Valve Body-Exploded View - Pontiac TRANS AM 1977 Service Manual

TURBO HYDRA-MATIC 250 TRANSMISSION 7A2-29
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D ~ T S N T VALVI
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1 9 D L T S N T V
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D E t t N T V
31 D t T e N T V
32 D E T C N I V
33 D t T E N T
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34 M T E W T V
35 D E T t N T V
1
1 M A N U A L V A L V E i I4 1 . 1 SHIFT V A L V €
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2 PRESSURE REGULATOR V A L V E I5 1.2 SHIFT C O N r l O L V A L V E
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3
CRtSSURE R C G U L A l O R V A L V E S P R I N G C 16 1 2 S H I F T C O N T R O L V A L V E S P R I N G
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REVERSE A N D M O D U L A T O R B O O S T V A L V E 17 1 . 2 S H I F l . C O N T R O L V A L V E SLEEVE
I N l E R M E D I A T E B O O S T VA!VE
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R E T A I N I N G P I N
6
B O O S T V A L V E SLEEVE
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1 9 M A N U A L L O W C O N T R O L V A L V E D
7 R E T A I N I N G P I N
10
M A N U A L L O W C O N T R O L V A L V E S P R I N G
8 1.3
SHIFT V A L V E
11 P L U G
9 1 3 SHIFT V A L V E S P R I N G 21 R E T A I N I N G P I N
10 1 3 SHIFT CONTROL
V A L V E
13 D E l t N T R E G U L A T O R V A L V E
I 1 2.3 SHIFT C O N T R O L V A L V E S P R I N G 14 D E T E N T R E G U L A T O R V A L V E S P R I N G SEAT
12
2
3 SHIFT C O N T R O L V A L V E SLEEVE 15 O E r t N T R Z G U L A T O R V A L V E S P R I N G
13 R E T A I N I N G P I N
36 R t T A I N I f i G P I N
36 R E T A I N I N O I O L T
37 R C T A I M I N O P t N
38
CAP
Fig. 7A2-59 Valve Body
-
Exploded View
2. In lower right hand bore, install pressure regulator
valve, spring, reverse and modulator boost valve,
intermediate boost valve, boost valve sleeve and retaining pin.
3. In next bore up, install 2-3 shift valve, shift valve
spring, 2-3 shift control valve, spring, sleeve and retaining
pin.
4. In next bore up, install 1-2 shift valve, 1-2 shift control
valve, control valve spring, control valve sleeve and retaining
pin.
5. In the next bore up, install manual low control valve,
spring, plug and retaining pin.
6. In top right hand bore, install detent regulator valve,
spring seat, spring and retaining pin.
OIL PUMP (FIG. 7A2-60)
Disassembly
1. Place pump cover and starter shaft assembly through
hole in bench.
2. Remove pump cover to body attaching bolts (Fig.
7A2-61).
3. Remove two (2) forward clutch to pump hub hook-
type oil seal rings and three (3) direct clutch to pump hook-
hub type oil rings (Fig. 7A2-62).
4. Remove pump cover to direct clutch drum housing
selective thrust washer.
5. Remove pump cover and stator shaft assembly from
pump body (Fig. 7A2-63).
6. Mark drive and driven gears for reassembly in same
position and remove gears from pump body.
7. Remove pump outside diameter to case (square cut)
"0" ring seal. Discard seal.
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I O M P Y L Y N V I R I U
nu8 LIP S t A l
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S Q U A R E C U T
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R I N G SCAL
D I R E C I CLIJTCH T O P U M P
HUB 110Ok
TYI'F 011
X A L R I N G S 3
FIG. 7A2-60 OIL PUMP ASSEMBLY
-
EXPLODED VIEW
l nspection
1. Wash all parts in cleaning solvent and blow out all
oil passages. D O NOT USE RAGS T O DRY PARTS.
CAUTION: Some solvents may be harmful to
rubber seals.
2. Inspect pump gears for nicks or damage.
3. Inspect body and cover faces for nicks or scoring.
Inspect cover hub O.D. for nicks or burrs which might
damage clutch drum bushing journal.
4. Inspect body bushing for galling or scoring. Check
clearance between body bushing and converter pump hub.
Maximum clearance is ,005". If bushing is damaged, oil pump
body should be replaced.
5. Inspect converter housing hub O.D. for nicks or burrs
which might damage pump seal or bushing. Repair or replace
as necessary.
6. If hub lip seal is damaged or is leaking (and pump
body is otherwise suitable for reuse), replace seal.
7. With parts clean and dry, place pump gears in pump
body and check pump body face to gear face clearance.