Warm-up
After starting the engine. increase speed to fast idle for
warm-up period by using
(cfast
idlen switch
on
front
switch panel. Parking brakes should be kept applied
throughout warm-up. Gages and indicator lights should
also be monitored to check for abnormal conditions
of
the engine. If abnormal conditions should develop,
stop engine immediately and contact service people.
Air
pressure
Air pressure is of the utmost importance for this vehi-
cle. Brakes, air suspension as well as several other
systems and controls depend
on
adequate air pres-
sure for proper operation.
During warm-up, uairn indicator will light and buzzer
will sound until air pressure builds
up
to 60-70 psi
( 415-485 kPa) . Air pressure should build
up
to
85
psi
(585
kPa) before parking brake is released and all air
operated systems are provided with sufficient air pres-
sure to operate properly.
•
WARNING:
Vehicle should not
be
operated with air
pressure below 100 psi
(690
kPa) as brake efficiency
could then be reduced, resulting in increased stop-
ping distance.
Vehicle should be stopped
as
quickly as possible if
«aim
indicator lights and buzzer sounds during normal
operation.
Engine
oil
specifications
Heavy duty engine oil meeting MIL-L-2104C
or
MIL-L-
46152 specifications should be used
for
the engine.
Oil grade should be SAE-40 for vehicles operating
at
temperatures above
0°F
(
-18°C).
and SAE-30 for
operation below
0°F
(
-18°C).
Engine
oil
pressure
Engine oil pressure gage is mounted
on
the instru-
ment panel in front
of
the driver. Normal readings at
operating temperature are: idling 9-18 psi (60-125
kPa), governed full speed 35-70 psi (240-480 kPa). If
oil pressure falls below safe level, uoilu indicator light
will
go
on
and alarm buzzer will sound. In this event.
vehicle must be stopped as quickly as possible.
Since the vehicle is equipped with an automatic shut-
down
device, the engine will stop after
25
seconds.
Engine
oil
level
check
The best time to check engine oil level is when the oil is
warm, as for instance during a fuel stop. First, stop
engine and wait about 5 minutes for the oil to drain
20
back into the oil pan. Then, pull out the dipstick, wipe
clean, and push it
back
down
fully. Pull out the dipstick
again and
look
at the oil level
on
the dipstick. Keep the
oil level between the two marks (" F" and " L" )
on
the
dipstick. Push the dipstick back
down
all the way after
taking the reading . Add oil if needed.
0
NOTE:
The engine oil dipstick is located near the
engine block at the right
of
the crankshaft pulley.
Engine
temperature
Engine temperature gage
or
C<Watern
is mounted
on
the instrument panel in front
of
the driver. The most
efficient temperature range is between
170°-195°F
(76°-90°C).
Vehicle should not be moved before tem-
perature reaches
140°F
(60°C)
. If engine overheats,
the «hot watern indicator light will
go
on
and warning
buzzer will sound.
Since the vehicle is equipped with an automatic shut-
down
device. the engine will stop after 25 seconds.
O
NOTE:
To move the vehicle out of traffic, the auto-
matic shut-down system for low oil pressure
or
hot
water can be overridden in the following way:
1.
Turn ignition switch to off position.
2. Re-start vehicle by turning ignition switch to start
position. Then release it as soon as engine starts.
Vehicle will then run
for
25 seconds, which should be
sufficient to move vehicle off the road.
Optional engine brake system
Optional engine brake system, when energized, will
increase engine power absorption in coasting. Engine
brake system may be used for decelerating downhill
or
city traffic driving,
or
when approaching stop signs.
cc
Engine brake» switch is mounted
on
the front panel.
With switch in low position, system will
work
at half
engine braking capacity. With switch in high position,
full braking capacity will be obtained.
Engine brake system is operative only when switch is
in low
or
high position and
no
pressure is being applied
to the accelerator.
Effectiveness
of
the engine brake system will vary accor-
ding to transmission
gear
in use. The engine brake
system is more effective in lower gears and at higher
engine speeds.
•
CAUTION:
To avoid engine damage, engine should
never
be
allowed to exceed governed speed. Supple-
ment engine brake with vehicle service brakes intermit-
tently
and/or
shift to a higher transmission gear to
prevent engine overspeed.
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