Overdrive Brake

DISASSEMBLY
1. CHECK O/D BRAKE PISTON MOVEMENT





a. Place the O/D support assembly onto the direct clutch assembly.





b. Apply compressed air (392 kPa, 4.0 kgf/cm2, 57 psi) into the oil passage as shown, and be sure that the O/D brake piston moves smoothly.





2. REMOVE THRUST WASHER FROM O/D SUPPORT





3. REMOVE PISTON RETURN SPRING
a. Place SST on the spring retainer, and compress the return spring with a press.
SST 09350-30020 (09350-07030)

NOTICE:
- Stop the press when the spring sheet is lowered to the place 1 - 2 mm (0.039 - 0.078 inch) from the snap ring groove, preventing the spring sheet from being de formed.
- Do not expand the snap ring excessively.

b. Using a screwdriver, remove the snap ring.
c. Remove the piston return spring.
4. REMOVE O/D BRAKE PISTON





a. Place the O/D support onto the direct clutch assembly.





b. Hold the O/D brake piston so it does not slant, and apply compressed air (392 kPa, 4.0 kgf/cm2, 57 psi) into the passage to remove the O/D brake piston.
c. Remove the 2 O-rings from the piston.





5. REMOVE 2 OIL SEAL RINGS

INSPECTION





1. INSPECT DISC, PLATE AND FLANGE
Check to see if the sliding surfaces of the disc, plate and flange are worn or burnt. If necessary, replace them.

HINT:
- If the lining of the disc is peeling off or discolored, or even if a part of the printed numbers is defaced, replace all discs.
- Before assembling new discs, soak them in ATF for at least 15 minutes.





2. CHECK O/D BRAKE PISTON RETURN SPRING
Measure the free length of the spring together with the spring seat.
Standard free length: 17.82 mm (0.702 inch)

REASSEMBLY





1. INSTALL OIL SEAL RING
a. Coat the 2 oil seal rings with ATF.
b. Install the 2 oil seal rings to the O/D support groove, then snug them down by squeezing their ends together.

NOTICE: Do not spread the ring ends more than necessary.

HINT: After installing the oil seal rings, check that they rotate smoothly.





2. INSTALL O/D BRAKE PISTON
a. Coat 2 new O-rings with ATF and install them on the O/D brake piston.
b. Being careful not to damage the O-rings, press the brake piston into the O/D support with both hands.
3. INSTALL PISTON RETURN SPRING





a. Install the piston return spring.





b. Place SST on the spring retainer, and compress the return spring with a press.
SST 09350-30020 (09350-07030)

NOTICE:
- Stop the press when the spring sheet is lowered to the place 1 - 2 mm (0.039 - 0.078 inch) from the snap ring groove, preventing the spring sheet from being de formed.
- Do not expand the snap ring excessively.

c. Using a screwdriver, install the snap ring. Make sure the end gap of the snap ring is not aligned with the cutout portion of the O/D support.





4. INSTALL THRUST WASHER
Coat the thrust washer with petroleum jelly and install it onto the O/D support.

HINT: Make sure that the lug shape matches the hole on the O/D support.





5. CHECK O/D BRAKE PISTON MOVEMENT
a. Place the O/D support assembly onto the direct clutch assembly.
b. Apply compressed air (392 kPa, 4.0 kgf/cm2, 57 psi) into the oil passage as shown, and make sure that the O/D brake piston moves smoothly.