Forward and Overrun Clutch

COMPONENTS

Service procedures for forward and overrun clutches are essentially the same as those for reverse clutch, with the following exception:




- Check of forward clutch operation




- Check of overrun clutch operation




- Removal of forward clutch drum
Remove forward clutch drum from transmission case by holding snap ring.

- Removal of forward clutch and overrun clutch pistons




1. While holding overrun clutch piston, gradually apply compressed air to oil hole.




2. Remove overrun clutch from forward clutch.




- Removal and installation of return springs




- Inspection of forward clutch and overrun clutch return springs





- Inspection of forward clutch drive plates

Thickness of drive plate:
Standard
1.6 mm (0.063 in) (RE4R01A)
2.0 mm (0.079 in) (RE4R03A)

Wear limit
1.4 mm (0.055 in) (RE4R01A)
1.8 mm (0.071 in) (RE4R03A)




- Inspection of overrun clutch drive plates

Thickness of drive plate:
Standard
2.0 mm (0.079 in) (RE4R01A)
1.6 mm (0.063 in) (RE4R03A)

Wear limit
1.8 mm (0.071 in) (RE4R01A)
1.4 mm (0.055 in) (RE4R03A)










- Installation of forward clutch piston and overrun clutch piston
1. Install forward clutch piston by turning it slowly and evenly.
- Apply ATF to inner surface of clutch drum.
- Align notch in forward clutch piston with groove in forward clutch drum.
2. Install overrun clutch by turning it slowly and evenly.
- Apply ATF to inner surface of forward clutch piston.




- Measurement of clearance between retaining plate and snap ring of overrun clutch

Specified clearance:
Standard 1.0 - 1.4 mm (0.039 - 0.055 in)

Allowable limit
2.0 mm (0.079 in) (RE4R01A)
2.2 mm (0.087 in) (RE4R03A)

Retaining plate: Refer to SDS.




- Measurement of clearance between retaining plate and snap ring of forward clutch

Specified clearance:
Standard 0.45 - 0.85 mm (0.0177 - 0.0335 in)

Allowable limit
2.25 mm (0.0886 in) (RE4R01A)
2.45 mm (0.0965 in) (RE4R03A)

Retaining plate: Refer to SDS.