each O-ring.





5. Install band servo piston assembly to servo piston retainer by pushing it inward.





6. Install D-ring to O/D servo piston. ATF to D-ring.





7. Install O-rings to O/D servo piston retainer. Apply ATF to O-rings. Pay attention to position of each O-ring.





8. Install O/D servo piston to O/D servo piston retainer.





9. Install band servo piston assembly and 2nd servo return spring to transmission case. Apply ATF to O-ring of band servo piston and transmission case.





10. Install O/D servo piston assembly to transmission case. Apply ATF to O-ring of band servo piston and transmission case.





11. Install band servo piston snap ring to transmission case.