SECTION 14: STEERING
8
PA1621 Maintenance Manual All Series | January 2017
2.2 INDEPENDENT FRONT SUSPENSION
STEERING SYSTEM DESCRIPTION
The steering system consists of the steering
wheel and column assembly, a vane-type
hydraulic pump, reservoir, filter, interconnecting
system lines and hoses, integral power steering
gear and linkage (Figure 2). The steering linkage
consists of tie rods connected to the bell crank
and the steering arm at the left side of the
coach, and to the idler arm and steering arm at
the right side of the coach. The bell crank and
idler arm are connected by a relay rod. A drag
link connected to the bell crank and the pitman
arm, which is mounted to the steering gear,
transfers the turning motion of the steering
wheel to the steering arms.
Hydraulic components are added to transmit,
increase and regulate steering control forces.
These elements are:
1. A vane type hydraulic pump;
2. Hydraulic reservoir and hoses.
3. Hydraulic power cylinder (VIP & Bus Shells).
NOTE
VIP vehicles and Bus Shells are also equipped
with a hydraulic power cylinder. The hydraulic
power cylinder provides an added source of
assistance and being connected to the R.H.
wheel, makes it such that the total steering
forces are produced with minimal stress on
mechanical linkages.
The steering gearbox is self-powered and
provides movement with power assistance to the
left wheel.
Steering stability and tire wear are influenced by
wheels, hubs, tires, air suspension, brakes, front
suspension and front end alignment which are all
covered in their respective sections in this
manual.
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