Level Low System - PREVOST H3-45 VIP Owner's Manual

LEVEL LOW SYSTEM

FIGURE 14: LEVEL LOW SYSTEM CONTROLS
When driving, the conventional air leveling system
of the vehicle controls the height at three points:
the front, the left rear and the right rear. Your
vehicle is equipped with a suspension system that
consists of air springs (pressurized air bellows)
located near each wheel. The amount of air in each
air spring (and thus the vehicle height) is controlled
by automatic leveling valves that operate between
the chassis and the axles of the vehicle.
The three leveling valves are located as follows:
one at the front which controls the amount of air in
both front air springs, one at the left rear which
controls the left rear corner of the vehicle and one
at the right rear which controls the right rear corner
of the vehicle.
During normal driving,
automatically to maintain the chassis at the proper
level above the axles, indifferent of road conditions
or vehicle weight.
NOTE
Prevost vehicles are designed to operate within
specific weight load/ranges for each axle (GAW)
and for total vehicle weight (GVW). If the coach
is heavier than the design limits, Level Low
System (LLS) components
problems can occur..
When parked, and ONLY when parked, the level of
the vehicle can be manually adjusted within the
range of travel of the air springs. Thus, if the
vehicle is parked on uneven ground, the manual
override leveling system can be used to level the
chassis of the vehicle.
With the engine running, turn the selector switch
located on L.H. side control panel to the area of the
vehicle requiring leveling, then press the rocker
switch accordingly (up or down) to inflate or deflate
the selected set of air springs.
these valves work
damage and
PA-1619 Owner's Manual H3-45 VIP
Controls and Instruments 4-15
The front position raises or lowers the front only
and does not tilt the vehicle to its sides. Each rear
position raises or lowers its respective side,
therefore, the rear positions can be used to tilt the
vehicle to one side or the other, or they can be
used to raise or lower the rear of the vehicle. When
leveling, it is often necessary to run the engine in
order to get an adequate air supply.
NOTE
For maximum ease of ingress and egress as
well as for maximum leveling range, lower the
vehicle completely before leveling.
NOTE
It is always better to first level the rear of the
vehicle (right to left) before raising or lowering
the front. After adjusting the rear, watch the level
indicator as you adjust the front. If the level
indicator shows that the vehicle is starting to tilt
to either side, stop adjusting the front as one of
the air springs has come to the end of its travel
range.
After manual leveling, turn OFF the engine. The
vehicle will stay in the leveled position (the air is
"locked" in the air springs) as long as there are no
air leaks. The vehicle will hold this position for
several days. When engine is restarted, with the
level selector switch in the OFF position and air
pressure is adequate,
automatically level itself for driving conditions.
DANGER
Do not drive the vehicle with the level low
selector switch in any position other than OFF,
as this may render the vehicle unsafe and
uncontrollable.
If this is the case, the Level Low warning telltale
light in the dashboard will flash, reminding you
that the selector is not in the OFF position.
NOTE
If, for any reason, you wish to start the engine
without moving the vehicle (to warm up the engine
for instance) while keeping the vehicle in the
manually leveled position, place selector switch in
any position except OFF. When ignition switch is
turned to the OFF position, reset the selector
switch to the OFF position.
the vehicle will