frame, and withdraw armature from housing.
6-49. HORN REMOVAL. Disconnect electrical leads
(6) Remove brush lead attaching screw and
from horn. Remove two screws, nuts and washers
lockwasher 'from brush lead.
retaining horn. Remove horn from truck. The horn is not
subject to disassembly.
(7) Lift brush arms and remove brushes.
6-50. ENGINE HOURMETER REMOVAL. Remove two
Release brush springs and remove from
nuts and washers securing hourmeter to instrument
cluster. Disconnect leads at back of instrument and
remove hourmeter from instrument housing.
Remove brush arms with brackets.
hourmeter is not subject to disassembly.
(10) Remove woodruff key from armature shaft.
INSTRUMENT CLUSTER REMOVAL AND
(11) Remove collar from armature shaft.
a. Remove two screws and washers from underside
(12) Remove drive end frame from armature
of instrument housing.
b. Raise instrument cluster from housing to extent
(13) Remove screws and washers from drive
permitted by attached leads.
end frame, and remove bearing retainer, gasket, washer
and bearing from drive end frame.
c. Remove screws holding back on instrument
cluster and remove back.
(14) Press bearing from commutator end frame.
d. Disconnect and tag leads at each instrument.
c. Cleaning. Using compressed air, and clean cloth,
Remove attaching nuts, washers and clamps at each
remove all dirt from component parts of generator before
instrument and remove individual instruments.
6-52. ENGINE ELECTRICAL SYSTEM.
d. Inspection, Testing, and Repair.
This paragraph contains
generator overhaul instructions. Do not attempt repairs
beyond these given in this paragraph. Make electrical
(a) Inspect commutator for burs, nicks, wear, and out
tests described with Generator and Regulator Tester,
of round (maximum allowable 0.001 inch). If either
Federal Stock Number 4910-509-1514 or equal, using
condition 'exists, place armature in lathe and turn down
the techniques given in the instructions which
commutator. Undercut mica 1/32 inch. Using No. 00
accompany the Tester.
sandpaper, remove all burs and roughness which lathe
tool leaves on commutator.
a. Removal and Installation. Refer to para 5-65 and
(b) Using lamp and two probes, test armature for
ground. Place one probe on commutator and the other
probe on the laminated core. If test lamp lights,
armature is grounded. Replace it.
(1) Remove nut and lockwasher from drive end
(c) Using growler, test armature circuits. If shorted
circuit is discovered, clean between all bars of
(2) Remove generator pulley and fan from
commutator; then retest. If open circuit is indicated,
(3) Remove bolts and lockwashers from housing
(d) Replace defective items as authorized.
and remove drive end frame.
(2) Ball bearing. Inspect ball bearing for nicks,
cuts, and noises due to wear. Replace defective bearing
(5) Separate generator housing from drive end