Section 12: BRAKE AND AIR SYSTEM
PA1562
8
Pay particular attention to the internal passages.
Inspect all parts for damage and replace if
necessary.
6. AIR GAUGES (PRIMARY, SECONDARY
AND ACCESSORY)
The air pressure gauges, located on the
dashboard (see
"Operator's Manual"
), are
connected to the DC-4 double check valve,
located on the pneumatic accessory panel in the
front service compartment.
The latter is connected to the air lines running
from the primary and secondary air tanks, as
shown on the pneumatic system diagram
provided in the technical publications box. The
accessory air gauge is connected to the
accessory air tank using the drain valve
connector. The vehicle should never be set in
motion until the buzzer alarm and warning lights
turn off, i.e. when air pressure registers at least
66 psi (455 kPa). Moreover, if pressure drops
below 66 psi (455 kPa), the
"Low air pressure"
warning lights will turn on, and the
"Low air
pressure"
buzzer will sound. Stop the vehicle
immediately, determine and correct the cause(s)
of pressure loss. Check the gauges regularly
with an accurate test gauge. Replace the gauge
with a new unit if there is a difference of 4 psi
(27 kPa) or more in the reading.
7. AIR
FILTER/DRYER
FIGURE 6: HALDEX AIR FILTER DRYER
12194
The air filter/dryer is located in front of rear
wheelhousing above drive axle (Fig. 1, 2 & 6).
Its purpose is to remove moisture that could
damage the air system before the air enters the
system reservoir. The air filter/dryer also filters
the air to remove dirt, compressor oil, and other
contaminants that can damage the system.
Change cartridge every 100,000 miles (160 000
km) or once every two years, whichever comes
first. The air dryer may be purged for mainte-
nance purposes using the remote drain valve
located in the engine compartment and
accessible through the engine compartment
R.H. side door. The valve is positioned close to
the L.H. side of door opening (Fig. 3). The air
filter/dryer has a built-in governor to maintain the
system between 108 psig and 123 psig.
Maintenance and repair information is supplied
in the maintenance information annexed to this
section.
7.1
AIR FILTER/DRYER PURGE TANK
A tank is supplied to purge the air filter/dryer to
remove moisture and contaminants.
8. AIR
LINES
Copper piping, nylon-reinforced tubing, and
flexible hoses are used to connect the units in
the pneumatic system, including air brake
system, suspension system and accessory
systems such as the entrance door, fresh air
damper cylinder, air horns, etc. Furthermore, the
nylon tubing is color coded to ease identification.
Refer to the following table for the complete
color identification code. Service instructions for
each type of air line are also provided under the
applicable headings.
Color
Circuit
Red Secondary
Green
Primary and Delivery
Yellow Parking
Brake
Blue Suspension
Black Accessory
Brown Trailer
Brake
8.1 COPPER
PIPING
A heat dissipation copper piping assembly is
used to dissipate the heat coming from the
compressor before it enters the air filter/dryer.
Connections should be checked for leakage at
least every 6,250 miles (10 000 km) or twice a
year, whichever comes first. Tighten or replace
when necessary. When replacing copper piping,
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Страница 13: ...Section 00 GENERAL INFORMATION 11 PA1562 FIGURE 16 METRIC US STANDARD CONVERSION TABLE 00005...
Страница 14: ...Section 00 General Information PA1562 12 FIGURE 17 CONVERSION CHART 00006...
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Страница 941: ...Initial Installation Section 2 Initial Installation Installation 14 Maintenance Tips 15...
Страница 961: ...Section 4 Reinstallation Reinstallation 34 Filling and Air Bleeding the System 35 Maintenance Tips 36 Reinstallation...
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Страница 996: ...Section 16 SUSPENSION PA1562 28 FIGURE 34 SWAY BAR FRONT SUSPENSION 16138B FIGURE 35 SWAY BAR REAR SUSPENSION 16144...
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Страница 1111: ...19 Manual No 7018081 02 Rel Jun 1999 Copyright Isringhausen 1999 PARTS MODEL 6800 338 BUS MODEL 6800 338 PREMIUM LX...
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Страница 1156: ...Section 22 HEATING AND AIR CONDITIONING PA1562 14 FIGURE 16 REFRIGERANT CIRCUIT CENTRAL AND AUXILIARY SYSTEMS 22313_1...
Страница 1178: ...Section 22 HEATING AND AIR CONDITIONING PA1562 36 FIGURE 36 CENTRAL HEATING SYSTEM COMPONENTS 22325...
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Страница 1278: ...Section 23 ACCESSORIES PA1562 18 FIGURE 26 FUNCTIONING OF LAVATORY 23051...
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Страница 1414: ...Section 24 LUBRICATION PA1562 4 FIGURE 1 LUBRICATION AND SERVICING POINTS ON INDEPENDENT FRONT SUSPENSION VEHICLES 24031_1...
Страница 1415: ...Section 24 LUBRICATION PA1562 5 FIGURE 2 LUBRICATION AND SERVICING POINTS ON I BEAM AXLE FRONT SUSPENSION VEHICLES 24030_1...
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