Low and Reverse Brake

COMPONENTS

DISASSEMBLY




1. Check operation of low and reverse brake.
a. Install seal ring onto oil pump cover and install reverse clutch. Apply compressed air to oil hole.
b. Check to see that retaining plate moves to snap ring.
c. If retaining plate does not move to snap ring, D-ring or oil seal may be damaged or fluid may be leaking at piston check ball.




2. Remove snap ring, low and reverse brake drive plates, driven plates and dish plate.




3. Remove low one-way clutch inner race, spring retainer and return spring from transmission case.




4. Remove seal rings from low one-way clutch inner race.
5. Remove needle bearing from low one-way clutch inner race.




6. Remove low and reverse brake piston using compressed air.
7. Remove oil seal and D-ring from piston.

INSPECTION

Low and reverse brake snap ring and spring retainer
- Check for deformation, or damage.

Inspection Standard:

Low and reverse brake return springs
- Check for deformation or damage. Also measure free length and outside diameter.




Low and reverse brake drive plates
- Check facing for burns, cracks or damage.
- Measure thickness of facing.

Thickness of drive plate:
Standard value
1.6 mm (0.063 in)

Wear limit
1.4 mm (0.055 in)

- If not within wear limit, replace.

Low one-way clutch inner race




- Check frictional surface of inner race for wear or damage.




- Install a new seal rings onto low one-way clutch inner race.
- Be careful not to expand seal ring gap excessively.
- Measure seal ring-to-groove clearance. Inspection standard:

Standard value: 0.10 - 0.25 mm (0.0039 - 0.0098 in)
Allowable limit: 0.25 mm (0.0098 in)

- If not within allowable limit, replace low one-way clutch inner race.

ASSEMBLY




1. Install bearing onto one-way clutch inner race.
- Pay attention to its direction Black surface goes to rear side.
- Apply petroleum jelly to needle bearing.




2. Install oil seal and D-ring onto piston.
- Apply A.T.F. to oil seal and O-ring.




3. Install piston by rotating it slowly and evenly.
- Apply A.T.F. to inner surface of transmission case.




4. Install return springs, spring retainer and low one-way clutch inner race onto transmission case.




5. Install dish plate, low and reverse brake drive plates, driven plates and retaining plate.
- Two types of drive plates are used on the RE4RO3A transmission. One type uses a "waving" design and the other type uses a "flat" design. Either one can be installed first since they are interchangeable.

6. Install snap ring on transmission case.




7. Check operation of low and reverse brake clutch piston. Refer to "DISASSEMBLY".




8. Measure clearance between retaining plate and snap ring If not within allowable limit, select proper retaining plate.

Specified clearance:
Standard
1.1 - 1.5 mm (0.043 - 0.059 in)

Allowable limit
3.1 mm (0.122 in)

Retaining plate: Refer to Specifications. Mechanical Specifications




9. Install low one-way clutch inner race seal ring.
- Apply petroleum jelly to seal ring.
- Make sure seal rings are pressed firmly into place and held by petroleum jelly.