PREVOST X3-45 2016, Maintenance Manual

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Section 05: COOLING SYSTEM
Section 05 Updated Sept.2016 X3-45 Commuter PA1593 DOB 2400-2489
17
13.2 MAINTENANCE
1. Clean the fan and related parts with clean
fuel oil and dry them with compressed air. Do
not clean with steam or high-pressure jet.
2. Check the fan blades for cracks or other
damage. Replace the fan if the blades are
cracked or deformed.
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 27: RADIATOR FAN MOUNTING BOLTS
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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 28: RIGHT ANGLE GEARBOX
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14.1 MAINTENANCE
MAINTENANCE
Change the right angle gearbox oil every
100,000 miles. Replace seals at every oil
change.