Overdrive (Planetary Gear Side)

Disassembly

1. With overdrive (O/D) clutch cylinder (1) held stationary, turn O/D input shaft (2) clockwise to check that it turns smoothly and then counterclockwise to check that it locks.

2. Remove O/D planetary gear assembly (1).

3. With O/D clutch assembly (2) installed to oil pump, apply 4 to 8 kgf/cm2 air pressure into fluid hole in oil pump (1) and measure stroke of clutch piston. If it is not within standard range, replace cushion clutch plate or clutch disc.
Standard stroke of clutch piston 1.47 - 2.28 mm (0.058 - 0.090 inch)

4. Remove retaining ring (1) and then remove brake hub (2).

5. Remove retaining clutch ring (1) cushion plate, backing plate and clutch disc in that order.

6. With clutch piston return spring compressed with special tools, remove clutch piston return spring.
Special tool
(A): 09918-48211
(B): 09926-98320
(C): 09918-48220
7. Install O/D clutch cylinder to oil pump (2). Apply compression air into fluid hole in oil pump (2) and remove clutch

8. Remove piston inner O-ring and piston outer O-ring from clutch piston (1).

9. Remove retaining ring from O/D planetary gear and then remove one-way clutch, thrust planetary washer and thrust bearing.

Reassembly
Assemble each component by reversing removal procedure and noting the following points.
^ When installing thrust washer (1), bring its oil groove (3) to the front.

^ When installing one-way clutch to one-way clutch outer race, bring its flange (2) to the front.
^ Before installing piston inner O-ring and piston outer O-ring, apply A/T fluid to them.

^ Install so that snap opening and projection (1) of clutch piston return spring will not match.

^ Install retaining clutch ring and retaining brake hub so that their slots (2) will not match with dent (1) in O/D clutch cylinder.

^ For installing cushion clutch plate (1), refer to the figure.

Inspection
^ Check that ball valve of clutch piston is not stuck.

^ Check valve for leakage by applying low pressure air into ball valve hale.