Isuzu KB P190. Manual - part 1038

UNIT REPAIR (AW30–40LE)

7A4–17

5. Remove the overdrive planetary ring gear from the

transmission case.

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6. Check piston stroke of overdrive brake

Place a dial indicator onto the overdrive brake
piston as shown in the figure.

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Measure the stroke 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, select another flange.

Available flange sizes

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7. Remove the snap ring.

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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)

7A4–18

UNIT REPAIR (AW30–40LE)

8. Remove one flange, four plates and four discs (B–

0).

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9. Remove the thrust bearing and two races.

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10. Using snap ring pliers, remove the snap ring.

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11. Remove the OD support.

• Remove two bolts fixing the overdrive support

assembly to the transmission case.

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UNIT REPAIR (AW30–40LE)

7A4–19

• Install two removed bolts to the OD support, and

pull out the OD support assembly.

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12. Remove the race from OD support.

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13. Check piston stroke of second coast brake (B–1)

Place a mark on the second coast brake piston rod
as shown in the figure.
Using feeler gauge, measure the stroke applying
the compressed air (390 – 780 kPa or 57 – 114 psi)
as shown in the figure.

Piston stroke: 1.5 – 3.0mm (0.059 – 0.118in)

If the values are nonstandard, replace piston rod
and recheck piston stroke. 
If piston stroke is nonstandard, replace brake band.

There are two piston rods.

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Rod length

78.4 mm (3.09 in)
79.9 mm (3.15 in)

7A4–20

UNIT REPAIR (AW30–40LE)

14. Using snap ring pliers, remove the snap ring.

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15. Applying compressed air to the oil hole, remove the

second coast brake piston assembly.

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16. Remove the direct clutch and forward clutch from

the transmission case.

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17. Remove the E-ring from the pin.

Remove the pin from the brake band.

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