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

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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RE 66170-10-R/2019-05-15, control block SB24/34, BoschRexrothAG

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.

About this documentation 5/24

RE 66170-10-R/2019-05-15, control block SB24/34, BoschRexrothAG

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

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

RE 66170-10-R/2019-05-15, control block SB24/34, BoschRexrothAG

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

About these products 9/24

RE 66170-10-R/2019-05-15, control block SB24/34, BoschRexrothAG

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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