Bosch Rexroth SB24/34 User manual

Instruction manual
RE 66170-B/2019-05-15 English
Load-sensing control block
SB24/34
for mobile applications

©BoschRexrothAG2019. Allrights reserved,
also regarding any disposal, exploitation,
reproduction, editing, distribution, aswell
asinthe event ofapplications forindustrial
property rights.
The data specified within only serves
todescribe the product. No statements
concerning acertain condition orsuitability
foracertain application can bederived from
our information. The information given does
not release the user from the obligation
ofown judgment and verification. It must be
remembered that our products are subject to
anatural process of wear and aging.
The cover shows an example application. The
product delivered may differ from the image on
the cover.
The original instruction manual was created in
the German language.

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3/78Contents
Contents
1 About this documentation 5
1.1 Validity of the documentation 5
1.2 Required and supplementary documentation 5
1.3 Representation of information 6
1.3.1 Safety instructions 6
1.3.2 Symbols 7
1.3.3 Designations 7
1.3.4 Abbreviations 8
2 Safety instructions 9
2.1 About this chapter 9
2.2 Intended use 9
2.3 Improper use 10
2.4 Personnel qualifications 10
2.5 General safety instructions 10
2.6 Product-specific safety instructions 11
2.7 Personal protective equipment 13
3 General instructions on property damage and product damage 14
4 Scope of delivery 17
5 About these products 18
5.1 Performance description 18
5.2 Product identification 18
5.3 Product description 19
5.3.1 Definition of control block segments 19
5.3.2 Types of actuation 20
5.3.3 Definition of control block segment sides 20
5.3.4 Port designation 21
5.3.5 Flange figure 21
5.3.6 Connecting plate for fixed pump (C2) 22
5.3.7 Connecting plate for fixed pump (C4) 23
5.3.8 Connecting plate (C3) 25
5.3.9 Connecting plate for variable pump (C6) 26
5.3.10 Hitch control valve EHR24-EM2 28
5.3.11 Hitch control valve EHR24-EHS 30
5.3.12 Control valveSB24-M without individual pressure compensator 33
5.3.13 Control valveSB24-M with individual pressure compensator 35
5.3.14 Control valve SB24-EHS 38
5.3.15 Control valveSB34-EHS 40
5.3.16 End plate (E1) 42
5.3.17 End plate (E2) 43
5.3.18 Central connecting plate 44
5.3.19 Intermediate plate 46
5.4 Control block versions 47
5.4.1 Examples for control blocks with connecting plate, end plate and central
connecting plate 47
5.4.2 Examples for control blocks with connecting plate or end valve 48
5.5 Combination options 49

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6 Transport and storage 52
6.1 Transporting the control block/control block segment 52
6.1.1 Transport by hand 52
6.1.2 Transport with lifting gear 52
6.2 Storage of control block/control block segment 53
7 Installation 55
7.1 Unpacking 55
7.2 Assembly of control block segments to form a control block 55
7.3 Painting the control block/control block segment 55
7.4 Installation conditions 56
7.5 Installation position 56
7.6 Assembly of the control block/control block segment 56
7.6.1 Preparation 56
7.6.2 Attachment of the control block/control block segment 56
7.6.3 Completion of assembly 57
7.6.4 Mechanical connection of the control block/control block segment 57
7.6.5 Hydraulic connection of the control block/control block segment 58
7.6.6 Customer-specific coupling connection 60
7.6.7 Electric connection of the control block/control block segment 61
8 Commissioning 62
8.1 Before initial commissioning 62
8.2 Initial commissioning 63
8.3 Air bleeding 64
8.3.1 Air bleeding at control block/control block segment 64
8.3.2 Air bleeding at SB control valves 64
8.3.3 Air bleeding at control valves with EHS 65
8.3.4 Air bleeding at EHR control valves 66
8.4 Recommissioning after standstill 66
9 Operation 67
9.1 Software description 67
10 Maintenance and repair 68
10.1 Cleaning and care 68
10.2 Inspection and maintenance 68
10.3 Repair 68
10.4 Spare parts 69
11 Removal and replacement 70
11.1 Required tools 70
11.2 Preparing for removal 70
11.3 Removal of control block/control block segment from machine 70
11.4 Preparing the components for storage or further use 70
12 Disposal 71
13 Extension and conversion 72
14 Troubleshooting 73
14.1 How to proceed for troubleshooting 73
14.2 Malfunction table 74
15 Technical data 75
16 Alphabetical index 76
Contents

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1 About this documentation
1.1 Validity of the documentation
This documentation applies for load-sensing control blocksSB24/34 of
BoschRexroth including the following control block segments:
• Connecting plate, central connecting plate, intermediate plate and end plate
• Control valvesSB24-M, SB24-EHS and SB34-EHS
• Control valvesEHR24-EHS and EHR24-EM2
This documentation applies for all mentioned control blocks and control block
segments independent from their manufacturing date until new revision of
thisdocument.
This documentation is intended for machine/system manufacturers as well as
authorized specialists and dealers.
This documentation contains important information on safe and proper transport,
installation and disassembly, commissioning, operation, maintenance and servicing
of the product.
▶ Read this documentation completely and in particular the chapters2 "Safety
instructions" on page9 and3 "General instructions on property damage and
product damage" on page14 before starting to work with the control block/
control block segment.
1.2 Required and supplementary documentation
▶ Only commission the product if the documentation marked with the
book symbol is available, understood and complied with.
Table 1: Required and supplementary documentation
Title Document number Document type
Technical data sheet
Contains the permissible technical data.
Please bear in mind that different technical data sheets apply
depending on the version:
Data sheet
Load-sensing control block SB24/34 66170
Load-sensing directional valves in sandwich plate design
SB24-EHS, SB34-EHS
66171
Load-sensing directional valves in sandwich plate design SB24-M 66172
Plates SB24, SB34 66173
Hitch control valves EHR5, EHR24-EM2, EHR24-EHS 66126
Load-sensing control blockSB24/34
Contains all information required for directional valve installation
66170-10-R Manual
Order confirmation
Contains the order-related technical data of the control block.
Order confirmation
Offer drawing
Contains the outer dimensions, all connections and the hydraulic
circuitdiagram of the control block.
Offer drawing

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Table 1: Required and supplementary documentation
Title Document number Document type
Hydraulic fluids based on mineral oils and related hydrocarbons
Describes the requirements for hydraulic fluids on mineral oil basis and
related hydrocarbons for operation with Rexroth hydraulic components,
and provides support for selection of suitable hydraulic fluids for the
hydraulic system.
90220 Data sheet
Environmentally acceptable hydraulic fluids
Describes the requirements for environmentally acceptable hydraulic
fluids on mineral oil basis and related hydrocarbons for operation with
Rexrothhydraulic components, and provides support for selection of
suitable hydraulic fluids for the hydraulic system.
90221 Data sheet
For further documentation on installation and repair, refer toTable 36 on
page69 or visit Rexroth on
www.boschrexroth.com/mobile-hydraulics-catalog.
1.3 Representation of information
Standardized safety instructions, symbols, terms and abbreviations are used
throughout this documentation to ensure safe and proper use of the product.
Forclarification, they are explained in the sections below.
1.3.1 Safety instructions
This documentation includes safety instructions in chapters2.6 "Product-specific
safety instructions" on page11 and3 "General instructions on property damage
and product damage" on page14, as well as prior to sequences of actions or
instructions with risk of injury or property damage. Always follow the measures
fordanger prevention associated with the use of this product.
Safety instructions are set out as follows:
SIGNAL WORD
Type and source of danger
Consequences of noncompliance
▶ Measures to prevent danger
•Warning sign: draws attention to the danger
•Signal word: identifies the degree of the danger
•Type and source of danger: indicates the type and source of the danger
•Consequences: describes what occurs if safety instructions are disregarded
•Precautions: states how the danger can be avoided

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Table 2: Hazard classes as defined in ANSIZ535.6
Warning sign, signal word Meaning
DANGER Identifies a dangerous situation that will result in death or
serious injury if it is not avoided.
WARNING Identifies a dangerous situation that may result in death or
serious injury if it is not avoided.
CAUTION Identifies a dangerous situation that may result in minor to
moderate injury if it is not avoided.
NOTICE Property damage: The product or surrounding area may
bedamaged.
1.3.2 Symbols
The following symbols indicate information that is not safety-relevant but increases
understanding of the documentation.
Table 3: Meaning of symbols
Symbol Meaning
If this information is disregarded, the product cannot be used and/or
operated to its full extent.
▶ Single, independent action
1.
2.
3.
Numbered instruction:
The numbers indicate that the actions must be completed in order.
Black circle with white number:
Auxiliary marking for a better understanding.
White circle with black number: Position or assembly group with reference
to the parts list and to the graphics within a chapter.
White circle with black letters: Assembly group with reference to the parts
list and to the graphics within a chapter.
1.3.3 Designations
This documentation uses the following designations:
Table 4: Designations
Designation Meaning
SB24-M Control valve with mechanical control
SB24-EHS/SB34-EHS Control valve with CAN bus-controlled electrohydraulic actuating unit
EHR24-EHS Control valve with CAN bus-controlled electrohydraulic actuating unit for
electrohydraulic hitch control
EHR24-EM2 Control valve with PWM signal-controlled electrohydraulic hitch control
Control valve Directional valve type SB
Control valve Directional valve type EHR
Control spool Main spool
actuation Type of control spool actuation

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1.3.4 Abbreviations
This documentation uses the following abbreviations:
Table 5: Abbreviations
Abbreviation Meaning
AP Connecting plate
CAN Controller Area Network
CVL Connection valve (with LS signaling direction from right to left)
da Double-acting
PRV Pressure relief valve
DIN German Industrial Standard
DMV Pressure reducing valve
EHR Electrohydraulic hitch control
EHS Electrohydraulic actuating unit
EVL End valve (with LS signaling direction from right to left)
EP End plate
IPC Individual pressure compensator
ISO International Organization for Standardization
PWM Pulse width modulation
RV Non-return valve
sa Single-acting
SPV Check valve
ZAP Central connecting plate
ZP Intermediate plate

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2 Safety instructions
2.1 About this chapter
The product has been manufactured in accordance with generally accepted
engineering standards. There is still, however, a risk of personal injury or property
damage if this chapter and the safety instructions in this documentation are
notobserved.
▶ Read this documentation completely and thoroughly before working with the
product.
▶ Keep it in a location where it is accessible to all users at all times.
▶ Always include the required documentation when passing the product on to
thirdparties.
2.2 Intended use
Control blocks/control block segments are hydraulic components, meaning that in
their application area they are classified neither as complete nor as partly completed
machinery as defined in the EC Machinery Directive2006/42/EC. The component
is exclusively intended to form partly completed machinery or complete machinery
together with other components. The component may only be commissioned after it
has been installed in the machine for which it is intended and the safety of the entire
system has been established in accordance with the machinery directive.
The control blocks/control block segments have been developed for applications
in the working hydraulics of agricultural machinery. Deviating use is only permitted
following consultation with BoschRexroth.
▶ Observe the technical data, the application and operating conditions and the
performance limits as specified in the data sheet and in the order confirmation.
Information about approved hydraulic fluids can be found in the corresponding
datasheet.
Intended use includes having completely read and understood this documentation
and particularly chapter2 "Safety instructions" on page9.

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2.3 Improper use
Any use other than that described as intended use is considered improper.
BoschRexrothAG is not liable for damages resulting from improper use. The user
issolely responsible for any risks arising from improper use.
The following foreseeable forms of faulty usage are also considered improper
(thislist is not exhaustive):
• Use outside the operating parameters approved in the data sheet or in the order
confirmation (unless specifically approved by the customer)
• Use of non-approved fluids, e.g., water or polyurethane components
• Application of the control block/control block segment in potentially explosive
environments
2.4 Personnel qualifications
The activities described in this documentation require a basic understanding of
mechanics, electricity and hydraulics, as well as familiarity with associated technical
terms. For transporting and handling the product, knowledge regarding the use of
lifting gear and lifting accessories is required. Skilled personnel refers to persons
who possess the professional training, knowledge and experience, as well as the
understanding of the regulations relevant to the work to be done that are necessary
to recognize possible dangers and take the appropriate safety measures. Skilled
personnel must follow the rules relevant to their field and have the necessary
hydraulic expert knowledge.
Hydraulic expert knowledge includes:
• Being able to read and fully understand hydraulic circuit diagrams and
• Knowledge regarding the function and interaction of hydraulic components.
Bosch Rexroth offers you measures supporting training in specific areas. For an
overview of the training contents, visit our website under:
www.boschrexroth.com/training
2.5 General safety instructions
• Observe applicable accident prevention and environmental protection regulations.
• Observe the safety regulations of the country in which the product is
used/operated.
• For Germany, the following applies: Hydraulic machinery/systems are "facilities for
handling substances hazardous to water in accordance with the German Federal
Water Act (WHG)". Sections1 and 19 WHG (§19g, 19i, 19l) in particular must be
complied with in this respect.
• Use Rexroth products only when they are in good working order.
• Do not install, operate, remove or maintain Rexroth products if under the influence
of alcohol, drugs or medication that may affect your reaction time.

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• Only use genuine Rexroth accessories and spare parts to ensure there is no risk to
personnel from unsuitable spare parts.
• Observe the technical data and ambient conditions specified in the product
documentation.
• If unsuitable products are installed or used in applications that are of relevance to
safety, unexpected operating conditions may occur in the application, which could
result in personal injury or property damage. For this reason, only use the product
in safety-relevant applications if this use is expressly indicated and approved
in the product documentation, e.g., in safety-related parts of a control system
(functionalsafety).
• Only commission the product if it has been determined that the end product
(e.g.,machinery or system) in which the Rexroth products are installed
complieswith the country-specific provisions, safety regulations and standards
forthe application.
• Use tools appropriate for the work being performed and wear appropriate
protective clothing to prevent punctures and cuts.
2.6 Product-specific safety instructions
The following safety instructions apply for chapters6 to 14.
WARNING
Danger during transport!
Danger to life, risk of injury or property damage!
In the event of inappropriate transport, the control block/control block segment
may be dropped and cause injury, e.g. bruises or fractures and/or damage to
theproduct.
▶ Make sure that the lifting capacity of the lifting gear is sufficient to safely bear
the weight of the control block/control block segment.
▶ Never step or grip under suspended loads.
▶ Ensure a stable transport position.
▶ Use your personal protective equipment (e.g. safety goggles, safety gloves,
suitable working clothes, safety shoes).
▶ Use suitable lifting gear for transport.
▶ Observe the prescribed position of the lifting strap.
▶ Observe the national laws and specifications of occupational safety and health
and transport.

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WARNING
System/machine under pressure!
Danger to life or risk of injury, severe bodily injury when working on machines
which have not been put to a standstill! Property damage!
▶ Switch off the entire system and secure it against reactivation according to the
parameters provided by the machine/system manufacturer.
▶ Ensure that all relevant components of the hydraulic system are depressurized.
For this purpose, observe the parameters indicated bythemachine/
systemmanufacturer.
▶ Please note that the hydraulic system might still be pressurized event after
separation from the actual pressure supply.
▶ Do not disconnect any line connections, ports or components as long as the
hydraulic system is under pressure.
Escaping hydraulic fluid mist!
Risk of explosion and fire hazard, health hazard, risk of environmental pollution!
▶ Depressurize the relevant machine/system component and repair the leak.
▶ Keep open flames and ignition sources away from the control block/control
block segment.
▶ If control blocks/control block segments are located in the vicinity of ignition
sources or powerful thermal radiators, a shield must be erected to ensure
any escaping hydraulic fluid cannot be ignited, and to protect hose lines
frompremature aging.
Electrical voltage!
Danger to life or risk of injury due to electric shock or property damage!
▶ Always disconnect the voltage supply to the relevant machine/system part
before installing the product and/or connecting or disconnecting the connector.
▶ Protect the machine/system against being re-energized.
Disturbance of control functions due to contamination!
Risk of injury or property damage!
Under certain circumstances, moving parts in control equipment
(e.g.controlspool) can get stuck in an undefined position due to contamination
(e.g.impurehydraulic fluid, abrasion or residual dirt from components). As
a result, the activated consumer does no longer respond correctly to the
operator’sspecifications.
▶ Comply with the prescribed cleanliness level of the hydraulic fluid in
accordancewith the datasheet.
Danger caused by pressurized, leaking hydraulic fluid!
Risk of death or injury due to leaking hydraulic fluid streams! Leakage at the
control block/control block segment can lead to hydraulic fluid escaping under
highpressure.
▶ Depressurize the relevant machine/system component and repair the leak.
▶ Never attempt to block or seal the leak or hydraulic fluid jet with a cloth.

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CAUTION
Risk of injury due to sharp edges and rough surfaces!
When working on and transporting the control block/control block segment,
there is a risk of injury, e.g. due to sharp edges at the valve housing, threads
orattachments.
▶ Wear appropriate personal protective equipment (e.g. safety shoes, safety
goggles, safety gloves and suitable working clothes).
Danger of bruising and knocks for limbs!
In the gap between the actuation element and the valve housing, there is a risk
ofinjury
▶ Do not move any limbs into the gap between the actuation element/hand lever
and the valve housing.
Hot surfaces at control block/control block segment!
Risk of burning!
▶ Allow the control block/control block segment to cool down sufficiently before
touching it.
▶ Protect yourself with heat-resistant protective clothing, e.g. gloves.
Contact with hydraulic fluid!
Danger to health / damage to health, e.g. eye injury, skin damage, toxication in the
event of inhalation!
▶ Avoid any contact with hydraulic fluids.
▶ When handling hydraulic fluids, the safety instructions of the lubricant
manufacturer need to be observed at all times.
▶ Use your personal protective equipment (e.g. safety goggles, safety gloves,
suitable working clothes, safety shoes).
▶ Immediately seek medical attention, however, if hydraulic fluid gets into your
eyes or blood circuit or if you swallow it accidentally.
Danger from improper handling!
Slip hazard! When using the control block/control block segment as climbing aid,
there is a danger of slipping on wet and/or fluid-afflicted surfaces.
▶ Do not use the control block/control block segment as handle or step.
▶ Check how to safely get on top of the machine/system.
2.7 Personal protective equipment
The personal protective equipment is the responsibility of the user of the control
block/control block segment. Observe the safety regulations in your country.
All pieces of personal protective equipment should be intact.

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3 General instructions on property
damage and product damage
The following safety instructions apply for chapters6 to 14.
NOTICE
Danger from improper handling!
Product can be damaged!
▶ Do not expose the product to any mechanical, hydraulic or electric loads under
any circumstances.
▶ Never use the product as handle or step.
▶ During transport, do not lift the control block/control block segment at sensitive
attachments (e.g., actuation elements, sensors, solenoids, or valves).
▶ Carefully place the control block/control block segment onto the contact
surface and secure it against falling to prevent damage.
▶ Do not put/place any objects on the product.
▶ Do not set/place the control block/control block segment on actuation
elements.
▶ Do not hit sensitive attachments (e.g. sensors, solenoids or actuation elements).
▶ Sealing surfaces must not be damaged.
▶ Do not remove the transport protection until actual assembly at the control
block/control block segment.
▶ Ensure that the electronic components (e.g. sensors) are not electro-statically
charged (e.g. during painting operations).
Risk of property damage due to inadequate lubrication!
Product can be damaged or destroyed!
▶ When commissioning the control block/control block segment, always ensure
that there is enough hydraulic fluid in the system.
▶ When commissioning a machine/system, make sure that the housing area and
the working lines of the control block/control block segment are filled with
hydraulic fluid and remain filled during operation.
Ingress of fluids and foreign bodies due to lacking sealings and locks!
Loss of the protection class and danger of short circuit!
▶ Before the assembly, ensure that all sealings and locks of the plug-in connection
are tight.

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NOTICE
Mixing hydraulic fluids!
Product can be damaged!
▶ Observe the viscosity and cleanliness level specified in the datasheet for
hydraulic fluids.
▶ Mixture of different hydraulic fluids can lead to damage at the control
block/control block segment due to chemical reactions and changes in
properties.
▶ Ensure compatibility of different hydraulic fluids according to manufacturer's
specifications.
Contamination of hydraulic fluid!
The cleanliness of the hydraulic fluid has a considerable impact on the service life
of the product. Contaminations of the hydraulic fluid may lead to premature wear
and malfunctions!
▶ Make sure that the working environment at the installation site is fully free of
dust and foreign substances in order to prevent foreign particles from getting
into the hydraulic lines and causing product wear and malfunctions. The control
block/control block segment must be installed in a clean condition.
▶ Only use clean ports, hydraulic lines and attachments (e.g. measuring devices).
▶ When plugging the ports, no contamination may ingress.
▶ Before commissioning, ensure that all hydraulic connections are tight and
that all seals and plugs of the plug-in connection are correctly installed and
undamaged to prevent fluids and foreign particles from entering the product.
Improper cleaning
Product can be damaged!
▶ Plug all openings with suitable protective devices to prevent cleaning agents
from entering the product.
▶ Never use solvents or aggressive cleaning agents. Use only water and, if
necessary, a mild cleaning agent to clean the product.
▶ Do not point high-pressure cleaners at sensitive components, e.g.rubber parts,
electrical connections (solenoids and sensors), and actuation elements.
▶ Use fiber-free cleaning cloths for cleaning.
Environmental pollution due to incorrect disposal!
Careless disposal of the control block/control block segment and its attachments,
the hydraulic fluid and the packaging material can cause environmental pollution!
▶ Dispose of the control block/control block segment, hydraulic fluid, and
packaging in accordance with the national regulations in your country.
▶ Dispose of the hydraulic fluid in accordance with the applicable safety
datasheet of the hydraulic fluid.

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NOTICE
Danger due to chemical or aggressive environmental conditions!
Product can be damaged! If the control block/control block segment is exposed to
chemical or aggressive environmental conditions, corrosion and even malfunctions
may occur. Leaks may lead to a leakage of hydraulic fluid.
▶ Take suitable measures for protection of the control block/control block
segment against chemical and aggressive environmental conditions.
Escaping hydraulic fluid!
Environmental pollution and contamination of the ground water!
▶ When filling and draining hydraulic fluid, always place a drip tray under the
control block/control block segment.
▶ Use a suitable binding agent to collect any leaked hydraulic fluid.
▶ Observe the safety data sheet for the hydraulic fluid and the specifications
provided by the machine/system manufacturer.
Danger due to heat development in components!
Adjacent products may be damaged! Due to a heat development in components
(e.g.solenoids), adjacent products may be damaged during assembly if no
sufficient safety distance is complied with.
▶ When installing the control block/control block segment, check the distances to
nearby products to prevent any damage.
The warranty exclusively applies to the delivered configuration.
The warranty claim becomes void with
• Faulty installation, commissioning and operation,
• Improper use,
• Removal of the tamper-proof caps and seals (e.g.with pressure settings),
• Control of the settings at the factory,
• Unauthorized conversions and additional installations,
• Opening of the directional valve,
• Improper handling,
• Use of non-original spare parts by Rexroth.

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4 Scope of delivery
Included in the scope of delivery:
• Control block or control block segment according to order confirmation
The following parts are also assembled prior to delivery according to version:
• Protective covers
• Protective plugs/threaded plugs

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5 About these products
5.1 Performance description
Refer to the data sheet and the order confirmation for the technical data, operating
conditions and operating limits of the directional valves.
For the assignments of directional valves to data sheets, refer to chapter1.2
"Required and supplementary documentation" on page5.
5.2 Product identification
The product can be identified from the name plate.
The details on the name plate apply to the product as delivered. If modifications
have been made to the product in comparison to the delivery state, the name
plate information may not apply to the present product.
▶ Make sure that the name plates in place are not damaged.
▶ Compare the material number of the product on the respective name plate with
the details on the offer drawing to verify that this instruction manual refers to
theproduct in question.
If in doubt, please contact BoschRexroth.
14
5
6
2
3
Fig. 1: Name plate (example)
1 Word mark (manufacturer)
2 Material number
3 Designation of origin
4 Manufacturing date
JJ w WW = Year w calendar week
5 Data Matrix code
6 Range/serial number
The information on the above name plate may vary depending on order-specific
requirements.
Any other labeling on the product is just for BoschRexroth-internal purposes.

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5.3 Product description
For a description of the layout and function of the control blocks and instructions on
configuring individual directional valves, refer to the datasheet.
For the assignments of directional valves to datasheets, refer to Table 1 "Required
and supplementary documentation" on page5.
5.3.1 Definition of control block segments
Control blocks are parts of hydraulic systems for control of actuators like tractor
attachments.
The control block includes various control block segments in sandwich plate design.
The control block segments have various functions and are structured as follows:
The connecting plate is equipped with the LS signal output (port Yo..). The
connecting plates are usually fitted with tie rod screws to slide on the block
segments. The flange surface is always fitted with O-rings in the flange surface
(flange surface O-ring side).
Connecting plates with inlet port (P..) are further distinguished as follows.
• Connecting plate for fixed pump
• Connecting plate for variable pump
The tie rods are screwed on both sides into the central connecting plate on which
the block segments are slid.
The EHR control valve serves for electrohydraulic hitch control and is controlled via
PWM pilot signal or CAN bus in a circuit with electronic control unit and sensors.
The control block is completed by the end valve version of the EHR control valve with
LS signaling direction from right to left (EVL).
The SB24/34 control valve serves for control of various actuators and is controlled
mechanically or via CAN bus.
The control block is completed by the connection valve (CVL) version of the SB24/34
control valve. It is equipped with the LS signal output (port Yo..). The control block
is completed by the end valve version of the SB24/34 control valve with LS signaling
direction from right to left (EVL).
The intermediate plate does not have any hydraulic functions and serves as spacer.
The control block is completed by the end plate which can also have other functions.
The flange surface is never fitted with O-rings in the flange surface (flange surface
O-ring opposite side).
The SB24/34 control block segments illustrated below are described by means
ofdummies. For a precise overview of all available combinations, refer to the
respective datasheet.
For the precise position and designation of external ports, refer to the datasheet
or the offer drawing.
Control block
Connecting plate
Central connecting plate
Control valve EHR24
Control valve SB24/34
Intermediate plate
End plate

20/78 About these products
Bosch Rexroth AG, Control block SB24/34, RE 66170-B/2019-05-15
5.3.2 Types of actuation
For mechanical actuation, the control spool is deflected mechanically.
The following types of actuation are possible:
• Rope pull
• Rod system
• Bearing block with operating lever
CAUTION! The geometry of rope pulls and rod systems is changed by elongation
and temperature. This must be taken into consideration in the design to prevent
undesired mechanical deflection of the control spool.
In case of hydraulic actuation, the pressure at a hydraulic control port is adjusted for
control of a pre-set function.
By means of the PWM pilot signal, proportional solenoids are controlled. The
controlvalve spool is proportionally actuated by these solenoids by means of
respective hitch deflection.
The CAN bus pilot signal is generated in a control unit according to a fixed protocol.
By means of the directional valve on-board electronics, the CAN bus pilot signal is
converted in a spool deflection at the directional valve.
5.3.3 Definition of control block segment sides
Independent from the LS direction, the flange surface O-ring side always receives
theside designation .
Depending on the arrangement of the tie rod bores and the flange surface O-ring
side , the block segment sides are designated from ….
Left-side version (standard) Right-side version
2
3
4
5
1
6
6
6
B
A
AP
EP
Yo2
3
1
2
2
2
4
5
6
B
A
AP
EP
Yo2
Side : Consumer port side
Side : Flange surface O-ring opposite side or connecting plate outer side
Side : Lower side
Side : Front face side A (EHS side)
Side : Front face side B
Side : Flange surface O-ring side or end plate outer side
Mechanical actuation
Hydraulic actuation
PWM pilot signal
CAN bus control: