Figure 2-39. Bumper Turret Controls (Sheet 2 of 2).

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Figure 2-39. Bumper Turret Controls (Sheet 1 of 2).

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TM-9-2320-279-10-3 M977 Series 8x8 Heavy Expanded Mobility Tactical Trucks (HEMTT) Manual

Figure 2-40. Roof Turret Controls.

TM 9-2320-279-10-3

Controls and Indicators (Cont)

2-91. LOCATION AND USE OF CONTROLS AND INDICATORS (CONT).

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Figure 2-39.

Bumper Turret Controls (Sheet 2 of 2).

Key

CONTROL OR INDICATOR

FUNCTION

OSCILLATION ON/OFF Switch

Used to activate and deactivate turret auto-

oscillation mode. Joystick control handle can be

used to elevate or depress bumper turret nozzle

during auto-oscillation mode. Joystick control

handle will override auto-oscillation mode back

to joystick control mode if moved left or right

during auto-oscillation mode. To reactivate

auto-oscillation mode after joystick override,

push oscillation toggle to ON (-) position. The

turret will always reactivate to the left.

OSCILLATION LIMITS Control

Used to set left/right limits of auto-oscillation

Knob

mode. Two oscillation limit control knobs are

stacked together. Small knob on top controls

right oscillation limit. Larger knob on bottom

controls left limit angle. Pin on top of each knob

is set point for oscillation limit control.

HORIZONTAL SPEED Control

Rotary adjustment to regulate rotation and

sweep speed of bumper turret when in joystick

control mode or auto-oscillation mode. Full slow

position will not stop turret.

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