Section XI. MAINTENANCE OF CONTROLS AND INSTRUMENTS

TM 10-3930-242-12

Section XI. MAINTENANCE OF CONTROLS AND INSTRUMENTS

WARNING

d. Installation. Install three mounting nuts and

Drycleaning solvent, P-D-680, used to

lockwashers to install battery and generator in-

clean parts is potentially dangerous to

dicator in instrument panel.

personnel and property. Do not use near

4-46. Toggle Switches

open flame or excessive heat. Flash point

of solvent is 138F.

a. General. The two toggle switches control the

front and rear floodlights. Before removing swit-

4-43. General

ches, check operation in ON and OFF positions by

This section contains information for organizational

observing operation of the floodlights. Before at-

maintenance of the controls and instruments of the

tributing a malfunction to a defective switch, make

forklift truck.

sure that lamps are not burned out and that elec-

WARNING

trical connections are correct.

Disconnect battery (+) cable from bat-

b. Removal.

tery before disconnecting any wiring

(1) Refer to figure 4-31 for location of the front

under dash.

and rear floodlight toggle switches.

(2) Tag and disconnect electrical connections.

4-44. Engine Hourmeter

(3) Remove two locknuts and remove switch

a Removal. Refer to figure 4-31 for location of

from instrument panel.

hourmeter. Tag and disconnect electrical lead.

c. Cleaning and Inspection.

Remove six nuts, six screws, and three lockwashers

WARNING

attaching hour-meter to instrument panel and

Compressed air used for cleaning pur-

remove hourmeter.

poses will not exceed 30 psi. Use only

with effective chip guarding and personal

b. Inspection and Testing.

protective equipment (goggles/shield,

(1) Inspect the hourmeter for broken glass.

gloves, etc.)

Inspect the electrical wiring for cuts, breaks, and

(1) Clean toggle switches with an approved

deterioration.

cleaning solvent and dry thoroughly, or use low

(2) Connect hourmeter to a 24 volt power source

pressure compressed air.

and check for proper operation by checking in-

(2) Inspect switches for loose connections or

dicator above odometer wheels. Indicator should

broken hardware. Replace a defective switch.

revolve once per minute.

d . Installation. Mount toggle switch on in-

(3) Replace a defective hourmeter.

strument panel using two locknuts. Reconnect

c. Installation. Install hourmeter in instrument

electrical connections.

panel using six screws, three lockwashers, and six

nuts. Connect electrical lead.

4-47. Panel Lights

4-45. Battery and Generator Indicator

a. Removal. Refer to figure 431 for location of

panel lights. Disconnect electrical connector and

a. Removal. Refer to figure 4-31 for location of

remove two mounting screws to remove panel lights

battery and generator indicator. Tag and disconnect

from instrument panel.

electrical connections. Remove three nuts and

b. Inspection. Inspect the panel lights for loose

Iockwashers and remove indicator from instrument

connections, defective wiring, and missing or

panel.

burned out light bulbs. Replace defective lights.

b. Testing Test the battery and generator in-

c. Installation. Use two screws to mount panel

dicator by connecting it to an external 24-volt power

light on instrument panel. Connect electrical con-

source along with another voltmeter of known

nector.

accuracy. Compare the readings of both meters to

determine the accuracy of the indicator. The in-

4-48. Starter and Horn Push Button Switches

dicator readings should correspond as follows: red

a. Testing. Test for a defective switch by

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

disconnecting leads from switch to horn or starter,

red(rh), 30-34V.

and connecting a test light between the switch

c. Inspection. Inspect the battery and generator

terminals. Push the button. If the test light does not

indicator for broken cover glass and loose electrical

light, the switch is defective.

connections. Replace a defective indicator.

4-31