Isuzu Trooper (1998-2002 year). Manual - part 736

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–141

FORWARD CLUTCH ASSEMBLY (C-1)

DISASSEMBLY

248RY00063

Disassembly steps

▲

 1. Thrust bearing

2. Race

▲

 3. Snap ring

4. Flange

5. Disc and plate

▲

 6. Snap ring

7. Piston return spring

▲

 8. Piston

9. O-ring

10. O-ring

11. Oil seal ring

12. Thrust bearing

7A–142

AUTOMATIC TRANSMISSION (AW30-40LE)

248RY00039

248RY00048

248RY00040

248RY00041

Important operations

Remove forward clutch assembly from direct clutch
assembly.

1. Thrust bearing

Place wooden blocks, etc, to prevent forward clutch shaft
from touching the work stand, and place the OD support on
them.
Place the forward clutch onto the OD support and remove
the bearing and race.

Check piston stroke of forward clutch (C–1)

Using a dial indicator, measure the forward clutch piston
stroke by applying and releasing compressed air (4–8kg/
cm

2

, 57–114psi or 392–785kPa)as shown.

3. Snap ring

Remove snap ring from clutch drum.

mm (in.)

Pack clearance

0.6–1.0 (0.0236–0.0394)

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–143

248RY00003

248RY00042

248RY00031

248RY00043

6. Snap ring

Place special tool on the spring retainer and compress the
return spring. Using snap ring pliers, remove the snap ring.
Spring compressor : 5–8840–0254–0 (J–25048)

8. Piston

PLace the forward clutch drum onto the OD support.
Holding the forward clutch piston by hand, apply
compressed air to the OD support to remove the forward
clutch piton.

INSPECTION AND REPAIR

Check forward clutch piston

Check that check ball is free by shaking the piston. 
Check that the valve does not leak by applying low-pressure
compressed air.

Check forward clutch drum bushing

Using a dial indicator, measure the inside diameter of the
forward clutch drum bushing.

If the inside diameter is greater than the maximum, replace
the forward clutch drum.

mm (in.)

Maximum inside diameter

24.08 (0.948)

7A–144

AUTOMATIC TRANSMISSION (AW30-40LE)

248RY00045

247RY00034

Check disc, plate and flange

Check to see if the sliding surface of the disc, plate and
flange are worn or burnt. If necessary, replace them.

• If the lining of the disc is peeling off or discolored, or even

if parts of the printed numbers are defaced, replace all
discs.

• Before assembling new discs, soak them in ATF for at

least fifteen minutes.

Check piston return spring

Using calipers, measure the free length of the return spring.

mm (in.)

Standard length

19.47 (0.7665)