OVERDRIVE BRAKE AND COAST CLUTCH DRUM COMPONENT DISASSEMBLY/ASSEMBLY

id051300262100

Overdrive Brake and Coast Clutch Drum Component

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1
Overdrive brake drum
2
Coast clutch piston outer seal ring
3
Coast clutch piston inner seal ring
4
Coast clutch piston
5
Overdrive piston spring
6
Coast clutch piston spring retainer
7
Retaining ring
8
Coast clutch external spline plate (steel)
9
Coast clutch internal spline plate (friction)
10
Coast clutch pressure plate
11
Retaining ring (select fit)


Disassembly

1.  Remove the coast clutch pressure plate.

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(1)  Remove the retaining ring.
(2)  Remove the coast clutch pressure plate.

2.  Remove the coast clutch disc pack.

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•  Inspect for wear, install a new pack as necessary.

Warning
•  Use caution when releasing tool pressure on the piston spring. Failure to follow these instructions may result in personal injury.
Caution
•  Do not fully compress the SST or damage to the spring retainer may occur.

3.  Using the SST, remove the retaining ring.

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4.  Relieve the coast clutch spring tension and remove the SST.

5.  Remove the coast clutch piston springs.

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(1)  Remove the coast clutch piston spring retainer.
(2)  Remove the coast clutch piston springs.

Warning
•  Air pressure must not exceed 138 kPa {20 psi}. Wear safety glasses when using compressed air and make sure the drum is facing down as shown. Failure to follow these instructions may result in personal injury.

6.  Remove the coast clutch piston.

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•  Apply air pressure to the hole in the drum to remove the coast clutch piston while blocking the other hole with a finger.

7.  Remove and discard the coast clutch piston inner seal and the coast clutch piston outer seal.

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Assembly

Caution
•  The lip seals must be positioned as shown. Care must be taken to prevent rollover of the lip seal.

1.  Install the new coast clutch piston inner and outer seal.

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2.  Verify the check ball is free to move.

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Caution
•  Care must be taken to prevent damage to the seals during installation.

3.  Install the coast clutch piston.

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•  Lubricate the seals with transmission fluid.

4.  Install the coast clutch piston springs.

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(1)  Install the coast clutch piston springs.
(2)  Install the coast clutch piston spring retainer.

Caution
•  Do not fully compress the SST or damage to the coast clutch piston spring retainer may occur.

5.  Using the SST, install the spring retainer ring.

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Caution
•  Coast clutch friction plates are directional and must be installed with grooves clockwise (ID to OD). The word TOP should face up.
•  If new clutch plates are being used, they should be soaked in clean ATF before assembly.

6.  When installing friction plates, the word TOP should face up. If reusing plates, grooves must be installed clockwise. Install the coast clutch disc pack.

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7.  Install the 2 steel clutch plates and 2 friction clutch plates in alternating order starting with a steel clutch plate.

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Caution
•  The retaining ring is select fit.

8.  Install the coast clutch pressure plate.

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(1)  Install the coast clutch pressure plate.
(2)  Install the original retaining ring.

Warning
•  Air pressure must not exceed 138 kPa {1.4 kgf/cm2, 20 psi}. Wear safety glasses when using compressed air and make sure drum is facing down as shown. Failure to follow these instructions may result in personal injury.

9.  Air check the assembly.

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•  Apply air pressure to the hole in the drum while blocking the other hole with a finger.

10.  Check the coast clutch disc pack free play.

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(1)  Push down on the coast pressure plate.
(2)   Check clearance between the coast clutch retaining ring and coast pressure plate. Clearance should be 1.3—2.0 mm {0.051—0.079 in}. If clearance is not within the specification, install a correct coast clutch retaining ring that will provide the correct free play adjustment.
Coast clutch clearance
Standard: 1.3—2.0 mm {0.051—0.079 in}

Retaining ring size for coast clutch clearance

Thickness

Diameter

mm

in

mm

in
1.37
0.0539
130.1
5.122
1.73
0.0681
130.1
5.122
2.08
0.0819
130.1
5.122
2.44
0.0961
130.1
5.122