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Operation - Section 3
Page 3-22
Keyswitch
The keyswitch (1, Figure 3-6) is a three position (Off,
Run, Start) switch.
''OFF'' --
Key insertion/withdrawal position --
None of the electrical circuits are en-
ergized in this position.
Turn the switch to ''OFF'' to stop the
engine.
''ON'' --
When the switch is rotated one position clock-
wise, it is in the ''Run'' position.
Lamp circuits and other electrical circuits (except
''Start'') are energized in this position.
''START'' --
With Transmission Selector Lever
in the ''Neutral'' position, rotate
keyswitch fully clockwise to the
''Start'' position and hold until en-
gine starts. ''Start'' position is
spring loaded to return to ''Run''
when key is released.
NOTE: The engine start circuit is equipped with the
Cummins Engine Prelube System. A noticeable time
delay will occur (while engine lube oil passages are
being filled) before starter engagement and engine
cranking will begin. The colder the engine oil tempera-
ture, the longer the time delay will be. In addition, if
truck is also equipped with Engine Starting Aid for cold
weather starting, the Engine Prelube System should be
engaged FIRST for 5-10 seconds, or until starter is
engaged, BEFORE activating the Engine Starting Aid.
Instrument Panel and Indicators
Starting fluid is extremely volatile and flammable!
Use with extreme care.
If truck is equipped with optional Engine Starting Aid
and ambient temperature is below 50
the keyswitch to the ''Start'' position, and while crank-
ing engine, move the Engine Starting Aid switch to the
''On'' position for three (3) seconds MAXIMUM; then
release Engine Starting Aid. If engine does not start,
wait at least fifteen (15) seconds before repeating the
procedure.
Do not crank an electric starter for more than 30
seconds.
Allow two minutes for cooling before attempting to start
engine again.
Severe damage to starter motor can result from over-
heating.
Auxiliary Brake Switch
This switch (2, Figure 3-6) applies the Auxiliary Brake.
Depress the center button to apply the auxiliary brake.
When the switch is ''On'', the RED lamp will illuminate.
Depress the button again to release the auxiliary brake;
the light will turn ''Off''.
When the auxiliary brake switch is activated, full,
unmodulated hydraulic brake pressure (or what-
ever pressure remains, if the system is failing) is
applied to all wheels.
In addition, the parking brake is also applied.
The operator should not apply the auxiliary brake
switch when the truck is moving, except as an
emergency measure.
NOTE: This switch is for the manual activation of the
auxiliary brake circuit by the operator.
The auxiliary brake circiut will apply automatically, if
the hydraulic brake pressure decreases below a pre-
set value.
OM3006.3 04/98
o
o
F (10
C), turn
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