Center Support Disassembly and Assembly
Center Support Disassembly and AssemblyDisassembly
1) Remove retaining ring.
Special Tool
(A): 09920-76010
2) Pull out center support assembly (2) from planetary sun gear (1).
3) Apply compressed air (400 - 800 kPa, 4 - 8 kgf/cm2, 57 - 113 psi) to oil hole (1) at the extreme left and measure movement of second coast brake (Second coast brake) piston.
If measured value is not within standard range, replace second coast brake plate or second coast brake disc.
Standard second coast brake piston movement
0.75 - 1.35 mm (0.030 - 0.053 in.)
4) Remove retaining ring.
5) After removing clutch backing plate (1), remove second coast brake plate (3) and second coast brake disc (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) Apply compressed air (400 - 800 kPa, 4 - 8 kgf/cm2, 57 - 113 psi) to oil hole at the extreme left and remove second coast brake piston as shown in figure. Then remove piston inner O-ring and piston outer O-ring from second coast brake piston.
9) Remove 3 seal rear rings (1).
10) Apply compressed air (400 - 800 kPa, 4 - 8 kgf/cm2, 57 - 113 psi) to second hole (1) from the left and measure stroke of second brake (Second brake) piston as shown in figure.
If measured value is not within standard range, replace second brake plate or second brake disc.
Standard second brake piston stroke
0.97 - 1.70 mm (0.038 - 0.067 in.)
11) After removing retaining back plate ring, remove clutch backing plate, second brake plates and second brake discs.
12) Using special tool and hydraulic press, compress brake piston return spring and remove snap second coast brake ring.
CAUTION:
Be careful when applying pressure, for overpressure will cause plate section of piston return spring to deform.
Special Tool
(A): 09926-98310
13) Remove brake piston return spring.
14) Blow air into the second air hole from the right and remove second brake piston. Then remove piston inner O-ring and piston outer O-ring from second brake piston.
15) With second 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 second brake hub assembly (1) from planetary sun gear (2).
17) Remove 2 sun gear seal rings (1) from planetary sun gear.
Assembly
Assemble components by reversing disassembly procedure and noting the following points.
^ Install new seal ring (1) to sun gear 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 new 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:4 A/T.
^ Install clutch backing plate (1) with its flat 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 second coast brake piston and second brake piston
Second coast brake piston: 1.00 - 1.20 mm (0.039 - 0.047 in.)
Second brake piston: 1.01 - 2.25 mm (0.040 - 0.089 in.)