Eaton Compressor & Fabrication C-STOV-MC001-E1 User Manual

Steering Catalog

Steering Control Units
Torque Generators
Steering Columns

2 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006

Literature Referenced in this Catalog:

• Eaton Technical Bulletin 3-401

• Eaton Flow Divider Catalog E-VLFL-MC001-E

• Eaton Relief Valve Catalog 11-510

• Eaton Gear Pumps Series 26 Model 26000 Catalog 11-609

• Eaton Char-Lynn Low Speed High Torque Motors Catalog E-MOLO-MC001-E2

• Vick ers

®

Screw in Cartridge Values Catalog V-VLOV-MC001-E2

• Vick ers

®

Proportional Valves Catalog 539

• Vickers Solenoid Operated Directional Valves Catalog GB-C-2015

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 3

Table of
Contents

Description and Technologies About Power Steering

Description and Advantages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Hydraulic Circuit Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

Neutral Circuits

Open Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Open Center Power Beyond . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Closed Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Load Sensing (static and dynamic signal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Work Circuits

Non-Load Reaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Load Reaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Steering Units with Integral Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Special Features and Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-18

Manual Steering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2 Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Dual Displacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Eaton Patented Technologies

Q-Amp (Flow Amplification) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Wide Angle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cylinder Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

VersaSteer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

STC Direct Porting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Steering Control Units and Torque Generators

Series 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Series 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Series 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Series 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Series 40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Torque Generator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Steering System Components and System Accessories

Antijerk Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

Priority Valves VLC, VLE, VLH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

Check Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

Relief Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Columns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Steering Wheels and Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

EH Proportional Steer Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Four Wheel Steer Switching Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Flow Divider Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Brake Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

T Series Hydraulic Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Sizing and Application

Ackermann Type Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Articulated Type Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Articulated Vehicle Steering Analysis Form. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Articulated Vehicle Steering Analysis Form. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Information contained in this publication is accurate as of the publication date and is subject to change without notice. Performance values are typical values. Customers are responsible for selecting
products for their applications using normal engineering methods.

4 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006

Description and
Advantages

Steering Control Units

The Char-Lynn®steering control unit (SCU) is fully
fluid linked. This means there is no mechanical
connection between the steering unit, the pump
and the steering cylinders. The unit consists of a
manually operated directional control servo valve
and feedback meter element in a single body. It is
used principally for fluid linked power steering
systems but it can be used for some servo-type
applications or any application where visual
positioning is required. The close coupled, rotary
action valve performs all necessary fluid directing
functions with a small number of moving parts.
The manually actuated valve is coupled with the
mechanical drive to the meter gear. The control is
lubricated and protected by the power fluid in the
system and can operate in many environments.

Char-Lynn power steering control units offer the
following advantages:

• Minimizes steering linkage—reduces cost, provides
flexibility in design.

• Provides complete isolation of load forces from the
control station—provides operator comfort.

• Provides continuous, unlimited control action with
very low input torque.

• Provides a wide selection of control circuits and
meter sizes.

• Can work with many kinds of power steering pumps
or fluid supply.

SERIES 5 (291-XXXX-XXX, 292-XXXX-XXX, 293-XXXX-XXX, 294-XXXX-XXX)

Displacement 31.5 - 146 cm3/r 1.92 - 8.9 in3/r
Flow 11 - 19 l/min 3 - 5 GPM
Pressure 140 bar 2030 PSI

SERIES 10 (200-XXXX-XXX, 220-XXXX-XXX)

Displacement 58.7 - 739 cm3/r 3.58 - 45.1 in3/r
Flow 11 - 76 l/min 3 - 20 GPM
Pressure 275 bar 4000 PSI

SERIES 20 (236-XXXX-XXX)

Displacement 60 - 985 cm3/r 3.6 - 60 in3/r
Flow 38 - 114 l/min 10 - 30 GPM
Pressure 241 bar 3500 PSI

SERIES 25 (251-XXXX-XXX, 252-XXXX-XXX, 253-XXXX-XXX)

Displacement 490 - 1230 cm3/r 30 - 75 in3/r
Flow 95 - 151 l/min 25 - 40 GPM
Pressure 241 bar 3500 PSI

SERIES 40 (281-XXXX-XXX, 282-XXXX-XXX, 283-XXXX-XXX)*

Displacement 1230 - 3030 cm3/r 75 - 185 in3/r
Flow 151 - 227 l/min 40 - 60 GPM
Pressure 241 bar 3500 PSI

* For all other product numbers consult steering website.

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 5

Description and
Advantages

Torque Generator

Char-Lynn torque generators have been completely
redesigned to meet the needs of the changing
marketplace. These torque generators have served
the industry well, providing:

• Power assist for vehicle steering

• Power assist on gates and valves, eliminating the
large hand wheels

• Powerful rotary motion with effortless manual rotary
input on numerous other applications

Today’s market includes power steering on electric lift
trucks. These new torque generators have been designed
with features that greatly improve the operator’s comfort as
well as the vehicle’s performance.

Use the Torque Generator as rotary power assist for:

• Large indexing tables

• Manually operated gates and valves

• Manual positioning devices

• Mechanical steering systems

• T urntables

SERIES 217, 227

Displacement 76 - 160 cm3/r 4.7 - 9.6 in3/r
Flow 15 l/min 4 GPM
Pressure 69 and 172 bar 1000 and 2500 PSI

STEERING COLUMNS (204-XXXX-XXX)

Jacket Length 56 - 836 mm 2.2 - 33 inch
Horn Wire with and without with and without
Upper Ends 10 Upper End Types 10 Upper End Types

Customized Steering Columns

Char-Lynn columns can be custom built to your
exact specifications. The column and mounting
flange is of a sturdy single weldment design. These
columns have high thrust and side load capacity
with low shaft torsional friction. A tilt column is
also available.

6 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006

Hydraulic Circuit
Explanation

Neutral Circuits:
Open Center
and Open Center
Power Beyond

Open Center

• Simplest, most
economical system

• Uses a fixed
displacement pump

• In neutral position
pump and tank are
connected

• Most suitable on
smaller type vehicles

Open Center Power Beyond

The power beyond steering
control unit supplies steering
and auxiliary valve functions.
The power beyond unit is
used on medium pressure,
open center (fixed
displacement pump) systems.

When not steering, the power
beyond unit directs all inlet
flow to the auxiliary circuit.
However once steering is
initiated, part of the auxiliary
flow is diverted to steering.
Since steering has priority, all
flow, if required, will be
diverted to steering. The tank
port of the steering unit has
flow only when steering is
operated. Thus, flow out of
the auxiliary (“PB”) port and
the tank port will fluctuate or
stop depending on steering
input.

The following special
considerations should be
addressed when applying
power beyond steering:

• Auxiliary valves
(connected to PB) must
be open center type.
Slight bump or kick may
be felt in steering
wheel when auxiliary
functions are activated
during steering
operations.

• Pump flow not used for
steering is available at
power beyond (PB)
outlet, except at
steering stops where
total pump flow goes
over the system relief
valve. Avoid auxiliary
functions that require
constant flow while
steering.

• Flow is only directed to
the tank port when
steering is operated.
Avoid systems where
return flow from tank
port is used for auxiliary
functions.

• Inlet pressure to the
steering unit will be the
higher of steering
system pressure or
auxiliary valve pressure.

• Generally avoid
systems where heavy
use of auxiliary
functions occur while
steering.

Applications

• Lawn and Garden
Equipment

• Utility Vehicles

LR

Gerotor

T

LR

Gerotor

T

PB

P

Fixed
Displacement
Pump

P

To Auxilliary Circuit
Open Center Valves

Fixed
Displacement
Pump

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

RL

T

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
diff erential.

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

RL

Gerotor
Metering
Mechanism

T

P

with
Neutral
Bleed

Direct
Mechanical
Link

Steering
Control
Unit

8 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006

Hydraulic Circuit
Explanation

Neutral Circuits:
Load Sensing

Load Sensing Circuits

Char-Lynn load sensing
power steering uses
conventional or load sensing
power supplies to achieve
load sensing steering. The
use of a load sensing
steering unit and a priority
valve in a normal power
steering circuit offers the
following advantages:

• Provides smooth
pressure compensated
steering because load
variations in the
steering circuit do not
affect axle response or
maximum steering rate.

• Provides true power
beyond system
capability by splitting
the system into two
independent circuits.
Pressure transients are
isolated in each circuit.
Only the flow required
by the steering
maneuver goes to the
steering circuit. Flow
not required for
steering is available for
use in the auxiliary
circuits.

• Provides reliable operation
because the steering
circuit always has flow
and pressure priority.

Char-Lynn load sensing
steering control units and
priority valves can be used with
open center , closed center or
load sensing systems. Use in
an open center system with a
fixed displacement pump or a
closed center system with a
pressure compensated pump,
offers many of the features of a
load sensing system. Excess
flow is available f or auxiliary
circuits.

Listed below are the
components of a typical load
sensing control circuit and a
brief application description.

Pump—May be fixed
displacement, pressure
compensated,
or flow and pressure
compensated design.

Prior ity V alve—Sized for
design pressure drop at
maximum pump output flow
rate and priority flow
requirements. The minimum
control pressure must assure
adequate steering flow rate
and must be matched with
the steering control unit.

A dynamic signal priority
valve must be used with a
dynamic signal steering
control unit.

Steering Control Unit—

Designed for specific rated
flows and control pressures.
It must be matched with a
control pressure in the
priority valve to obtain
maximum steering rates.
Higher flow rates require
higher control pressures.
Neutral internal bleed
assures component
temperature equalization.

LS Line—A LS line is always
needed to sense pressure
downstream from the
variable control orifice in the
steering control unit. This is
balanced by an internal
passage to the opposite side
of the priority control spool.

The total system
performance depends on
careful consideration of the
control pressure chosen and
pressure drop in the CF line.

Steering Relief Valve—

Must be factory set at least
10 bar [145 PSl] above the
maximum steering cylinder
pressure requirement. Most
of the flow will be directed
to the auxiliary circuit (EF)
when the relief setting is
exceeded.

System Main Relief
Valve—A pressure relief

valve for the auxiliary circuit
and/or a main safety valve for
the protection of the pump is
recommended and sized for
the maximum pump output
flow rate. If a main relief valve
is used, it must be set above
the priority circuit steering
relief valve pressure setting.

LS— Load Sensing
DS— Dynamic Signal
PP— Pilot Pressure
CF— Control Flow
EF — Excess Flow

Manual
Input

LS

T

Filter

Steering Cylinder

LR

TP

DSLS

Main
Relief

P

Pump Prime Mover

Load Sensing
Steering Unit

CF

PP

Priority Valve

Dynamic Signal

High Pressure
Carryover

EF

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 9

Hydraulic Circuit
Explanation

Neutral Circuits:
Load Sensing

Dynamic Signal—
Open Center Pump

Dynamic Signal—
Load Sensing Pump

Load Sensing Circuits—
Signal Systems

Two types of load sensing
signal systems are
available—Dynamic and
Static.

Dynamic Signal—Used for
more difficult applications.
The dynamic signal systems
offer the following benefits:

• Faster steering
response.

• Improved cold weather
start-up performance.

• Increased flexibility to
solve problems related
to system performance
and stability.

Dynamic
Signal

RL

Load
Sensing
(Dynamic

Signal)
Steering

Control Unit
(non-load

LS P

T
LS CF EF

T

P

Fixed Displacement Pump

Load Sensing Steering System with Fixed
Displacement Pump (Open Center Circuit)

reaction)

High Pressure
Carryover to
Auxiliary Circuit with
Open Center Valve(s)

Priority Valve
(Dynamic Signal)

Dynamic
Signal

T

Shuttle Valve

RL

Load
Sensing
(Dynamic
Signal)
Steering
Control Unit
(non-load

TLSP

LS CFEF

P

Pressure and Flow
Compensated Pump

Load Sensing Steering System with Pressure and Flow
Compensated Pump (Closed Center, Load Sensing Circuit)

reaction)

Auxiliary
Circuit with
Load Sensing
Valve(s)

Priority Valve
(Dynamic Signal)

Pilot Signal
from Auxiliary
Circuit

10 EATON Char-Lynn Steering Catalog C-STOV-MC0 01-E1 July 2006

Static Signal—
Open Center Pump

Static Signal—Used for

conventional applications
where response or circuit
stability is not a problem.
The load sensing pilot line
should not exceed 2 meters
[6 feet] in length.

Hydraulic Circuit
Explanation

Neutral Circuits:
Load Sensing

Static Signal

RL

Load
Sensing
(Static

Signal)
Steering

Control Unit
(non-load

TLS P

LS CF EF

T

P

Fixed Displacement Pump

Load Sensing Steering System with
Fixed Displacement Pump
(Open Center Circuit)

reaction)

Auxiliary
Circuit with
Open Center
Valve(s)

Priority Valve
(Static Signal)

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 11

Hydraulic Circuit
Explanation

Work Circuits:
Non-Load Reaction
and Load Reaction

Non-Load Reaction

A non-load reaction steering
unit blocks the cylinder ports
in neutral, holding the axle
position whenever the
operator releases the
steering wheel.

Load Reaction

A load reaction steering unit
couples the cylinder ports
internally (in the neutral
position) with the meter
gear set. Axle forces are
then allowed to return the
steering wheel to its
approximate original
position. Comparable to
automobile steering,
gradually releasing the
wheel mid turn will allow
the steering wheel to spin
back as the vehicle
straightens.

The cylinder system used
with load reaction units

must have equal oil
volume displaced in both

directions. The cylinders
should be a parallel pair (as
shown) or one double rod
end unit. Do not use with a

single unequal area
cylinder system.

Gerotor
Metering
Mechanism

RL

Direct
Mechanical
Link

Gerotor
Metering
Mechanism

T

Closed Center System
Non-Load Reaction Circuit

P

Steering
Control
Unit

Pressure and Flow
Compensated Pump

RL

T

P

Fixed
Displacement
Pump

Direct
Mechanical
Link

Steering
Control
Unit

Open Center System
Load Reaction Circuit

12 EATON Char-Lynn Steering Catalog C-STOV-MC0 01-E1 July 2006

Steering Units
with Integral
Valves

Integral valves are available
for the Char-Lynn steering
control unit. Included are:
Inlet Relief Valve, Cylinder
Port Shock Valves, LS-Relief
Valve, and Anti-Cavitation
Valves for cylinder ports. In
addition, a Manual Steering
Check V alv e for limited
manual steering is included.

The integral valves eliminate
the need for a separate
valve block, and provides
versatility to meet any
steering circuit standard.

Valve Description:

1 Anti-cavitation check

valve for cylinder ports—

(R & L) protects steering
circuit against vacuum
(cavitation) conditions.

2 Cylinder Port Relief

Valves—(R & L) protects

hoses against pressure
surge created by ground
forces on the steered axle.

3 Manual Steering Check

Valve—converts unit to a

hand operated pump for
limited manual steering.
Included in all units except
Series 20, 25, and 40.**

4 Inlet Relief Valve—limits

maximum pressure drop
across the steering unit
protecting the steering
circuit.

5 Inlet Check Valve—

prevents oil from returning
through the steering unit
when pressure on the
cylinder side is greater
than pressure on the inlet
side to prevent steering
wheel kick.

6 LS-Relief Valve—Limits

maximum pressure in the
steering circuit (LS units
only)

**Steering units with displacements larger than

185 cm

3

/r [11.3 in3/r] may require a separate

power source for limited operation.

1

2

3

4

5

EF

6

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 13

Special Features
and Application

Manual Steering

96
[5.9]

74
[4.5]

59
[3.6]

46
[2.8]

185
[11.3]

146
[8.9]

160
[9.7]

230
[14.1]

295
[17.9]

370
[22.6]

120
[7.3]

Description

The steering control unit can
provide steering flow when
the pump or engine fails. It
will pump oil through the
meter (gerotor) as the
operator applies input or
torque to the steering wheel
which provides limited
manual steering.

This feature is available in all
steering models except for
Series 25 and 40.

Use of Graph

1. Determine steering work
port pressure required to
preform the desired
steering maneuver from
vehicle test data. This
defines the approximate
manual steering pressure
level required. Find this
value on the vertical axis
and construct a horizontal
line on the graph.

2. Find the input torque limit

on the horizontal axis.
Follow this vertically until
it crosses the required
pressure line of step 1.

3. The maximum steering

unit displacement is
identified by the first
angled line to the left of
this intersection.

[PSI]

[1000]

[ 800]

[ 600]

[ 400]

[ 200]

30-60
RPM

0

0

27
[20]

1) Maximum flow less than 7,6 l/min [2 GPM].

2) Actual steering pressures required and manual
steering capabilities must be verified with vehicle
testing.

The above curves are intended as a design guide only.

10-15
RPM

46

46

[2.8]

[2.8]

74

74

[4.5]

[4.5]

54
[40]

Manual Input Torque
Nm [lb-ft]

59

59

[3.6]

[3.6]

81
[60]

1-3
RPM

96

96
[5.9]

[5.9]

185

185

[11.3]

[11.3]

108
[80]

120

120

[7.3]

[7.3]

295

295

[17.9]

[17.9]

370

370

[22.6]

[22.6]

Displacement

3

cm

/r [in3/r]

146

146

[8.9]

[8.9]

160

160
[9.7]

[9.7]

230

230

[14.1]

[14.1]

136
[100]

70

60

50

40

bar

30

20

10

0

14 EATON Char-Lynn Steering Catalog C-STOV-MC0 01-E1 July 2006

Description

Eaton’s 2-Speed technology
offers two operator­selectable 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

• T ractors, T elehandlers,
Sweepers, Forestry
Equipment, Backhoes,
Loaders

• Sprayers, Combines,
Motor Graders

Special Features
and Application

2-Speed

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 15

Special Features
and Application

Dual
Displacement

Description

The dual displacement
steering control unit allows
manufacturers of off road
vehicles to retain manual
steering capabilities while
reducing the number of
components in their system.
By using two displacements
in one unit we offer a better
solution to manually steer a
vehicle in an unpowered
mode without the need of a
back-up power system—
resulting in a more
economical machine.

The dual displacement
steering unit uses two
gerotors and a pressure
controlled logic valve. The
logic valve switches bet ween
two displacements, one
displacement for manual
steering and the total of both
displacements for powered
operation. The logic valve is
spring returned to the
smaller manual
displacement when inlet
pressure falls below 8 bar
[120 psi]. Above 8 bar [120
psi] the logic valve connects
both gerotors to provide full
powered displacement.

Manual steering capabilities
in unpowered mode

• Eliminates the need of
a back-up emergency
system.

• Engages the small
displacement in an
unpowered mode and
allows manual steering.

• Allows vehicles to meet
ISO/TUV road regulations
without the need of the
currently used
emergency system.

Performance in powered mode

• Both gerotors are
engaged to steer the
vehicle.

• Same performance as
other Char-Lynn
steering units.

Additional Features

• Steering circuit: Load
Sensing Dynamic Signal

• Max. system pressure:
241 bar [3500 psi].

• Valve options and other
features: same as those
available on Series 10
(single displacement)
units

DISPLACEMENT CHART:

Gerotor 1 Gerotor 1 and 2 Gerotor 1 Gerotor 1 and 2

Manual displ. Powered displ. Manual displ. Powered displ.

in3/rev in3/rev cm3/rev cm3/rev

3.6 9.5 60 156

3.6 10.9 60 179

3.6 12.5 60 205

3.6 13.3 60 218

3.6 14.9 60 244

For any other displacement please see your Eaton Representative.

Powered Mode

Manual Mode

Added Gerotor

Logic Valve

Manual Gerotor

TLS P

RL

Manual 60 cm
Powered 244 cm

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

3.5

3.0

2.5

Steering Flow GPM

2.0

1.5

1.0

0.5
0

Flow vs RPM (for each operating mode)

3

/r [3.6 in3/r]

3

/r [14.9 in3/r]

Powered Mode

Powered Mode

Manual Mode

Manual Mode

30 45 60 75 90 60 105 120

015

Input Speed RPM

30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0

Steering Flow l/min

• Manual Steering
Steering a vehicle with
loss of engine power may
not be possible with a
large displacement
steering control unit (SCU).
Q-Amp with manual
feature has the smaller
displacement required for
manual steering and has
the additional flow
requirement of the larger
displacement SCU for
power steering.

• Single Cylinder

(Unequal area)

On vehicles with one single
unequal area cylinder the
steering wheel turns lock to
lock are more in one
direction than the other.
When extending the rod one
would get more turns than
when retracting it. A
different Q-Amp ratio while
turning in one direction
versus the other can be
used to give an equal
number of turns lock to lock
in each direction.

Eaton Patented
Technologies

Q-Amp (Flow
Amplification)
for Load Sensing
Circuits

Description

Q-Amp steering units have
built in variable orifices
that provide flow directly to
the cylinder without going
through the gerotor section.
The orifices do not open
until after the gerotor begins
to rotate and then gradually
open until the desired flow
is achieved which is

proportional to the flow
going through the gerotor. A
typical Q-Amp unit has a
ratio of 1.6 : 1 which means
the flow of the cylinder is

1.6 times the flow going
through the gerotor when
turning the steering wheel
at medium to fast speeds.
(See model code for
available ratios.)

Covered by one or more of the following U.S.
and foreign Patents: 4759182, 4862690,

4781219. Unequal area Q-Amp.

Q-Amp Steering Control Unit—Slow Turn

Features

• Variable Ratio

Q-Amp Steering Control Unit—Fast Turn

Conventional Steering Control Unit

16 EATON Char-Lynn Steering Catalog C-STOV-MC0 01-E1 July 2006

2:1

1.6:1

Ratio

1:1

10 20 30 40 50

6
5
4

Turns

3

Lock
to

2

Lock

1

10

20 30 40 50

60 70 80 90 100

RPM

60 70 80 90 100

RPM

Fast
Turn

Pump

Fast
Turn

Pump

Slow

Turn

Pump

Rotary
Valve

Rotary
Valve

No Flow

Rotary
Valve

Meter

Cylinder

Meter

Cylinder

Meter

Cylinder

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 17

Eaton Patented
Technologies

Q-Amp (Flow
Amplification)
for Load Sensing
Circuits

Applications

Articulated vehicles such as
wheel loaders, log skidders,
scrapers, trucks, and similar
vehicles can benefit from
this feature.

While roading, a slow
movement of the steering
wheel (input speed), will not
overcorrect steering.
Increasing input speed will
produce the additional
steering flow required to
quickly change the vehicle’s
direction.

For example, operating log
skidders in the woods
requires very quick steering.
This same log skidder on
the road would be extremely
difficult to steer a straight
normal course. The variable
ratio feature provides good
steering in both conditions.

Combines, row crop tractors,
and large articulated
agricultural tractors also can
benefit from this feature
when traveling down
a field. It will be easier to
follow rows or furrows, and
still be able to make fast
turns at the end of the rows.

Variable Ratio

• Wheel Loaders

• Scrapers

• Articulated AG Tractors

• Articulated Dumpers

• Mine T ruc ks

• Forestry Equipment

• Rough T errain Lift T r ucks

Variable Ratio with
Manual Steering

• AG T ractors

• Small Wheel Loaders

• Rubber Tired Excavators

• Sprayers

• Site Handlers

• Graders

• Combines

18 EATON Char-Lynn Steering Catalog C-STOV-MC0 01-E1 July 2006

Eaton Patented
Technologies

Wide Angle

Description

Steering units with wide
angle features have been
developed to significantly
reduce or eliminate the jerky
motion of vehicles with
articulated steering systems.
This has been accomplished
by increasing the maximum
deflection of the spool
relative to the
sleeve. Increasing the
deflection reduces the gain.
This in turn reduces
acceleration and jerk levels
and provides overall
smoother vehicle
performance. The steering
still responds fast enough so
the operator does not notice
the reduced gain.

Benefits

• Minimizes jerking
motion on medium and
large articulated
vehicles.

• Jerk reducing valves and
accumulators can be
eliminated on most
vehicles.

• Avaliable on Series 10,
Series 20 (standard),
and Series 25.

• Eliminates need for
cushion valves

Applications

• Articulated Vehicles

Wide Angle Steering Control Units Patent No. 5080135

These graphs show a computer simulation of the jerk levels and have been verified by
actual vehicle tests.

Flow

60 RPM
125 ms

Wide Angle

Standard

Time

Jerk (g/sec)

8
4
0

-4

-8
012346

Steering Input (RPM)

60 RPM CCW

Time (Seconds)

Standard Steering on a 25 Ton Loader

Computer Simulation

60 RPM CW

Jerk (g/sec)

Jerk (g/sec)

8
4
0

-4

-8
012346

Steering Input (RPM)

60 RPM CW

Jerk (g/sec)

60 RPM CCW

Time (Seconds)

Wide Angle Steering on a 25 Ton Loader

Eaton Patented
Technologies

Cylinder Damping

Description

Cylinder damping can help
smooth the steering action
of large articulated vehicles
such as loaders, scrapers,
and skidders. These vehicles
have overhanging weight
with high inertial loads. This
energy is dissipated by the
cylinder damping orifices
which bleed a small amount
of flow from the cylinder
port to tank.

Cylinder Damping has 3
different levels of
application. The number of
levels equal to the number
of Cylinder Damping (CD)
orifices. This technology is
available on Series 10,
Series 20, Series 25, and
Series 40. Not all SCUs
come with all 3 levels.

Features

Three levels engineered to
fit your application.

Benefits

• Reduces jerking motion
on medium and large
articulated vehicles.

• Available on the
following steering
control units (Series 10,
20, 25, 40).

• Damps or stabilizes
unstable systems.

Applications—
Large Articulated Vehicles

• Wheel Loaders

• Skidders

• Scrapers

Flow Amplification without Cylinder Damping

Flow Amplification with Cylinder Damping

Steering Control Units with Cylinder Damping
Patent No. 5080135

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 19

20 EATON Char-Lynn Steering Catalog C-STOV-MC0 01-E1 July 2006

Eaton Patented
Technologies

VersaSteer

Description

Eaton’s patented
VersaSteer™ technology
offers operator-selectable
Metered or Quick Steering
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.

Dual Steering Modes

Metered Steering –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.

Quick Steering –

Gerotorless (quick) steering
provides a much different
effect, enabling the operator
to put the vehicle in full lock
while only turning the
steering wheel a few
degrees. This is achieved by
hydraulically blocking the
flow of oil to the gerotor
with a shift valve. Full
steering flow can be
obtained by deflecting the
steering wheel ±45° for a
Series 10 and ±50° for a
Series 20. Operator effort is
greatly reduced during the
work cycle.

Benefits

• Provides steering
system cost savings by
eliminating the need for
a separate joystick

• Available on Load Sense
steering systems

• Compatible with
Integral Valv es, Bolt-On
Priority Valv es, Q-Amp
and Cylinder Damping

• Emergency manual
steering capability

• Minor size increase –
can retrofit to existing
vehicles

• Smoother steering with
Eaton Patented W ide
Angle technology.

Features

• Dual steering modes in
one integrated Steering
Control Unit (SCU)

• High pressure rating
and flow capabilities

• Compatible with current
steering options

• Easily retrofit to existing
vehicles

• Proven base technology

• Easy one-touch switch
(OEM defined)

VersaSteer System
Components

• Steering Control Unit

• Solenoid Shift Valve

• Four –04 hoses

• Electric Switch

Series 10 VersaSteer

Traditional Metered Steering Series 10 Quick Steering

Series 20 VersaSteer

SPECIFICATIONS

1. System Pressure Rating ­a. 241 Bar [3500 psi] - Series 10
b. 241 Bar [3500 psi] - Series 20

2. Back Pressure Rating - 21 Bar [305 psi]

3. Flow Rating
a. 15 gpm - Series 10
b. 25 gpm - Series 20

VersaSteer is covered under
US Patent No. 6,318,078

EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006 21

Eaton Patented
Technologies

STC Direct Porting

With the Snap-To-Connect
(STC) Direct Porting option,
the fitting profile is
machined into the SCU
housing, eliminating the
need for extra STC fittings.
This revolutionary and
patented porting technology
provides leak-proof sealing
and has operating pressure
capability exceeding
4500PSI (310bar).

STC Direct Porting is
available with Series 5 and
Series 10 Steering Control
Units.

Benefits

• STC Direct Ports
provide a great
opportunity for
significant cost savings
compared to threaded
fittings

• Eliminates the need for
assembly tools during
installation

• Eliminates installation
variability

• Improves ergonomics ­reduces installer effort
to connect

• Improves serviceability

• High quality, leak-proof
seal

• Eliminates connector
leakage

• Compact design and
overall lighter weight

22 EATON Steering Catalog C-STOV-MC0 01-E1 May 2006

Steering Control
Units—Series 5

Product
Description

The new Series 5 steering
control units (SCU) are
exciting new products
designed for low flow, low
pressure applications.

The Series 5 units are
available in two compact
designs:

Option 1:

Square Housing (Mount)
Unit with Side Ports

Option 2:

Round Housing (Mount) Unit
with End Ports

In addition to the installation
flexibility provided by the
two options above, this new
family of products has best­in-class steering feel and
provides crisp centering.
These units also have better
efficiency (lower pressure
drop) than competitive units.

Power Beyond Models—
Optional power beyond
steering control units supply
steering and flow to auxiliary
valve functions. The power
beyond unit is used in open
center (fixed displacement
pump) systems in the
medium pressure range.
When not steering, the
power beyond unit directs all
inlet flow to the excess flow
port (power beyond) for use
in the auxiliary circuit. Once
steering is initiated, and
since steering has priority,
inlet flow will be diverted to
the steering circuit as
required. Flow out the
excess flow port (power
beyond) and tank port will
vary or stop depending upon
the steering requirement.
The tank port of the steering
unit has flow only when
steering is operating.

SPECIFICATIONS

Max. System Pressure 140 bar [2030 PSI]
Max. Back Pressure 21 bar [ 300 PSI]
Max. Flow 19 l/min [5 GPM]
Max. Differential

Between Steering Unit 28°C

and System Temperature 50°F
Max. System Operating Temperature 93°C [200° F]
Input Torque

Powered -Standard 1,7 - 2,8 Nm @ 6,9 bar tank pressure

[15 - 25 lb-in @ 100 PSI tank pressure]

Low 1,1 - 2,0 Nm @ 6,9 bar tank pressure

[10 - 17.5 lb-in @ 100 PSI tank pressure]

Max. Non Powered 81,4 Nm [60 lb-ft]
Fluid Petroleum Based Fluids
Recommended Filtration ISO 18/13 cleanliness level
Port Options 9/16-18 SAE O-ring

– 06 STC

3/8 BSP Straight thread ports
Check Valve for Manual Steering Yes
Optional Relief Valve Settings

bar [PSI] 40 [ 580]

50 [ 725]

63 [ 914]

70 [1015]

80 [1160]

90 [1305]

100 [1450]

125 [1812]

Option 1: Square Housing
with Side Ports

refer to Model Code, page 23

Option 2: Round Housing
with End Ports

refer to Model Code, page 24

Features

• Open Center

• Load Sensing

• Open Center
Power Beyond

• Integral Column

• Manual Steering
Check V alv e

• Inlet Relief Valve

• Load Sense Relief Valve

• Cylinder Relief Valve

• Anti-Cavitation Valve

Applications

• Lawn and Garden
Equipment

• T urf Equipment

• Golf Course
Maintenance
Equipment

• Lift Trucks

• Compact Utility Tractors

EATON Steering Catalog C-STOV-MC001-E1 May 2006 23

Steering Control
Units—Series 5

Model Code –
Ordering
Information

The following 30-digit coding system has been developed to
identify all of the configuration options for the Series 5
steering control units. Use this model code to specify a unit
with the desired features. All 30-digits of the code must be
present when ordering. You may want to photocopy the
matrix below to ensure that each number is entered in the
correct box.

Nos Feature Code Description Nos Feature Code Description

1,2,3 Product Series ABR Series 5 Steering Control Unit
4 Nominal Flow 1 11 l/min [3 GPM]

Rating B 19 l/min [5 GPM]

5 Inlet Pressure C 140 bar [2030 PSI]

Rating

6 Tank Pressure A 10 bar [150 PSI]

Rating B 21 bar [30 0 PSI]

7-8 Displacement 35 31.5 cm3/r [1.92 in3/r]

37 39.5 cm3/r [2.41 in3/r]
39 50.8 cm3/r [3.10 in3/r]
41 63.1 cm3/r [3.85 in3/r]
43 73.8 cm3/r [4.50 in3/r]
46 100 cm3/r [6.10 in3/r]

48 120 cm3/r [7.33 in3/r]

9 Flow Amplification 0 None
10 Neutral Circuit A Open Center

B Open Center, Power Beyond

F Load Sensing, Dynamic signal

11 Load Circuit A Non-Load Reaction
12,13 Valve Options 01 Manual Steering Check Valve

04 Inlet Check Valve, Manual

Steering Check Valve

05 Inlet Relief Valve,

Manual Steering Check Valve

12 Cylinder Relief Valve,

Anti-Cavitation Valve,
Inlet Relief Valve,
Inlet Check Valve,
Manual Steering Check Valve.

13 Cylinder Relief Valve,

Anti-cavitation Valve, Inlet Check
Valve, Load Sensing Relief Valve,
Manual Steering Check Valve

14,15 Integral Inlet 0 0 None

Relief Valve 18 40 bar [580 PSI]
Setting 1J 50 bar [725 PSI]

1Z 63 bar [914 PSI]

26 70 bar [1015 PSI]

2G 80 bar [1160 PSI]

2T 90 bar [1305 PSI]

34 100 bar [1450 PSI]

3W 125 bar [1812 PSI]

16,17 Cylinder Relief 00 None

Setting 37 103 bar [1490 PSI]

42 130 bar [1890 PSI]

55 185 bar [2680 PSI]

68 200 bar [2900 PSI]

18,1 9,20,21 Ports and 4AAN Square 4 x 9/16 SAE Ports,

Mounting Threads M10 x 1,5 Column Mounting

Threads (Use with Open Center)

4AKN Square 5 x 9/16 SAE Ports,

M10 x 1,5 Column Mounting
Threads (Use with Excess Flow)

4AEN Square 5 x 9/16 SAE Ports,

M10 x 1,5 Column Mounting
Threads (Use with Load Sense)

UAAN Square 4 x -06 STC Direct

Ports, M10 x 1,5 Column
Mounting Threads (Use with
Open Center)

UBNN Square 5 x -06 STC Direct

Ports, M10 x 1,5 Column
Mounting Threads
(Use with Excess Flow)

UBPN Square 5 x -06 STC Direct

Ports, M10 x 1,5 Column
Mounting Threads
(Use with Load Sense)

YAAN Square 4 x G .375 BSP Striaght

Thd. Ports, M10 x 1,5 Column
Mounting Threads
(Use with Open Center)

YBRN Square 5 x G .375 BSP Striaght

Thd. Ports, M10 x 1,5 Column
Mounting Threads
(Use with Load Sense)

22 Input Torque 1 Low*

3 Standard

23 Fluid Type A See Eaton Tec hnical

Bulletin 3-401

24 Special Application 0 None
25,26 Special Feature AA None
27 Paint 1 Black Primer
28 Identification 0 Eaton Product Number on

Nameplate

29 Mechanical A Tapered 17.919mm (.7055in)

Interface diameter, .083:1 and serrated

17.5 (.688) diameter, 40 tooth,

M16x1.5-6g, Extension length

65.02 (2.56)

D Internal involute spline12 tooth,

16/32 DP, 30 degree PA

30 Eaton Assigned B Assigned Design Code

Design Code

* All low torque units need approval from an Eaton Steering Engineer.

Square Housing with Side Ports - Option 1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

A B R 0 A A 0 1 0 B

C A

24 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006

Steering Control
Units—Series 5

Model Code –
Ordering
Information

The following 30-digit coding system has been developed to
identify all of the configuration options for the Series 5 steering
control units. Use this model code to specify a unit with the
desired features. All 30-digits of the code must be present when
ordering. You may want to photocopy the matrix below to ensure
that each number is entered in the correct box.

Nos Feature Code Description Nos Feature Code Description

1,2,3 Product Series ABR Series 5 Steering Control Unit
4 Nominal Flow 1 11 l/min [3 GPM]

Rating B 19 l/min [5 GPM]

5 Inlet Pressure

Rating C 140 bar [2030 PSI]

6 Tank Pressure A 10 bar [150 PSI]

Rating

7-8 Displacement 35 31.5 cm3/r [1.92 in3/r]

37 39.5 cm3/r [2.41 in3/r]
39 50.8 cm3/r [3.10 in3/r]
41 63.1 cm3/r [3.85 in3/r]
43 73.8 cm3/r [4.50 in3/r]
46 100 cm3/r [6.10 in3/r]

48 120 cm3/r [7.33 in3/r]

9 Flow Amplification 0 None
10 Neutral Circuit A Open Center

B Open Center, Power Beyond

C Closed Center

F Load Sensing, Dynamic signal

11 Load Circuit A Non-Load Reaction
12,13 Valve Options 01 Manual Steering Check Valve

04 Inlet Check Valve, Manual

Steering Check Valve

05 Inlet Relief Valve,

Manual Steering Check Valve

12 Cylinder Relief Valve,

Anti-cavitation Valve,
Inlet Relief Valve,
Inlet Check Valve,
Manual Steering Check Valve.

14,15 Integral Inlet 0 0 None

Relief Valve 18 40 bar [580 PSI]
Setting 1J 50 bar [725 PSI]

1Z 63 bar [914 PSI]

26 70 bar [1020 PSI]

2G 80 bar [1160 PSI]

2T 90 bar [1310 PSI]

34 100 bar [1450 PSI]

3W 125 bar [1812 PSI]

4C 140 Bar [2030 PSI]

16,17 Cylinder Relief 00 None

Setting

18,1 9,20,21 Ports and VAAH Round 4 x 9/16 SAE Ports,

Mounting Threads M6 x 1,0 Column Mounting

Threads (Use with Open Center)

VAKH Round 5 x 9/16 SAE Ports,

M6 x 1,0 Column Mounting
Threads (Use with Excess Flow)

VAEH Round 5 x 9/16 SAE Ports,

M6 x 1,0 Column Mounting

WAAH Round 4 x -06 STC Direct Ports,

M6 x 1,0 Column Mounting
Threads (Use with Open Center)

WBNH Round 5 x -06 STC Direct Ports,

M6 x 1,0 Column Mounting
Threads (Use with Excess Flow)

WBPH Round 5 x -06 STC Direct Ports,

M6 x 1,0 Column Mounting
Threads (Use with Load Sense)

22 Input Torque 1 Low*

3 Standard

23 Fluid Type A See Eaton Tec hnical

Bulletin 3-401

24 Special Application 0 None
25,26 Special Feature AA None
27 Paint 1 Black Primer
28 Identification 0 Eaton Product Number on

Nameplate

29 Mechanical A Tapered 17.919mm (.7055in)

Interface diameter, .083:1 and serrated

17.5 (.688) diameter, 40 tooth,

M16x1.5-6g, Extension length

65.02 (2.56)

D Internal involute spline12 tooth,

16/32 DP, 30 degree PA

30 Eaton Assigned B Assigned Design Code

Design Code

* All low torque units need approval from an Eaton Steering Engineer.
** Plug-O ports rated to 103 bar [1500PSI]

Round Housing with End Ports - Option 2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

A B R 0 A 0 0 A 0 1 0 B

A

Option 1: Square Housing with Side Ports

refer to Model Code, page 23

Steering Control
Units—Series 5

Installation
Drawing

Relief Valve/Check
or Manual Check

Relief Valve/Check Manual Check

View of Gerotor Section

Gerotor Seal

Cylinder Relief Valve Anti-Cavitation Valve

Inlet Check Valve

Housing

PinBearing, Ball Drive Spacer Plate End Cap

O-ring

Bearing
Race

Shaft
Seal

Dust Seal

Centering Springs Sleeve Spool Gerotor

Sectional Drawing

EATON Steering Catalog C-STOV-MC001-E1 May 2006 25

Side View

Displacement Dim. A Max.

Code cm3/r [in3/r] mm [inch]

35 31.5 [1.92] 123.4 [4.86]
37 39.5 [2.41] 125.2 [4.93]
39 50.8 [3.10] 124.2 [4.89]
41 63.1 [3.85] 126.2 [4.97]
43 73.8 [4.50] 128.0 [5.04]
46 100.0 [6.10] 132.3 [5.21]
48 120.0 [7.33] 135.4 [5.33]

4X M10 x 1.5-6H
15,2 [.60] Min

44,4 [1.75] Dia.

Involute Spline
12 Tooth 16/32 D.P.
30° P.A. PER SPC DS-023-2

48.26+0.13

29,18

58.37

[1.149]

[1.900+.005]

[2.298]

38,4
[1.51]MAX

58,37
[2.298]

78,5
[3.09]MAX

40,6
[1.60] MAX

58,37
[2.298]

29,18
[1.149]

26 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006

Option 3: Square Housing with End Ports

refer to Model Code, page 24

Steering Control
Units—Series 5

Installation
Drawing

Option 2: Round Housing with End Ports

Sectional Drawing

11 Pin
10 Sleeve
8 Drive
3 O-ring
5 Gerotor
2 End cap
22 Dust seal
16 Bearing
15 Race
21 Quad seal
23 Retaining ring
7 Wear plate
6 housing

Displacement Dim. A Max.

cm3/r [in3/r] mm [inch]

31.5 [1.92] 135.1 [5.32]

39.5 [2.41] 137.2 [5.40]

50.8 [3.10] 136.1 [5.36]

63.1 [3.85] 137.9 [5.43]

73.8 [4.50] 139.7 [5.50]
100 [6.10] 144 [5.67]
120 [7.33] 147.3 [5.80]

Involute Spline
12 Tooth 16/32 D.P.
30° P.A.

59,00
[2.323] Dia.

[3.17] MAX
4 x M6 x 1.0-6H
12,2 [.48] Min. Depth

20,3±0,5

[.80±.02]

19,8±0,5

[.78±.02]

Pressure Port

13,7±0,5
[.54±.02]

23,6±0,5
[.93±.02]

5X .5625-18
UNF-2B SAE
O-Ring Port

Left Port

[1.75] MAX

80,5

11,4±0,5
[.45±.02]

44,4

26,4±0,5
[1.04±.02]

[2.750±.002] Dia.

80,5

[3.17] MAX

Additional Port

8,9±0,5

[.35±.02]

Right Port

Tank Port

69,85±0,05

[.57±.02]

14,5±0,5

28,6

[1.126] MAX Dia.

27,9±0,5

[1.10±.02]

9,1

[.36] MAX

25,7

[1.01] MAX Dia.

5,1±0.8

[.20±.03]

A

9,9
[.39] MIN

8,9
[.35] MIN

11

10

VIEW B

16

15

22

23

D

D

VIEW B

21

6

3

8

5

C

C

7

2

EATON Steering Catalog C-STOV-MC001-E1 May 2006 27

Steering Control
Units—Series 5

Performance Data

Neutral Pressure Drop
Inlet to Auxiliary

Relief V alve Curve

Input T orque Curve

bar

8
6

4

2

0

0

bar

14

10

6
2

8

[2]

11 L/min [3 GPM] Rated Round Unit

4

[1]

19 L/Min (5 GPM) Rated Unit

11
[3]

7

[2]

L/min [GPM]

15

[4]

L/min [GPM]

11

[3]

19

[5]

23

[6]

15

[4]

[PSI]
[120]

[ 80]

[ 40]

[ 0]

[PSI]

[250]
[200]
[150]
[100]

[ 50]

[ 0]

1 3 5 7 9 11 13 15

135

125
115

105

95

85

bar

75

65

55

45

35

0

0

3

L/min

2000
1900
1800
1700
1600
1500
1400
1300
1200

PSI

1100
1000

900
800
700
600
500

1234

GPM

0

25

20

2

1

0 102030405060708090100

Percent Deflection

Standard torque

Low torque

in-lbNm

15

10

28 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006

Tapered 17.919mm (.7055in)
diameter, .083:1 and serrated

17.5 (.688) diameter, 40 tooth,
M16x1.5-6g, Extension length

65.02 (2.56)

M16 x 1.5-6g

.0831:1

65.0 ± 0.5

[2.56 ± .02]

9.1

[.36] MAX

25.7

[1.01] MAX

19.2

[.755] MAX

14.27 ± 0.25
[.562 ± .010]

29.36 ± 0.25

[1.156 ± .010]

17.919

[.7055]

Steering Control
Units—Series 5

Integral Column
Option

Integral Column
Option Av ailable in
Square Housing with
Side Ports, and Round
Housing with End
Ports

40 T ooth Serrated Integral
Column Option (Shown on
Round Housing with End
Ports)

12 Tooth Internal Spline
Standard Mechanical Interface
(Shown on Round Housing
with End Ports)

69,85±0,05
[2.750±.002] Dia.

28,6

[1.126] MAX Dia.

Internal Involute Spline
12 Tooth 16/32 D.P.
30° P.A.

9,1

[.36] MAX

25,7

[1.01] MAX Dia.

5,1±0,8

[.20±.03]

A

9,9
[.39] MIN

8,9
[.35] MIN

Steering Control
Units—Series 10

Product Description

Eaton’s Series 10 Steering
Control Unit (SCU) facilitates
hydraulic fluid flow like no
other unit on the market.
This highly-engineered product
is the ultimate SCU for
mid-range flow applications.

Benefits

• The new Series 10 SCU
has an unprecedented,
continuous pressure
rating of 275 bar (4000
psi), making it ideal for
heavy-duty equipment,
such as construction
and agricultural
machinery.

• Its high-pressure
rating reduces overall
equipment costs, since
smaller cylinder sizes
can be assigned into
the system.

• The new Series 10
incorporates proven
Eaton technologies. An
internal, balanced
architecture and a wide­walled sleeve that is
40% thicker than
standard designs offer

increased performance

during transient
pressure conditions.

Features

• Open Center

• Power Beyond

• Closed Center

• Load Sensing

• Integral Valves

• Q-Amp

• 2-Speed

• Dual Displacement

• V ersa Steer

• Wide Angle

• Cylinder Damping

Applications

• Construction Machinery

• Agriculture Machinery

• Heavy-Duty Equipment

• Marine

• Forestry Machinery

• Mining Equipment

SPECIFICATIONS

Max. System Pressure 275 bar [4000 PSI]
Max. Back Pressure 21 bar [305 PSI]
Rated Flow

– Low 7,6 - 15 l/min [ 2 - 4 GPM]
– Medium 15 - 30 l/min [ 4 - 8 GPM]
– High 30 - 61 l/min [ 8 - 16 GPM]
– Low (with Q-Amp) 8 - 19 l/min [ 2 - 5 GPM]
– Medium (with Q-Amp) 19 - 38 l/min [ 5 - 10 GPM]
– High (with Q-Amp) 38 - 76 l/min [10 - 20 GPM]

Max. Differential

Between Steering Unit
and System Temperature 28° C [50° F]

Max. System

Operating Temperature 93°C [200° F]

Input Torque

Powered 1,1-2,8 Nm @ 6,9 bar back pressure

[10-25 lb-in @ 100 PSI back pressure]

Non-Powered 136 Nm [100 lb-ft]
Fluid See Eaton Technical Bulletin 3-401
Recommended Filtration ISO 18/13 cleanliness level

PORT SIZES:

Work Ports (4) Load Sense (LS) Port (1)*
3/4-16 (SAE) 7/16-20
M18 x 1,5 - 6H M12 x 1,5 - 6H
G 1/2 (BSP) Straight Thread G 1/4 (BSP) Straight Thread
STC Dash 08** STC Dash 06**

*Top or side when applicable

**STC

®

Ports, Aeroquip patented, feature snap to connect technology

EATON Steering Catalog C-STOV-MC001-E1 May 2006 29

Steering Control

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

30 31 32

A D R AAAAA01AA

Model Code — Series 10 Steering Control Units

Units—Series 10

Model Code—
Ordering
Information

The following 32-digit coding system has been developed to
identify all of the configuration options for the Series 10
steering control units. Use this model code to specify a unit
with the desired features. All 32-digits of the code must be
present when ordering. You may want to photocopy the
matrix below to ensure that each number is entered in the
correct box.

Nos Feature Code Description Nos Feature Code Description

1,2,3 Product Series ADR Series 10 Steering Control

4 Unit Type A Standard

5 Nominal Flow Rating 1 11 l/min [3 GPM]

6 Inlet Pressure Rating 1 276 bar [4000 PSI]—(Load

7 Return Pressure A 21 bar [305 PSI] Max.—

Rating (standard rating*)

8-9 Displacement 01 352 [21.5] / 60 [3.6]

cm3/r [in3/r] — 02 218 [13.3] / 60 [3.6]
Dual Displacement 03 290 [17.7] / 60 [ 3.6]
Combined/Manual 04 440 [26.8] / 146 [8.9]

8-9 Displacement 40 60 [3.6]

cm3/r [in3/r] 43 75 [4.5]

Unit

B Dual Displacement
C Wide Angle
D 2-Speed

E 2-Speed with Wide Angle
G Dual Displacement with Wide

Angle

V Versa Steer, Wide Angle

(Open Center)

2 23 l/min [6 GPM]

(Closed Center and LS)

3 45 l/min [12 GPM]

(OC, CC, and LS)

4 19 l/min [5 GPM]

(Q-Amp)

5 38 l/min [10 GPM]

(Q-Amp)

6 76 l/min [20 GPM]

(Q-Amp)

7 23 l/min [6 GPM]

(Open Center)

sensing and closed center)

2 207 bar [3000 PSI]—

(Open center)

B 10 bar [145 PSI] Max.

05 231 [14.1] / 85 [5.2]

45 95 [5.9]
48 120 [7.3]
50 145 [8.9]
51 160 [9.7]
52 185 [11.3]
54 230 [14.1]
57 295 [17.9]
59 370 [22.6]
61 460 [28.2]
64 590 [35.9]
66 740 [45.1]

1-8 GPM

8-16 GPM

10 Flow Amplification** A None (No Q-Amp)

B 1.6 : 1.0 Ratio†
C 1.6 : 1.0 Ratio

(with Manual Steering)†

E 2.0 : 1.0 Ratio

(with Manual Steering)†

G 1.3 : 1.0 Ratio

(with Manual Steering)†

†Use with closed center or

load sensing only.

11 Neutral Circuit A Open Center

C Closed Center
D Load Sensing, Static Signal
E Load Sensing, Dynamic Signal

F Open center with

Power Beyond

12 Load Circuit A Non-Load Reaction

B Load Reaction (Open Center

3,8 - 30 l/min [1 - 8 GPM] Only

D Non-Load Reaction,

Cylinder Damped

13,14 Special Spool/Sleeve 00 None

Modification

15,16 Valve Options

Manual Load Inlet Cylinder Anti- Inlet

Steering Sensing Check Relief Cavitation Relief

Check Relief Valve Valve Valve Valve

01 •

02 • •

03 • •

04 • • •

05 • •

06 • • •

07 • • •

08 • • • •

09 • • • • •

10• ••• •

11 • • •

* 12 GPM open center requires 145psi back pressure
** All Q-amp applications need approval from an Eaton Applications Engineer

30 EATON Char-Lynn Steering Catalog C-STOV-MC0 01-E1 July 2006

Continued on next page