Bosch rexroth SB24 User manual

Assembly Instructions
RE 66170-10-R/2019-05-15 English
Load-sensing control block
insandwich plate design
SB24/34
Control block assembly – Control blocks with connecting plate

©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 repair manual was created inthe
German language.

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Contents
1 About this documentation 4
1.1 Validity ofthe documentation 4
1.2 Required and supplementary documentation 4
1.3 Representation ofinformation 5
1.3.1 Symbols 5
1.3.2 Designations 5
1.3.3 Abbreviations 6
2 Safety instructions 7
3 General instructions onproperty damage and product damage 7
4 About these products 8
4.1 Overview ofcontrol block segments 8
4.2 Tie rod bores and threads 8
4.3 Tie rod 9
4.4 Nut 9
4.5 EHS pilot oil bores 10
4.6 Configuring the control block 11
4.7 Alignment ofthe control block onthe working surface 11
5 Assembly description 12
5.1 Control block assembly 12
5.1.1 Preparation ofthe block segments for the assembly 12
5.1.2 Assembly, connecting plate 13
5.1.3 Assembly, directional valve section 13
5.1.4 Assembly, directional valve section and 14
5.1.5 Assembly, end plate / end valve 14
5.2 Control block disassembly 16
5.2.1 Preparation ofthe disassembly 16
5.2.2 Disassembly, end plate / end valve 16
5.2.3 Disassembly, directional valve section , and 16
5.2.4 Disassembly, connecting plate 17
6 Repairing the flange surface 18
6.1 Sealing elements for control block segments 18
6.2 Repairing the shuttle valve 19
6.3 Repairing the spring pre-tensioned shuttle valve 20
Contents

4/24 About this documentation
BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
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, end plate
• Control valvesSB24-M, SB24-EHS and SB34-EHS
• Hitch control valvesEHR24-EHS and EHR24-EM2
▶ Read this documentation completely and, inparticular, the chapter2
"Safetyinstructions" and the chapter3 "General instructions onproperty and
product damage" inthe related instructionmanual66170-B before you start
working with the product.
1.2 Required and supplementary documentation
▶ Only commission the product ifthe documentation marked with the book symbol
isavailable toyou and you have understood and observed it.
Table 1: Required and supplementary documentation
Title Document number Document type
Load-sensing control blockSB24/34
Contains important information onthe safe and proper transport, installation,
commissioning, maintenance and disassembly ofthe SB24/34 control block.
66170-B Instruction manual
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
For related documentation onthe assembly and repair, please refer tothe
above-mentioned manual and, ifnecessary, to
www.boschrexroth.com/mobile-hydraulics-catalog.

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1.3 Representation ofinformation
Uniform 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 Symbols
The following symbols indicate information that isnot safety-relevant but increases
understanding ofthe documentation.
Table 2: 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.
1.3.2 Designations
This documentation uses the following designations:
Table 3: 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 control for electrohydraulic hitch control
Control valve Directional valve type SB
Hitch control valve Directional valve type EHR

6/24 About this documentation
BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
1.3.3 Abbreviations
This documentation uses the following abbreviations:
Table 4: Abbreviations
Abbreviation Meaning
AP Connecting plate
CVL Connection valve (with LS signaling direction from right toleft)
EHR Electrohydraulic hitch control
EHS Electrohydraulic actuating unit
EVL End valve (with LS signaling direction from right toleft)
EP End plate
SVL Standard valve (with LS signaling direction from right toleft)

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2 Safety instructions
▶ Always follow all safety instructions inthe instructionmanual66170-B.
3 General instructions onproperty
damage and product damage
▶ Always follow all instructions inthe instructionmanual66170-B.
• Rexroth original spare parts may beused only.
• Replace elastic sealing elements after disassembly.
• The housing and parts must beclean and undamaged.
• Damaged housings and parts may not beused again.
• Reworking threads isnot permissible.
• Reworking bores isnot permissible.
• Protect bores and threads from any deposition ofdirt.
• During disassembly, adhesion forces might take aneffect between the
flangesurfaces.
• Remove any contamination with awhetstone and clean it with acleaning cloth.
• Surfaces with imprints orsigns ofwear inthe sealing surface may not becontinued
tobe used.
• Reworking sealing surfaces isnot permissible.
• Use protective jaws with hard rubber. Sealing and flange surfaces may not
bedamaged.
• Oil-soaked cleaning cloth
• Whetstone
• Mechanical tools
• Torque wrench
Housing and parts
Flange surfaces and
sealing surfaces
Bench vise
Required tools

8/24 About these products
BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
4 About these products
To ensure clear presentation ofthe control block assembly / disassembly, the
representation ofthe control block segments has been simplified and/or reduced
tothe essential and summarized indummies.
The work steps are described based onacontrol block with dummy block
segments.
4.1 Overview ofcontrol block segments
Plates
▲End plate (EP) ▲Connecting plate (AP)
Directional valves
▲End valve (EVL) ▲Standard directional valve (SVL) ▲Hitch control valve EHR24-EM2
4.2 Tie rod bores and threads
The control block segments are clamped together bymeans oftie rods and nuts.
For this purpose, the control block isprovided with threaded bores atone control
block segment and the following control block segments are provided with through
bores inthe flange surfaces.
At the final control block segment, the tie rods protrude atthe end surface.
Onthe protrusion, the tie rod nuts are located.
Example:
Bore Bore Bore Bore Thread
Nut EP / EVL SVL SVL SVL AP

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4.3 Tie rod
▶ Use tie rods (stud screws) according toDIN 835 - M10×length,
propertyclass10.9.
Oneach shaft end and , the tie rod isprovided with athread for different use.
• Interference thread with 20mm length (thread undercut + thread), which
isscrewed into the AP.
• Nut thread
The required tie rod length depends onthe number and combination ofthe control
block segments.
The tie rod length Lisdetermined asfollows: L= + +
The determination process for the required tie rod length isexactly described
indatasheet66170.
NOTICE! The tie rods must not bedeformed duringassembly/disassembly ofthe
control block segments!
4.4 Nut
For the tie rod nut thread , different nuts are used, depending onthe final control
block segment (AP orCVL and/or EP orEVL).
▲DIN 970–M10 for connecting (AP) and end
plate (EP)
▲Shoulder nut M10 for connection valve
(CVL) and end valve (EVL)

10/24 About these products
BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
4.5 EHS pilot oil bores
For control blocks inEHS version, control block segments with pilot oil line Xand Rx
are required.
With mixed control blocks (control block segments with and without EHS), the pilot
oil line Xand Rx has tobeconsidered inthe control block segment selection.
The position ofthe control block segment with the pilot oil feed influences the order
and/or version ofthe following control block segments.
To control block segments without EHS, the following applies:
• With continuous pilot oil line Xand Rx, ifany ofthe following control block
segments requires the pilot oil line Xand Rx.
▲O-ring side:
X and Rx with O-ring counterbores and
O-rings
▲Opposite O-ring side:
X and Rx with through bore
• Without continuous pilot oil line Xand Rx, ifnone ofthe following control block
segment requires the pilot oil line Xand Rx.
▲O-ring side:
X and Rx with O-ring counterbores and
O-rings
▲Opposite O-ring side:
closed