CAT Hydraulic Excavator 325DL - Manual (Page 5)

Component Layout. The hydraulic
system and component locations have
been designed to provide a high level
of system efficiency. The main pumps,
control valves and hydraulic tank are
located close together to allow for shorter
tubes and lines between components
which reduces friction loss and pressure
drops in the lines. The layout further
provides greater operator comfort by
placing the radiator on the cab side of
the upper structure. This allows incoming
air to enter the engine compartment
from the operator side and hot air and
corresponding engine sound to exit on
the opposite side away from the operator.
This reduces engine compartment heat
and sound being transmitted to the
operator.
Pilot System. The pilot pump is
independent from the main pumps
and controls the front linkage, swing
and travel operations.
Hydraulic Cross Sensing System.
The hydraulic cross sensing system
utilizes each of two hydraulic pumps
to 100 percent of engine power, under
all operating conditions. This improves
productivity with faster implement
speeds and quicker, stronger pivot turns.
Boom and Stick Regeneration Circuit.
Boom and stick regeneration circuit
saves energy during boom-down
and stick-in operation which increases
efficiency, reduces cycle times and
pressure loss for higher productivity,
lower operating costs and increased
fuel efficiency.
Auxiliary Hydraulic Valve.
The auxiliary valve is standard on the
325D. Control Circuits are available
as attachments, allowing for operation
of high and medium pressure tools
such as shears, grapples, hammers,
pulverizers, multi-processors and
vibratory plate compactors. Hydraulic Cylinder Snubbers.
Snubbers are located at the rod-end
of the boom cylinders and both ends
of the stick cylinders to cushion shocks
while reducing sound levels and
extending component life.
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Hydraulics
Cat ® hydraulics deliver power and precise control to keep material moving.