cause an accident resulting in property damage,
personal injury, or death.
Air pressure gauges register the pressure in the pri-
mary and secondary air systems. Normal pressure
with the engine running is 100 to 120 psi (690 to 827
kPa) in both systems. See
Fig. 19.21.
Air pressure gauges are required on all vehicles with
air brakes. A low-air-pressure warning light and
buzzer, connected to both the primary and secondary
systems, activate when air pressure in either system
drops below a minimum pressure of 65 to 75 psi
(448 to 517 kPa).
When the engine is started, the warning light and
buzzer remain on until air pressure in both systems
exceeds minimum pressure.
Coolant Temperature Gauge
NOTICE
A sudden increase in coolant temperature may
indicate engine or cooling system failure. Bring
the vehicle to a safe stop and investigate the
cause to prevent further damage. Do not operate
the engine until the cause has been determined
and corrected.
During normal engine operation, the coolant tem-
perature gauge should read 200 to 205°F (93 to
96°C). See
Fig. 19.22. If the temperature remains
below 160°F (71°C) or exceeds 235°F (113°C), in-
spect the cooling system to determine the cause.
See the vehicle workshop manual for troubleshooting
and repair procedures.
The coolant temperature gauge is very important.
See
Fig. 19.22. If the coolant temperature rises
above 253°F (123°C), the check engine and stop
engine lights will illuminate, and the buzzer will
sound. At this point, the engine will derate and idle
speed will increase, to speed up the cooling fan and
water pump to cool the engine.
Grade Brake
IMPORTANT: The grade brake is an optional
auxiliary brake system that works through the
02/06/2012 f040799
WARNING MESSAGES
DISPLAY
MESSAGES
H*
WARNING
Warning Message
No Warning
Messages in List /
Msg Displayed for 5 Sec. /
Display Next Entry in
Warning Message List
Any Button Press
/
Display 1
st
Message
in Warning
Message List
Screen AN
Fig. 19.16, Warning Messages
Propane Fuel System
19.21
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