Center Support

Disassembly





1. Remove retaining ring.
Special tool
(A): 09920-76010





2. Pull out center support assembly (2) from planetary sun gear (1).





3. Apply 4 - 8 kgf/cm2 air pressure into fluid hole at the extreme left and measure movement of B1 brake (Second coast brake) piston.
If measured value is not within standard range, replace B1 brake plate or B1 brake disc.
Standard B1 brake piston movement 1.00 - 1.20 mm (0.039 - 0.047 inch)





4. Remove retaining ring.





5. After removing clutch backing plate (1), remove B1 brake plates (3) and B1 brake discs (2).





6. Using special tool and hydraulic press, compress piston return spring and remove snap ring.

CAUTION: Be careful when applying pressure, for overpressure will cause plate section of piston return spring to deform.

Special tool
(A): 09926-98310





7. Remove brake piston return spring (1).





8. Blow air into fluid hole at the extreme left and remove B1 brake piston as shown in the figure. Then remove piston inner O-ring and piston outer O-ring from B1 brake piston.





9. Remove 3 seal rear rings (1).

NOTE: Use care not to open ring more than necessary.





10. Apply 4 - 8 kgf/cm2 air pressure into the second hole from the left and measure stroke of B2 brake (Second brake) piston as shown in the figure.
If measured value is not within standard range, replace B2 brake plate or B2 brake disc.
Standard B2 brake piston stroke 1.01 - 2.25 mm (0.040 - 0.089 inch)





11. After removing retaining back plate ring, remove clutch backing plate, B2 brake plates and B2 brake discs.





12. Using special tool and hydraulic press, compress brake piston return spring and remove snap B1 brake ring.

CAUTION: Be careful when applying pressure, for overpressure will cause plate section of piston return spring to deform.

Special tool
(A): 0992698310





13. Remove brake piston return spring.





14. Blow air into the second air hole from the left and remove B2 brake piston. Then remove piston inner O-ring and piston outer O-ring from B2 brake piston.





15. With B2 brake hub assembly (3) held stationary, turn planetary sun gear (4) clockwise to check that it locks and then counterclockwise to check that it turns smoothly.





16. Remove B2 brake hub assembly (1) from planetary sun gear (2).





17. Remove 2 sun gear seal rings (1) from planetary sun gear.

NOTE: Use care not to open sun gear seal ring more than necessary.

Reassembly





Assemble components by reversing disassembly procedure and noting the following points.
^ Snap both ends of sun gear seal ring (1) securely.
^ Do not open sun gear seal ring more than necessary.
^ Always use new O-ring and apply A/T fluid before installation.
^ When installing O-ring, make sure that it is not kinked or caught.
^ Push in brake piston horizontally.
^ When installing brake piston return spring, be careful so that spring will not fall or tilt.





^ When installing snap ring, do not align lug (1) of retainer with opening in snap ring (2).
^ When installing brake discs, brake plates and clutch backing plate, refer to "Center Support Components:".





^ Install clutch backing plate with its chamfered side facing brake disc.
^ After installing each retaining backing plate ring, measure movement of brake piston again. If it is not within standard range, it is possible that ring is not installed properly. Then disassemble and reassemble again.
Standard movement of B1, B2 brake piston
B1: 1.00 - 1.20 mm (0.039 - 0.047 inch)
B2: 1.01 - 2.25 mm (0.040 - 0.089 inch)