3-4 Clutch

3-4 clutch
Pre-inspection
Clutch operation





1. Install SST (OK201 190 016) as shown, and check clutch operation by applying compressed air.
Air pressure: 57 psi (392 kPa, 4.0 kg/cm2) maximum

Clutch clearance
1. Measure clearance between snap ring and retaining plate of 3-4 clutch.





2. If clearance is not within specification, replace parts as necessary.
3-4 clutch clearance: 0.051 - 0.063 inch (1.3 - 1.6 mm)

Disassembly





1. Remove two thrust bearings.





2. Install SST (OK201 190 AA1) to 3-4 clutch as shown.
3. Compress spring and retainer assembly.
4. Remove snap ring.
5. Remove SST (OK201 190 AA1), then remove spring and retainer.
6. Remove snap ring.
7. Remove retaining plate.
8. Remove drive and driven plates (three of each)
9. Install SST (OK201 190 016) onto 3-4 clutch drum and remove 3-4 clutch piston using compressed air.
Air pressure: 57 psi (392 kPa, 4.0 kg/cm2) maximum
10. Remove SST (OK201 190016).





11. Remove outer seal and inner seal from 3-4 clutch piston.

Inspection
Drive plate
1. Measure facing thickness in three places, and determine average of three readings.
Standard: 0.063 inch (1.6 mm)
Minimum: 0.055 inch (1.4 mm)








2. If not within specification, replace drive plate(s).





Return spring
1. Measure spring free length.
2. If not within specification, replace spring.

3-4 clutch piston
1. Verify that there is not air leakage when applying compressed air through oil hole opposite return spring.





2. Verify that there is air flow when applying compressed air through oil hole on return spring side.
Air pressure: 57 psi (392 kPa, 4.0 kg/cm2) maximum

Re-assembly
1. Install 3-4 clutch piston.
a. Apply ATF to inner and outer seals, and install them onto 3-4 clutch piston.





b. Install piston by pushing evenly around circumference, being careful not to damage seal rings.





2. Install return spring and spring retainer.
3. Install SST (OK 201 190 AA1) to 3-4 clutch as shown.
4. Compress return spring and spring retainer.
5. Install snap ring.





6. Remove SST (OK201 190 AA1).
7. Install drive and driven plates (three of each).

Notice: Installation order:
Driven-Drive-Driven-Drive-Driven-Drive

8. Install retaining plate.





9. Install snap ring.
10. Measure 3-4 clutch clearance.
a. Measure clearance between snap ring and retaining plate of 3 - clutch.





b. If clearance is not within specification, adjust it by selecting snap ring with correct thickness.
3-4 clutch clearance: 0.051 - 0.063 inch (1.3 - 1.6 mm)





11. Check clutch operation as follows:





a. Install SST (OK201 190 016) as shown, and check clutch operation by applying compressed air.
Air pressure: 57 psi (392 kPa, 4.0 kg/cm2) maximum





12. Apply petroleum jelly to thrust bearings and secure them to each side of 3-4 clutch drum.
Thrust bearing outer diameter:
Planetary carrier side: 2.21 inch (56.1 mm)
Output shell side: 2.84 inch (2.1 mm)