Overdrive Brake

OVERDRIVE BRAKE

Components





O/D 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 into the oil passage as shown, and be sure that the O/D brake piston moves smoothly.
2. REMOVE CLUTCH DRUM 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.
b. Remove the snap ring with a screwdriver.
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 into the passage to remove the O/D brake piston.
c. Remove the O/D brake piston.
d. Remove the 2 O-rings from the piston.





5. REMOVE 2 OIL SEAL RINGS


O/D Brake Inspection
INSPECT DISC, PLATE AND FLANGE
Check to see if the sliding surface 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 are defaced, replace all discs.


O/D Brake Assembly
1. INSTALL OIL SEAL RINGS
a. Coat 2 oil seal rings with ATF.



b. Install the 2 oil seal rings to the O/D support groove, then settle them down by squeezing their ends together.

NOTICE: Do not squeeze 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 0-rings with ATF and install them on the O/D brake piston.
b. Being careful not to damage the O-rings, press in 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.
c. 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 O/D support.





4. INSTALL CLUTCH DRUM 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 into the oil passage as shown, and be sure that the O/D brake piston moves smoothly.