Chevrolet 70 1969 Series, Shop Manual

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ENGINE ELECTRICAL 6Y-27
TERMINAL A N D N U T -
ASSEM BLY
B R U SH H O L D E R G R O U N D C O N D E N S E R
M O U N T I N G S C R E W ST U D L E A D
t
-2958
Figure 11—Generator Brush Replacement
(Model I I 1 7754) (Typical)
installation instructions given following are in­
tended only as a guide. Additional operations will
be required on some vehicles to remove other
equipment to permit access to generator, belts,
and/or brackets.
G E N E R A T O R R E M O V A L
1. Disconnect negative battery cable from
battery.
C A U T IO N : It is important that bat­
tery negative term inal be disconnected,
since generator will be damaged if w iring
o r term inals are accidentally shorted or
grounded while being disconnected.
2. On generator Models 1100842, 1100849, and
1117754, depress lock on connector and pull con­
nector out of socket on generator. Pull rubber boot
off " B A T " terminal and remove terminal nut. Dis­
connect wire from " G R D " terminal and remove
wiring clip.
On other generator model, remove nuts and
washers from harness leads at generator term­
inals. Remove harness clip from generator, then
pull leads from terminals.
3. Loosen adjusting arm pivot bolt and gener­
ator to mounting bracket bolts. Move generator to
loosen drive belt(s) and remove from generator
pulley.
4.-Remove adjusting arm pivot bolt and gen­
erator to mounting bracket bolts; then remove
generator.
G E N E R A T O R IN S T A L L A T IO N
I M P O R T A N T : Be sure negative battery cable
is disconnected from battery. Failure to discon­
nect the negative battery cable may result in dam­
age to generator.
1. Attach generator to mounting bracket and
install adjusting arm pivot bolt.
2. Place drive belt(s) over generator drive
pulley and adjust belt tension as explained under
"Drive Belt Tension Adjustment" previously. Tight­
en flange type lock nuts and mounting bolts to
torque recommended in "Specifications” at end of
this section.
3. On 42-, 61-, or 62-amp generators, push
the wiring harness connector into socket, making
sure lock on connector engages end frame. Place
harness clip on ground terminal marked " G R D ”
and connect ground wire to terminal.
4. Attach red wire to " B A T ” terminal on gen­
erator and fit boot over terminal.
5. Perform "Generator Output Test" described
previously to determine if generator is operating
properly and that regulator is correctly adjusted.
GENERATOR BRUSH REPLACEMENT
N O T E : Brush replacement on 42- and 61-
amp generator models requires partial disassem­
bly of the generator and is considered a part of
the unit overhaul procedure.
G E N E R A T O R BR U SH R E P L A C E M E N T
(M O D E L 1117754) (Fig. 11)
1. Remove screws from brush holder cover
and remove cover.
2. Remove nut retaining indicator light wire
to connector and disconnect lead from post.
3. Remove two screws which attach condenser
and brush holder to rear end frame.
N O T E : Condenser lead is connected inside the
generator. Leave condenser with generator to
avoid excessive strain on lead wire.
4. Remove brush holder, brushes, and brush
springs from generator end frame.
5. Position brush springs and brushes in
brush holder and insert a pin through hole in brush
holder and brushes to retain in position.
6. Position brush holder and brushes in end
frame, then secure brush and condenser leads to
terminals as shown in figure 11.
7. Install brush holder mounting screws and
tighten firmly.
8. Remove pin from brush holder and check
to be sure all leads are properly connected. Install
cover over brush holder.
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK S H O P M A N U A L