Specifications

December 2013
REQUEST FOR PROPOSALS FOR
PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES
RFP SRTA-2014-01
TECHNICAL SPECIFICATIONS
PAGE-18
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control function. The transmission electronic module shall be capable of
communicating with the engine electronic module to maintain maximum
efficiency.
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b. The gear selector shall be totally electronic with touch-sensitive pads compatible
with transmission, located on left side console, and Voith approved, or approved
equal.
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c. Transmission engine interlock switch will be provided so coach cannot be shut
off while in gear. A starter lockout switch shall be provided that shall sense
transmission gear changes. Starter motor shall be energized only with the
transmission in the neutral position
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d. A waterproof back-up light switch shall be provided on the transmission to
energize the back-up lights and de-energize the interior lights with transmission
in reverse and master switch in the "RUN" or "NIGHT" position.
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e. The transmission retarder shall be controlled by brake activated air pressure
switches. The final retarder control design will be discussed and approved at the
pre-manufacturing meeting.
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f. The system will incorporate various sensors which feed information regarding the
shift selection, oil temperature, pressure, etc.
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g. The Operator will be provided with a "Check Transmission" and/or a "Do Not
Shift" light and alarm located at the Operator's dash board.
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h. The electronic controls shall be equipped with a self-diagnostic system as well as
transmission protection. A failure shall be retained by the control unit for
evaluation by garage personnel by using a diagnostic reader.
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i. Plug-ins for the reader shall be through the same two (2) plug outlets as listed
under Section 11.2.g "Engine Protection." If separate plugs are required, they
shall be mounted in the same two locations as specified for the engine controls,
unless an alternate location is approved by the SRTA.
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11.12 Propellor Shaft and Driveline
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a. Propeller shaft shall be a Dana 1710 series, or approved equal,. It shall have a
minimum diameter of four inches (4") and shall be constructed of steel. The
universal joints shall be heavy duty. Shaft shall have a protector guard.
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b. A slip joint shall be placed at the transmission to compensate for vertical
movement at the rear axle. Lubrication fittings shall be provided for the universal
bearings and slip joint splines.
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12. COOLING SYSTEM
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12.1 Engine Cooling
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The engine shall be cooled by a water-based, pressure type, cooling system that does not permit
boiling or coolant loss during the operations described above. Engine thermostats shall be easily
accessible for replacement. Shutoff valves shall allow filter replacement without coolant loss. Valves
shall permit complete shutoff of lines for the heating and defroster units, and water booster pumps.
The water boost pump shall be a long life brushless design. All low points in the water-based cooling