June 2004 - 9507EI/5
1-18
2 to 9 Tonne Dumper Instruction Manual
Operating Instructions
The dumpers have a chassis which incorporates a design known
as centre pivot articulated steering. The chassis is in two parts,
a front and a rear section which are joined together in the middle
by a vertical pivot pin and a link which between them provides
movement in the horizontal and lateral planes.
This combined movement allows the front frame to be moved
relative to the rear frame, by means of a single double acting ram
to provide steering.
The link in the system enables the front and rear frames to
articulate relative to each other and thus provide the ability to
maintain maximum adhesion with the ground at all times.
The articulating frames can create a trap when steered into a full lock
position, transfers are located in this area to warn of the danger
The steering referred to above (i.e. a hydraulic ram connecting
the frames) is controlled through the steering wheel acting on an
'Orbitrol' hydrostatic steering unit.
Hydraulic power is supplied via an engine driven pump to the
steering unit, which on turning the steering wheel meters oil to
the steering ram and thus provides movement in either direction
of the vehicle.
In the event of a hydraulic failure the vehicle can still be steered
. Under these circumstances steering loads are high and the
dumper should only be driven at slow speeds.
Steering
30º
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