2007 ISUZU KB P190 brake

UNIT REPAIR (AW30–40LE) 7A4–25
4. Check pack clearance of first and reverse brake.Using a thickness gauge, measure the clearance
between the plate and second brake drum as shown
in the figure.
Clearance: 0.70 – 1.22 mm (0.0276 – 0.0480 in)
If the values are nonstandard, check for an improper
installation.
248RY00016
5. Install second brake piston sleeve.
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6. Install one-way clutch in the transmission case.
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7. Install discs and plates (B –2).
Instal the 2.5 mm (0.098 in) thick plate with the
rounded edge side of the plate facing the disc.
Alternately install five discs and six plates (Disc first)
246RY00005

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ISUZU KB P190 2007

UNIT REPAIR (AW30–40LE) 7A4–27
11. Using snap ring pliers, install the snap ring.
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12. Coat the bearing race with petroleum jelly and installit onto the front planetary gear.
Bearing race diameter (Reference)
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13. Insert the second coast brake band to the transmission case.
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14. Install the E-ring and pin.
Install the pin through the brake band.
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Bearing race Diameter
Inside 34.3 mm (1.350 in)
Outside 47.8 mm (1.882 in)

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ISUZU KB P190 2007

7A4–30 UNIT REPAIR (AW30–40LE)
Coat the assembled bearing and race with
petroleum jelly and install it onto the forward
clutch.
Assembled bearing and race diameter
(Reference)
248RY00025
20. Assembly second coast brake piston assembly. Coat the oil seal ring with ATF and install it to the
second coast brake piston.
Install the washer, spring and piston to the piston
rod. Install the E-ring.
RUW37ASH004401
E ndOFCallout
21. Coat two new oil seals with ATF and install them to the piston cover.
Install the spring, second coast brake piston
assembly and piston cover to the transmission
case.
Using snap ring pliers, install the snap ring.
248RY00027
22. Check piston stroke of second coast brake Place a mark on the second coast brake piston rod
as shown in the figure.
248RY00005Using wire gauge, measure the stroke by applying
the compressed air (390 – 780 kPa or 57 – 114 psi)
as shown in the figure.
Piston stroke: 1.5 – 3.0 mm (0.059 – 0.118 in)
Inside
Outside
Bearing
and race 33.7 mm (1.33 in) 47.8 mm (1.88 in)
Legend (1) Second coast brake piston
(2) Oil seal
(3) Piston rod

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ISUZU KB P190 2007

UNIT REPAIR (AW30–40LE) 7A4–33
29. Check piston stroke of overdrive brake.Place a dial indicator onto the overdrive brake
piston as shown in the figure.
252RY00003Measure the stroke by applying and releasing the
compressed air (390 – 780 kPa or 57 – 114 psi) as
shown in the figure.
Piston stroke: 1.75 – 2.05 mm (0.0689 – 0.0807 in)
If the values are nonstandard, check for an improper
installation.
Available flange size
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Remove the snap ring.
246RY00001Remove one flange, four plates and four discs.
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3.3 mm (0.130 in) 3.8 mm (0.150 in)
3.5 mm (0.138 in) 3.9 mm (0.154 in)
3.6 mm (0.142 in) 4.0 mm (0.158 in)
3.7 mm (0.146 in)

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ISUZU KB P190 2007

7A4–36 UNIT REPAIR (AW30–40LE)
Diaassembly, Inspection and
Reassembly of minor Components
NOTE: The instructions here are organized so that you
work on only one component group at a time.
This will help avoid confusion from similar-looking parts
of different subassemblies being on your workbench at
the same time.
The component groups are inspected and repaired from
the converter housing side.
As much as possible, complete the inspection, repair
and reassembly before proceeding to the next
component group. If a component group cannot be
reassembled because parts are being ordered, be sure
to keep all parts of that group in separate container
while proceeding with disassembly, inspection, repair
and reassembly of other component groups.
Recommended ATF type DEXRON III.
General Cleaning Notes:
1. All disassembled parts should be washed clean and any fluid passages and holes should be blown
through with compressed air.
2. When using compressed air to dry parts, always aim away from yourself to prevent accidentally spraying
automatic transmission fluid in your face.
3. The recommended automatic transmission fluid should be used for cleaning.
Parts Arrangement:
1. After cleaning, the parts should be arranged inproper order to allow performing inspection, repairs,
and reassembly with efficiency.
2. When disassembling a valve body, be sure to keep each valve together with the corresponding spring.
3. New brakes and clutches that are to be used for replacement must be soaked in transmission fluid
for at least thirty minutes before assembly.
General Assembly:
1. All oil seal rings, clutch discs, clutch plates, rotating parts, and sliding surfaces should be coated with
transmission fluid prior to reassembly.
2. All gaskets and rubber O-ring should be replaced.
3. Make sure that the ends of a snap ring are not aligned with one of the cutouts and are installed in
the groove correctly.
4. If a worn bushing is to be replaced, the subassembly containing that bushing must be
replaced.
5. Check thrust bearings and races for wear or damage. Replace if necessary.
6. Use petroleum jelly or vaseline to keep parts in place.

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ISUZU KB P190 2007

7A4–52 UNIT REPAIR (AW30–40LE)
OD Support Assembly
Disassembled View
RTW77AMF000301
EndOFCallout
Disassembly
1. Check OD brake piston movement.Place the OD support assembly onto the direct
clutch assembly.
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Legend
(1) Snap ring
(2) Piston return spring
(3) O-ring (4) OD brake piston
(5) OD support
(6) Oil seal ring

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ISUZU KB P190 2007

UNIT REPAIR (AW30–40LE) 7A4–53
Apply compressed air into the oil passage as
shown, and be sure that the OD brake piston moves
smoothly.
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2. Remove the thrust bearing.
3. Remove the race.
4. Remove the thrust washer (plastic).
5. Place special tool on the spring retainer, and compress the return spring with a shop press.
Spring compressor : 5-8840-2170-0 Remove the snap ring with a screwdriver.
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6. Romove the piston return spring. 7. Place the OD support onto the direct clutch
assembly.
Hold the OD brake piston so it is not slanted and
apply compressed air into the passage to remove
the OD brake piston.
Remove the OD brake piston.
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8. Remove the O-ring and oil seal rings from OD support.
Inspection and Repair
Make necessary correction or parts replacement if wear,
damage or any abnormal conditions are found through
inspection.
1. Check piston return spring Using calipers, measure the free length of the return
spring.
Standard length: 17.2 mm (0.677 in)
252RY00046

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ISUZU KB P190 2007

7A4–54 UNIT REPAIR (AW30–40LE)
Reassembly
1. 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.
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2. Coat two new O-rings with ATF and install them on the OD brake piston.
3. Being careful not to damage the O-rings, press the brake piston into the OD support, using both hands.
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4. Install piston return spring.
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5. Place special tool on the spring retainer, andcompress the return spring with a shop press.
Spring compressor : 5-8840-2170-0
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.
252RY00050

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ISUZU KB P190 2007