Forward and Overrun Clutches

Forward and Overrun Clutches

Forward and Overrun Clutches:

DISASSEMBLY
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










INSPECTION
Inspection of forward clutch and overrun clutch return springs





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)







ASSEMBLY







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
VG33E only:.....................2.0 mm (0.079 inch)
VG33ER only:.......................2.4 mm (0.094 inch)






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 43X64 (2WD).................1.95 mm (0.077 inch)
VG33E only: Model 4EX01 (4WD).................2.15 mm (0.085 inch)
VG33ER only: Model 4EX67 (2WD)...................2.15 mm (0.085 inch)
VG33ER only: Model 4EX68 (4WD).....................2.35 mm (0.093 inch)