Hoses; Hose Clamps On Coolant Lines - PREVOST H3-41 Maintenance Manual

8. Gently scrape by hand and remove any loose
debris or corrosion from the spindle and
coolant filter housing using an abrasive
cleaning pad (Figure 8).
Note: Do not allow any corrosion or solid
contaminants to fall into the filter housing.
Note: When cleaning is required DO NOT use
power tools or grinders to clean the areas
covered with corrosion. This could damage the
parts beyond repair.
Note: Inspect the O-ring (4) in the spindle (2) for
damaged due to corrosion or during removal.
Replace the O-ring using part number 968725 if
needed. Replace the spindle using part number
3979940 if needed.
FIGURE 8: INSPECT THE O-RING (4) IN THE SPINDLE
(2)
9. If the area containing corrosion cannot be
reliably cleaned or there is damage to the
sealing surface for the O-ring, the coolant
filter housing must be replaced.
10. Apply grade NLGI
grease to the grooved area of the spindle.
Ensure the grooved area of the spindle is
filled as completely as possible.
FIGURE 9: APPLY GRADE NLGI NO.2 SILICONE-BASED
GREASE TO THE GROOVED AREA
No.2 silicone-based
PA1621 Maintenance Manual All Series
SECTION 05: COOLING SYSTEM
11. Reinsert the spindle (2) into the coolant filter
housing (3) and tighten the M5 hex socket
screw (1).
12. To prevent reoccurrences, at a minimum, the
grease should be repacked in this area when
the coolant is changed, and the valve should
be rotated periodically.
FIGURE 10: INSERTING THE SPINDLE
13. Fill the cooling system with the recommended
coolant.
14. Set the engine stop/ignition interlock back to
the normal position.
15. Start the engine, check for leaks and proper
operation.
16. After shutdown,
necessary.
4.

HOSES

Rotten, swollen, and worn out hoses or loose
connections are frequent causes of cooling
system problems.
Serious overheating is often caused by an old
hose collapsing or from rotten rubber shedding
from hoses and clogging the coolant passages.
Connections should be inspected periodically
and hose clamps tightened. Replace any hose
found to be cracked or swollen.
4.1

HOSE CLAMPS ON COOLANT LINES

All hose clamps used for the heating and cooling
systems have a spring function (spring in the
housing) to compensate
expansion/contraction
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Section 05 revised Feb 2019
replenish coolant as
for the normal
of hose and metal
11