Low One-Way, Forward, and Overrunning Clutch

SST:

Preperation

Pre-Inspection




Low one-way clutch operation
1. Install the forward clutch drum into the transmission case.
2. Verify that the forward clutch drum rotates smoothly when turned clockwise, and locks when turned counterclockwise.
3. If not, replace the one-way clutch.




Forward clutch and overrunning clutch operation
1. Install the forward clutch drum and low one-way clutch inner race into the transmission case. Apply compressed air through the oil passage as shown.
2. Verify that the retaining plates move toward the snap rings.

Air pressure: 390 kPa (4.0 kgf/sq.cm, 57 psi) max.

3. If not, the D-rings or the seal ring may be damaged or fluid may be leaking at the piston check ball. Inspect and replace as necessary when assembling.




Clearance between retaining plate and snap ring
1. Measure the clearance between the retaining plate and the snap ring of the forward clutch and the overrunning clutch.

Clearance
Forward clutch: 0.45 - 1.85 mm (0.018 - 0.073 in)
Overrunning clutch: 1.0 - 2.0 mm (0.039 - 0.079 in)

2. Select the correct retaining plate when assembling. (Refer to pages K-185,186.)ZZZZ







Disassembly / Inspection / Assembly
1. Disassemble in the order shown in the figure, referring to Disassembly Note.
2. Inspect all parts and replace as necessary.
3. Assemble in the reverse order of disassembly, referring to Assembly Procedure.

Disassembly note

Snap ring




1. Assemble the SST.






CAUTION:
- Depress the spring retainer only enough to remove the snap ring.
- Do not damage the snap ring.

2. Compress the springs by using the SST, and remove the snap ring with snap ring pliers.
3. Remove the spring retainer and return springs.




Forward clutch piston, Overrunning clutch piston
1. Set the forward clutch drum in the transmission case.
2. Remove the piston by applying compressed air through the oil passage.

Air pressure: 390 kPa (4.0 kgf/sq.cm, 57 psi) max.

3. Remove the overrunning clutch piston from the forward clutch piston.

Inspection




Drive plates
1. Measure the facing thickness in three places, and calculate the average.

Forward clutch
Standard: 2.0 mm (0.079 in)
Minimum: 1.8 mm (0.071 in)

Overrunning clutch
Standard: 2.0 mm (0.079 in)
Minimum: 1.8 mm (0.071 in)

2. If not within specification, replace the drive plate.

Return springs




1. Measure the spring free length.

Specification:

Specification

2. If not within specification, replace the return spring.




Overrunning clutch piston
1. Shake the clutch piston and verify that the check ball is
2. Verify that there is no air flow when applying compressed air through the oil hole on the clutch drum side.
3. Verify that there is air flow when applying compressed air through the oil hole on return spring side.

Air pressure: 390 kPa (4.0 kgf/sq.cm, 57 psi) max.




Forward clutch drum
1. Verify that there is no air flow when applying compressed air through the oil hole on the front side.
2. Verify that there is air flow when applying compressed air through the oil hole on the rear side.

Air pressure: 390 kPa (4.0 kgf/sq.cm, 57 psi) max.

Assembly procedure




1. Apply ATF to the bearing and Install it into the forward clutch drum.

CAUTION: Do not deform the snap ring.

2. Install the snap ring.






CAUTION:
- Install the low one-way clutch with the flange facing upward.
- Do not damage the forward clutch drum inner face when Installing the low one-way clutch.

3. Apply ATF to the low one-way clutch, and Install it into the forward clutch drum.






CAUTION: Do not deform the snap ring.

4. Apply ATF to the side plate and snap ring, and Install them into the forward clutch drum.




5. Apply ATF to a new D-ring and seal ring, and Install them into the forward clutch piston as shown.




6. Apply ATF to the new D-rings, and Install them to the overrunning clutch piston as shown.






CAUTION:
- Apply even pressure to the perimeter of the piston when Installing it to avoid damaging the seal ring and D-ring.
- If the piston cannot be turned by hand, remove the piston and check for damage to the seal ring.

7. Apply ATF to the inner face of the forward clutch drum and to the forward clutch piston.
8. Install the forward clutch piston in the forward clutch drum by turning it evenly and gradually. Align the notches in the forward clutch piston with the grooves in forward clutch drum.






CAUTION: Apply even pressure to the perimeter of the piston when Installing it to avoid damaging the D-rings.

9. Apply ATF to the inner face of the forward clutch piston and to the overrunning clutch piston.
10. Install the overrunning clutch piston in the forward clutch piston by turning it evenly and gradually.




11. Install the return springs and spring retainer.






CAUTION:
- Depress the spring retainer only enough to Install the snap ring.
- Do not overexpand the snap ring.
- Install the snap ring inside the stopper of the spring retainer.
- Do not align the snap ring endgap with the spring retainer stopper.




12. Install the snap ring while compressing the springs by using the SST.




13. Install the dished plate as shown.

NOTE:
- Installation order: Driven-Drive-Driven-Driven-Drive-Driven-Driven-Drive
- Soak new drive plates in ATF for at least two hours before Installation.

14. Apply ATF to the drive plates and driven plates, and Install them into the forward clutch piston.




15. Install the retaining plate.

CAUTION: Do not deform the snap ring.

16. Install the snap ring.




17. Measure the clearance between the retaining plate and the snap ring by using a feeler gauge

Clearance: 1.0 - 2.0 mm (0.039 - 0.079 in)

18. If not within specification, adjust the clearance by selecting the correct retaining plate.

Reatining Plate Size:

Retaining plate size




19. If the clearance cannot be brought to within specification after installation of the thickest retaining plate, replace the dished plate, driven plates, and drive plates.

Adjust the clearance by selecting the correct retaining plate.

Clearance: 1.0 - 1.4 mm (0.039 - 0.055 in)




20. Install the dished plate as shown.

NOTE:
- Installation order: Driven-Drive-Driven-Drive-Driven-Drive-Driven-Drive-Driven-Drive
- Soak new drive plates in ATF for at least two hours before installation.

21. Apply ATF to the drive plates and driven plates, and install them into the forward clutch drum.




22. Install the retaining plate.

CAUTION: Do not deform the snap ring.

23. Install the snap ring.




24. Measure the clearance between the retaining plate and the snap ring by using a feeler gauge. If not within specification, adjust the clearance by selecting the correct retaining plate.

Clearance: 0.45 - 1.85 mm (0.018 - 0.073 in)

Reatining Plate Size:

Retaining plate size




25. If the clearance cannot be brought to within specification after Installation of the thickest retaining plate, replace the dished plate, driven plates, and drive plates.

Adjust the clearance by selecting the correct retaining plate.

Clearance: 0.45 - 0.85 mm (0.018 - 0.033 in)






CAUTION: Do not deform the snap ring.

26. Install the snap ring.

Illustration Of Proper Assembly:

CAUTION: Apply air for no more than 3 seconds.




27. Set the forward clutch drum in the transmission.
28. Apply compressed air through the oil passage as shown, and verify the forward clutch operation.

Air pressure: 390 kPa (4.0 kgf/sq.cm, 57 psi) max.






NOTE: Use a paper wipe to block the oil passage.

29. Apply compressed air through the oil passage as shown, and check the overrunning clutch operation.

Air pressure: 390 kPa (4.0 kgf/sq.cm, 57 psi) max.




30. Verify that the forward clutch drum turns clockwise only.

NOTE: If it turns counterclockwise, the one-way clutch is Installed upside down.