Forward Clutch

FORWARD CLUTCH

Components





Forward Clutch Disassembly





1. REMOVE FORWARD CLUTCH FROM DIRECT CLUTCH





2. PLACE FORWARD CLUTCH ONTO OVERDRIVE SUPPORT
a. Place wooden blocks or similar, to prevent forward clutch shaft from touching the work stand, and place the O/D support on them.
b. Place the forward clutch onto the O/D support.





3. CHECK PACK CLEARANCE OF FORWARD CLUTCH
Using SST and a dial indicator, measure the forward clutch piston stroke while applying and releasing compressed air (392-785 kPa, 4-8 kgf/cm', 57-114 psi).

Pack clearance: 0.60 - 1.00 mm (0.0236 - 0.0394 inch)

If the values are non-standard, inspect the discs.





4. REMOVE FLANGE, PLATES AND DISCS
a. Using a screwdriver, remove the snap ring from the forward clutch drum.
b. Remove the flange, plates and discs.

5. REMOVE CUSHION PLATE





6. REMOVE PISTON RETURN SPRING
a. Place SST on the spring retainer and compress the return spring with a press.
b. Using a snap ring expander, remove the snap ring.
c. Remove the piston return spring.





7. REMOVE FORWARD CLUTCH PISTON
a. Place the forward clutch drum onto the O/D support.
b. Hold the forward clutch piston with hand, apply compressed air to the O/D support to remove the forward clutch piston.
c. Remove the forward clutch piston.
d. Remove the 2 O-rings from the piston.





8. REMOVE 0-RING FROM FORWARD CLUTCH DRUM
9. REMOVE 3 OIL SEAL RINGS

Forward Clutch Inspection


1. 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.





2. CHECK FORWARD CLUTCH PISTON
a. Check that the check ball is free by shaking the piston.
b. Check that the valve does not leak by applying low pressure compressed air.





3. CHECK FORWARD CLUTCH DRUM BUSHING
Using a dial indicator, measure the inside diameter of the forward clutch drum bushing.

Maximum inside diameter: 24.08 mm (0.9480 inch)

If the inside diameter is greater than the maximum, replace the forward clutch drum.


Forward Clutch Assembly
1. INSTALL OIL SEAL RINGS
a. Coat 3 oil seal rings with ATF.



b. Install the 3 oil seal rings to the forward clutch drum groove, then settle them down by squeezing their ends together.

NOTICE: Do not squeezed the ring ends more than necessary.

HINT: After installing the oil seal rings, check that they rotate smoothly.





2. INSTALL NEW O-RING TO FORWARD CLUTCH DRUM
Coat a now O-ring with ATF and install it on the forward clutch drum.

3. INSTALL FORWARD CLUTCH PISTON
a. Coat new O-rings with ATF and install them on the forward clutch piston with a screwdriver.





b. Being careful not to damage the O-rings, press the clutch piston into the forward clutch drum with both hands.





4. 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 snap ring expander. Be sure the end gap of the snap ring is not aligned with the spring retainer claw.





5. INSTALL CUSHION PLATE ROUNDED END DOWN, AS SHOWN
6. INSTALL PLATES, DISCS AND FLANGE




a. Install in order: P = Plate D = Disc
P-D-P-D-P-D-P-D-P-D-P-D

b. And then install the flange, the rounded edge facing downward.

HINT: There are 8 different thicknesses for the flange.

Flange thickness








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 forward clutch drum.





7. CHECK PACK CLEARANCE OF FORWARD CLUTCH Using SST and a dial indicator, measure the forward clutch piston stroke while applying and releasing compressed air (392-785 kPa, 4-8 kgf/cm', 57-114 psi).

Pack clearance: 0.60 - 1.00 mm (0.0236 - 0.0394 inch)

If the values are non-standard, inspect the discs.





8. INSTALL DIRECT CLUTCH TO FORWARD CLUTCH
a. Make sure that the thrust washer is installed to the direct clutch drum.
b. Align the flukes of discs in the direct clutch.
c. Install the direct clutch onto the forward clutch.





d. Check that the distance from the direct clutch end to the forward clutch and is 71.2 mm (2.803 inch).
If the distance is less than the above value, parts may have been assembled incorrectly, check and reassemble again