Chevrolet 10 Series 1970, Service Manual

Page: 575 / 671

ELECTRICAL—BODY AND CHASSIS 12-13
SPEEDOMETER REPLACEMENT
NOTE: S ervicin g of the speedom eter assem bly
should be p erfo rm ed by an authorized AC Speed­
o m eter S e rv ic e Station.
Conventional Cab M odels
1. Rem ove instrum ent clu ster assem bly and lam inated
c irc u it as p revio u sly d escrib ed in this section.
2. R em ove retaining screw s and clu ster re a r c o v e r.
3. R em ove fron t c o v e r fro m face o f clu ster.
4. Rem ove two retaining screw s and speedom eter fro m
clu ster.
5. To in stall, r e v e r s e rem ova l procedu re and check op­
eration o f unit. DO N O T K IN K C A B L E HOUSING.
Flatface Cow l M odels
1. D isconnect b attery ground cable.
2. Disconnect speedom eter cable and a ll indicator and
illum inating sockets.
3. R em ove three s crew s attaching speedom eter housing
to dash panel.
4. P u ll speedom eter fro m opening in dash panel.
5. To in stall, r e v e r s e rem o va l procedu re and check
operation o f unit. DO N O T K IN K C A B L E HOUSING.
P M odels
1. R em ove instrum ent clu ster assem bly as p revio u sly
d escrib ed in this section.
2. R em ove four s c re w s secu rin g clu ster back panel to
b e z e l assem bly.
3. Rem ove two s c re w s secu rin g speedom eter head to
c lu ster back panel; ca re fu lly rem ove speedom eter
head.
NOTE:
A ssem b le the two parts with alignm ent
dow els p ro p e rly positioned.
4. To in stall, r e v e r s e rem o va l procedu re and check
operation o f unit. DO N O T K IN K C A B L E HOUSING.
Tilt Cab M odels
1. R em ove instrum ent clu ster assem bly as p reviou sly
describ ed in this section.
2. R em ove eight s c rew s secu rin g clu ster b e ze l to back
panel assem bly and rem o ve b ezel.
3. R em ove two s c re w s attaching speedom eter head to
back panel assem bly and c a re fu lly rem ove speedom ­
e te r head.
4. To in stall, r e v e r s e rem o va l p rocedu re and check
operation o f unit. DO N O T K IN K C A B L E HOUSING.
SPEEDOMETER CABLE REPLACEMENT OR
LUBRICATION; ALL MODELS ‘
1. D isconnect speedom eter cable fro m the oversp eed
switch on T ilt Cab M od els, speedom eter head on
other m odels.
2. R em ove old cable by pulling it out fro m speedom eter
end o f conduit.
NOTE: I f old cable is broken it w ill be n ec­
es s a ry to rem ove lo w e r p iece fro m transm ission
end of conduit.
3. Lu bricate the lo w e r 3/4 length o f cable with sp eed ­
o m eter c a tle lubricant and feed the cable into the
conduit. DO N O T K IN K SPEEDO C A B L E HOUSING.
4. Connect the upper end o f cable to the sp eed om eter
head, o r o versp eed switch, and road test the truck
fo r p ro p er sp eed om eter-od om eter operation.
FUEL GAUGE REPLACEMENT
1 0 -6 0 Conventional Cab M odels (Figs. 9, 12)
1. Rem ove instrum ent clu ster assem bly as p revio u sly
d escrib ed in this section.
2. R em ove instrum ent lam ps, ground screw s and te r m i­
nal nuts retaining lam inated c ircu it to fuel gauge
section of clu ster assem bly.
3. C a refu lly m ove the lam inated circu it fro m fuel gauge
area and rem ove three retaining screw s, c o v e r and
gauge assem bly fro m clu ster housing.
4. Rem ove attaching nuts and gauge fro m c o v e r plate.
5. To in stall, re v e r s e rem o va l procedu re and check
operation o f unit.
Flatface Cow l M odels (Fig. 10)
1. Rem ove instrum ent clu ster assem bly as p revio u sly
d escrib ed in this section.
2. Uncrim p b e z e l (7 p la ces) and rem ove b ezel.
3. Rem ove nuts securing fuel gauge to clu ster case and
rem ove gauge.
4. To in sta ll, r e v e r s e rem oval procedu re and check
operation o f unit.
Tilt Cab M odels
1. Rem ove instrum ent clu ster as p reviou sly d escrib ed
in this section.
2. Rem ove eight screw s securing clu ster b e z e l to back
panel assem bly and rem ove b ezel.
3. Pu ll o ff p lastic caps on term inal nuts and rem ove
term in al nuts; c a re fu lly rem ove fuel gauge.
4. To in stall, r e v e r s e rem ova l procedu re and check
operation o f unit.
TEMPERATURE IN D IC A TO R LIGHT
1 0 -3 0 Conventional Cab M odels
The tem perature indicator circu it consists o f two r e ­
m otely located units, in dicator light and sender unit. The
lamp unit is a sin gle red ligh t which indicates an o v e r ­
heated engine condition.
TEMPERATURE GAUGE REPLACEMENT
4 0 -6 0 Conventional Cab M odels (Figs. 9, 12)
1. R em ove instrum ent clu ster assem bly as p revio u sly
d escrib ed in this section.
2. Rem ove term in al nuts retaining lam inated c irc u it to
gauge unit.
3. Rem ove three attaching screw s, co v e r and gauge a s ­
sem bly fro m clu ster housing.
4. R em ove term in a l attaching nuts and gauge unit fro m
c o v e r plate.
5. To in stall, r e v e r s e rem o va l procedu re and check
operation o f unit.
CHEVROLET TRUCK SERVICE MANUAL