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7A4-40
1977 PONTIAC SERVICE MANUAL
RETAINING
"E"
RlNG
ACCUMULATOR PISTON
OIL SEAL RlNG
SPRING RETAINER
Fig. 7A4-70 Rear Servo
-
Exploded View
Assemble Rear Servo
1. Install spring retainer, spring and washer on band
apply pin.
2. Install band apply (servo) pin, retainer, spring and
washer into bore of servo piston and secure with E-ring.
3. Install oil seal on servo piston, if removed.
4. Install outer and inner oil rings on accumulator
piston, if removed, and assemble into bore of servo piston.
CONTROL VALVE ASSEMBLY
Disassemble
1. Position control valve assembly with cored face up and
accumulator pocket toward operator.
2. Remove manual valve from upper bore.
3. Install Compressor J 21885 on accumulator piston
valve, remove retaining ring (Fig. 7A4-7 1) and remove front
accumulator piston and spring (Fig. 7A4-72).
4. From the top right hand bore, remove retaining pin,
1-2 modulator bushing, 1-2 regulator valve, 1-2 regulator
spring, 1-2 detent valve and 1-2 shift valve (Fig. 7A4-73).
5. From next bore down, remove retaining pin, 2-3
primary spring, modulator valve bushing, 2-3 modulator
valve, 2-3 secondary spring and 2-3 shift valve.
6. From next bore down, remove retaining pin, bore
plug, 3-2 valve spring, spacer and 3-2 valve.
7. At other end of assembly, top bore, remove retaining
pin and bore plug, detent valve, detent regulator valve, spring
and spacer.
Fig. 7A4-7 1 Compressing Accumulator Piston and Spring
8. From next bore down, on models PB, PC and PD
remove -the grooved retaining pin, bore plug, 1-2 accumulator
valve and the 1-2 accumulator primary spring.
On model OC, remove the grooved retaining pin, bore
plug and the 1-2 accumulator valve.
On models PA and OB, remove the grooved retaining
pin, bore plug, 1-2 accumulator secondary spring and the 1-2
accumulator valve.
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