Forward clutch

1. 1
   Inspect forward clutch (see page ax-227)
2. 2
   Remove forward multiple disc clutch disc

   

1. 1
   Using a screwdriver, remove the snap ring.
2. 2
   Remove the flange , 5 discs and 5 plates from the input shaft.
3. 3
   Inspect forward multiple disc clutch disc (see page ax-228)

   

4. Remove forward clutch return spring sub-assembly

1. Place sst on the spring retainer and compress the return spring with a press.

1. 1
   Using a snap ring expander, remove the snap ring.
2. 2
   Remove the piston return spring.
3. 3
   Inspect forward clutch return spring sub-assembly (see page ax-228)

   

6. Remove forward clutch piston subassembly

1. 1
   Place the forward clutch drum onto the oil pump.
2. 2
   Holding the forward clutch piston with your hand, apply compressed air (392 kpa, 4.0Kgf/cm2, 57 psi) to the oil pump to remove the forward clutch piston.

When the piston is slanted and cannot be removed, remove it by pushing down the protruding side and applying compressed air again, or using needlenose pliers (with its tips wrapped in tape).

1. 1
   Using a screwdriver, pry out the 2 o-rings.
2. 2
   Remove forward clutch piston subassembly (see page ax-228)

   

8. Remove input shaft oil seal ring

1. Inspect pack clearance of forward clutch

1. Install the forward clutch on the oil pump.

Be careful not to damage the oil seal ring of oil pump.

2. Using a dial indicator, measure the forward clutch piston stroke while applying and releasing compressed air (392 kpa, 4.0 Kgf/cm2, 57 psi)

If the piston stroke is less than the minimum, the parts may have been assembled incorrectly. Check and reassemble again.

If the clearance is not as specified, select another flange.

As the opening is big, cover it with a shop rag to prevent the compressed air from being discharged.

2. Inspect forward multiple disc clutch disc

1. Check to see if the sliding surface of the disc, plate and flange are worn or burnt.

• If the lining of the disc is peeling off or discolored, replace all discs.
• Before assembling new discs, soak them in atf for at least 15 minutes.

3. Inspect forward clutch return spring sub-assembly

1. Using a vernier caliper, measure the free length of the spring together with the spring seat.

4. Inspect forward clutch piston subassembly

1. Shake the piston to check that the check ball is not stuck.

2. Check that air does not leak from the valve when applying low compressed air (392 kpa, 4.0 Kgf*cm2, 57 psi)

1. Install input shaft oil seal ring

1. Compress the oil seal ring from both sides to reduce dimension a

1. 1
   Coat the oil seal ring with atf and install it to the input shaft.
2. 2
   Install forward clutch piston subassembly

   

1. Coat 2 new o-rings with atf, and install them to the forward clutch piston.

1. 1
   Install the forward clutch piston to the forward clutch drum.
2. 2
   Install forward clutch return spring sub-assembly

   

1. Place the return spring onto the piston.

1. 1
   Place sst on the return spring, and compress the return spring with a press.
2. 2
   Install the snap ring with a snap ring expander. Be sure the end gap of the snap ring is not aligned with the spring retainer claw.

• Stop the press when the spring sheet is lowered to the place 1 to 2 mm (0.039 To 0.078 In.) From the snap ring groove.
• This prevents the spring sheet from being deformed.
• Do not expand the snap ring excessively.

4. Set the end gap of the snap ring in the piston shown in the illustration.

The end gap of the snap ring should not coincide with any of the stoppers.

1. 1
   Install forward multiple disc clutch disc
2. 2
   Install the 5 plates, 5 discs and flange.

P = plate

D = disc

F = flange

1. 1
   Using a screwdriver, install the snap ring.
2. 2
   Check that the end gap of the snap ring is not aligned with one of the cutouts.

   

5. Inspect pack clearance of forward clutch

1. Install the forward clutch on the oil pump.

Be careful not to damage the oil seal ring of the oil pump.

2. Using a dial indicator, measure the forward clutch piston stroke while applying and releasing compressed air (392 kgf/cm2, 4.0 Kpa, 57 psi)

If the piston stroke is less than the minimum, parts may have been assembled incorrectly. Check and reassemble again. If the clearance is not as specified, select another flange.

There are 5 different flanges in thickness.

Standard flange thickness

6. Inspect forward multiple disc clutch clutch disc

1. 1
   Inspect the clutch disc rotation.
2. 2
   After inserting the multiple disc clutch into the multiple disc clutch hub, rotate the forward clutch and check that the disc lightly rotates.

Do not place the forward clutch in a vise.