Section III. CONTROLS AND INSTRUMENTS

Figure 2-20. Anti-rotation bars, stowed.

Figure 2-23. Crane operating control handles and levers. - TM-5-3810-201-120056

TM-5-3810-201-12 Crane-Shovel Basic Unit Crawler Mounted 40 Ton 2 Cu Yd Diesel Driven Manual
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Section III. CONTROLS AND INSTRUMENTS

d. Boom Hoist Pawl Control Handle. The boom

2-7. General

hoist pawl control handle (fig. 2-23) enables operator to

This section describes the various contols and

disengage pawl from boom hoist drum ratchet. Push

instruments and provides operator/crew sufficient

down to engage, and turn one quarter turn clockwise to

information to insure proper operation of the crane-

lock the control. To release pawl from the ratchet, raise

shovel.

boom slightly by pulling boom hoist lever toward

operator, turn handle one quarter turn counterclockwise,

2-8. Controls and Instruments

then pull up on handle.

a. General. The following instruments and controls

e. Swing Brake Hydraulic Control Handle. This

are identified on illustrations indicated.

handle (fig. 2-23) locks swing brake. To apply swing

b. Tachometer (Time Totalizing Meter).

brake, push swing brake lever (fig. 2-24) forward, then

(1) The tachometer-hour meter is located at

push down on hydraulic control handle and turn it 1/4

top of instrument panel (fig. 2-22) and indicates speed

turn clockwise to lock. To release swing brake, turn

(in revolutions per minute) at which engine is operating.

hydraulic control handle 1/4 turn counterclockwise then

(2) The hour meter portion of tachometer is

pull up.

calibrated to register engine hours at 1,411 rpm.

f. Propel Brake Hydraulic Control Handle. This

Operation at other speeds subject to interpolation.

handle (fig. 2-23) locks propel brake. To apply, push

c. Instrument Panel Lights. Two panel lights (fig.

hoist clutch and propel brake lever away from operator,

2-22) illuminate instrument panel on control stand. Two

then push down on hydraulic control handle and turn 1/4

others illuminate lighting control box area.

turn clockwise to lock. To release propel brakes, turn

the handle counterclockwise one quarter turn and pull

up.

g. Windshield Wiper Switch (Winterized Models

Only). This is a two position toggle switch (fig. 2-22).

Move toggle up to turn wiper motor ON. When pulled

down, wiper motor is OFF.

h. Horn Push Switch. When depressed, horn push

switch (fig. 2-22) completes electrical circuit and horn

sounds warning. When pressure is released, horn shuts

off.

i. Run-Shutdown Switch. Moving this switch (fig.

2-22) to RUN energizes starter circuit; fuel shutoff

solenoid in fuel pump cover; the low oil pressure/water

high temperature warning light switch circuits, and

governor overspeed micro-switch circuit. Before engine

starts, low oil pressure warning light will be red. If this

red light does not go out within 15 seconds after engine

starts, move switch to SHUTDOWN and investigate. If

either light becomes red during normal engine

operation, stop engine (para 2-11), move switch to

SHUTDOWN and investigate. If governor overspeed

microswitch (normally closed) opens because engine

speed reaches 1,935 rpm + 15 rpm, open circuit will

deenergize solenoid in fuel pump cover and shut off fuel

supply, stopping engine. Always move this switch to

SHUTDOWN after engine has been stopped (para 2-

11).

j. Starter Push Switch.

After moving RUN-

SHUTDOWN switch to RUN, depressing this switch (fig.

2-22) will cause starter solenoid to engage starter, and

start engine.

Figure 2-22. Instrument control stand.

2-23

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