Maintenance; Inspection; Fan Removal / Installation; Fan Right Angle Gearbox - PREVOST H3-41 Maintenance Manual

SECTION 05a: H3 SERIES COOLING SYSTEM
FIGURE 40: MECHANICAL LOCKING
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 drive mechanism 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
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

WARNING
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 right angle gearbox.
• Visually inspect fan driving mechanism, fan
blade assembly,
surrounding area for evidence of contact
between rotating and non-rotating parts.
PA1615 Maintenance Manual All Series | Section 05a revised September 2016
26
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involving driving
shroud, radiator, and
• 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 right angle gearbox shaft
flange. 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 flange, 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 (finger tight).
•
Finally, take the 2 bolts that were used as
guide pins and screw them back in on the
proper side of the fan. Tighten in a star
pattern.
TORQUE: 32 lb-ft (43 Nm)
FIGURE 41: RADIATOR FAN MOUNTING BOLTS
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 clutch and right angle gearbox
assembly.
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