CAT Hydraulic Excavator 328D LCR - 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. This allows
for shorter tubes and lines between
components, which reduce 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.
Hot air and corresponding engine sound
exits 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. This increases
operator efficiency, reduces cycle times
and pressure loss. Benefits include higher
productivity, lower operating costs and
increased fuel efficiency.
Auxiliary Hydraulic Valve. The auxiliary
valve is standard on the 328D LCR.
Control Circuits are available as
attachments, allowing for operation
of high and medium pressure tools.
These include 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. Benefits include reducing
sound levels, cushion shocks while
extending component life.
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Hydraulics
Cat ® hydraulics deliver power and precise control to keep material moving.