Bosch rexroth SB24 Manuale utente
Assembly Instructions
RE 66170-10-R/2019-05-15 English
Load-sensing control block
insandwich plate design
SB24/34
Control block assembly – Control blocks with connecting plate
©BoschRexrothAG2019. 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
ofown judgment and verification. It must
beremembered that our products are subject
to a natural process of wear and aging.
The cover shows anexample application. The
product delivered may differ from the image
onthe cover.
The original repair manual was created inthe
German language.
3/24
RE 66170-10-R/2019-05-15, control block SB24/34, BoschRexrothAG
Contents
1 About this documentation 4
1.1 Validity ofthe documentation 4
1.2 Required and supplementary documentation 4
1.3 Representation ofinformation 5
1.3.1 Symbols 5
1.3.2 Designations 5
1.3.3 Abbreviations 6
2 Safety instructions 7
3 General instructions onproperty damage and product damage 7
4 About these products 8
4.1 Overview ofcontrol 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 ofthe control block onthe working surface 11
5 Assembly description 12
5.1 Control block assembly 12
5.1.1 Preparation ofthe 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 ofthe 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
BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
1 About this documentation
1.1 Validity ofthe documentation
This documentation applies forload-sensing control blocksSB24/34
ofBoschRexroth including the following control block segments:
• Connecting plate, end plate
• Control valvesSB24-M, SB24-EHS and SB34-EHS
• Hitch control valvesEHR24-EHS and EHR24-EM2
▶ Read this documentation completely and, inparticular, the chapter2
"Safetyinstructions" and the chapter3 "General instructions onproperty and
product damage" inthe related instructionmanual66170-B before you start
working with the product.
1.2 Required and supplementary documentation
▶ Only commission the product ifthe documentation marked with the book symbol
isavailable toyou and you have understood and observed it.
Table 1: Required and supplementary documentation
Title Document number Document type
Load-sensing control blockSB24/34
Contains important information onthe safe and proper transport, installation,
commissioning, maintenance and disassembly ofthe SB24/34 control block.
66170-B Instruction manual
Technical datasheet
Contains the permissible technical data.
Please bear inmind that different technical datasheets apply depending
ontheversion:
Data sheet
Load-sensing control blockSB24/34 66170
Load-sensing directional valves insandwich plate designSB24-EHS, SB34-EHS 66171
Load-sensing directional valves insandwich plate designSB24-M 66172
PlatesSB24, SB34 66173
Hitch control valvesEHR5, EHR24-EM2, EHR24-EHS 66126
For related documentation onthe assembly and repair, please refer tothe
above-mentioned manual and, ifnecessary, to
www.boschrexroth.com/mobile-hydraulics-catalog.
About this documentation 5/24
RE 66170-10-R/2019-05-15, control block SB24/34, BoschRexrothAG
1.3 Representation ofinformation
Uniform safety instructions, symbols, terms and abbreviations are used throughout
this documentation toensure safe and proper use ofthe product. For clarification,
they are explained inthe sections below.
1.3.1 Symbols
The following symbols indicate information that isnot safety-relevant but increases
understanding ofthe documentation.
Table 2: Meaning ofsymbols
Symbol Meaning
Ifthis information isdisregarded, the product cannot beused and/or
operated toits full extent.
▶ Single, independent action
1.
2.
3.
Numbered instruction:
The numbers indicate that theactions must becompleted inorder.
Black circle with white number:
Auxiliary marking forabetter understanding.
White circle with black number: Position orassembly group with
reference tothe parts list and tothe graphics within achapter.
White circle with black letters: Assembly group with reference tothe
parts list and tothe graphics within achapter.
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
forelectrohydraulic 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
BoschRexrothAG, 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 toleft)
EHR Electrohydraulic hitch control
EHS Electrohydraulic actuating unit
EVL End valve (with LS signaling direction from right toleft)
EP End plate
SVL Standard valve (with LS signaling direction from right toleft)
Safety instructions 7/24
RE 66170-10-R/2019-05-15, control block SB24/34, BoschRexrothAG
2 Safety instructions
▶ Always follow all safety instructions inthe instructionmanual66170-B.
3 General instructions onproperty
damage and product damage
▶ Always follow all instructions inthe instructionmanual66170-B.
• Rexroth original spare parts may beused only.
• Replace elastic sealing elements after disassembly.
• The housing and parts must beclean and undamaged.
• Damaged housings and parts may not beused again.
• Reworking threads isnot permissible.
• Reworking bores isnot permissible.
• Protect bores and threads from any deposition ofdirt.
• During disassembly, adhesion forces might take aneffect between the
flangesurfaces.
• Remove any contamination with awhetstone and clean it with acleaning cloth.
• Surfaces with imprints orsigns ofwear inthe sealing surface may not becontinued
tobe used.
• Reworking sealing surfaces isnot permissible.
• Use protective jaws with hard rubber. Sealing and flange surfaces may not
bedamaged.
• 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
BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
4 About these products
To ensure clear presentation ofthe control block assembly / disassembly, the
representation ofthe control block segments has been simplified and/or reduced
tothe essential and summarized indummies.
The work steps are described based onacontrol block with dummy block
segments.
4.1 Overview ofcontrol 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 bymeans oftie rods and nuts.
For this purpose, the control block isprovided with threaded bores atone control
block segment and the following control block segments are provided with through
bores inthe flange surfaces.
At the final control block segment, the tie rods protrude atthe end surface.
Onthe protrusion, the tie rod nuts are located.
Example:
Bore Bore Bore Bore Thread
Nut EP / EVL SVL SVL SVL AP
About these products 9/24
RE 66170-10-R/2019-05-15, control block SB24/34, BoschRexrothAG
4.3 Tie rod
▶ Use tie rods (stud screws) according toDIN 835 - M10×length,
propertyclass10.9.
Oneach shaft end and , the tie rod isprovided with athread for different use.
• Interference thread with 20mm length (thread undercut + thread), which
isscrewed into the AP.
• Nut thread
The required tie rod length depends onthe number and combination ofthe control
block segments.
The tie rod length Lisdetermined asfollows: L= + +
The determination process for the required tie rod length isexactly described
indatasheet66170.
NOTICE! The tie rods must not bedeformed duringassembly/disassembly ofthe
control block segments!
4.4 Nut
For the tie rod nut thread , different nuts are used, depending onthe final control
block segment (AP orCVL and/or EP orEVL).
▲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
BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
4.5 EHS pilot oil bores
For control blocks inEHS 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 tobeconsidered inthe control block segment selection.
The position ofthe control block segment with the pilot oil feed influences the order
and/or version ofthe following control block segments.
To control block segments without EHS, the following applies:
• With continuous pilot oil line Xand Rx, ifany ofthe 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, ifnone ofthe 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
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