Apta (Draft) Specification For: 30-ft, 35-ft, 40-ft, 45-ft, 60-foot (articulated) Transit Buses
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- IP 13.Mounting
- 13.1Service
- 13.2Accessories
- IP 14.Hydraulic systems
IP 12.RetarderThe powertrain shall be equipped with a retarder designed to extend brake lining service life. The application of the retarder shall cause a smooth blending of both retarder and service brake function. Actuation of ABS and/or Automatic Traction Control (ATC) shall override the operation of the brake retarder. Alternative Brake lights shall illuminate when the retarder is activated. Default
The retarder shall be adjustable within the limits of the powertrain and activated when the brake pedal is depressed. The procuring agency will work with the OEM/drive system manufacturer to determine retarder performance settings. Alternative
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. Alternative
The retarder disable switch is not required to be accessible to the seated driver. Alternative
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. Alternative
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 procuring 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 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 air filter. Alternative
No engine oil pressure and coolant temperature gauges required in engine compartment. 13.2AccessoriesEngine-driven accessories shall be mounted for quick removal and repair. Accessory drive systems shall be maintained in accordance with the manufacturer’s requirements. These accessories shall be driven at speeds sufficient to ensure adequate system performance during extended periods of idle operation and low route speed portions of the design operating profile. Belt guards shall be provided as required for safety and shall be sturdy in design and installation and easily removable. Accessories may be driven directly by the engine, electrically or hydraulically. alternative Direct-driven engine accessories Alternative Electrically powered accessories Electrically powered accessories shall be provided. Contractor shall provide a list of these accessories to the procuring agency. IP 14.Hydraulic systemsHydraulic system service tasks shall be minimized and scheduled no more frequently than those of other major coach systems. All elements of the hydraulic system shall be easily accessible for service or unit replacement. Critical points in the hydraulic system shall be fitted with service ports so that portable diagnostic equipment may be connected or sensors for an off-board diagnostic system permanently attached to monitor system operation when applicable. A tamper-proof priority system shall prevent the loss of power steering during operation of the bus if other devices are also powered by the hydraulic system. The hydraulic system shall operate within the allowable temperature range as specified by the lubricant manufacturer. Default
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. Directory: swc swc -> Packet Tracer Configure Initial Router Settings (Instructor Version) Instructor Note swc -> Chapter 50 Aircraft swc -> Conservation Security Program swc -> Click on enter the exhibition swc -> Southwest Christian – Tinley Park Invitational Meet Boys Cross Country Race Friday, September 30, 2016 Cool and Cloudy – 60 Degrees swc -> Date: October 28 – December 5, 2003 Project Website swc -> Publication and presentation log swc -> Ncdmf chpp chapter Shell bottom Ecological Role and Functions Ecosystem enhancement swc -> Directions: use the map in Download 0.56 Mb. Share with your friends:
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