PREVOST Le Mirage XL II Ultimate, Service Manual

Page: 23 / 53

XL2 SLIDE-OUT SERVICE MANUAL
VACUUM SWITCH
A vacuum switch is mounted on the vacuum
generator output port and is used as an input
signal when the vacuum reaches the 16" Hg set
point. This input signal will detect an inflatable
seal failure if the 16" Hg set point is not reached
after a 30 seconds delay (figure 51).
TAG AXLE VALVE
The automatic control unloading tag axle valve is
used to freely lock and unlock the front slide-out
pins. The tag axle is not raised during this
process. A 3-port 2-position normally closed
valve is connected to the air spring valve
operator. An air system schematic diagram is
annexed to show the modifications. This valve is
located in the compartment near the main power
compartment (figure 28).
FIGURE
28 :
TAG AXLE VALVE
RACK CLEANING AIR NOZZLE
Both slide-out upper racks are not protected
against foreign material and water when the
slide-out is extended. To prevent damage to the
rack and pinion mechanism, an air nozzle is
placed above each upper rack to clean it when
the slide-out is retracted. A 2-port 2-position
normally closed manifold valve is use to blow air
to nozzles for both nozzles (figure 51).
INTERLOCK VALVE
Safety precautions are taken in the slide-out
operations to avoid damage to the structure and
possible movement of the vehicle when a slide-
out is not retracted and pins unlocked. A 3-port
2-position normally open valve is connected in
line to the parking brake system and prevents
the conductor from releasing the parking brake
as long as both slide-out are not retracted and
air pressure is not detected in both slide-out pins
by pressure switches (see figure 51 items 17
and 18). This valve is located in the front service
compartment (figure 29). To prevent abnormal
activation of this valve when the vehicle is
moving, a relay is added to power this valve by
the speed switch signal (figure 37).
INTERLOCK
VALVE
POSITIONS
AIR PRESSURE
INLET VALVE
FIGURE
29 :
FRONT SERVICE COMPARTMENT
12.2 PNEUMATIC
INTERCONNECTION WITH
PREVOST VEHICLE
The slide-out pneumatic system air supply
comes from the converter air supply valve
located on the pneumatic panel in the front
service compartment (figure
29). A valve is also
added on this panel for an interlock with the
parking brake. Another valve is added in the
compartment next to the main power
compartment (figure 28). This valve activates the
tag axle unloading when locking or unlocking the
front slide-out.
Pneumatic circuit modifications made on the
vehicle are shown on pneumatic diagrams
annexed.
12.3 MAINTENANCE
COMPRESSED AIR LINE
Inspect all compressed air line tubing for cut,
swelling, kink or other damage or deterioration.
Inspect the pneumatic fittings and components
for any leak. The slide-out air supply is
connected to the accessory air tank and the
maintenance is specified in the "brake and air
R3 23 May 3, 2002