Section III. CONTROLS AND INSTRUMENTS
d. Boom Hoist Pawl Control Handle. The boom
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
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.
b. Tachometer (Time Totalizing Meter).
brake, push swing brake lever (fig. 2-24) forward, then
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
calibrated to register engine hours at 1,411 rpm.
f. Propel Brake Hydraulic Control Handle. This
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
g. Windshield Wiper Switch (Winterized Models
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
i. Run-Shutdown Switch
. Moving this switch (fig.
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
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-
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
Figure 2-22. Instrument control stand.