Section 05: COOLING SYSTEM
PA1562
19
3. Remove any rust or rough spots in the
grooves of the fan pulley. If the grooves are
damaged or severely worn, replace the
pulley.
4. Do not restrict fan rotation during engine
operation for any reason.
5. Do not operate fan-driving mechanism with a
damaged fan assembly. Replace a damaged
fan as soon as the fault is noted.
6. Immediately investigate and correct any
operator complaint involving driving
mechanism or cooling system performance.
7. When questions arise, obtain answers before
proceeding. Assistance is available through
the Prevost After-Sales Service Support
serving your area.
13.3 INSPECTION
DANGER
Set the starter selector switch in engine
compartment to the "Off" position to prevent
accidental starting of the engine.
• Check security of fasteners securing fan
blade assembly to fan clutch.
• Visually inspect fan driving mechanism, fan
blade assembly, shroud, radiator, and
surrounding area for evidence of contact
between rotating and non-rotating parts.
• Check drive belt for fraying, cracking, and
proper tension.
• Turn fan through at least 360° of rotation. It
should turn smoothly with no resistance.
13.4 FAN REMOVAL / INSTALLATION
The fan is bolted to the magnetic clutch. To
remove the fan:
• Unscrew and remove the mounting bolts
and washers.
To reinstall the fan:
• If the fan is still in the radiator fan shroud,
place 2 of the mounting bolts on the
opposite side of the clutch, in reverse
direction, in order to use them as guide pins
to position the fan.
• Once properly positioned, screw the 4
remaining bolts back in and tighten properly
(16 lbf-ft; 22 Nm).
• Finally, take the 2 bolts that were used as
guide pins and screw them back in on the
proper side of the clutch and tighten
properly.
FIGURE 25: RADIATOR FAN MOUNTING BOLTS 05125
14. FAN RIGHT ANGLE GEARBOX
The radiator fan is belt driven from the engine
crankshaft pulley through a drive belt, a
universal joint shaft, a right angle gear and
clutch assembly.
FIGURE 26: RIGHT ANGLE GEARBOX 05118
14.1 MAINTENANCE
MAINTENANCE
Change the right angle gearbox oil every
50,000 miles (80,000-km) or once a year,
whichever comes first.
Use Synthetic Gear Lubricant SAE 75W-90.
14.2 OIL CHANGE
1. Stop engine and make sure that all engine
safety precautions have been observed.
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