Specifications

REQUEST FOR PROPOSALS FOR
PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES
RFP SRTA-2014-01
TECHNICAL SPECIFICATIONS
PAGE-9
December 2013
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e. The three (3) Barksdale, or approved equal, height control valves, one (1) at the
front axle and two
(2) at the rear axle, will retain the height of the body in relation to the axles under
all loading conditions.
f. Each axle shall have front radius rods manufactured by Clevite, or approved
equal, and rear radius rods manufactured by O&S, or approved equal.
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g. Two (2) lower, one (1) upper, and one (1) lateral to locate the axle position and to
transmit the driving, braking and cornering forces from the road to the coach
understructure.
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h. The front upper radius arm assembly shall have a turn buckle to allow
adjustment of the front axle caster without arm removal.
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i. Shock absorbers, Koni adjustable, or approved equal, shall be provided.
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j. Rubber axle stops shall be provided between the axle and frame on each side of
the axles to prevent axle and/or frame damage in severe bounce condition and to
allow operation of the coach if one or more air bellows are deflated.
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8.7 Steering System
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a. Power steering shall be Ross Model TAS6505, or approved equal. Steering
column shall be TRW Electric assist without column turn signal and hazard
switch, or approved equal.
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b. Steering effort and number of turns "lock-to-lock" shall be designed and
coordinated to minimize driver fatigue. Steering forces and characteristics in the
event of failure of the power boost shall enable the coach to be safely driven in
this condition.
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c. Steering mechanism shall be mounted so that all adjustments can be made
without dismounting parts. Mounting of gear assembly shall be engineered to
reduce road shock and vibration.
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d. Steering units shall have hex head filler and drain plugs.
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e. The drag link assembly shall have a horizontal socket for attachment at the
Pitman arm, and a vertical stud for attachment at the steering knuckle arm. Both
ends shall have internal springs and lubrication fittings. The assembly shall have
plus or minus .50-inch length adjustment.
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f. Front axle tie rod ends shall be threaded into the tube for adjustment without
removal. Lubrication fittings shall be provided on the nonserviceable end
assemblies.
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g. The steering wheel shall be twenty inches (20") minimum in diameter and shall
be black color plastic or synthetic resin construction with a metal core. It shall be
provided with puller holes in the hub.
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h. Shall be tilt with telescoping steering shaft.