2007 ISUZU KB P190 brake

UNIT REPAIR (AW30–40LE) 7A4–55
6. Coat the thrust washer (plastic) with petroleum jellyand install it onto the OD suppor t.
NOTE: Make sure that the lug fits into the hole on the
OD support.
252RY00051
7. Coat the race with petroleum jelly, and install it onto the OD support.
Race diameter (Reference)
252RY00052
8. Turn over OD suppor t. Coat the two races with petroleum jelly, and install
them onto the OD support.
Race and bearing diameter (Reference)
252RY00069
9. Check OD brake piston movement. Place the OD support assembly onto the direct
clutch assembly.
252RY00042
Inside diameter 36.7 mm (1.44 in)
Outside diameter 50.85 mm (2.00 in)
Inside Outside
Race (A) 37.2 mm (1.465 in) 58.8 mm (2.315 in)
Bearing and
race (B) 33.7 mm (1.327 in) 50.1 mm (1.972 in)

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

7A4–56 UNIT REPAIR (AW30–40LE)
Apply compressed air into the oil passage as
shown, and be sure that the OD brake piston moves
smoothly.
252RY00043

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

UNIT REPAIR (AW30–40LE) 7A4–73
Disassembly
1. 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
E ndOFCallout
2. Remove the one-way clutch and second brake hub.
3. Remove the trust washer (plastic).
4. Remove two oil seal rings (metal).
248RY00052
5. Remove the snap ring with snap ring pliers.
248RY00053
6. Remove the sun gear input drum.
7. Remove the snap ring from planetary sun gear.
Inspection and Repair
1. Check planetary sun gear bushing Using a dial indicator, measure the inside diameter
of the planetary sun gear bushing.
Maximum inside diameter: 27.08 mm (1.066 in) If the inside diameter is greater than the maximum,
replace the planetary sun gear.
248RY00054
Legend
(1) Free
(2) Lock

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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.
246RY00011
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

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

UNIT REPAIR (AW30–40LE) 7A4–79
9. Install second brake assembly to output shaft.
246RY00014

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007