Milton CAT 450E - Manual (Page 7)

Load-Sensing Hydraulic System.
The variable displacement piston pump
and flow-sharing hydraulic valves
sense work demand and adjust flow
and pressure for increased productivity.
Load-sensing hydraulics deliver:
• Maximum lift and dig forces at any
engine RPM
• Cooler hydraulic system
• Better fuel efficiency
• Quieter operation
• Reduced wear on components
Hydraulic Pump. The variable
displacement piston pump improves
implement response and speed while
still providing high forces at any engine
speed. A supplemental gear pump
provides increased flow and
responsiveness.
Torque Limiter Control. The pump
torque limiter control manages
distribution of engine power to the
hydraulic system and drive train.
E-Series improvements produce more
aggressive backhoe digging and
stronger truck loading performance.
Flow-Sharing Hydraulic Valves.
Technology leveraged from Cat
Hydraulic Excavators, new flow-
sharing hydraulic valves automatically
distribute flow to optimize multi-
function implement performance.
Closed-center implement valves signal
hydraulic system requirements to a
control valve located on the pump.
Clamps and Bushings. Metal clamps
with rubber bushings are used at hose
attachment points to eliminate metal-to-
metal contact and increase wear life.
Cat XT-3 ES ToughGuard™ Hoses.
Improved bend radius and abrasion
resistance provide reliable long life
in the toughest conditions. Made of
four overlapping, insulated wire spiral
wraps bonded together for durability,
Cat XT-3 ES (Enhanced Spiral)
ToughGuard hoses exceed SAE
certification standards. The hose routing
protects them from work damage, and
hose failure is substantially reduced.
Cat XT-3 ES ToughGuard hoses
combined with Cat couplings and O-ring
face seal fittings provide a leak-free
system. All backhoe hydraulic circuits
utilize the new ToughGuard hose with
extended wear characteristics.
7
Hydraulics
Caterpillar sets the standard in power and precision with load-sensing hydraulics.