Figure 7-41. Installing output clutch piston return spring.

TM 9-2520-249-34& P

c. Place a flat, smooth plate (approximately 7

x 7 inches) on the clutch plates as shown in figure 7-40.

d. Apply a press force of 600 to 2,000 pounds

on the clutch group as shown in figure 7-40, and

measure and record dimension B.

e. With a micrometer. measure the thickness

of the snapring which retains the output clutch piston

housing. Record this as dimension C.

Substitute the three dimensions recorded

for the letters in the formula A (B + C)=clutch clearance.

If the clearance is between 0.070 and 0.090 inch, the

clutch may be assembled from the parts at hand. If the

clearance is greater than 0.090 inch, select a thicker

piston (28, FO-7 or 104, FO-8). If the clearance is less

than 0.070 inch, select a thinner piston.

NOTE

The exact thickness of the piston is etched

on the piston.

Figure 7-42. Installing output clutch plates.

g. With

the

proper

clutch

clearance

established, assemble the clutch as outlined below.

k. Install, alternately, seven internal-splined

h. Install the ball bearing into the clutch

and seven external-tanged clutch plates. beginning with

housing and retain it with the snapring (fig. 7-41).

an internal-splined plate (fig. 7-42).

Install the expander and piston outer

sealring onto the piston as outlined in paragraph 7-55.

m. Install the piston, larger diameter first, into

the clutch housing. Make certain that all of the springs

seat in the counterbored spring pockets in the clutch

piston (fig. 7-43). Shaking the piston will help seat the

springs.

Figure 7-41. Installing output clutch piston return spring.

Install eight clutch anchor pins, 16 spring

guide pins and 16 springs (fig. 7-41).

Install the clutch hub, shorter side of hub

Figure 7-43. Installing output clutch piston.

7-35