MCi Crusader II 1989 Maintenance Manual page 99

Date
1-1-89
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MC-9 MAINTENANCE MANUAL
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Figure
3-20.
Emergency
Escape
Hatch.
EMERGENCY ESCAPE HATCHES
Two emergency escape hatches are located in the roof,
opening size approximately 18" x 25" (457 x 635 mm). To
open in case of emergency, pull handle fully to unlock and
push hatch open. See figure 3-20. To close, pull hatch down
with handle in open position, then push handle to lock hatch.
For ventilation. the hatch may be partially opened as above.
then held by engaging the spring and prop mechanism .. From
this position. upward pressure on the hatch will release spring
engagement and allow hatch to be fully opened. If hatch is to be
closed from a partially open position. the prop must be disen-
gaged by either opening the hatch until prop is freed or by
pivoting the prop arm out of the open end of spring.
ADJUSTMENT
The emergency escape hatch in the roof can be checked
and adjusted for correct hatch sealing as follows:
1.
Open the emergency hatch and examine the surface of
the rubber seal surrounding the hatch opening. An impression
should be seen in the rubber where the sealing lip of the hatch
has made contact. If the impression shows as a continuous
unbroken line, the sealing is good and requires no adjustment
2. If the line runs off the rubber across the forward edge, the
hatch must be adjusted back toward the rear of the coach. This
can be done by loosening the catch retaining bolts on both
sides of the hatch opening and moving the catches back the
required amount.
3. Close and then open the hatch to check the seal to deter-
mine if the hatch is centered; readjust if necessary. To obtain a
clear impression of where the lip of the hatch contacts the
rubber seal. it may help to chalk the edge of the lip.
NOTE: If additional forward or rearward
adjustment is required,
it may be necessary
to remove the catches and elongate the
slotted holes. If the line runs off the rear
edge of the rubber seal when checking as
above, the hatch must be adjusted forward.
ENTRANCE DOOR
DESCRIPTION
A manually operated, sedan type entrance door is provided
ahead of the front axle on the right side of the coach. A handle
on top of the dash convenient to the driver provides over-
center control for both open and closed positions. Positive
automatic air lock with overrule is also provided. The air lock is
automatically actuated by a microswitch at the over-center
position when door is closed. A plunger release with provision
for padlock is provided at the front of coach.
The door is constructed of a welded stainless steel frame
with a stainless steel beaded panel riveted on the outside. A
vinyl-clad aluminum panel is used on the inside of the door
with a stainless steel kick panel on lower portion. Stainless
steel snap-on moldings cover all panel joints and the perime-
ter. A sturdy hinge casting is used attop and a·powder-coated
hinge casting with chrome self-aligning ball bearing is used at
the bottom of the door. The sash is a one-piece, fixed type in a
black anodized aluminum extruded frame with double glazing.
Clear door opening is 30" (760 mm) wide x 84%" (2,150 mm)
high.
The door is held in the closed position during coach opera-
tion by an air cylinder-operated locking mechanism. A single-
acting air cylinder is used, having a return spring in the cy-
linder body. The air cylinder is controlled by an electrically
operated valve which is energized by a microswitch located
in the manual door control mechanism.
With the entrance door in the closed position, the micro-
switch is closed, energizing the air valve and loading the door
lock cylinder. The cylinder moves the door lock in a position
which engages a latch on the entrance door, holding the door
positively closed.
To open the door, initial movement of the door operating
handle opens the microswitch, de-energizing the air valve and
venting the cylinder. The" action of the return spring in the
cylinder moves the door lock away fr.om the latch. Further
movement of the door control handle opens the door. Addi-
tional leverage is provided by an optional door control handle
which is 1 ¼" longer than the standard handle.
An adjustment is provided at the microswitch in the event
that this unit requires replacement. The microswitch is located
under the dash directly beneath the door control handle. The
correct adjustment is obtained when the microswitch contacts
close as the door control mechanism begins to pass center
during closing of the door.
An overrule switch, which opens the air valve circuit re-
gardless of the positio11 of the microswitch, is provided under
the dash at the operator's position. This is designed for use in
emergencies or when the door control system does notfunc-
tion properly.
ADJUSTMENTS
Provisions are made for the height adjustment of the
entrance door by means of a threaded shaft on the upper hinge