GMC 4000 Series Service Manual page 431

Sec. 6Y
Page 420
A/C GENERATING SYSTEM
Figure 15— Adjusting Voltage Setting (TypicalI
procedures will vary accordingly. The removal and
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.
GENERATOR REMOVAL
1. Disconnect negative battery cable from the
battery.
CAUTION: It is important that bat­
tery negative terminal be disconnected,
since generator will be damaged if wiring
or terminals are accidentally shorted or
grounded while being disconnected.
2. On 42-, 61-, and 62-amp generators, de­
p ress lock on connector and pull connector out of
G M C S E R V I C E M A N U A L
socket on generator. Pull rubber boot off "BAT"
terminal and remove terminal nut. Disconnect wire
from "GRD" terminal and remove the wiring clip.
ers from harness leads at generator terminals.
Remove harness clip from generator, then pull
leads from terminals.
erator to mounting bracket bolts; then move gen­
erator to loosen the drive belt or belts. Remove
generator drive belt or belts.
erator to mounting bracket bolts; then remove
generator.
GENERATOR BRUSH REPLACEMENT
(MODEL 1117754)
130-amp generator models requires partial dis­
assembly of the generator and is considered apart
of the unit overhaul procedure.
Removal (Fig. 16)
and remove cover.
to blade connector post and disconnect lead from
post.
and brush holder to rear end frame.
generator. Leave condenser with generator to
avoid excessive strain on lead wire.
springs from generator end frame.
Installation (Fig. 16)
holder and insert a pin through hole in brush holder
and brushes to retain in position.
frame, then secure brush and condenser leads to
terminals as shown in figure 16.
tighten firmly.
to be sure all leads are properly connected. Install
cover over brush holder.
GENERATOR INSTALLATION
is disconnected from battery. Failure to discon­
nect the negative battery cable may result in dam­
age to generator.
install adjusting arm. Tighten flange-type lock nuts
securely.
pulley and adjust belt tension as explained under
On 130-amp generator, remove nuts and wash­
3. Loosen adjusting arm pivot bolt and gen­
4. Remove adjusting arm pivot bolt and gen­
NOTE: Brush replacement on 42-, 61-, and
1. Remove screws from brush holder cover
2. Remove nut retaining indicator light wire
3. Remove two screws which attach condenser
NOTE: Condenser lead is connected inside the
4. Remove brush holder, brushes, and brush
1. Position brush springs and brushes in brush
2. Position brush holder and brushes in end
3. Install brush holder mounting screw s and
4. Remove pin from brush holder and check
IMPORTANT: Be sure negative battery cable
1. Attach generator to mounting bracket and
2. Place drive belt(s) over generator drive