Figure 7-17. Front Servo.

TM 10-3930-633-34

(11) Install the inhibitor valve spring and

assembly by tapping it gently with a soft ham-

valve in the lower body.

mer.

(7) Install the compensator pressure tube to

(12) Install the 1-2 shift valve spring and

the pressure regulator and the control valve body.

valve. Install the lower body side plate.

(8) Turn the manual valve one full turn in

(13) Install the compensator cutback valve

each manual lever detent position. If the manual

in the upper body. Install the upper body rear

valve binds against the actuating pin in any

plate.

detent position, loosen the valve body attaching

(14) Install the downshift valve and spring

bolts and move the body away from the center of

in the body.

the case. Move the valve body only enough to

(15) Install the throttle boost valve and

relieve the binding. Torque the attaching bolts

spring. Install the throttle boost short valve and

and ret-heck the manual valve for binding.

sleeve.

(9) Position the pushrod in the bore of the

(16) Install the compensator valve, inner

vacuum diaphragm unit, Using the diaphragm

and outer compensator springs, and the com-

unit as a guide, insert the pushrod into the

pensator sleeve and plug.

t h r e a d e d opening of the case. Torque the

(17) Position the front plate. Apply pressure

diaphragm unit to 1523 ft/lbs. Connect the

to the plate while installing the two attaching

screws.

vacuum hone.

(10) Torque the front servo attaching bolts

(18) Install the throttle valve, plug and

check valve in the throttle valve body, Position

to 3035 ft/lbs.

(11 ) Adjust the front band (paragraph 7-5).

the separator on the upper body and install the

throttle valve body. Install the three attaching

(12) Install the fluid screen and the screen

retaining clip.

screws.

(19) Install four screws attaching the cover

(13) Position a new pan gasket on the

to the lower body, two screws attaching the

bottom of the transmission case, and install the

separator plate to the upper body, and one screw

pan. Torque the pan screws to 1013 ft/lbs.

attaching the separator plate to lower body.

(14) Adjust the rear band (para 7-5).

Torque the cover and body screws to 20 30

7-14. Front Servo

in./lbs.

a. Removal.

(20) Install the manual valve.

(1) Drain the fluid from the transmission,

e. Installation.

and remove the pan and fluid screen.

(1) Before installing the control valve body,

(2) Remove the vacuum diaphragm unit.

check for a bent manual valve by rolling it on a

(3) Loosen the three control valve body

flat surface,

attaching bolts.

(2) Install the control valve body by aligning

(4) Remove the attaching bolts from the

the front servo tubes with the, holes in the valve

front servo (fig, 7-14). Hold the strut with the

body. Shift the manual lever to the 1 detent, and

fingers and remove the servo.

place the inner downshift lever between the

b. Disassembly.

downshift lever stop and the downshift valve. The

(1) Refer to figure 7-17 and remove the servo

manual valve must engage the actuating pin in

piston retainer snap ring. Apply pressure to the

the manual detent lever.

piston when removing the snap ring.

(3) Install but do not tighten the control

valve body attaching bolts.

(4) Move the control valve body toward the

center of the case until the clearance is less than

0,050 inch, between the manual valve and the

actuating pin on the manual detent lever.

(5) Torque t h e attaching bolts to

specification. Be sure that the rear fluid screen

retaining clip is installed under the valve body as

shown in figure 7-14.

(6) Install the main pressure oil tube. Be

sure to install the end of the tube that connects to

the pressure regulator first. Then, install the

other end of the tube into the main control valve

Figure 7-17. Front Servo.

7-20