INSTRUMENT CLUSTER REMOVAL AND DISASSEMBLY.

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

(8)

Release brush springs and remove from

nuts and washers securing hourmeter to instrument

brush arms.

cluster. Disconnect leads at back of instrument and

remove hourmeter from instrument housing.

The

(9)

Remove brush arms with brackets.

hourmeter is not subject to disassembly.

(10) Remove woodruff key from armature shaft.

6-51.

INSTRUMENT CLUSTER REMOVAL AND

DISASSEMBLY.

(11) Remove collar from armature shaft.

a. Remove two screws and washers from underside

(12) Remove drive end frame from armature

of instrument housing.

shaft.

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.

testing.

6-52. ENGINE ELECTRICAL SYSTEM.

d. Inspection, Testing, and Repair.

6-53.

GENERATOR.

This paragraph contains

(1) Armature.

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

5-66.

(b) Using lamp and two probes, test armature for

ground. Place one probe on commutator and the other

b. Disassembly.

probe on the laminated core. If test lamp lights,

armature is grounded. Replace it.

(1) Remove nut and lockwasher from drive end

of shaft.

circuit is discovered, clean between all bars of

(2) Remove generator pulley and fan from

commutator; then retest. If open circuit is indicated,

armature shaft.

replace armature.

(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,

(4)

Remove

commutator

end

frame

from

cuts, and noises due to wear. Replace defective bearing

housing.

as authorized.

(5) Separate generator housing from drive end