PREVOST H3-41 Maintenance Manual page 738

SECTION 18b: X3 SERIES BODY
9.2.3 Roof Escape Hatch
The vehicle can be equipped with one or two
escape hatches. The escape hatch is designed
to provide years of reliable service with a
minimum of maintenance. All components are
rust proof, and moving parts are Teflon coated to
eliminate need for lubrication. Should water
infiltrate the vehicle from the escape hatch, refer
to the heading "Sealing" in this paragraph for
procedures on how to seal this area.
CAUTION
Use of lubricants, paints, or other coatings
such as graffiti deterring sprays is not
recommended.
Suggested maintenance
inspection of fasteners for evidence of loosening
due to tampering, and regular cleaning with mild
soap and water.
Although there are other cleaning solutions
available, some contain solvents and other
chemicals that can attack the high strength
materials used in the production of the escape
hatch.
CAUTION
Ensure that cleaning solutions are compatible
with the materials used on the escape hatch.
Graffiti removing cleaners often contain acetone,
ether, lacquer thinner or other solvents known to
destroy the high strength properties of many
plastics. Use of these cleaners must be avoided.
Graffiti-resisting coatings often leave a sticky
residue that interferes with smooth up/down
movement of the hatch mechanism. Some of
these coatings also contain solvents that will
reduce the strength of certain components.
CAUTION
Use of these coatings is at considerable risk
and should be avoided.
Repair
•
All components used in the production of the
escape hatch are available as service parts,
except for one hinge that represents a possible
hazard when improperly reattached to a hidden
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PA1621 Maintenance Manual All Series | Revised Sept 2019
includes periodic
tapping plate, itself often damaged whenever the
hinge is damaged. The tapping plate is
permanently laminated between the inner and
outer cover assemblies, and it cannot be
inspected or replaced. It is therefore necessary
to replace the entire assembly following damage
to the hinge. See Figure 43.
CAUTION
Hinge assembly is critical and hinge should
never be removed from cover assembly.
Fasteners used in this assembly are special
and have critical torque requirements and
tamper-resistant heads
tampering.
Sealing
•
1. Open and tilt up the escape hatch cover.
2. Join the 2 ends of the rubber seal.
CAUTION
Seal joint should be toward rear of vehicle.
3. Apply rubber adhesive CA-40 (Prevost #
681285) in the gap between the seal ends.
4. Apply Sikaflex 221 sealant (Prevost #
680532) along the outline of the escape
hatch on the roof of vehicle.
FIGURE 43: ESCAPE HATCH
Escape Hatch Panel Assembly
•
The frame of the escape hatch is riveted to the
roof of the vehicle. The escape hatch panel
assembly can be replaced as a unit and a new
panel assembly installed in the existing frame.
to discourage
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