Isuzu KB P190. Manual - part 1053

UNIT REPAIR (AW30–40LE)

7A4–77

2. Remove the hrust washer (plastic).

3. Place special tool on the spring retainer, and

compress the return spring.
Spring compressor: 5-8840-0254-0
Remove the snap ring with snap ring pliers.

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4. Remove the spring retainer and piston return spring.

5. Romove piston sleeve.

6. Holding the second brake piston by hand, apply

compressed air to the second brake drum to remove
the second brake piston.
Remove the second brake piston from the second
brake drum.

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7. Remove the o-rings from the second brake piston.

Inspection and Repair

1. Check piston return spring.

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

Standard length: 18.38  mm (0.724  in)

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Reassembly

1. Coat new O-rings with ATF and install them on the

second brake piston.

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2. Being careful not to damage the O-rings, press in

the second brake piston into the second brake
drum.

3. Install piston sleeve.

7A4–78

UNIT REPAIR (AW30–40LE)

4. Install piston return spring.

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5. Install spring retainer.

6. Place special tool on the spring retainer, and

compress the return spring.
Spring compressor: 5-8840-0254-0
Install the snap ring with snap ring pliers. 
Be sure the end gap of the snap ring is not aligned
with the spring retainer claw.

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7. Check second brake piston movement.

Make sure the second brake piston moves smoothly
when applying and releasing the low compressed
air to the second brake drum.

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8. Coat the thrust washer (plastic) with petroleum jelly

and install it to the second brake piston, with the
grooved side facing upward.

NOTE:  Make sure that the cutout portions of the thrust
washer match the teeth of the spring retainer.

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UNIT REPAIR (AW30–40LE)

7A4–79

9. Install second brake assembly to output shaft.

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7A4–80

UNIT REPAIR (AW30–40LE)

Rear Planetary Gear Assembly and Output Shaft

Disassembled View

RTW77ALF001601

EndOFCallout

Legend

(1) Snap ring
(2) One-way clutch assembly
(3) Thrust washer
(4) Rear planetary gear
(5) Rear planetary gear assembly
(6) Thrust washer

(7) Thrust bearing race
(8) Thrust bearing with race
(9) Rear planetary ring gear

(10) Ring gear flange
(11) Snap ring
(12) Thrust needle roller bearing
(13) Output shaft