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)

Safety instructions 7/24
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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

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4.6 Configuring the control block
1. Determine the desired order ofthe block segments (see chapter4.2),
e.g.starting with the connecting plate.
2. Determine the tie rod length (see chapter4.3).
3. Consider the control block segments with pilot oil line Xand Rx inthe order
(seechapter4.5).
4. Determine the tie rod nut (see chapter4.4) depending onthe version ofthe final
control block segment (end plate orend valve).
4.7 Alignment ofthe control block onthe working surface
The control block segments can beassembled / disassembled horizontally
orvertically.
▲Vertical assembly ▲Horizontal assembly
In case ofhorizontal assembly, the height difference ofthe individual block segments
should becompensated with asuitable underlayer from the fifth control block
segment inorder toensure safe orientation ofthe control block segments toeach
other.
▲Compensating height differences

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BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
5 Assembly description
The assembly / disassembly isdescribed using two dummy control blocks with
5block segments each asexample.
Table 5: Control block segments
Position Designation Abbreviation
Connecting plate AP
Directional valve EHR SVL
, Directional valve SB SVL
End plate EP
End valve EVL
▲Example with end plate ▲Example with end valve
5.1 Control block assembly
5.1.1 Preparation ofthe block segments for the assembly
Prepare the flange surface O-ring side ofthe block segments asfollows:
1. Block segments with shuttle valve:
Assemble the shuttle valve according tochapter6.2 "Repairing the shuttle valve".
2. Block segments with shuttle valve with spring pre-tension:
Assemble the shuttle valve according tochapter6.3 "Repairing the spring
pre-tensioned shuttle valve".
3. Assemble the sealing elements according tochapter6.1 "Sealing elements for
control block segments".

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5.1.2 Assembly, connecting plate
1. Manually screw-in the three tie rod screws ... with the thread side into the
tie rod thread bores ... ofthe connecting plate inaclockwise direction
and tighten them. Tightening torqueMA= 45+5Nm.
5.1.3 Assembly, directional valve section
▶ Orientate the control block segment with the flange surface ofthe opposite
O-ring side tothe connecting plate and slide itvia the tie rod screws ...
tothe stop atthe connecting plate .

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5.1.4 Assembly, directional valve section and
▶ Orientate the control block segments , with the flange surface ofthe
opposite O-ring side tothe already mounted control block segment and slide
onone after the other via the tie rod screws ... tothe stop.
5.1.5 Assembly, end plate / end valve
1. Orientate the end plate / end valve with the flange surface ofthe opposite
O-ring side tothe already mounted control block segment and slide onvia the tie
rod screws ... tothe stop.
2. Screw the nuts and/or onto the tie rods ... without using any washers
orlocking washers.

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3. Align the control block segments toeach other and pre-tension the nuts
and/or inthe order with atorque ofapprox. 5+1Nm.
4. Tighten the nuts and/or inthe order . Tightening
torqueMA= 45+5Nm.

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5.2 Control block disassembly
5.2.1 Preparation ofthe disassembly
▶ Dismount the control block according tothe parameters provided bythe machine
manufacturer and place itonaclean and stable underlayer.
▶ The sealing and flange surfaces must not bedamaged.
▶ The control block segments are tobe numbered individually.
5.2.2 Disassembly, end plate / end valve
1. Loosen the nuts and/or byturning them counterclockwise and remove them
from the tie rods … .
2. Remove the end plate / end valve via the tie rods … without jamming.
5.2.3 Disassembly, directional valve section , and
▶ Remove the control block segments ,, one after another via the tie
rods … .

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5.2.4 Disassembly, connecting plate
▶ Loosen the three tie rods …byturning them counter-clockwise and unscrew
them from the connecting plate .

18/24 Repairing the flange surface
BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
6 Repairing the flange surface
6.1 Sealing elements for control block segments
Table 6: Sealing elements
Position Designation Use Dimension Number
O-ring Reservoir, return flow R27 × 2.5 1
O-ring Inlet P22 × 2.5 1
O-ring LS signal Y18 × 2.5 1
O-ring Pilot oil return/supply Rx, X 9 × 2.5 2
O-ring Return flow secondary
pressure relief valve RfB 14 × 2.5 1
Table 7: O-ring thickness – Flange surface protrusion
O-ring Ød Protrusion X
1.5mm 0.3 to0.4mm
2mm 0.4 to0.5mm
2.5mm 0.5 to0.7mm
3mm 0.6 to0.9mm
1. Remove the O-rings from the ports P, R, Y, Rx, X and RfB.
2. Insert new O-rings into the ports P, R, Y, Rx, X and RfB inthe flange surface,
seeTable 6.
Table 8: Disassembly/assembly sealing elements
Flange surface Disassembly Assembly
Control block segments with arecess for anO-ring for Rx and X(without
continuous bore through the valve housing) must also beequipped with O-rings.
Flange surfaces
O-ring protrusion
Disassembly/assembly
sealing elements

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6.2 Repairing the shuttle valve
Table 9: Parts list
Position Designation
Shuttle valve
O-ring
1. Remove the O-ring from port Y.
2. Remove the shuttle valve from port Y.
3. Align the shuttle valve with the spherical sealing cup toport Yand insert
without jamming.
4. Check the distance dimension 0.5mm from the flange surface ofthe control
block segment tothe upper edge ofthe inserted shuttle valve.
5. Insert anew O-ring into port Y.
NOTICE! The shuttle valve must remain freely moveable within the O-ring .
Disassembly/assembly
shuttle valve

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BoschRexrothAG, control block SB24/34, RE 66170-10-R/2019-05-15
6.3 Repairing the spring pre-tensioned shuttle valve
Table 10: Parts list
Position Designation
Shuttle valve
O-ring
Conical compression spring
(conicalspring)
1. Remove the O-ring from port Y.
2. Remove the shuttle valve from port Ytogether with the compression spring .
3. Align the compression spring with the end side with the larger diameter
concentrically tothe shuttle valve bore and insert it.
4. Push the compression spring inthe shuttle valve bore down tothe bore ground
while simultaneously turning itcounter-clockwise.
Die compression spring isheld atthe bore ground byits form and tension.
Disassembly/assembly
spring pre-tensioned
shuttle valve