Clutch Drum and Input Shaft Assembly

A750F AUTOMATIC TRANSMISSION: CLUTCH DRUM AND INPUT SHAFT ASSEMBLY:

INSPECTION

1. INSPECT REAR CLUTCH DISC

(a) Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt, 2) the lining of a disc is peeled off or discolored, or 3) grooves or printed numbers have even a little bit of damage.
NOTE: Before assembling new discs, soak them in ATF for at least 15 minutes.

2. INSPECT REVERSE CLUTCH HUB SUB-ASSEMBLY

(a) Using a dial indicator, measure the inside diameter of the reverse clutch hub bushing.
Standard drum bushing:
35.812 to 35.837 mm (1.4099 to 1.4109 in.)
Maximum drum bushing:
35.887 mm (1.4129 in.)
If the inside diameter is greater than the maximum, replace the reverse clutch hub.

3. INSPECT FORWARD CLUTCH HUB SUB-ASSEMBLY

(a) Using a dial indicator, measure the inside diameter of the forward clutch hub bushing.
Standard drum bushing:
26.037 to 26. 062 mm (1.0251 to 1.0261 in.)
Maximum drum bushing:
26.112 mm (1.0280 in.)
If the inside diameter is greater than the maximum, replace the forward clutch hub.

4. INSPECT FORWARD MULTIPLE DISC CLUTCH DISC

(a) Using a vernier caliper, measure the free length of the spring together with the spring seat.
Standard free length:
26.74 mm (1.053 in.)
6. INSPECT DIRECT CLUTCH DISK

(a) Using a vernier caliper, measure the free length of the spring together with the spring seat.
Standard free length:
21.04 mm (0.828 in.)
8. INSPECT DIRECT CLUTCH RETURN SPRING SUB-ASSEMBLY

(a) Using a vernier caliper, measure the free length of the spring together with the spring seat.
Standard free length:
19.51 mm (0.768 in.)
9. INSPECT PACK CLEARANCE OF DIRECT CLUTCH

(a) Using a dial indicator, measure the moving distance (distance A) of the clutch flange at both ends across a diameter while blowing air from the oil hole as shown in the illustration, and calculate the average.
Pack clearance:
0.5 to 0.8 mm (0.020 to 0.031 in.)
NOTE: Install a selective flange (3.4 mm (0.134 in.)) when measuring the moving distance (shaded area in the illustration.)
HINT: Flange moving distance A = 0.26 to 1.14 mm (0.010 to 0.045 in.)
Pack clearance = Flange moving distance A - 0.05 mm (0.002 in.)

(b) If the pack clearance is outside the standard, select and install a clutch flange that makes the pack clearance within the standard.
Standard flange thickness:

10. INSPECT PACK CLEARANCE OF REVERSE CLUTCH
(a) Using a dial indicator, measure the reverse clutch piston stroke (distance A) and the moving distance (distance B) of the reverse flange at the both ends across a diameter while blowing air (392 kPa, 4 kgf/cm2, 57 psi) from the oil hole as shown in the illustration, and calculate the average.
Pack clearance:
0.5 to 0.8 mm (0.020 to 0.031 in.)
NOTE: Install a selective flange (3.3 mm (0.130 in.)) when measuring the moving distance (shaded area in the illustration.)
HINT: Piston stroke A = 1.05 to 2.15 mm (0.041 to 0.085 in.)
Flange moving distance B = 0.72 to 1.08 mm (0.029 to 0.043 in.)
Pack clearance = Piston stroke A to Flange moving distance B to 0.06 mm (0.002 in.)

(b) If the pack clearance is outside the standard, select and install a clutch flange that makes the pack clearance within the standard.
Standard flange thickness:

11. INSPECT PACK CLEARANCE OF FORWARD CLUTCH

(a) Using a dial indicator, measure the moving distance (distance A) of the clutch flange at both end across a diameter while blowing air from the oil hole as shown in the illustration, and calculate the average.
Standard pack clearance:
0.6 to 0.9 mm (0.024 to 0.354 in.)
NOTE: Install a selective flange (3.4 mm (0.134 in.)) when measuring the moving distance (shaded area in the illustration.)
HINT: Flange moving distance A = 0.26 to 1.36 mm (0.010 to 0.054 in.)
Pack clearance = Flange moving distance A to 0.01 mm (0.0003 in.)

(b) If the pack clearance is outside the standard, select and install a clutch flange that makes the pack clearance within the standard.
Standard flange thickness: