Rear Servo

TM 10-3930-633-34

in the actuating lever if they were previously

(2) Remove the servo piston retainer, servo

removed.

piston, and the return piston from the servo body.

It maybe necessary to tap the piston stem lightly

e. Installation.

with a soft-faced hammer to separate the piston

(1) To install the front servo, position the

retainer from the servo body.

front band forward in the case with the end of the

band facing downward. Make sure the front servo

(3) Remove all the seal rings, and remove the

spring from the servo body.

anchor pin is in position in the case web. Align the

c. Inspection.

large end of the servo strut with the servo ac-

(1) Inspect the servo bore for cracks and the

tuating lever, and align the small end with the

piston bore and the servo piston stem for scores.

band end.

Check fluid passages for obstructions. Replace

(2) Rotate the band, strut, and servo to align

seals that are damaged.

the anchor end of the band with the anchor in the

( 2 ) Check the actuating lever for free

case. Push the servo body onto the control valve

movement, and inspect it for wear. To replace the

body tubes.

actuating lever shaft, it will be necessary to press

(3) Install the attaching bolts and torque to

the shaft out of the bracket. The shaft is retained

3 0 3 5 ft/lbs.

in the body by serrations on one end of the shaft.

(4) Torque the control valve body attaching

These serrations cause a press fit at that end. To

bolts to 8 -- 10 ft/lbs. Check the clearance between

remove the shaft, press on the end opposite the

the manual valve and manual lever actuating pin

serrations. Inspect the adjusting screw threads

as given in paragraph 7-13.

and the threads in the lever.

(5) Adjust the front band.

(6) Install the vacuum diaphragm unit and

(3) Check the servo spring and servo band

strut for distortion.

rod.

(4) Inspect the servo band lining for ex-

(7) Install the fluid screen and pan, and fill

cessive wear and bonding to the metal. The band

the transmission with fluid.

should be replaced if worn to a point where the

( 8 ) Adjust the downshift and manual

grooves are not clearly evident.

linkage.

(5) Inspect the band ends for cracks and

7-15. Rear Servo

check the band for distortion.

a. Removal.

d. Assembly.

(1) Drain the fluid from the transmission and

(1) Lubricate all parts of the front servo with

remove the pan and fluid screen.

transmission fluid to facilitate assembly.

(2) Remove the vacuum diaphragm unit.

(2) Install the inner and outer O-rings on the

(3) Remove the control valve body and the

piston retainer. Install a new O-ring on the return

two front servo tubes.

piston and on the servo piston (fig. 7-17).

(4) Remove the attaching bolts from the rear

(3) Position the servo piston release spring

servo; hold the actuating and anchor struts with

m the servo body. Install the servo piston,

the fingers, and remove the servo.

retainer, and return piston in the servo body as an

b. Disassembly.

assembly. Compress the assembly into the body,

(1) Remove the servo actuating lever shaft

and secure it with the snap ring. Make sure the

retaining pin with a 1/8-inch punch. See figure 7-

snap ring is fully seated in the groove.

18.

(4) Install the adjusting screw and locknut

7-21