TM 55-1930-203-10
position, the transmission shifts to neutral and the engine stops. When the lever is in mid-position, the engine is running and the
transmission is in operating position. When the lever is pulled all the way back, the engine will idle and the transmission will be in
neutral. When starting the engines, the cutout levers must be in mid-position.
2-5. Marine Gear Control Valves
The marine gear control valves (4, sheet 1, fig. 2-1) are actuated by a hand lever. Moving the valve lever shifts the marine gear from
neutral to forward or reverse and shuts off the radiator fans during marine operation. After the marine gear engagement is in forward
or reverse, continued movement of the lever will increase the engine speed from idle to full speed.
2-6. Headlight Switch
The headlight switch (7, sheet 1, fig. 2-1) is located on the starboard side of the instrument panel. When the lever is to the left, the
headlights are off. The lights are on when the lever is to the right. The headlights can be switched from high beam to low beam by
means of a foot controlled dimmer switch. The high beam is indicated by a small light (6) located above the main light switch.
2-7. Navigation Light Switch
The navigation light switch (8, sheet 1, fig. 2-1) controls the port and starboard running lights, range light, and bow light for night
marine operations.
2-8. Windshield Wiper Control Knob
The windshield wiper control knob (9, sheet 1, fig. 2-1) is located on the right side of the instrument panel. Speed of the wiper
increases as the control knob is turned counterclockwise.
2-9. Tire Inflation Control Valve Lever
The tires are inflated or deflated by a control valve lever (11, sheet 1, fig. 2-1) mounted on the right side of the instrument panel.
There are three positions of the control valve lever: midposition is neutral, the raised position inflates the tires, and the lowered
position deflates the tires. A safety relief valve will not allow the tires to be inflated above 70 p.s.i. The airline to each tire has a
manually operated tire air shutoff valve (2, fig. 2-2) used to isolate a tire during maintenance to the wheel or to prevent loss of air
from the system for other reasons.
NOTE
A tire cannot be deflated by the tire inflation control valve (11, fig. 2-1) unless the tire inflation check valve (fig.
2-3) in
the wheel is
depressed and locked in
position by
turning. If
the wheel valve is
not depressed, air in
that
tire will be isolated.
1 Airbrake shutoff valve
2 Tire Air shutoff valve
3 Brakes
Figure 2-2. Controls in miter box vicinity.
2-11