Page 4209 of 6020
7A4–74 UNIT REPAIR (AW30–40LE)
Reassembly
1. Install snap ring to planetary sun gear.
248RY00055
2. Place a wooden block, etc. as a work stand andplace the planetary sun gear onto it.
Install the sun gear input drum onto the planetary
sun gear.
248RY00056
3. Install snap ring with snap ring pliers.
248RY00053
4. Coat the two oil seal rings (metal) with ATF. Install the two oil seal rings onto the planetary sun
gear.
NOTE: Do not spread the ring ends too much.
248RY00052
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ISUZU KB P190 2007
Page 4210 of 6020
UNIT REPAIR (AW30–40LE) 7A4–75
5. Install thrust washer (plastic).
NOTE: Make sure that the lugs fit into the holes on the
sun gear input drum.
248RY00057
6. Install assembled No.1 one-way clutch and second brake hub onto planetary sun gear as shown.
248RY00058
7. Check operation of No.1 one-way clutchHold the planetary sun gear and turn the second
brake hub.
The second brake hub should turn freely clockwise
and should lock counterclockwise.
RUW37ASH004601
En dOFCallout
Legend
(1) Free
(2) Lock
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ISUZU KB P190 2007
Page 4211 of 6020
7A4–76 UNIT REPAIR (AW30–40LE)
Second Brake Assembly (B–2)
Disassembled View
246R200001
EndOFCallout
Disassembly
1. Remove second brake assembly from output shaft.
246RY00007
Legend(1) Second brake assembly
(2) Thrust washer (Plastic)
(3) Snap ring
(4) Spring retainer (5) Piston return spring
(6) Piston sleeve
(7) Second brake piston
(8) O-ring
(9) Second brake drum
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ISUZU KB P190 2007
Page 4212 of 6020

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.
247RY00001
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.
246RY00008
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)
247RY00034
Reassembly
1. Coat new O-rings with ATF and install them on the second brake piston.
246RY00009
2. Being careful not to damage the O-rings, press inthe second brake piston into the second brake
drum.
3. Install piston sleeve.
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ISUZU KB P190 2007
Page 4213 of 6020
7A4–78 UNIT REPAIR (AW30–40LE)
4. Install piston return spring.
246RY00010
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.
247RY00001
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.
246RY00012
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ISUZU KB P190 2007
Page 4214 of 6020
UNIT REPAIR (AW30–40LE) 7A4–79
9. Install second brake assembly to output shaft.
246RY00014
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ISUZU KB P190 2007
Page 4215 of 6020
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
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ISUZU KB P190 2007
Page 4216 of 6020
UNIT REPAIR (AW30–40LE) 7A4–81
Disassembly
1. Remove second brake assembly from output shaft.
246RY00014
2. Remove oil seal ring from output shaft.
247RY00028
3. Remove the seven discs, seven plates and flange(B–3). 4. Remove rear planetary gear from rear planetary ring
gear.
247RY00029
5. Check operation of No.2 one-way clutch.Hold the planetary gear and turn the one-way clutch
inner race.
The one-way clutch inner race should turn freely
counterclockwise and should lock clockwise.
RUW37ASH004701
En dOFCallout
Legend
(1) Lock
(2) Free
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ISUZU KB P190 2007