SECTION 18: BODY
24
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
FIGURE 18: APPLICATION 0F SIKA 221 BLACK
Reinstall center post and interior finish-
ing panels.
Clean windshield surface of butyl resi-
due.
15.1.6 BI-FOLD ENTRANCE DOOR
An air operated “bi-fold type” entrance door, with
an air door cylinder and damper assembly
installed under the right hand dash for the R.H.
door panel opening. Another air door cylinder is
installed behind the wall to the right of the first
curb-side passengers’ seat for the L.H. door
panel opening. The opening and closing door
speed cycle is adjustable by a damper mounted
in parallel with the R.H. door panel cylinder on
the door hinge. Door activation is controlled by a
panel (Figure 19), located near the defroster and
wiper motors. The accessory air reservoir
supplies air to this system.
FIGURE 19: ENTRANCE DOOR & WIPER CONTROL
PANEL
06619
The door is held in the closed position during
coach operation by a two air cylinder locking
mechanisms (Figure 20).
FIGURE 20: ENTRANCE DOOR - VIEW FROM INSIDE
Air cylinders with return spring in the cylinder
body are used. Air cylinders are controlled by an
electrically operated solenoid valve energized by
a multiplex module located under the right hand
dashboard.
To open the door, initial action from multiplex
module output energizes the air lock solenoid
valve, venting the door locking cylinders. The
return locking spring pulls the door lock away
from the latch, unlocking the door. Door
movement starts only when pressure in the
central air door lock is below 10 psi. The “air
cylinder open solenoid valve” opens and allows
air to flow to the door cylinders, “the air cylinder
close solenoid valve” exhausts air from the rod
side of the cylinders.
To close the door, initial movement of the switch
energizes the “air cylinder close solenoid valve”
and air flows to the cylinders by their rod side
ports. The “air cylinder open solenoid valve”
exhausts air from cylinders. When the sensor
signals the door as closed, the air lock solenoid
valve is de-energized and loads the door lock
cylinders. The cylinder moves the door lock in a
