Eaton Compressor & Fabrication C-STOV-MC001-E1 - Manual (Page 7)

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 7
Hydraulic Circuit
Explanation
Neutral Circuits:
Closed Center
Closed Center
• Uses a pressure
compensated variable
displacement pump
• In neutral position
pump and tank are
disconnected
• Most suitable on large
construction equipment
Valve Option A
Closed Center System
Pressure
Compensated
Pump
P
R L
T
P
R L
T
Direct
Mechanical
Link
Steering
Control
Unit
Gerotor
Metering
Mechanism
with
Neutral
Bleed
Closed Center with
Neutral Bleed
Neutral Bleed Feature
Closed Center Steering
Control Units are available
with and without neutral
bleed feature. Most
applications may not require
the bleed feature, however,
the maximum temperature
differential between
components within the
steering circuit must not
exceed specification (50° F or
28° C). Order unit with the
bleed feature if the
temperature differential may
exceed this limit. The neutral
bleed feature allows a small
flow of fluid to pass through
the unit when in neutral to
reduce the thermal
differential.
Typical applications where
neutral bleed is required are:
• Remote steering
position from power
source.
• Extended engine idle
operation when vehicle
is parked.
• High duty cycle
operation sharing a
common reservoir with
the steering circuit.
Applications
• Construction Industry