PREVOST LE MIRAGE XLII BUS SHELLS Maintenance Manual Download

Page: 793 / 1260

Section 16: SUSPENSION

PA1564

12.1.5 Expansion Air Tank

Two expansion tanks are located in front
wheelhousing. These air tanks are located
behind secondary and accessory air tank. Also,
six expansion tanks are located near rear air
springs (Fig. 42). Expansion tanks are
connected in series with air springs. Expansion
tanks are used to lower the stiffness of the air
spring. They are provided with a bottom drain
valve.

It is recommended to purge them, with all other
tanks, every 12,500 miles (20 000 km) or once a
year, whichever comes first.

12.2 EMERGENCY FILL VALVES

The vehicle is equipped with two air system
emergency fill valves to supplement the air
system when air pressure is low and engine
cannot be operated.

The rear valve

is located in engine

compartment and accessible from engine R.H.
side door (Fig. 43).

CAUTION

No other point should be used to supply air
system. The maximum allowable air pressure
is 125 psi (860 kPa).

The front valve is located in the front service
compartment close to accessory air filter
(Fig. 44).

These two air valves are fitted with the same
valve stems as standard tires, and can be filled
by any standard external air supply line.

The rear valve will supply air for all systems
(brakes, suspension and accessories) while the
front valve will supply air for accessories only.

CAUTION

Air filled through these two points will pass
through the standard air filtering system
provided by Prévost. Do not fill air through any
other points.

13. HUB UNIT AND SWIVEL ASSEMBLY

13.1 HUB BEARING INSPECTION

An inspection should be made at intervals of
30,000 miles (48 000 km).

•

Apply parking brake, raise wheels off the

ground and support axle on stands. When
the wheels are raised, they should revolve
quite freely without roughness.

•

Place magnetic base of a dial indicator on

brake caliper and position dial indicator stem
against a convenient marked spot on face of
hub flange.

•

With dial indicator in position pull hard but

steadily on hub flange and oscillate at same
time until a steady reading is achieved.

•

Without releasing the pressure, turn bearing

so that dial indicator stem contacts marked
spot and note reading on indicator.

•

Push bearing flange hard and oscillate as

before until a steady reading is achieved.

•

Without releasing the pressure, turn bearing

so that indicator stem again contacts the
marked spot and note new reading on indi-
cator.

•

The difference between readings is the

amount of mounted end play in bearing unit.

•

The mounted end play figure should not

exceed

0.050 mm (0.002”)

for a new

bearing and

0.20 mm (0.008”)

for a bearing

which has been in service.

NOTE

If original bearing unit is re-fitted, and end-float
is measured at 1 mm, with hub not fully
tightened to correct torque, then the retaining
clip within the unit is damaged and a new unit
must be fitted.

PREVOST LE MIRAGE XLII BUS SHELLS, Maintenance Manual

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