Page 3865 of 4264
UNIT REPAIR (AW30–40LE) 7A4–57
Apply compressed air into the oil passage as
shown, and be sure that the OD brake piston moves
smoothly.
25 2RY 0 004 3
Page 3866 of 4264
7A4–58 UNIT REPAIR (AW30–40LE)
Direct Clutch Assembly (C-2)
Disassembled View
2 48R20 0001
E nd O FCallo ut
Legend
(1) Clutch drum thrust washer (Plastic)
(2) Snap ring
(3) Flange
(4) Plate and disc
Five plates and five discs(5) Snap ring
(6) Piston return spring
(7) Direct clutch drum
(8) Direct clutch piston
(9) O-ring
Page 3867 of 4264
UNIT REPAIR (AW30–40LE) 7A4–59
Disassembly
Remove direct clutch drum assembly from forward
clutch assembly.
24 8RY 0 002 8
1. Check piston stroke of direct clutch (C–2).
Place the direct clutch assembly onto the OD
support assembly.
24 8RY 0 002 9
Using a dial indicator, measure the direct clutch
piston stroke by applying and releasing compressed
air (390 – 780 kPa or 57 – 114 psi) as shown.
Pack clearance: 0.4 – 0.7 mm (0.016 – 0.028 in)
RUW3 7A SH00 4901
2. Remove the clutch drum thrust washer (Plastic)
from the rear end of direct clutch.
3. Remove the snap ring from the direct clutch drum.
4. Remove the flange, plates and discs.
5. Place special tool on the spring retainer and
compress the return spring.
Using snap ring pliers, remove the snap ring.
Spring compressor : J–25048
24 8RY 0 0002
6. Remove the piston return spring.
Page 3868 of 4264
7A4–60 UNIT REPAIR (AW30–40LE)
7. Place the direct clutch drum onto the OD support.
Holding the direct clutch piston by hand, apply
compressed air to the OD support to remove the
direct clutch piston.
Remove the direct clutch piston from direct clutch
drum.
24 8RY 0 003 0
8. Remove two O-rings from piston.
Inspection and Repair
1. Check piston return spring.
Using calipers, measure the free length of the return
spring.
Standard length: 21.3 mm (0.839 in)
24 7RY 0 003 4
2. Check discs.
Using micrometer, measure the thickness of the
discs.
Minimum thickness: 2.04 mm (0.0803 in)
If the thickness is less than the minimum, replace
the disc.
25 2RY 0 0027
3. Check direct clutch piston.
Check that check ball is free by shaking the piston.
Check that the valve does not leak by applying
low-pressure compressed air.
24 8RY 0 0031
Page 3869 of 4264
UNIT REPAIR (AW30–40LE) 7A4–61
4. Check direct clutch drum bushing.
Using a dial indicator, measure the inside diameter
of the clutch drum bushing.
Maximum inside diameter: 53.99 mm (2.1256 in)
If the inside diamater is greater than the maximum,
replace the clutch drum.
24 8RY 0 003 2
Reassembly
1. Coat new O-rings with ATF and install them on the
direct clutch piston.
2. Install direct clutch piston to direct clutch drum.
Being careful not to damage the O-rings, press in
the direct clutch piston into the clutch drum, using
both hands.
24 8RY 0 003 3
3. Install piston return spring.
24 8RY 0 0034
4. Compress piston return spring and install snap ring
in groove.
Place special tool on the spring retainer, and
compress the return spring.
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.
Spring compressor: J–25048
24 8RY 0 0002
Page 3870 of 4264
7A4–62 UNIT REPAIR (AW30–40LE)
5. Install four plates and four discs.
Install in order : P–D–P–D–P–D–P–D
P : Plate, D : Disc
24 8RY 0 006 2
6. Install the flange, with the flat side facing downward.
24 8RY 0 003 5
7. Install the snap ring with a screwdriver.
Be sure the end gap of the snap ring is not aligned
with the cutout portion of the direct clutch drum.
24 8RY 0 0036
8. Check piston stroke of direct clutch (C–2).
Place the direct clutch assembly onto the OD
support assembly.
24 8RY 0 0029Using a dial indicator, measure the direct clutch
piston stroke by applying and releasing compressed
air (390 – 780 kPa or 57 – 114 psi) as shown.
Pack clearance: 0.4 – 0.7 mm (0.016 – 0.028 in)
If the piston stroke is not within specification,
replace the discs and recheck the piston stroke.
If the piston stroke is nonstandard, select another
flange.
Page 3871 of 4264
UNIT REPAIR (AW30–40LE) 7A4–63
Flange sizes
RUW 37A SH00 490 1
9. Coat the clutch drum thrust washer (plastic) with
petroleum jelly and install it onto the direct clutch.
NOTE: Make sure that the lugs fit into the cutout
portions on the direct clutch.
24 8RY 0 003 7
Align the flukes of discs in the direct clutch.
Install the direct clutch assembly onto the forward
clutch assembly.
Check that the distance from the direct clutch end to
the forward clutch end is 71.2 mm (2.803 in).
24 8RY 0 0038
Flange thickness Flange thickness
3.3 mm (0.130 in) 3.8 mm (0.150 in)
3.4 mm (0.134 in)—
3.5 mm (0.138 in) 4.0 mm (0.157 in)
3.6 mm (0.142 in)—
3.7 mm (0.146 in) 4.2 mm (0.165 in)
Page 3872 of 4264
7A4–64 UNIT REPAIR (AW30–40LE)
Forward Clutch Asseembly (C-1)
Disassembled View
2 48R20 0003
E nd O FCallo ut
Legend
(1) Thrust bearing
(2) Race
(3) Snap ring
(4) Flange
(5) Disc and plate
Six discs and six plates
(6) Cushion plate(7) Snap ring
(8) Piston return spring
(9) Piston
(10) O-ring
(11) O-ring
(12 Oil seal ring
(13) Thrust bearing
(14) Forward clutch drum