Standard Bus Procurement Guidelines - APTAStandards.com
Standard Bus Procurement Guidelines - APTAStandards.com
Standard Bus Procurement Guidelines - APTAStandards.com
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<strong>Standard</strong> <strong>Bus</strong> <strong>Procurement</strong> <strong>Guidelines</strong><br />
with the bus on a hoist. Each element requiring lubrication shall have its own grease fitting with a relief<br />
path. Lubricant specified shall be standard for all elements on the bus serviced by standard fittings.<br />
5.3.1.2.4 KNEELING<br />
A kneeling system shall lower the bus a minimum of 3 inches during loading or unloading operations<br />
regardless of load up to GVWR, measured at the longitudinal centerline of the front door, by the driver<br />
using a three position, spring loaded to center switch. Downward direction will lower the bus. Release<br />
of switch at anytime will <strong>com</strong>pletely stop lowering motion and hold height of the bus at that position.<br />
Upward direction of the switch will allow the system to go to floor height without the driver having to<br />
hold the switch up.<br />
Brake and Throttle interlock shall prevent movement when the bus is kneeled. The kneel control shall<br />
be disabled when the bus is in motion. The bus shall kneel at a maximum rate of 1.25 inches per second<br />
at essentially a constant rate. After kneeling, the bus shall rise within 2 seconds to a height permitting<br />
the bus to resume service and shall rise to the correct operating height within 7 seconds regardless of<br />
load up to GVWR. During the lowering and raising operation, the maximum acceleration shall not<br />
exceed 0.2g and the jerk shall not exceed 0.3g/sec measured on the front door step tread.<br />
An indicator visible to the driver shall be illuminated until the bus is raised to a height adequate for safe<br />
street travel. An audible warning alarm will sound simultaneously with the operation of the kneeler to<br />
alert passengers and bystanders. A warning light mounted near the curbside of the front door, minimum<br />
3" diameter, amber lens shall be provided that will blink when kneel feature activated and throughout<br />
operation. Kneeling shall not be operational while the wheelchair lift is deployed.<br />
5.3.1.3 WHEELS AND TIRES<br />
5.3.1.3.1 WHEELS<br />
Wheels and rims shall be (procuring agency to specify hub or stud piloted, and whether with aluminum<br />
rims) and shall be integral formed steel drop center construction. All wheels shall be interchangeable<br />
and shall be removable without a puller. Wheels shall be <strong>com</strong>patible with tires in size and load-carrying<br />
capacity. Front wheels and tires shall be balanced as an assembly per SAE J1986.<br />
5.3.1.3.2 TIRES<br />
Tires shall be suitable for the conditions of transit service and sustained operation at the maximum speed<br />
capability of the bus. Load on any tire at GVWR shall not exceed the tire supplier's rating. (Procuring<br />
agency to describe arrangements for furnishing tires from lessor or supplier.)<br />
5.3.2 STEERING<br />
5.3.2.1 FRONT AXLE<br />
The front axle shall be non-driving with a load rating sufficient for the bus loaded to GVWR and shall be<br />
equipped with grease type front wheel bearings and seals. All friction points on the front axle shall be<br />
Technical Specifications 143 10/18/07