Hourmeter - TM-10-3930-634-120065

TM 10-3930-634-12

WARNING

panel using two lockknuts. Reconnect electrical connec-

tions.

Disconnect battery ground cable from battery

before disconnecting any wiring under dash.

4-46. Panel Lights

4-43. Hourmeter

a. Removal. Refer to figure 4-28 for location of panel

lights. Disconnect electrical connector and remove two

a. Removal. Refer to figure 4-28 for location of hour-

mounting screws 10 remove panel lights from instru-

meter. Tag and disconnect electrical lead. Remove six

ment panel.

nuts, six screws and three lockwashers attaching hour-

b. Inspection Inspect the panel lights for loose con-

meter to instrument panel and remove hourmeter.

nections, defective wiring, and missing or burned out

b. Inspection and Testing

light bulbs. Replace defective lights.

(1) Inspect the hourmeter for broken glass and the

c. Installation. Use two screws to mount panel light

electrical wiring for cuts, breaks and deterioration.

on instrument panel. Connect electrical connector.

(2) Connect hourmeter to a power source and check

for proper operation by checking indicator above

4-47. Starter and Horn Push Button

odometer wheels. Indicator should revolve once per

Switches

minute.

a. Testing. Test for a defective switch by disconnect-

(3) Replace a defective hourmeter.

ing leads from switch to horn or starter, and connect-

c. Installation. Reinstall hourmeter in instrument

ing a test light between the switch terminals. Push the

panel using six screws, three lockwashers and six nuts

button. If the test light does not light, the switch is

Reconnect electrical lead.

defective.

4-44. Battery and Generator Indicator

b. Removal.

a. Removal. Refer to figure 4-28 for location of bat-

(1) Refer to figure 4-28 for location of starter and

horn push button switches.

tery and generator indicator. Tag and disconnect

electrical connection. Remove three nuts and lock-

(2) Tag and disconnect electrical connections.

(3) Unscrew boot covering pushbutton and remove

washers to remove indicator from instrument panel.

switch.

b. Testing Test the battery and generator indicator

c. Inspection. Inspect switches for corrosion, loose

by connecting it to a power source along with another

connections and defective wiring. Replace a defective

voltmeter of known accuracy. Compare the readings on

switch.

both meters to determine the accuracy of the indicator.

d. Installation.

The indicator readings should correspond as follows:

(1) Screw bool and push button switch into instru-

red (lb), 18-22V, yellow, 22-26V, green, 26-30V, and

ment panel. Refer to figure 4-28 for proper location.

red (rh), 30-34V.

(2) Reconnect electrical connections.

c. Inspection. Inspect the battery and generator in-

dicator for broken cover glass and loose electrical con-

4-48. Light Switch

nections. Replace a defective indicator.

a. General. The light switch controls the panel lights,

d. Installation. Reinstall three mounting nuts and

headlights, taillights, marker lights, and blackout head

lockwashers to install battery and generator indicator

lights and taillights. Operate switch and observe lights

in instrument panel.

for proper operation. Check for burned out light bulbs

4-45. Toggle Switches

and correct wiring before attributing failure to a defec-

tive switch.

a. General. The two toggle switches control the front

b. Removal. Refer to figure 4-28 for location of light

and rear floodlights. Before removing switches, check

switch. Tag and disconnect electrical connections.

operation in ON and OFF positions by observing opera-

Remove four screws mounting light switch to instru-

tion of the floodlights. Before attributing a malfunc-

ment panel and remove light switch.

tion to a defective switch, make sure that lamps are not

c. Inspection. A Inspect the light switch for cracks,

burned out and that electrical connections are correct.

breaks, loose connections, and defective or missing

b. Removal. Refer to figure 4-28 for location of the

hardware. Replace a defective switch.

front and rear floodlight toggle switches. Tag and dis-

d. Installation. Use four screws to mount light

connect electrical connections. Remove two locknuts to

switch to instrument panel. Reconnect electrical con-

remove switch from instrument panel.

nections.

c. Cleaning and Inspection

(1) Clean toggle switches with an approved clean-

4-49. Hydraulic Control Levers

ing solvent and dry thoroughly, or use low pressure

a. Removal Refer to figure 4-28 and remove the hy-

compressed air and blow air into switch to clean.

draulic control levers.

(2) Inspect switches for loose connections or

b. Cleaning and Inspection.

broken hardware. Replace a defective switch.

(1) Clean the control levers with an approved

cleaning solvent.

d. Installation. Mount toggle switch on instrument

4-25