Forward and Overrun Clutches

Forward And Overrun Clutches:

Forward and overrun clutches are serviced essentially the same way as reverse clutch is serviced. However, note the following exceptions.




- 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

Return Springs:

- Inspection of forward clutch and overrun clutch return springs




- Inspection of forward clutch drive plates

Thickness of drive plate:
Standard 2.0 mm (0.079 in)
Wear limit 1.8 mm (0.071 in)




- Inspection of overrun clutch drive plates

Thickness of drive plate:
Standard 2.0 mm (0.079 in)
Wear limit 1.8 mm (0.011 in)




- 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)
Retaining plate: Refer to Specifications.
Specifications




- 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 1.85 mm (0.0128 in)
Retaining plate: Refer to Specifications.
Specifications