Isuzu KB P190. Service manual — part 1038
UNIT REPAIR (AW30–40LE)
7A4–17
5. Remove the overdrive planetary ring gear from the
transmission case.
252RY00002
6. Check piston stroke of overdrive brake
Place a dial indicator onto the overdrive brake
piston as shown in the figure.
252RY00003
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.
246RY00001
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).
246RY00026
9. Remove the thrust bearing and two races.
247RY00003
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.
252RY00005
12. Remove the race from OD support.
252RY00006
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.
248RY00004
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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.
248RY00006
15. Applying compressed air to the oil hole, remove the
second coast brake piston assembly.
248RY00007
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.
248RY00009
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