CAT Hydraulic Excavator 328D LCR User Manual download pdf (Page 5)

5

Hydraulics

Cat hydraulics deliver power and precise control to keep material moving.

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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