Milton CAT 374D L - Manual (Page 3)

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Hydraulics
Cat hydraulics deliver power and precise control to keep material moving
Main Pumps
The hydraulic system includes three pumps with an
independent swing circuit. The hydraulic circuit utilizes a
load-sensing system to ensure high hydraulic system efficiency
and excellent productivity with little hydraulic loss.
•
Large, heavy-duty main pumps and a separate swing
pump provide quick cycle times during multi-function
operation.
Reverse Swing Dampening Valve
Swing dampening valves reduce swing wag and produce
smooth swing stops.
Advanced Features
The following are hydraulic system features of the 374D L.
•
The electric re-generation system is incorporated into
the hydraulic system to improve productivity and lower
fuel consumption.
• The main pump flow has increased 10 percent to provide
shorter cycle times.
• The main implement pressure has been increased
9 percent. This also provides shorter cycle times with
higher digging forces, increased bucket fill factors.
• Stick cylinder diameter for mass and reach configurations
has been increased along with the bucket cylinder diameter
on the reach stick. These increases produce 17 percent
higher digging forces.
Proportional Priority Pressure Compensation (PPPC)
Hydraulics
Load-sensing, PPPC system, with Caterpillar-developed
electronic actuation, provides high efficiency and excellent
controllability.
•
Cylinder speed is directly related to operator’s movement
of joystick from feathering to full speed.
• Flow to cylinders during multifunctional operation is
directly controlled by the operator and is not dependent
on loads.
• Controller reduces pump output to minimum to save
power when joysticks are in neutral position.