Isuzu KB P190. Manual - part 1047

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: 17.2mm (0.677in)

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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, and

compress 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.

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UNIT REPAIR (AW30–40LE)

7A4–55

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

and install it onto the OD support.

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

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

the OD support.
Race diameter (Reference)

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8. Turn over OD support.

Coat the two races with petroleum jelly, and install
them onto the OD support.
Race and bearing diameter (Reference)

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9. Check OD brake piston movement.

Place the OD support assembly onto the direct
clutch assembly.

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Inside diameter

36.7mm (1.44 in)

Outside diameter

50.85  mm (2.00  in)

Inside

Outside

Race (A)

37.2 mm (1.465in)

58.8mm (2.315in)

Bearing and 
race (B)

33.7 mm (1.327in)

50.1mm (1.972in)

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.

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