PREVOST LE MIRAGE XLII BUS SHELLS User Manual

Section 05: COOLING SYSTEM
PA1553
14
FIGURE 14: THERMOSTAT AND RELATED PARTS 05034
11. FAN GEARBOX
The radiator fan is belt driven from the engine
crankshaft pulley through a standard gearbox,
which is designed with two output shafts.
FIGURE 15: FAN GEARBOX 05062
11.1 MAINTENANCE
Change the gearbox oil at 3,000 miles (4,800
km) and subsequently every 50,000 miles
(80,000-km) or once a year, whichever comes
first.
11.2 OIL CHANGE
1. Stop engine and make sure that all engine
safety precautions have been observed.
2. Remove the drain plug located underneath
the gearbox case.
3. Drain gearbox.
4. Replace drain plug.
5. Remove the dipstick located on top of
gearbox and wipe with a clean rag (Fig. 15).
6. Adjust level to ″Full″ mark using Mobil SHC
630 (Prévost #180217) synthetic oil.
7. Insert dipstick in gearbox case, then remove
again to check mark.
8. Reinsert the dipstick.
12. RADIATOR FAN BELT REPLACEMENT
Locate the belt tensioner pressure-releasing
valve (Fig. 16), then turn handle counter-
clockwise in order to release pressure in belt
tensioner air bellows, thus releasing tension on
belts.
Remove existing belts (3″V″belts & 1 Poly) from
fan assembly and replace with new ones.
Turn the pressure-releasing valve clockwise to
its initial position to apply tension on the new
belts.
NOTE
For proper operation of the belts, adjust the
air bellows tensioner pressure regulating
valve (located next to control valve) to 45 psi
(310 kPa).
12.1 BELT TENSION ADJUSTMENT
The regulator is located in the engine
compartment behind the belt tension pressure
releasing valve panel. Turn the screw located
under the regulator assembly to change the
tension pressure. Check proper pressure using
the pressure check valve (Fig. 16).
Use Belt Tension Gauge #68-2404 to measure
tension of engine belts. For proper operation of
air tensioners, adjust upper tensioning bracket
to provide a ¼" (7 mm) gap between stopper
and bracket under normal pressure of 45 psi -
310 kPa. Refer to figure 16 for more information.

PREVOST LE MIRAGE XLII BUS SHELLS Specifications

General

Brand	PREVOST
Model	LE MIRAGE XLII BUS SHELLS
Category	Buses
Language	English