attachment 2 section i ? technical specifications commuter coach ...

3.3.5 DAMPING
Page 44
ATTACHMENT 2
Vertical damping of the suspension system shall be accomplished by hydraulic shock absorbers
mounted to the suspension arms or axles and attached to an appropriate location on the chassis.
Damping shall be sufficient to control coach motion to 4 cycles or less after hitting road perturbations.
Shock absorbers shall maintain their effectiveness for at least 50,000 miles in normal service. The
coach shall be equipped with four shock absorbers on the drive axle and two on each side of the front
axle and one on each end of the tag. Shock absorbers shall be interchangeable on each axle, side to
side.
3.3.6 LUBRICATION
All elements of steering, suspension, and drive systems requiring scheduled lubrication shall be
provided with grease fittings conforming to SAE Standard J534. These fittings shall be located for ease
of inspection, and shall be accessible with a standard grease gun without flexible hose end from a pit or
with the coach on a hoist. Each element requiring lubrication shall have its own grease fitting with a
relief path. Lubricant specified shall be standard for all elements on the coach serviced by standard
fittings. All fittings shall be standard pipe thread.
3.3.7 UNDERCOATING
Tectyl 127CG undercoating shall be applied to the underside of the body, frame, and wheelwells.
Undercoating overspray on the exterior of the coach shall be removed prior to delivery. Underbody
components such as air suspension bellows and height control valves, shock absorbers, lubrication
fittings, air brake system valves, brake lining, muffler and exhaust system components, drive shaft, and
engine and transmission sumps shall be protected from undercoating overspray.
3.4 STEERING
3.4.1 STRENGTH
Fatigue life of all steering components shall exceed 1,000,000 miles. No element of the steering system
shall fail before suspension system components when one of the tires strikes a severe road hazard.
Inadvertent alternations of steering as a result of striking road hazards are steering failures. The
steering column shall be manufactured by TRW and shall provide both tilt and telescope features. The
steering column shall also include a cover for the horn wire. The steering wheel includes hard plastic
transit bus style rim. Finger grips shall be provided on the wheel, down and away from the driver.
Steering systems that utilize an intermediate shaft to connect the main axle mounted steering box to the
steering column shall utilize intermediate steering shafts manufactured by Dana Corporation.
The front axle shall be a non driving Meritor axle or approved equal rated at 16,000 pounds and shall be
equipped with Q-Plus brakes and spring brake chambers with a load rating sufficient for the coach
loaded to GVWR. Front axle shall be a Meritor Standard or approved equal, drop center type. King
pins shall be the low friction, "Easy Steer" type for longer maintenance intervals.
3.4.2 TURNING EFFORT