GMC 1989 Light Duty Truck, Repair Manual, Page: 823 / 998

180C AUTOMATIC TRANSMISSION 7A3-15
Figure 4 3 Exploded V i e w - V alves in Oil P um p
1. R E T A I N I N G PIN
2. C O N V E R T E R C L U T C H C O N T R O L V A L V E PLUG
3. S P RING
4. C O N V E R T E R C L U T C H C O N T R O L V A L V E
5. O I L PUMP
6. O I L PUMP S E A L R IN G (2 R E Q U I R E D )
7. P RESS URE R E G U L A T O R V A L V E
8. S P R IN G S EATS
9. S P RING
10. R E V . BOOST V A L V E
11. R E V . BOOST V A L V E S L E E V E
12. R E T A I N I N G PIN
H-180C-50
H-180C-52
R E V E R S E C L U T C H PIS TON
R E V E R S E C L U T C H PISTO N IN N E R S E A L
R E V E R S E C L U T C H P IS TO N O U T E R S E A L
Figure 4 4 Reverse Clu tch Piston
G overnor Hub
Inspect (Figures 52 and 53)
• Seal rings for nicks, burrs, or damage.
• Governor hub oil screen.
• Governor hub splines for;
cracks
chipped teeth
*
1.
Assemble
Oil screen flush with the governor hub.
2. Seal rings if necessary.
3. Governor hub.
4. Snap ring.
G overnor Body and S peedom eter D rive G ear
Disassemble
*
1. Secondary valve spring retainer.
2. Secondary valve spring, secondary valve, and the
primary valve.
Figure 4 5 C o m p re ss in g Reverse Clutch Piston R etainer
1
.
2
.
3.
R E V E R S E C L U T C H PISTO N
O I L PUMP
C O N V E R T E R H O U S IN G
H-180C-49