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Maintenance
HYDRAULIC SYSTEM
The hydraulic system provides power to the driven wheels, steering, hi-tip and skip tip
functions. The hydraulic tank is made from steel and forms part of the structure of the
dumper.
The hydraulics system comprises of a axial piston pump providing the power for driving the
wheels of the dumper and a small gear pump mounted to the end to power the main steering,
tipping and hi-lift functions of the dumper.
The axial piston pump draws oil through a suction flow/return flow filter unit. This filter unit
ensures the pump always ensures a positive pressure of 0.5 bar to the pump. This pre-charge
improves start up and cold start characteristics of the dumper and the risk of cavitation can
significantly reduced.
The gear pump draws oil through a suction strainer element and feeds the steering and main
hydraulic functions of the dumper. The gear pump incorporates a load sensing valve for the
steering, and also has two outlets one for the steering and one for the main system.
Steering of the dumper is by means of a double acting hydraulic cylinder, mounted at each
end on the two half's of the chassis with the centre point articulation this cylinder when open
and closed will provide the steering lock to lock operation. The supply of oil is governed by
a steering valve unit.
See schematic layout on flowing page.
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