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OM3006.2 04/98
Operator Cab and Controls
RETARDER CONTROL LEVER
The Retarder Control Lever (6, Figure 3-2) is mounted
on the right side of the steering column. It can be used
to modulate the full range of retarding/braking effort
being applied to both the front and rear oil disc brakes.
Any application of the retarder lever will cause an
indicator light to illuminate in the L.H. instrument
panel/pod (Refer to ''Instrument Panel And Indicator
Lights'')
a. When the lever is rotated to full ''Up'' (counter-
clockwise) position, it is in the ''Off/No Retard''
position.
b. When the lever is rotated to full ''Down'' (clock-
wise) position, it is in the full ''On/Retard'' position.
c. For long downhill hauls, the lever may be posi-
tioned anywhere to provide a desired retarding
effort, and it will remain where it is positioned.
NOTE:
When retarding is completed, and acceleration is
resumed, be sure to return the lever to the full
''Up'' (counterclockwise/"Off/No Retard") posi-
tion, to prevent rapid wear to brake discs and/or
overheating of the brake cooling system.
The Retarder Lever and foot-operated Service Brake
pedal can be used simultaneously or independently.
The Retard Control Module (RCM) will determine which
device is requesting the most retarding/braking effort
and apply that amount.
SERVICE BRAKE PEDAL
The Service Brake Pedal (3, Figure 3-1) is a single
function, foot-operated pedal which controls and
modulates service brake pressure directly through a
hydraulic valve.
When the pedal is partially depressed, an indicator light
in the L.H. instrument panel pod (11, Figure 3-9) will
illuminate. As the pedal is further depressed, the serv-
ice brakes are actuated (a slight increase in pedal
resistance will be felt ) through a hydraulic valve, which
modulates pressure to the service brakes. Completely
depressing the pedal causes full application of both the
front and rear oil disc service brakes.
The Grade/Speed Chart (8, Figure 3-1) should always
be followed to determine MAXIMUM safe truck speeds
for descending various grades with a loaded truck.
ACCELERATOR (THROTTLE) PEDAL
The Accelerator Pedal (Throttle) Pedal (4, Figure 3-1)
is a foot-operated pedal which allows the operator to
control engine RPM, depending on pedal depression.
The foot-operated treadle pedal contains an electronic
sensor which sends signals to the Cummins Engine
Centry™ fuel control system.The movement of the fuel
governor control arm corresponds directly to the travel
of the treadle pedal as it is applied by the operator.
When the pedal is released, springs return the control
arm and the pedal to their ''rest'' position and the
engine speed returns to low idle.
INSTRUMENT PANEL
The Instrument Panel (5, Figure 3-1) includes a Center
Electronic Display Panel, and L.H & R.H. Panels/Pods
which contain a variety of switches and indicators.
Refer to ''INSTRUMENT PANEL AND INDICATOR
LIGHTS'' later in this Section, for a detailed description
of the function and location of each of these compo-
nents.
Operation - Section 3
Page 3-13
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