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DRIVER'S HANDBOOK
DOOR ADJUSTMENT & LUBRICATION
Maintenance procedures for entrance doors must be performed by qualified techni-
cians at intervals of one month or 1,000 miles, whichever occurs first.
Continuing Maintenance Requirements
• Keep working parts of control tightened.
• Lubricate all working parts periodically, including hinges and overhead con-
trols.
• Repair or replace worn seals.
• Maintain proper door opening and closing adjustment.
Outward Opening Door Adjustment
Outward Opening Doors are mounted in a prefabricated framework, which elimi-
nates the effect of body construction variations on door and seal operation. Doors
are suspended completely on sealed ball bearings located at the top corners of the
framework, inside the body. The interlink connection between the doors is a single
assembly with oppositely threaded, spherical bearing rod end connectors at each
end, providing simple link length adjustment without disassembly. Loosen the lock
nut, turn the tube, and retighten the nut when satisfactorily adjusted. The geometry
of the mechanical link between the doors causes the rear door to close well ahead
of the front door, so that the front nosing seal rubber always overlaps the rear. Oil
impregnated bronze bearings in the lower corners of the framework serve as pivots
(not supports). All controls and mechanisms and the complete lower step tread are
sealed inside the bus and out of the weather when the door is closed.
Outward Opening (Air Powered) Adjustment
The pneumatic actuator is a cylinder connected to a lever on each door, located in-
side the header cover. An interconnecting link between the doors controls the opera-
tion sequence. A safety release valve is located over the door. Air switches inside the
header cover operate Stepwell lights. A two way manually operated valve manages
the driver's door control. Air pressure holds the door either open or closed, depend-
ing upon the position of that valve. The operation speed is adjustable by use of flow
control valves located on the actuator.
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