Specifications

REQUEST FOR PROPOSALS FOR
PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES
RFP SRTA-2014-01
TECHNICAL SPECIFICATIONS
PAGE-7
December 2013
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c. Except as noted below, the entire body lower frame assembly, cab, underbody,
understructure/frame, chassis, fenders, wheelhousings, and lower skirt panels shall be
completely undercoated with a silver or light grey colored undercoating.
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d. Undercoating shall be composed of a non-volatile/non-flammable resin-type base, grit
and abrasive free material, dispersed in a petroleum solvent, providing a homogenous
formulation, MIL-TD specification grade undercoating material. Undercoating shall be
applied to a uniform thickness throughout with no bare spots. Bidder shall indicate
methods to be used in meeting this requirement.
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e. Items and components that shall not be undercoated include non-metallic fender and
stepwells, engine, transmission, driveshaft(s), differential/axle housing, brakes, lube
fittings, exhaust system, and power steering heat shields.
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8. UNDERCARRIAGE
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Both front and rear axles shall have the load rating for the gross loads equal to or greater than
the coach builder requires them to carry. The gross load shall include curb weight plus seated
and standee passengers with the average weight of each passenger to be 150 pounds. Front and
rear axles for the coaches shall have the highest GVWR capacity available. Front and rear hubs
shall be of steel construction.
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8.1 Front Axle
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a. Front axle shall be a Rockwell – Meritor, or approved equal, heavy-duty
standard axle designed with proper wheel and axle geometry so that imperfect
front axle operation will not be encountered in service.
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b. Front axle shall be 14,600 lbs., minimum rating or be rated for the loads the bus
builder’s design requires.
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c. Wheel bearings shall utilize oil seal type lubrication.
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8.2 Rear Axle
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a. Rear axle shall be a Rockwell – Merito, or approved eq u a l , standard
single reduction axle with a minimum rated capacity of 26,000 lbs (21,000 lbs for
30 foot coach).
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b. The rear axle shall be a heavy-duty, full floating type, Meritor Standard,
incorporating a spiral bevel drive, or approved equal. The axle housing shall be a
steel stamping and located to the roadside of the axle center. The load tubes
shall be fixed and the wheel bearings oil lubricated. The housing drain plug shall
be magnetic.
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c. The differential carrier shall incorporate the differential assembly, drive pinion
and pinion cage. Carrier shall be removable as a complete unit from the axle
housing.
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d. The four (4) pinion differential gears shall be carried in a two-piece case mounted
on tapered roller bearings. Torque nuts and bolts are used to mount the dowel
gear drive to the flanged half of the differential case.