Forward and Overrun Clutches
FORWARD AND OVERRUN CLUTCHES
Components
Disassembly and Assembly
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
- While holding overrun clutch piston, gradually apply compressed air to oil hole.
- Remove overrun clutch from forward clutch.
^ Removal and installation of 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: 1.52 -1.67 mm (0.0598 - 0.0657 inch)
Wear limit: 1.40 mm (0.0551 inch)
^ Inspection of overrun clutch drive plates
Thickness of drive plate
Standard: 1.90 - 2.05 mm (0.0748 - 0.0807 inch)
Wear limit: 1.80 mm (0.0709 inch)
^ Installation of forward clutch piston and overrun clutch piston
- 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.
- 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: 2.4 mm (0.094 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
VG33E only
Model 4FX00 (2WD): 2.15 mm (0.085 inch)
Model 4FX01 (4WD): 2.15 mm (0.085 inch)
VG33ER only
Model 4FX02 (2WD): 2.15 mm (0.085 inch)
Model 4FX03 (4WD): 2.35 mm (0.093 inch)
Retaining plate: Refer to Specifications.