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Operation - Section 3
Page 3-18
(15) Left Turn Indicator (Red Light)
This light flashes to indicate that the
left turn signal lights on the truck
have been activated. It will also
flash simultaneously with right turn
signal indicator (17) when "Hazard"
switch (on steering column) is On.
(16) High Beam Indicator (Blue Light)
The high beam indicator light,
when lit, indicates that the truck
headlights are on "High" beam. To
switch headlights to "High" or
"Low" beam, pull lever-operated
dimmer switch (turn signal lever)
and release.
(17) Right Turn Indicator (Red Light)
This light flashes to indicate that the
right turn signal lights on the truck
have been activated. It will also
flash simultaneously with left turn
signal indicator (15) when "Hazard"
switch is On.
(18) Tachometer and Hourmeter
This gauge includes an Hourmeter to register engine
hours of operation and a Tachometer which registers
engine speed in hundreds of Revolutions Per Minute
(RPM).
Adjusted Engine Speeds are:
Low Idle -- 700 ± 25 RPM.
High Idle, No load -- 2350 RPM
Governed Speed -- 2100 RPM
Instrument Panel and Controls
Retarder Operation
When approaching a descending grade, the operator
should slow the truck and select the proper transmis-
sion gear range to maintain an engine speed of 1650 --
2350 RPM (green area on tachometer) and the brake
oil temperature below 250
operation. Refer to the Grade/Speed decal in the cab
above the windshield.
When descending a grade, the operator should apply
the retarder pedal and observe both the Tachometer
and the Brake Oil Temperature Gauge (12). The en-
gine RPM must be maintained at 1650 -- 2350 RPM
(green area on tachometer) and the Brake Oil Tem-
perature must be maintained below 250
If the operator observes that either the maximum en-
gine speed of 2350 RPM or the Brake Oil Temperature
o
o
of 250
F (121
C) are about to be exceeded, the opera-
tor should immediately move the transmission range
selector to the next lower range and apply the service
brakes until the truck is slowed to a speed which will
permit the transmission to downshift to the gear range
selected. Continue this procedure to downshift to the
required gear range to maintain engine speed at 1650
-- 2350 RPM and brake oil temperature below 250
o
(121
C). The service brakes should be used only long
enough to slow the truck to allow the transmission to
downshift. When the proper gear range is attained,
continue using the retarder to maintain a safe, produc-
tive speed.
If brake oil temperature exceeds 250
Brake Oil Temperature Warning light (39) will turn on.
As quickly as safety will permit, bring the truck to a
complete stop away from traffic, move transmission
range selector to "Neutral", apply the parking brake,
and run engine at high idle. Continue to run engine at
high idle until Brake Oil Temperature Warning light
turns off and brake oil temperature cools to below
o
o
250
F (121
C). If temperature does not return to this
range within a few minutes, report the condition imme-
diately to maintenance personnel and wait for further
instructions before moving truck.
OM3012.3
o
o
F (121
C) during retarder
o
o
F (121
C).
o
o
o
F (121
C), the
F
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