Clutch Component Disassembly/Assembly
CLUTCH COMPONENT DISASSEMBLY/ASSEMBLY1. Perform the preinspection before disassembly.
2. Disassemble in the order indicated in the table.
3. Assemble in the reverse order of disassembly.
Snap Ring (3-4 clutch) Disassembly Note
1. Install the SST as shown.
Caution: Depress the seal plate only enough to remove the snap ring. Overpressing will damage the seal plate assembly edges.
2. Compress the seal plate.
3. Remove the snap ring.
4. Remove the SST, then remove the seal plate and spring and retainer component.
3-4 Clutch Piston Disassembly Note
1. Set the 3-4 clutch drum onto the end cover.
2. Remove the 3-4 clutch piston from the 3-4 clutch drum by applying compressed air through the fluid passage.
Air pressure 392 kPa (4.0 kgf/cm2, 57 psi) max.
Snap Ring (Reverse clutch) Disassembly Note
1. Install the SSTs as shown.
Caution: Depress the piston return spring only enough to remove the snap ring. Overpressing will damage the piston return spring assembly edges.
2. Compress the piston return spring.
3. Remove the snap ring.
4. Remove the SSTs, then remove the reverse return stopper and return spring.
Reverse Piston Disassembly Note
1. Set the 2-4 brake drum onto the end cover.
2. Remove the reverse piston from the 2-4 brake drum by applying compressed air through the fluid passage.
Air pressure 392 kPa (4.0 kgf/cm2, 57 psi) max.
Assembly Procedure
1. Measure the facing thickness in three places and calculate the average value.
Drive plate part number: FN11 19 370
Standard: 1.60 mm (0.063 inch)
Minimum: 1.45 mm (0.057 inch)
Drive plate part number: FNE1 19 370
Standard: 2.55 mm (0.100 inch)
Minimum: 2.40 mm (0.094 inch)
B not within the specification replace the drive plates.
2. Measure the free length of the spring and inspect for deformation.
Spring free length
Standard: 17.2 mm (0.677 inch)
Minimum: 15.2 mm (0.598 inch)
^ If not within the specification, replace the spring and retainer.
3. Verify that there is airflow when applying compressed air through the fluid passage of 3-4 clutch drum.
Air pressure 392 kPa (4.0 kgf/cm2, 57 psi) max.
4. Replace the 3-4 clutch drum if damaged or malfunctioning.
5. Verify that there is airflow when applying compressed air through the fluid passage of 2 2-4 drum.
Air pressure 392 kPa (4.0 kgf/cm2, 57 psi) max.
6. Replace the 2-4 brake drum if damaged or malfunctioning.
7. Measure the bushing of the rear sun gear.
Bushing inner diameter
Standard: 29.900 - 29.921 mm (1.17717 - 1.17799 inch)
Maximum: 29.941 mm (1.17878 inch)
^ If not as specified, replace the rear sun gear plate.
8. Install the reverse clutch.
Caution: Installing the reverse clutch piston may damage its seal. Carefully install the reverse clutch piston by pushing evenly around the circumference
(1) Apply ATF to the circumference of the reverse clutch piston seal, and install the piston into the 2-4 brake Hr. drum.
(2) Install the piston return spring and reverse return stopper to the reverse piston.
(3) Install the snap ring and the SSTs to the 2-4 brake drum as shown.
Caution: Depress the piston return spring only enough to install the snap ring. Overpressing will damage the piston return spring assembly edges.
(4) Compress the piston return spring.
(5) Install the snap ring.
(6) Remove the SSTs.
(7) Install the dish plate.
(8) Install the drive and driven plates in the following order. Driven-Drive-Driven-Drive
(9) Install the retaining plate.
9. Measure the reverse clutch clearance.
(1) Install the reverse clutch into the end cover, and set the dial gauge.
(2) Secure the reverse clutch by lightly pressing down with a press or similar tool.
(3) Apply compressed air to the part indicated in the figure and let the reverse clutch piston stroke three times.
Air pressure 392 - 441 kPa (4.0 - 4.5 kgf/cm2, 57 - 63 psi)
(4) Apply compressed air and operate the reverse clutch piston. Read the value when the indicator of the dial gauge stops.
(5) Release the compressed air and read the dial gauge when the reverse clutch piston is not operating.
(6) Calculate the reverse clutch clearance according to the following formula: step (4) value - step (5) value = Reverse clutch clearance.
(7) Measure the clearances at four locations (90° apart) by following the steps from (3) to (6). Verify that the average value is within the specification below.
Reverse clutch clearance 1.00 - 1.30 mm (0.039 - 0.051 inch)
^ If not within the specification, remove the snap ring and measure its thickness.
(8) Add the thickness to the average value calculated in step (7), and select the snap ring whose range includes the value.
Snap ring sizes
(9) Install the selected snap ring and perform steps (2) to (7) again. Verify that the calculated value satisfies the clearance specification.
10. Inspect the reverse clutch operation.
(1) Install the 2-4 brake drum to the end cover.
(2) Inspect the reverse clutch operation by applying compressed air as shown
Air pressure 392 - 441 kPa (4.0 - 4.5 kgf/cm2, 57 - 63 psi)
11. Install the 3-4 clutch.
Caution: Installing the 3-4 clutch piston may damage its seal. Carefully install the 3-4 clutch piston by pushing evenly around the circumference.
(1) Apply ATF to the circumference of the 3-4 clutch piston seal, and install the piston in to the 3-4 clutch drum.
(2) Install the spring and retainer.
(3) Apply ATF to the 3-4 seal plate, and install it onto the 3-4 clutch drum.
(4) Install the SST as shown.
Caution: Depress the 3-4 seal plate only enough to install the snap ring. Overpressing will damage the 3-4 seal plate assembly edges.
(5) Compress the spring and retainer component and 3-4 seal plate.
(6) Install the snap ring.
(7) Remove the SST.
(8) Install the drive and driven plates in the following order.
Driven-Drive-Driven-Drive-Driven-Drive
(9) Install the retaining plate.