Forward and Overrun Clutches

Forward and Overrun Clutches

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 Standard:

^ 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)
Wear limit: 1.4 mm (0.055 in)

^ Inspection of overrun clutch drive plates
- Thickness of drive plate:
Standard: 2.0 mm (0.079 in)
Wear limit: 1.8 mm (0.071 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 Mechanical Specifications




^ Measurement of clearance between retaining plate and snap ring of forward clutch
- Specified clearance:
Standard: 0.45-0.85 mm (0.0171-0.0335 in)
Allowable limit: 2.25 mm (0.0886 in)
Retaining plate:
Refer to specifications Mechanical Specifications