5-30 Other Features
PA-1628Operator's ManualH3-45 COACH
obstacles.
Low-buoy operation is controlled by a valve located
on the lateral console. Toggle the low-buoy control
lever rearward to lower the coach. Toggle the control
level forward to return the coach to normal ride
height. A pictogram appears in the Driver Information
Display if the coach speed exceeds 12 mph (20
km/h) when lowered. Refer to " LOW- BUOY
CONTROL VALVE (OPTION)" on page14 in
Section 4 Controls and Instruments.
CAUTION
Avoid parking too close to the curb or other
obstacles that could damage the coach during low-
buoy operation.
WARNING
Use only below 5 mph (8 km/h).
WARNING
The Low- Buoy cannot be activated when the
coach is traveling over 5 mph (8 km/h). Con-
sequently, the driver cannot inadvertently operate
the Low-Buoy system at higher speeds.
NOTE
The Low- Buoy cannot be activated when the
coach is traveling over 5 mph (8 km/h).
Consequently, the driver cannot inadvertently
operate the Low-Buoy system at higher speeds.
RETRACTABLE TAG AXLE
Tag axle is controlled by a valve located on the
lateral control panel. 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 valve position. Refer to
"TAG AXLE CONTROL VALVE" on page14 in
Section 4, Controls and Instruments.
The tag axle service brakes operate only when the
tag axle is in the wheels down position. Never lower
the tag axle while the coach is moving. A pictogram
appears in the Driver Information Display if the
vehicle speed exceeds 12 mph (20 km/h) with tag
axle raised. The tag axle can be raised in tight
maneuvering areas like in a parking lot or to make it
easier to turn a short corner. The tag axle shortens
the wheelbase and allows tighter turning. Raising
the tag axle transfers extra weight and additional
traction to the drive wheels providing improved
control on slippery roads.
CAUTION
Do not use tag axle in raised position for an
extended period. Raising tag axle increases load
on the drive axle, suspension and tires.
Do not drive vehicle with tag axle raised when
speed is exceeding 12 mph (20 km/h).
In order to prevent damage to the suspension,
always raise the tag axle before lifting the coach.
VARIABLE ASSISTANCE STEERING
GEAR (OPTIONAL)
The steering effort is controlled automatically in
relation to vehicle speed. For more information, refer
to Maintenance Manual Section 14: Steering.
PREHEATER
The optional auxiliary heating system is used for
preheating and retaining the heat of water- cooled
engines. It can be used before start- up to ease
starting and to provide rapid interior heat. It can also
be used with the engine running to maintain coolant
heat and interior temperature.
The heater operates independently of the engine. It
is connected to the cooling system heating circuits
and to the vehicle’s fuel and electrical system.
WARNING
The preheater 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 Heater "On" symbol appears on the timer
display when the heater is switched on. Air is forced
in to flush out the combustion chamber of any
residual gases and the water circulation pump begins
operating. The fuel metering pump delivers fuel to
the combustion chamber, where fuel and combustion
air form a combustible mixture which is ignited by the
ignition unit.
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