Isuzu Trooper (1998-2002 year). Service manual - part 733

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–129

REASSEMBLY

252RY00068

Reassembly steps

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 1. Oil seal ring

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 2. O-ring

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 3. OD brake piston

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 4. Piston return spring

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 5. Snap ring

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 6. Thrust washer (Plastic)

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 7. Race

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 8. Thrust bearing

7A–130

AUTOMATIC TRANSMISSION (AW30-40LE)

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Important operations

1. Oil seal ring

Coat the two oil seal rings with ATF.
Contract the oil seals as shown, and install them onto the
OD support.

NOTE:  
Do not spread the ring ends more than necessary.

2. O-ring

Coat two new O-rings with ATF and install them on the OD
brake piston.

3. OD brake piston

Being careful not to damage the O-rings, press in the brake
piston into the OD support, using both hands.

4. Piston return spring 

Install piston return spring.

5. Snap ring

Place special tool on the spring retainer, and compress the
return spring with a shop press.
Spring compressor: 5-8840-2170-0 (J-37233)
Install the snap ring with a screwdriver. Be sure the end gap
of the snap ring is not aligned with cutout portion of the OD
support.

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–131

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6. Thrust washer (plastic)

Coat the thrust washer with petroleum jelly and install it onto
the OD support.

NOTE:  
Make sure that the lug fits into the hole on the OD support.

7. Race

Coat the race with petroleum jelly, and install it onto the OD
support.

8. Thrust bearing

Turn over OD support.
Coat the two races with petroleum jelly, and install them
onto the OD support.

Race diameter (Reference) 

mm (in.)

Inside diameter

36.8 (1.449)

Outside diameter

50.9 (2.004)

Race and bearing diameter (Reference) 

mm (in.)

Inside

Outside

Race (A)

37.2 (1.465)

58.8 (2.315)

Bearing

36.5 (1.437)

48.5 (1.910)

Race (B)

33.7 (1.327)

50.1 (1.973)

7A–132

AUTOMATIC TRANSMISSION (AW30-40LE)

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Check OD brake piston
Place the OD support assembly onto the direct clutch
assembly.

Apply compressed air into the oil passage as shown, and be
sure that the OD brake piston moves smoothly.