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UNIT REPAIR (AW30–40LE) 7A4–73
Planetary Sun Gear and No.1 One-Way Clutch
Disassembled View
2 48R20 0005
E nd O FCallo ut
Legend
(1) One-way clutch and second brake hub
(2) Thrust washer (plastic)
(3) Oil seal ring (Metal)(4) Snap ring
(5) Sun gear input drum
(6) Snap ring
(7) Planetary sun gear
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7A4–74 UNIT REPAIR (AW30–40LE)
Disassembly
1. Check operation of No.1 one-way clutch
Hold the planetary sun gear and turn the second
brake hub.
The second brake hub should turn freely clockwise
and should lock counterclockwise.
RUW 37A SH00 460 1
E nd OFCa llou t
2. Remove the one-way clutch and second brake hub.
3. Remove the trust washer (plastic).
4. Remove two oil seal rings (metal).
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5. Remove the snap ring with snap ring pliers.
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6. Remove the sun gear input drum.
7. Remove the snap ring from planetary sun gear.
Inspection and Repair
1. Check planetary sun gear bushing
Using a dial indicator, measure the inside diameter
of the planetary sun gear bushing.
Maximum inside diameter: 27.08 mm (1.066 in)
If the inside diameter is greater than the maximum,
replace the planetary sun gear.
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Legend
(1) Free
(2) Lock
Page 3883 of 4264
UNIT REPAIR (AW30–40LE) 7A4–75
Reassembly
1. Install snap ring to planetary sun gear.
24 8RY 0 005 5
2. Place a wooden block, etc. as a work stand and
place the planetary sun gear onto it.
Install the sun gear input drum onto the planetary
sun gear.
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3. Install snap ring with snap ring pliers.
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4. Coat the two oil seal rings (metal) with ATF.
Install the two oil seal rings onto the planetary sun
gear.
NOTE: Do not spread the ring ends too much.
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7A4–76 UNIT REPAIR (AW30–40LE)
5. Install thrust washer (plastic).
NOTE: Make sure that the lugs fit into the holes on the
sun gear input drum.
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6. Install assembled No.1 one-way clutch and second
brake hub onto planetary sun gear as shown.
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7. Check operation of No.1 one-way clutch
Hold the planetary sun gear and turn the second
brake hub.
The second brake hub should turn freely clockwise
and should lock counterclockwise.
RUW3 7A SH00 4601
E nd OFCa llou t
Legend
(1) Free
(2) Lock
Page 3885 of 4264
UNIT REPAIR (AW30–40LE) 7A4–77
Second Brake A ssembly (B–2)
Disassembled View
2 46R20 0001
E nd O FCallo ut
Disassembly
1. Remove second brake assembly from output shaft.
24 6RY 0 0007
Legend
(1) Second brake assembly
(2) Thrust washer (Plastic)
(3) Snap ring
(4) Spring retainer(5) Piston return spring
(6) Piston sleeve
(7) Second brake piston
(8) O-ring
(9) Second brake drum
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7A4–78 UNIT REPAIR (AW30–40LE)
2. Remove the hrust washer (plastic).
3. Place special tool on the spring retainer, and
compress the return spring.
Spring compressor: J–25048
Remove the snap ring with snap ring pliers.
24 7RY 0 000 1
4. Remove the spring retainer and piston return spring.
5. Romove piston sleeve.
6. Holding the second brake piston by hand, apply
compressed air to the second brake drum to remove
the second brake piston.
Remove the second brake piston from the second
brake drum.
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7. Remove the o-rings from the second brake piston.
Inspection and Repair
1. Check piston return spring.
Using calipers, measure the free length of the return
spring.
Standard length: 18.38 mm (0.724 in)
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Reassembly
1. Coat new O-rings with ATF and install them on the
second brake piston.
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2. Being careful not to damage the O-rings, press in
the second brake piston into the second brake
drum.
3. Install piston sleeve.
Page 3887 of 4264
UNIT REPAIR (AW30–40LE) 7A4–79
4. Install piston return spring.
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5. Install spring retainer.
6. Place special tool on the spring retainer, and
compress the return spring.
Spring compressor: J–25048
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.
24 7RY 0 000 1
7. Check second brake piston movement.
Make sure the second brake piston moves smoothly
when applying and releasing the low compressed
air to the second brake drum.
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8. Coat the thrust washer (plastic) with petroleum jelly
and install it to the second brake piston, with the
grooved side facing upward.
NOTE: Make sure that the cutout portions of the thrust
washer match the teeth of the spring retainer.
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7A4–80 UNIT REPAIR (AW30–40LE)
9. Install second brake assembly to output shaft.
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