Request for proposal contract form for the transit industry
Engine Brake (Commuter Coach)
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- Mounting
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- Hydraulic Systems
Engine Brake (Commuter Coach)The powertrain shall be equipped with an engine brake designed to extend brake lining service life. The application of the engine brake shall cause a smooth blending of both engine brake and service brake function and shall not activate the brake lights Default Brake lights shall not illuminate when the retarder is activated. Alternative Brake lights shall illuminate when the retarder is activated. Default Standard Requirement for Retarder Activation The retarder shall be adjustable within the limits of the powertrain and activated when the brake pedal is depressed. The Agency will work with the OEM/drive system manufacturer to determine retarder performance settings.
Throttle Pedal Activation of the Retarder The retarder shall become partially engaged (approximately one-third of its total application, with a resulting deceleration of no greater than 0.077g) when the throttle pedal is completely released. Maximum retarder shall be achieved when brake pedal is depressed prior to engagement of service brakes, with a maximum resulting deceleration of approximately 0.20g in an empty bus. The resulting decelerations specified include the effects of engine braking, wind resistance and rolling resistance. The thermostatically controlled cooling fan shall be activated when the retarder is engaged and the coolant temperature reaches the maximum operating temperature established by the engine and transmission manufacturers. Default Accessible Retarder Disable Switch The retarder disable switch shall be accessible to the seated driver.
Retarder Disable Switch Not Accessible The retarder disable switch is not required to be accessible to the seated driver.
Disabling retarder shall be recorded for Agency data collection. Alternative Unless specified by the transmission manufacturer, a retarder disable switch will not be supplied. MountingAll power plant mounting shall be mechanically isolated to minimize transfer of vibration to the body structure and provide a minimum clearance of 0.75 in. Mounts shall control the movement of the power plant so as not to affect performance of belt-driven accessories or cause strain in piping and wiring connections to the power plant. ServiceThe propulsion system shall be arranged for ease of access and maintenance. The Contractor shall list all special tools, fixtures or facility requirements recommended for servicing. The muffler, exhaust system, air cleaner, air compressor, starter, alternator, radiator, all accessories and any other component requiring service or replacement shall be easily removable and independent of the engine and transmission removal. An engine oil pressure gauge and coolant temperature gauge shall be provided in the engine compartment. These gauges shall be easily read during service and mounted in an area where they shall not be damaged during minor or major repairs. An air cleaner with a dry filter element and a graduated air filter restriction indicator shall be provided. The location of the air intake system shall be designed to minimize the entry of dust and debris and to maximize the life of the air filter. The engine air duct shall be designed to minimize the entry of water into the air intake system. Drainage provisions shall be included to allow any water/moisture to drain prior to entry into the air filter. Default Engine oil and the radiator filler caps shall be hinged to the filler neck and closed with spring pressure or positive locks to prevent leakage. All fluid fill locations shall be properly labeled to help ensure that correct fluid is added. All fillers shall be easily accessible with standard funnels, pour spouts and automatic dispensing equipment. All lubricant sumps shall be fitted with magnetic-type drain plugs or magnets in pan. Alternative Unique Fluid (Lubricant) Fillers The engine, transmission and hydraulic reservoir shall each incorporate a unique lubricant fill fitting to prevent cross-contamination of lubricant types. Fitting types shall be specified by the Agency. The engine and transmission shall be equipped with sufficient heavy-duty fuel and oil filters for efficient operation and to protect the engine and transmission between scheduled filter changes. All filters shall be easily accessible, and the filter bases shall be plumbed to ensure correct reinstallation. Default No engine bypass oil filter. Alternative Centrifugal, non-disposable engine bypass oil filter. Default Engine Oil Pressure and Coolant Temperature Display Engine oil pressure and coolant temperature gauges required in engine compartment.
Oil Pressure and Coolant Temperature Display No engine oil pressure and coolant temperature gauges required in engine compartment.
The hydraulic system shall operate within the allowable temperature range as specified by the lubricant manufacturer. Default No requirement for hydraulic system sensors. Alternative Hydraulic System Sensors Sensors in the main hydraulic system, excluding those in the power steering system, shall indicate on the driver’s on-board diagnostic panel conditions of low hydraulic fluid level.
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