Chevrolet 10 Series 1970 Service Manual page 216

REAR SUSPENSION AND DRIVE LINE 4-40
F ig . 75—S peedom eter C o n tro l S w itc h
SPEEDOMETER ADAPTER CONTROL SWITCH
Replacement
1. R em ove tran sm ission
m ove the two s cre w s
transm ission shift le v e r .
switch housing to rubber case and slid e switch hous­
ing fro m rubber case.
2. Rem ove two s c rew s retaining adapter control switch
to switch housing and disconnect e le c tr ic a l leads
fro m switch (fig . 75).
3. Connect e le c tr ic a l leads to new switch, position and
secure adapter con trol switch to switch housing with
retaining screw s.
4. R ein stall switch housing to rubber case and secure
with pin. Secure switch
transm ission sh ift le v e r
" Vacuum Shift Unit C ontrol Switch R ep la cem en t".
5. T es t operation o f shift system .
General D e s crip tio n ..............................................................................
Maintenance and A d ju stm e n ts ............................................................
Com ponent Part R e p la ce m e n t.................. ..........................................
A x le A s s e m b ly ..................................................................................
Rem oval . .......................................................................................
M odels 17121 and 17101 (18,500 lb.) use identical d if­
fe re n tia l head assem b lies, the only d ifferen ce being the
s iz e o f the ring and pinion g e a r (fig . 76).
M odel 19101 (23,000 lb .) axle is s im ila r to that of
M odel 17121 and 17101 see F igu re 76 except that many
components are increased in s iz e to obtain a g re a te r
capacity rating.
S erv ic e operations are the same on 18,500 and 23,000
lb. axles. R e fe r to the Specifications Section o f this
Manual fo r bolt torque and gen eral axle inform ation
pertaining to the d ifferen t m odels.
DRIVE P IN IO N A N D CAGE
Both axles are equipped with a straddle mounted d rive
pinion. Pinion bearings are o f the opposed tapered r o lle r
shift le v e r knob, then r e ­
retaining switch housing to
Rem ove pin that retains
housing rubber case to
as sp ecified in Step 5 of
DRIVE LINE
REAR AXLE (EATON) SINGLE SPEED
GENERAL DESCRIPTION
V A C U U M SHIFT CONTROL SWITCH
HO U SIN G OR CASE
Replacement
1. Rem ove the two screw s securing the axle shift con­
tro l va lve
bracket.
NOTE: Do not disconnect con trol va lv e v a c ­
uum, atm osphere o r a ir clea n er lin es.
2. T ilt o r slid e the control va lve as requ ired to obtain
access to cable retaining sc re w and disconnect cable
fro m v a lve.
3. Withdraw cable fro m
fro m switch housing on transm ission shift le v e r.
4. R em ove the transm ission shift le v e r knob, then r e ­
m ove the two screw s retaining switch housing case to
transm ission le v e r.
e te r adapter switch to new housing.
5. L o o s e ly in sta ll the new switch housing case in ap­
p roxim ately the same position as the old housing,
and in stall control cable and knob assem bly by fe e d ­
ing end o f cable through switch housing and conduit.
6. Secure switch housing to transm ission le v e r as sp e­
cifie d in Step 5 of "V acuum Shift Unit Control Switch
R eplacem ent" .
7. Seat shoulder on control cable knob against housing,
then tighten set s crew to retain cable at the axle shift
control va lve, and in sta ll va lv e -to -b ra c k e t retaining
screw s.
8. T es t operation o f shift system .
INDEX
Page
4-40 Installation ....................................................................................
4-42
A x le V en t R e p la c e m e n t...................................................................
4-42 A x le Shaft Rem oval and R e p la c e m e n t..........................................
4-42
Hub and D r u m ..................................................................................
4-42 Drive Pinion Oil Seal
bearing type, and are a p ress fit on the d riv e pinion shaft.
A straight r o lle r type p ilot bearing is p ressed onto the
inner end o f the d rive pinion and seats in a machined bore
in the d ifferen tia l c a r r ie r .
D rive pinion bearing preload adjustment is controlled
by thickness of the bearing spacer installed between the
two tapered r o lle r bearings.
Shims between the pinion cage and c a r r ie r provid e a
means fo r adjusting pinion depth in the c a r r ie r to attain
c o r r e c t tooth contact between the ring gear and pinion.
DIFFERENTIAL
The d iffe re n tia l c a r r ie r assem bly may be rem oved,
while the axle is s till installed in the truck, a fte r the axle
shafts have been rem oved.
to the fra m e side m em ber
conduit by pulling sh ift knob
T ra n s fe r conduit and speedom ­
.......................................................................
CHEVROLET TRUCK SERVICE MANUAL
mounted
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