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Crusader
MC-8
[ , . 0 ,
3-23
the coach. The door is held in the closed position
during coach operation by an air cylinder-operated
locking mechanism. A single-acting air cylinder is
used, having a return spring in the cylinder body. The
air cylinder is controlled by an electrically operated
valve which is energized by a micro-switch located in
the manual door control mechanism.
With the entrance door in the closed position, the
micro-switch is closed, energizing the au 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
qandle
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 from the latch. Further movement of
the door control handle opens the door.
An adjustment is provided at the micro-switch in
the event that this unit requires replacement. The
micro-switch is located under the dash directly
beneath the door control handle. The correct ad-
justment is obtained when the micro-switch contacts
close as the door control mechanism begins to pass
center during closing of the door.
An overrule switch, which opens the air valve cir-
cuit regardless of the position of the micro-switch is
provided under the dash at the operator's position.
This is designed for use in emergencies or when the
door control system does no\ function properly.
ADJUSTMENTS
CONTROL ROD: The entrance door control rod
may be adjusted by a locked type turnbuckle. Turn-
buckle is accessible by an access door at the top right
hand side of dash. Tighten nuts after desired ad-
justment is obtained.
If
further adjustments are necessary, remove target
panel at front below windshields, the jam nut at
unibal end can be loosened and adjustments can be
made by turning unibal end in or out as required. To
retighten jam nut, it may be necessary to use a vice-
grip or a pipe wrench to hold control rod from tur-
ning.
CAUTION: Control rod bend at unibal end must
point toward rear of coach when adjustment is com-
pleted.
CONTROL HANDLE: The open-lock and closed-
lock positions can be adjusted. Viewing linkage from
underside of dash, proceed as follows:
I. Loosen jam nuts on stop screws protruding from
the control handle lever.
2.
Turn stop screws in or out to desired setting.
3. Tighten jam nut and check adjustment by moving
control handle from open lock to closed lock
positions.
Properly adjusted mechanism will swing over cen-
ter and lock door firmly in both fully-open or closed
positions.
MICRO-SWITCH: This can be adjusted if it does
not energize or de-energize at correct times. The
mounting bracket of the switch has slotted holes
allowing it to be moved backward or forward. By
MAINTENANCE
0
,,,_~ember, 1973 ]
MANUAL
loosening the mounting bolts, the bracket and switch
can be set to a position where it will energize at
correct position of lever and entrance door.
CAUTION: Switch must energize when entrance
door is fully closed.
If
switch is set too far forward, it
would energize and actuate the solenoid valve which
in turn controls the air cylinder before the door is
fully closed.
If
switch is set too far back, it would
energize and actuate the solenoid valve, the air cylin-
der would not be actuated and the door would not
lock.
DOOR CONTROL SOLENOID -
VALVE
DESCRIPTION
The door control solenoid valve located in the
spare tire compartment controls the supply of air to
the door lock cylinder.
DISASSEMBLY
I.
2.
3.
Shut off pressure to the valve and electric
current.
Remove nut at top of coil cover. Cap, coil
housing and coil can then be removed from body.
Using wrench unscrew the sleeve assembly from
the body. DO NOT use a pipe wrench, as a
wrench may crush the sleeve assembly and make
the valve inoperative.
l. Entrance Door Solenoid
Valve Installed
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