Eaton Compressor & Fabrication C-STOV-MC001-E1 - Manual (Page 14)

14 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006
Description
Eaton’s 2-Speed technology
offers two operator-
selectable metered modes
at any time, with the touch
of a button or the flip of a
switch, and provides the
operator flexibility to
significantly improve the
overall steering experience.
2-Speed technology is
available on the Series 10
Steering Control Unit (SCU).
Dual Steering Modes
Typically, the gerotor
between the SCU housing
and the shift valve is the
smaller gerotor (first
gerotor). The shift valve is
activated by the operator,
which allows or prevents
flow to the second gerotor.
A separate solenoid valve
provides the pressure pilot
signal to shift the
aforementioned valve. The
OEM will define and provide
the operator switch to
activate the solenoid valve.
Metered Steering Mode 1
– The steering unit operates
the same as a traditional
hydrostatic steering control
unit. Steering (flow) is a
function of steering wheel
rotations (rpm). Metered
(gerotor) steering provides
precise, responsive, and
smooth steering. All the
flow is metered by the first
gerotor, resulting in a
greater number of turns
lock-to-lock. In case of
pressure loss, the shift valve
automatically prevents flow
to the second gerotor and
emergency steering is
available via the first gerotor. Metered Steering Mode 2
– The steering unit operates
the same as a traditional
hydrostatic steering control
unit, except the flow is
metered for a combined
displacement of two
gerotors. As with Mode 1,
steering (flow) is a function
of steering wheel rotations.
As the total displacement
per rotation is the sum of
the two gerotor
displacements, the number
of turns lock-to-lock may be
significantly decreased.
Operator effort is greatly
reduced during the work
cycle. The number of turns
lock-to-lock could go down
to 0.5, where the ratio of
the two gerotor
displacements could vary
from 1:1 to as high as 5:1,
providing great flexibility in
the design. Benefits
• Manual steering
capability in unpowered
mode (“emergency
steering”)
• Steering flow is always
proportional to steering
speed
• Allows for excellent
roadability and operator
selectable quick-steer
for work cycles
Features
• Open Center, Load
Sense
• All Integral Valves
• Wide Angle
• Max System pressure:
241 Bar [3500 psi]
Applications
• All Ackerman Steering
• Tractors, Telehandlers,
Sweepers, Forestry
Equipment, Backhoes,
Loaders
• Sprayers, Combines,
Motor Graders
Special Features
and Application
2-Speed