Forward and Overrun Clutches

DISASSEMBLY AND ASSEMBLY
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
Forward and overrun clutch snap rings and spring retainers
- Check for deformation, fatigue or damage.

Forward and overrun clutch return springs

- Inspection of forward clutch and overrun clutch return springs
Inspection standard: Refer to Specifications.

- Inspection of forward clutch drive plates
Thickness of drive plate:
Standard 1.90 - 2.05 mm (0.0748 - 0.0807 inch)
Wear limit 1.6 mm (0.063 inch)

- Inspection of overrun clutch drive plates
Thickness of drive plate:
Standard 1.52 - 1.67 mm (0.0598 - 0.0657 inch)
Wear limit 1.8 mm (0.071 inch)

INSTALLATION
- 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 inch)
Allowable limit 2.2 mm (0.087 inch)
Retaining plate: Refer to Specifications.

- Measurement of clearance between retaining plate and snap ring of forward clutch
Specified clearance:
Standard 0.35 - 0.75 mm (0.0138 - 0.0295 inch)
Allowable limit 1.95 mm (0.0768 inch)
Retaining plate: Refer to Specifications.