attachment 2 section i ? technical specifications commuter coach ...

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ATTACHMENT 2
once at any point, including pre-bending and installation. Rigid lines shall be supported consistent with
standard automotive practice. Nylon lines may be grouped and shall be continuously supported.
The compressor discharge line between powerplant and body mounted equipment shall be flexible
convoluted copper or stainless steel line, or may be flexible teflon hose with a braided stainless steel
jacket. Other lines necessary to maintain system reliability shall be flexible teflon hose with a braided
stainless steel jacket. End fittings shall be standard SAE or JIC brass or steel, flanged, reusable, swivel
type fittings. Flexible hoses shall be as short as practicable and individually supported. They shall not
touch one another or any part of the coach except for the supporting grommets. Flexible lines shall be
supported at 2 foot intervals or less. Airlines shall be installed to minimize air leaks. Each coach shall
not leak down more than 6 psi. as indicated on the instrument panel mounted air gauges, within 15
minutes from the point of governor cut-off.
All reservoir supply and delivery airlines shall be sloped toward reservoirs and routed to prevent water
traps. Grommets shall protect the airlines at all points where they pass through understructure
components. Provision shall be made to apply shop air to a convenient location in the engine
compartment and at the front of the coach and shall include a Schrader standard bore valve. The engine
compartment Schrader valve shall be located ahead of a quarter turn valve. Air for the compressor shall
be filtered through the main engine air cleaner system. All air reservoirs shall meet the requirements of
SAE Standard J10 and shall be equipped with clean-out plugs and quarter-turn drain valves. These
valves and any automatic moisture ejector valves shall be protected from road hazards by major
structural members. Reservoirs shall have an internal siphon hose for the drain valve. The air system
shall be protected by a pressure relief valve set at 150 psi and shall be equipped with check valves and
pressure protection valves to assure partial operation in case of line failures.
The main airline check valve located between the air compressor and the first reservoir must be
accessible for maintenance. Means shall be provided to establish the check valve to be in working
order.
A model Bendix AD-IP air dryer shall be provided and installed according to component
manufacturer’s recommendations. The air drier shall be rated at 90 watts. A Bendix Puraguard filter,
shall be provided. The Puraguard filter shall be installed between the air dryer and the wet tank.
Separator shall be within four feet of the air dryer. Inlet air temperature is not to exceed 150 degrees F
from the compressor.
3.6 GENERAL CHASSIS
3.6.1 WHEELS AND TIRES
3.6.1.1 WHEELS
Wheels shall be Alcoa hub piloted polished aluminum wheels with Durabrite coating. All wheels shall
be interchangeable and shall be removable without a puller. Wheels shall be compatible with tires in
size and load-carrying capacity. Front wheels and tires shall be balanced as an assembly. Wheels shall
be capable of accommodating Michelin, Load Range L radial tires. One spare wheel, complete with
mounted tire shall be provided.