OTHER FEATURES
RETRACTABLE TAG AXLE
The optional lifting of the tag axle is controlled by
a valve located on the left lateral console. The
valve can be switched to either the WHEELS UP
or WHEELS DOWN position. The axle will be
automatically raised or lowered by air pressure
according to the position of the valve switch.
Refer to "Controls & Instruments" chapter 3.
The tag axle service brakes and parking brakes
operate only when the tag axle is in the
WHEELS DOWN position. Never lower the tag
axle while the coach is moving. When the tag
axle is in the WHEELS UP position, the
corresponding indicator light will illuminate and a
beep will sound to alert the driver of the tag
axle's position. Lifting the tag axle shortens the
wheelbase and allows tighter turning. This is
very useful in tight maneuvering areas like in a
parking lot or when negotiating a tight corner.
Raising the tag axle transfers extra weight and
additional traction to the drive wheels providing
improved control on slippery roads.
Caution:
In order to prevent damage to the
suspension, always raise the tag axle before
lifting the vehicle.
Caution:
Never lower the tag axle while vehicle
is moving.
TAG LOAD RELEASE SYSTEM (TLR)
This standard system allows for automatic
unloading of the tag axle air springs (without
raising the axle), whenever speed drops to less
than 8 mph (13 km/h) and steer angle exceeds
22.5° (1 1/4 turns of the steering wheel). The
system automatically transfers the tag axle load
to the drive axle. This reduces tag wheel
shearing to enable shorter turning radii for tighter
cornering and remarkable agility in close-quarter
maneuvering, whether backing up or moving
forward.
COOLANT HEATER
This optional auxiliary heating system is used for
preheating and retaining the heat of water-
cooled engines. It can be used before startup to
ease starting and to provide rapid operation of
the interior heating system. It can also be used
with the engine running to maintain coolant heat
and interior temperature.
L.H. SIDE REAR SERVICE COMPARTMENT
05058
The heater operates independently of the
engine. It is connected to the cooling system,
heating circuits and to the vehicle fuel and
electrical system.
Warning:
The coolant heating system uses
the same fuel as the engine. Do not operate in a
closed building or while refueling. Operate only
in a well ventilated area.
SWITCHING THE HEATER ON
The pilot lamp illuminates when the heater is
switched
ON
. Combustion air flows in to flush
out the combustion chamber and the water
circulation pump begins operating. The fuel
metering pump delivers fuel in precise amounts
to the combustion chamber, where fuel and
combustion air form a combustible mixture which
is ignited by the glow plug.
Once the flame sensor has signaled to the
control unit that combustion has taken place, the
glow plug and ignition coil are switched
OFF.
Hot combustion gases are diverted at the end of
the flame pipe and are then forced through the
indirect heating surfaces of the heat exchanger.
The heat exchanger transfers the heat to the
coolant water passing through the heat
exchanger.
The heater is thermostatically controlled and
operates intermittently (i.e., the switched-on time
of the burner varies depending on the heat
requirement). The water temperature is
controlled by the built-in water thermostat.
The water circulation pump remains in operation
as long as the heater is operating, even during
the regulated intervals and during the delayed
cut-out of the heater. The pump can also be
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