Milton CAT 349E L - Manual (Page 3)

Hydraulics
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Hydraulic Horsepower
Hydraulic horsepower is the actual machine power available
to do work through implements and work tools. It’s much
more than just the engine power under the hood – it’s a core
strength that differentiates Cat
® machines from other brands.
Main Control Valve and Auxiliary Valves
The 349E uses a high­pressure system to tackle the toughest
of work in short order. The 349E uses a redesigned side­by­
side main control valve, which allows for auxiliary hydraulic
lines and valve configurations to be simplifi ed for greater
reliability.
Return Filter
The return filter is a capsule­type design with a cartridge
inside. Unlike many competitors’ offerings, the Cat cartridge
features a handle to help remove and change oil without
spillage or contamination. A sensor attached to the fi lter warns
the operator if it is full or exceeds a certain pressure level.
Swing Priority Circuit
The swing priority circuit on the 349E uses a new electric
valve that’s operated by the machine’s improved Electronic
Control Module (ECM). Compared to using a hydraulic
valve, an electric valve allows for more finely tuned control,
which is critical during material loading.
Electric Boom Regeneration Valve
A new electric boom regeneration valve minimizes pump fl ow
when the boom lowers down, which improves fuel economy.
It is optimized for any dial speed setting being used by the
operator, which in turn aids controllability and enhances
component durability.
Stick Regeneration Circuit
The 349E regenerates the flow of oil from the rod end of the
stick cylinder to the head end of the stick cylinder during
low­load, stick­in operation – an approach that saves energy
and expense.
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