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Center Support Assembly: Disassembly

  1. Remove snap ring from end of sun gear shaft. Remove planetary sun gear with No. 1 one-way clutch from center support. Repeat procedure used in direct clutch disassembly to check No. 1 brake piston stroke. Piston stroke should be .025-.068" (.63-1.73 mm). If piston stroke is not as specified, inspect discs. See Fig 1.
  2. Remove snap ring from front of center support. Remove flange, disc(s) and plate(s). See Fig 2. Using appropriate spring compressor, compress piston return spring. Remove snap ring. Remove piston return spring.
  3. Hold No. 1 brake piston and apply air pressure to center support oil hole to remove No. 1 brake piston. See Fig 1. Remove "O" rings and oil seal rings. Turn center support over.
  4. Check No. 2 brake piston stroke. Repeat test procedure used previously for checking piston stroke on No. 1 brake piston. See Fig 3. Piston stroke should be .0398-.0886" (1.01-2.25 mm). If piston stroke is not as specified, inspect discs. Remove rear snap ring, flange, discs and plates. Note location and number of components. See Fig 4.
  5. Using appropriate spring compressor and press, compress piston return spring. Remove snap ring. Remove piston return spring. Hold No. 2 brake piston and apply air pressure to center support oil hole to remove No. 2 brake piston. See Fig 3. Remove "O" rings.
  6. Hold No. 1 one-way clutch and rotate planetary gear. Sun gear should rotate freely in counterclockwise direction and lock in clockwise direction. See Fig 5. If component does not test as described, one-way clutch requires replacement. Loosen staked part of rear side retainer. Remove No. 1 one-way clutch and 2 retainers from outer race. See Figure. Using a pin punch and hammer, remove front side retainer. Remove oil seal rings from sun gear.
  7. Remove thrust washer from front planetary gear. Hold one-way clutch inner race and rotate planetary gear. Planetary gear should rotate freely in counterclockwise direction and lock in clockwise direction. See Figure. Remove one-way clutch inner race. Remove snap ring, one-way clutch and 2 retainers. See Figure.
Fig 1: Measuring No. 1 Brake Piston Stroke
G93J23837Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig 2: Exploded View Of No. 1 Brake Components
G93A23838Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig 3: Measuring No. 2 Brake Piston Stroke
G93B23839Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig 4: Exploded View Of No. 2 Brake Components
G93E23840Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig 5: Checking No. 1 One-Way Clutch Operation
G95H20161Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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