Chevrolet 10 Series 1970 Service Manual page 210

REAR SUSPENSION AND DRIVE LINE 4-34
SPEEDOMETER
ADAPTER
IGNITION
SWITCH
r R E D - '
(T O T E M P . P IN K )
CIRCU IT BREAKER
B LACK
Fig. 61 — E le c tric S h ift C o n tro l System W irin g D iagram and S h ift U n it D e ta ils
1. M o to r A tta c h in g Screw
2. C a b le C lip
3. M o to r Assembly
4 . M o to r C over G aske t
5. S h ift Housing
6. Bushing
7. In s u la to r
A th erm al type c ircu it b rea k er installed on the front of
the dash panel p ro vid es p rotection in case o f a short c i r ­
cuit in the e le c tric shift system during veh icle operation.
Should a short circ u it occur the b rea k er w ill in term it­
tently d e -e n e rg ize the c irc u it until the trouble has been
c o rre c te d .
T h re e w ire s in the shift main harness (fig . 61) are
connected to the control switch. The red w ire connects
the battery (thru the ignition switch and circu it b rea k er)
to the control switch. The white w ire connects the con­
t r o l switch (thru the autom atic switch) to one fie ld o f the
a xle shift unit m otor. The black lead connects the con­
tr o l switch (thru the autom atic switch) to the other field
A C C ESSO RY
T E R M IN A L
MANUAL
CONTROL
SWITCH
R IB B E D ,
f—
a —
C O N N E C T O R
AUTOMATIC
SWITCH
9. Jam N u t
10. Bearing Assem bly
11. Lock N u t
12. Bearing C o ve r
G aske t
13. Bearing C o ve r
14. Screw
15. A c tu a tin g Lever S haft
16. A c tu a tin g Lever
17. Torsion Spring
18. S pring W in d in g Lever
19. C o v e r G a ske t
20. Front C over
21. F ille r Plug
o f the axle shift unit m otor and also connects the speed­
om ete r adapter.
O peration
The operation o f the units in each speed range is e x ­
plained in the follow in g paragraphs.
High Speed Range
When the control switch operating arm is m oved to the
up (HI) position, current is supplied to one fie ld o f the
m otor in the axle shift unit. T h is current turns the a r ­
m ature and the d rive screw in a clockw ise d irection and
m oves the nut toward the bottom of the screw (fig. 64).
22 . C o ve r Screw
23. D riv e Screw Assem bly
24. C o n ta c t Bumper
25. T e rm ina l N u t
26. S w itch Screw
27. S w itch Assem bly
28. S w itch G a ske t
CHEVROLET TRUCK SERVICE MANUAL