PREVOST H3-41 Maintenance Manual page 145

WARNING
Cooling fans may start when the engine is
shut down in the following conditions:
• If a High Exhaust Temperature condition
exists (e.g. following regeneration).
• During "Motor Test" sequence.
MAINTENANCE
Inspect fan blades regularly, check for dirt or
grime accumulations on the blade that could
cause vibrations, clean as necessary using
water and regular strength degreaser.
Check for cracks and signs of abrasion on the
blades that could indicate contact with debris or
obstruction during operation.
Check the bottom of the shroud cover and
remove debris that could have accumulated. In
sub-zero winter area, also check for snow and
ice accumulation that could block the fan
blades rotation.
Open the fan shroud as necessary (remove top
and bottom hex screws shown below) to
facilitate cleaning and debris removal.
NOTE
Electric cooling fan motors are sealed and
certified IP6K9K and IP68.They can therefore
be safely power/pressure washed.
NOTE
To prevent a situation where debris would stick
to the radiator door (due to fans suction force)
and prevent full cooling performance, all fans
are forced to stop for a period of 25 sec. every
30 minutes.
NOTE
To keep area between fans and shroud cover
clean and, in winter, prevent snow and ice
accumulation, a cleaning sequence, where the
fans will run at full reverse speed for 30 sec.
will take place the first time the vehicle
reaches 30 km/h (19 mph) after start-up.
A winter cleaning mode will also take place if
exterior temperature drops below 0°C (32°F)
and will activate the fans at full reverse speed
for 30 sec every 30 min.
Fans are factory balanced by the use of small
metal weight clipped to the fan blades, to
avoid
operation, do not remove, shift or interchange
balancing weights.
PA1621 Maintenance Manual All Series
SECTION 05: COOLING SYSTEM
CAUTION
damaging vibrations
|
Section 05 revised Feb 2019
during fan
25