Low and Reverse Brake
LOW AND REVERSE BRAKEPre-Inspection
Low And Reverse Brake Operation
1. Check low and reverse brake operation by applying compressed air as shown.
Air pressure: 57 psi (392 kPa, 4.0 kg /CM2) MAXIMUM
Brake Clearance
1. Measure clearance between retaining plate and snap ring.
2. If not as specified, replace parts as necessary.
Low and reverse brake clearance: 0.083 - 0.094 inch (2.1 - 2.4 mm)
Disassembly
1. Remove snap ring.
2. Remove retaining plate.
3. Remove drive plates and driven plates (four of each.
4. Install SST (OK201 190 AA1) in transaxle case as shown.
5. Compress spring and retainer assembly.
6. Remove snap ring.
7. Remove SST (OK201 190 AA11), then remove spring and spring retainer assembly.
8. Remove low and reverse brake piston by applying compressed air through fluid passage.
Air pressure: 57 psi (392 kPa, 4.0 kg /CM2)
9. Remove outer seal and inner seal from low and reverse brake piston.
Inspection
Drive Plates
1. Measure facing thickness in three places, and determine average of three readings.
Standard: 0.063 inch (1.6 mm)
Minimum: 0.055 inch (1.4 mm)
2. If not within specification, replace drive plate(s).
Spring And Retainer Assembly
1. Measure spring free length and check for formation.
Free length of spring: 0.563 inch (14.3 mm)
2. If not within specification, replace spring and Retainer assembly.
Re-Assembly
1. Install low and reverse brake piston.
a. Apply ATF to inner and outer seals, and install them onto low and reverse brake piston.
Seal Ring Inner Diameter:
Inner Seal: 5.539 inch (140.7 mm)
Outer Seal: 6.713 inch (170.5 mm)
b. Face outer seal lip toward inside by gently rolling it down around circumference for easier installation into case.
c. Install low and reverse brake piston by pushing evenly around circumference, being careful not to damage outer seal.
2. Install spring and retainer assembly.
3. Install SST (OK201 190 AA1) in transaxle case.
4. Compress spring and retainer assembly.
5. Install snap ring with snap-ring pliers.
6. Remove SST (OK 201 190 AM).
7. Check low and reverse brake piston operation.
a. Pour in ATF until low and reverse brake piston is fully submerged.
b. Check that no bubbles come from between piston and seals when applying compressed air through fluid passage.
Air pressure: 57 psi (392 kPa, 4.0 kg/cm2)
8. Install drive and driven plates (four of each).
NOTICE:
Installation order.
Driven - Drive - Driven - Drive - Driven - Drive - Driven - Drive
9. Install retaining plate.
10. Install snap ring.
11. Measure low and reverse brake clearance.
a. Measure clearance between snap ring and low and reverse brake retaining plate.
b. If clearance is not within specification, adjust it by selecting a proper snap ring.
Low and reverse brake clearance: 0.094 - 0.083 inch (2.1 - 2.4 mm)
12. Check low and reverse brake operation by applying compressed air through fluid passage as shown in figure.
Air pressure: 57 psi (392 kPa, 4.0 kg/cM2) MAXIMUM
13. Remove snap ring, retaining plate, drive and driven plates and set aside for later assembly.