Bosch rexroth 1 Series User manual

Instruction manual
RE 93100-01-B/2019-09-10
Replaces: –.–
English
Axial piston variable
double pump
A20V(L)O
Series 1

© 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.

Contents 3/68
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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 8
1.3.4 Abbreviations 8
2 Safety instructions 9
2.1 About this chapter 9
2.2 Intended use 9
2.3 Improper use 9
2.4 Personnel qualifications 10
2.5 General safety instructions 11
2.6 Product-specific safety instructions 12
2.7 Personal protective equipment 15
3 General instructions onproperty damage and product damage 16
4 Scope ofdelivery 19
5 About this product 20
5.1 Performance description 20
5.2 Product description 20
5.2.1 Axial piston unit layout 20
5.2.2 Functional description 21
5.3 Product identification 22
6 Transport and storage 23
6.1 Transporting theaxial piston unit 23
6.1.1 Transport byhand 23
6.1.2 Transport with lifting devices 24
6.2 Storing theaxial piston unit 26
7 Installation 28
7.1 Unpacking 28
7.2 Installation conditions 28
7.3 Installation position 29
7.3.1 Below-reservoir installation (standard) 30
7.3.2 Inside-reservoir installation 32
7.3.3 Above-reservoir installation 34
7.4 Installing theaxial piston unit 36
Contents
7.4.1 Preparation 36
7.4.2 Dimensions 37
7.4.3 General instructions 37
7.4.4 Installation with acoupling 38
7.4.5 Installation on a gearbox 39

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7.4.6 Installation with cardan shaft 39
7.4.7 Completion of assembly 40
7.4.8 Hydraulically connecting theaxial piston unit 41
7.4.9 Electrically connecting theaxial piston unit 46
7.5 Performing flushing cycle 48
8 Commissioning 49
8.1 Initial commissioning 49
8.1.1 Filling theaxial piston unit 49
8.1.2 Testing thehydraulic fluid supply 51
8.1.3 Performing afunctional test 51
8.2 Running-in phase 52
8.3 Recommissioning after standstill 52
9 Operation 53
10 Maintenance and repair 54
10.1 Cleaning and care 54
10.2 Inspection 54
10.3 Maintenance 55
10.4 Repair 56
10.5 Spare parts 56
11 Removal and replacement 57
11.1 Required tools 57
11.2 Preparing for removal 57
11.3 Performing thedisassembly 57
11.4 Preparing thecomponents for storage orfurther use 57
12 Disposal 58
13 Extension and conversion 59
14 Troubleshooting 60
14.1 How toproceed for troubleshooting 60
14.2 Malfunction table 61
15 Technical data 65
16 Alphabetical index 66
Contents

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1 About this documentation
1.1 Validity ofthedocumentation
This documentation is valid for the following product:
• Axial piston variable double pump A20V(L)O (series 1)
The axial piston variable double pump consists of tried and tested components of
the following variable pumps:
• Axial piston variable pump A10VO (series 52, size 60)
• Axial piston variable pump A11VO (series 10, size 95)
• Axial piston variable pump A11VLO (series 11, sizes 190 and 260)
• Axial piston variable pump A4VSO (series 30, size 520)
This documentation isintended for machine/system manufacturers, assemblers and
service engineers.
This documentationcontains important information onthe safe and proper
transport, installation, commissioning, operation, maintenance, removal and simple
troubleshooting oftheaxial piston unit.
▶ Read this documentation completely, inparticular chapter 2 "Safety instructions"
onpage 9 and chapter 3 "General instructions onproperty damage and
product damage" onpage 16 before you start work with theaxial piston unit.
1.2 Required and supplementary documentation
▶ Only commission theaxial piston unit 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
Order confirmation
Contains the order-related technical data for your axial piston variable
doublepump A20V(L)O.
– Order confirmation
Installation drawing
Contains the outer dimensions, all connections and the hydraulic circuit diagram
for your A20V(L)O axial piston variable double pump.
Please request
theinstallation
drawing from
your contact
atBoschRexroth.
Installation drawing
Axial piston variable double pump A20VO
Contains the permissible technical data, ports, main dimensions and
circuitdiagrams.
93100
Axial Piston variable Pump A10VO
Contains additional technical data for size 60.
92703
Axial piston variable pump A11VO
Contains additional technical data for sizes 95 to 260.
92500
Axial piston variable pump A4VSO
Contains additional technical data for size 500 (size 520 not included in the
standard program).
92050
Control systems HM, HS, HS5 and EO
Contains all control systems for size 520.
92076
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

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Table 1: Required and supplementary documentation
Title Document number Document type
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
Fire-resistant, water-free hydraulic fluids (HFDR/HFDU)
Describes therequirements onfire-resistant, water-free hydraulic fluids
(HFDR/HFDU) for operation with Rexroth hydraulic components and assists you
inselecting ahydraulic fluid for your hydraulic system.
90222
Fire-resistant, water-containing hydraulic fluids
(HFAE, HFAS, HFB, HFC)
Describes the requirements on fire-resistant, water-containing hydraulic fluids
(HFAE, HFAS, HFB, HFC) for operation with Rexroth hydraulic components and
assists you in selecting a hydraulic fluid for your hydraulic system.
90223
BoschRexroth Fluid Rating List for Rexroth hydraulic components
(pumpsandmotors)
Contains thehydraulic fluids positively evaluated byBoschRexroth.
90245
Information onthe use ofhydrostatic drives atlow temperatures
Contains additional information onthe use ofRexroth axial piston units atlow
temperatures.
90300-03-B Manual
Storage and preservation ofaxial piston units
Contains additional information onstorage and preservation.
90312
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 Safety instructions
This documentation contains safety instructions inchapter 2.6 "Product-specific
safety instructions" onpage 12 and inchapter 3 "General instructions onproperty
damage and product damage" onpage 16, aswell asbefore asequence ofactions
oraninstruction for action involving arisk ofpersonal injury andproperty damage.
Always follow themeasures for danger prevention associated with theuse ofthis
product.

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Safety instructions are set out asfollows:
SIGNAL WORD
Type and source ofdanger!
Consequences ofnoncompliance
▶ Danger prevention measures
•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
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 notices that are not safety-relevant but increase
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.

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1.3.3 Designations
This documentation uses thefollowing designations:
Table 4: Designations
Designation Meaning
A20V(L)O Axial piston variable double pump, open circuit, for mobile and stationary
applications
A10VO Axial piston variable pump, open circuit, for mobile applications
A11VO Axial piston variable pump, without charge pump, open circuit, for mobile
applications
A11VLO Axial piston variable pump, with charge pump, open circuit, for mobile
applications
A4VSO Axial piston variable pump, open circuit, for mobile or stationary
applications
Threaded plug Metal screw, pressure-resistant
Protective plug Made out ofplastic, not pressure-resistant, only for transportation
As umbrella term for "axial piston variable double pump A20V(L)O", thedesignation
"axial piston unit" will beused inthe following.
1.3.4 Abbreviations
This documentation uses thefollowing abbreviations:
Table 5: Abbreviations
Abbreviation Meaning
ATEX EC directive onexplosion protection (Atmosphère explosible)
DIN Deutsches Institut für Normung (German Institute for Standardization)
ISO International Organization for Standardization
JIS Japan Industrial Standard
RE Rexroth document inthe English language
VDI2230 Directive for thesystematic calculation ofhigh duty screwed joints and
cylindrical screw joints from theVDI (VereinDeutscherIngenieure -
Association ofGerman Engineers)

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2 Safety instructions
2.1 About this chapter
The axial piston unit has been manufactured to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axialpiston unit.
▶ Keep this documentationinalocation where itisaccessible toall users
atalltimes.
▶ Always include therequired documentation when you pass theaxial piston unit
onto third parties.
2.2 Intended use
Axial piston units 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 should only becommissioned after ithas been
installed inthe machine/system for which itisintended and thesafety oftheentire
system has been established inaccordance with theMachinery Directive.
This product isintended for thefollowing use:
The axial piston unit isonly approved asapump for hydrostatic drives inanopen
circuit. For combined operation as pump and motor, please contact us.
▶ Adhere to the technical data, the application and operating conditions, and
the performance limits as specified in 93100 and in the order confirmation.
Information on approved hydraulic fluids can be found in 92703 (size 60),92500
(sizes 95, 190 and 260) and 92050 (size 520).
The axial piston unit isonly intended for commercial use and not for private use.
Intended use includes having fully read and understood this documentation,
especially chapter 2 "Safety instructions" onpage 9.
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 andinthe order
confirmation (unless specifically approved bythecustomer)
• Use ofnon-approved fluids, e.g. water orpolyurethane components
• Changes tofactory settings byunauthorized persons.
• Use ofassembled parts (e.g. control unit, valves) not incombination with
thespecified Rexroth components

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• Use oftheaxial piston unit with assembled parts under water atadepth ofmore
than 10meters without thenecessary additional measures, e.g. pressure
equalization. Units with electrical components (e.g. sensors) generally cannot
come into contact with water. Axial piston units may only beused onacase-to-case
basis forthis application.
• Size 60: The maximum permissible case pressure specified in data sheet 92703
must not beexceeded.
• Sizes 95 to260: Use oftheaxial piston unit under acontinuous pressure
differential between housing and ambient pressure greater than 2bar, with
theambient pressure always lower than thecase pressure. Momentary (t<0.1s)
pressure peaks of up to 10bar are allowed, but no more than 1000 pressure peaks
over the entire service life. Beyond this, themaximum permissible case pressure
specified indata sheet 92500 must not beexceeded.
• Size 520: Use oftheaxial piston unit under acontinuous pressure differential
between housing and ambient pressure greater than 2bar (at nominal speed), with
theambient pressure always lower than thecase pressure. Momentary (t<0.1s)
pressure peaks ofup to6bar are allowed. Beyond this, themaximum permissible
case pressure specified indata sheet 92050 must not beexceeded.
• Use oftheaxial piston unit inpotentially explosive areas unless
thecomponent ormachine/system has been certified ascompliant with
theATEXDirective2014/34/EU
• Use oftheaxial piston unit inacorrosive atmosphere
• Use oftheaxial piston unit inaircraft orspacecraft
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 devices and lifting accessories isrequired. Inorder toensure safe
use, these activities should only beperformed byskilled personnel oraninstructed
person under thedirection and supervision ofskilled personnel.
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,
• inparticular, fully understanding therelationships with regard tosafety devices
• comprising ofknowledge regarding thefunction and layout
ofhydrauliccomponents.
BoschRexroth offers you measures supporting training inspecific areas.
Youcanfind anoverview ofthetraining contents onthe Internet at:
www.boschrexroth.com/training.

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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.
• Use Rexroth products only when they are ingood working order.
• Observe all notices onthe product.
• Do not install, operate, remove ormaintain Rexroth products ifunder theinfluence
ofalcohol, drugs ormedication that may affect your reaction time.
• Only use genuine Rexroth accessories and spare parts toensure there isno hazard
topersons 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explosion protection areas
or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/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 (e.g. when removing protective
covers, disassembly).
• There isarisk ofentanglement when operating theaxial piston unit with abare
shaft end. Check whether ornot your machine requires additional safety measures
for your application. Ifnecessary, make sure these are appropriately implemented.
• Depending onthe type ofcontrol used, electromagnetic effects can beproduced
when using solenoids. Applying adirect voltage signal (DC) tosolenoids does not
create electromagnetic interference (EMI) nor isthe solenoid affected byEMI.
Potential electromagnetic interference (EMI) exists ifthesolenoid isenergized with
amodulated direct current (e.g. PWMsignal). Appropriate testing and measures
should betaken bythe machine manufacturer toensure other components
oroperators (e.g. with pacemaker) are not affected bythis potential.

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2.6 Product-specific safety instructions
The following safety instructions apply tochapters 6 to14.
WARNING
Danger from excessive pressure!
Danger tolife, risk ofinjury orproperty damage!
Improperly changing thefactory pressure settings can result inapressure increase
beyond themaximum permissible pressure.
Operating theunit above themaximum permissible pressure can cause
components toburst and hydraulic fluid toescape under high pressure.
▶ Changes tothe factory settings may only bemade byBoschRexroth specialists.
▶ Inaddition, apressure relief valve isrequired inthe hydraulic system asback-up.
If theaxial piston unit isequipped with apressure cut-off and/or pressure
controller, this isnot anadequate safeguard against pressure overload.
Danger due tosuspended loads!
Danger tolife, risk ofinjury orproperty damage!
Improper transportation may cause theaxial piston unit tofall down and lead
toinjury, e.g. crushing orfracture, ordamage tothe product.
▶ Make sure that theload bearing capacity ofthelifting device issufficient
tosafely bear theweight oftheaxial piston unit.
▶ 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 devices for transport.
▶ Observe theprescribed position ofthelifting strap.
▶ Observe thenational laws and specifications ofoccupational safety and health
and transport.
System/machine under pressure!
Risk ofdeath orserious injury when working onunsecured machines/systems!
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 even after
separation from theactual pressure supply.
▶ Do not disconnect any line connections, ports andcomponents aslong
asthehydraulic system isunder pressure.

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WARNING
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.
▶ Only perform welding work when themachine/system isdepressurized.
▶ Keep open flames and ignition sources away from theaxial piston unit.
▶ If axial piston units 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!
Risk ofinjury from electric shock orrisk of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.
Danger from unexpected machine movement!
Danger tolife orrisk ofinjury! Unintentional orcareless actuation ofthemanual
override ofthesolenoids can cause unexpected machine movements.
▶ Use themanual override only for functional testing orinthe event oftechnical
malfunctions.
▶ Using themanual override ona permanent basis (e.g. bywedging, blocking)
isnot permitted.
▶ The use ofthemanual override isonly permitted with limited technical data
(e.g. 0.25×maximum data).
▶ Check whether ornot your machine requires additional safety measures for your
application toavoid unintentional actuation. Ifnecessary, make sure these are
appropriately implemented.
▶ Wear suitable protective clothing.
Limitation oftheclosed loop control and/or open loop control function!
Risk ofinjury orproperty damage!
Under certain circumstances, moving parts incontrol equipment
(e.g.,valvespools) 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 hydraulic fluid flow and the build-up oftorque inthe axial piston
unit can nolonger respond correctly tothe operator’s specifications. Even theuse
ofvarious filter elements (external orinternal flow filtration) will not rule out afault
but merely reduce therisk.
▶ Check whether your application requires remedial measures onyour machine
inorder tobring thedriven consumer toasafe position (e.g. safe stop).
▶ Ifnecessary, make sure these are appropriately implemented.

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CAUTION
High noise development during operation!
Danger ofhearing damage, hearing loss!
The noise emission ofaxial piston units depends onrotational speed, working
pressure and installation conditions, among other factors. The sound pressure level
may rise above 70 dB (A) incertain application conditions.
▶ Always wear hearing protection near arunning axial piston unit.
Hot surfaces onaxial piston unit!
Risk ofburning!
▶ Allow theaxial piston unit tocool down sufficiently before touching it.
▶ Protect yourself with heat-resistant protective clothing, e.g. gloves.
Inappropriate routing ofcables and lines!
Risk ofstumbling and property damage! Improper routing ofcables and lines
can cause arisk ofstumbling aswell asdamage toequipment and components,
e.g.due tolines and connectors being torn off.
▶ Always install cables and lines inaway that nobody can fall over them, that
they are not bend ortwisted, do not chafe onedges and are not guided through
ducts with sharp edges without sufficient protection.
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.
Escaping hydraulic fluid through leaking machine/system components!
Risk ofburning and risk ofinjury due toescaping hydraulic fluid jet!
▶ 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.
Danger from improper handling!
Slip hazard! Risk ofslipping onwet surfaces when climbing onthe axial piston unit.
▶ Never grab orclimb onto theaxial piston unit.
▶ Check how tosafely get ontop ofthemachine/system.

Safety instructions 15/68
RE 93100-01-B/2019-09-10, A20V(L)O Series 1, Bosch Rexroth AG
2.7 Personal protective equipment
Personal protective equipment istheresponsibility oftheuser oftheaxial piston
unit. Observe thesafety regulations inyour country.
All pieces ofpersonal protective equipment should beintact.

16/68 General instructions onproperty damage and product damage
Bosch Rexroth AG, A20V(L)O Series 1, RE 93100-01-B/2019-09-10
3 General instructions onproperty
damage and product damage
The following notices apply tochapters 6 to14.
NOTICE
Danger from improper handling!
Product can bedamaged!
▶ Do not subject theproduct toimproper mechanical loads.
▶ Never use theproduct ashandle orstep.
▶ Do not put/place any objects onthe product.
▶ Do not strike thedrive shaft oftheaxial piston unit.
▶ Do not set/place theaxial piston unit onthe drive shaft orassembled parts.
▶ Do not strike assembled parts (e.g. sensors orvalves).
▶ Do not hit sealing surfaces (e.g. onthe work connections).
▶ Leave theprotective covers onthe axial piston unit until you connect thelines.
▶ Disconnect all electrical connectors before arc welding andpainting operations.
▶ 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!
▶ Never operate theaxial piston unit with insufficient hydraulic fluid. Specifically,
make sure that therotary group has sufficient lubrication.
▶ When commissioning amachine/system, make sure that thehousing area and
theworking lines oftheaxial piston unit are filled with hydraulic fluid and
remain filled during operation.
▶ Check thehydraulic fluid level inthe housing area regularly and recommission,
ifnecessary. For above-reservoir installation, thehousing area may drain
out through thedrain line after prolonged standstill periods (air enters
through theshaft seal) orthrough theworking line (gap leakage). This means
thebearings are insufficiently lubricated when thesystem isturned on.
▶ Make sure thesuction line isalways filled with hydraulic fluid during
commissioning and operation.
▶ With above-reservoir installation, anaxial piston unit must bemoved tofull
swivel angle after nomore than three seconds during commissioning and
recommissioning. Make sure that theaxial piston unit really does suck
inhydraulic fluid and build up pressure.

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RE 93100-01-B/2019-09-10, A20V(L)O Series 1, Bosch Rexroth AG
NOTICE
Mixing hydraulic fluids!
Product can bedamaged!
▶ Before installation, remove all fluids from theaxial piston unit toprevent mixing
with thehydraulic fluid used inthe machine/system.
▶ Any mixture ofhydraulic fluids ofdifferent manufacturers and/or different types
ofthesame manufacturer isgenerally not permissible.
Contamination ofhydraulic fluid!
The cleanliness ofthe hydraulic fluid impacts the service life ofthe axial piston
unit. Contamination ofthe hydraulic fluid may lead topremature wear and
malfunctions!
▶ Always ensure awork environment inthe assembly location that isfree from
dust and foreign particles toprevent foreign particles, e.g. welding beads
ormetal cuttings, from entering thehydraulic lines and lead towear and
malfunctions inthe product. The axial piston unit should beclean when
installed.
▶ Only use clean ports, hydraulic lines and assembled parts (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.
▶ Filter the hydraulic fluid when filling the system with asuitable filter system
tominimize the solid particle contamination and water inthe hydraulic system
and to achieve the required cleanliness level.
Improper cleaning
Product can bedamaged!
▶ Plug all openings with appropriate protective covers inorder toprevent cleaning
agents from entering thehydraulic system.
▶ Never use solvents oraggressive cleaning agents. Use only water and,
ifnecessary, amild cleaning agent toclean theaxial piston unit.
▶ Do not point ahigh-pressure cleaner atsensitive components, e.g. shaft seal,
electrical connections and components.
▶ Use fiber-free cleaning cloths for cleaning.
Environmental pollution due toincorrect disposal!
Careless disposal oftheaxial piston unit and its assembled parts,
thehydraulicfluid and thepackaging material can cause environmental pollution!
▶ Dispose oftheaxial piston unit, hydraulic fluid and packaging inaccordance
with the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axial piston unit isexposed tochemical
orcorrosive environmental conditions, such assea water, fertilizer orroad salt,
itcan result incorrosion or, inextreme cases, malfunction. Leaks may lead
toaleakage ofhydraulic fluid.
▶ Take appropriate measures toprotect theaxial piston unit from chemical
orcorrosive environmental conditions.
Leakage orspilling ofhydraulic fluid!
Environmental pollution and contamination oftheground water!
▶ Always place adrip tray under theaxial piston unit when adding and draining
thehydraulic fluid.
▶ Use asuitable binding agent ifhydraulic fluid isspilled.
▶ Observe thesafety data sheet for thehydraulic fluid and thespecifications
provided bythe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axial piston unit, check thesafety distances tonearby
products toensure that they are not damaged.
The warranty exclusively applies tothe delivered configuration.
The warranty will bevoided iftheproduct isincorrectly installed, commissioned
oroperated, orif itisused orhandled improperly.

Scope ofdelivery 19/68
RE 93100-01-B/2019-09-10, A20V(L)O Series 1, Bosch Rexroth AG
4 Scope ofdelivery
1 12
3
Fig. 1: Axial piston unit (example A20VLO, size 260)
Included inthe scope ofdelivery:
• Axial piston unit asper order confirmation
The following parts come assembled onthe unit:
• Protective covers (1)
• Protective plug/threaded plugs(2)
• for version with through drive, protective cover incl. mounting bolts(3)

20/68 About this product
Bosch Rexroth AG, A20V(L)O Series 1, RE 93100-01-B/2019-09-10
5 About this product
5.1 Performance description
The axial piston variable double pump generates, controls and regulates
ahydraulicfluid flow. It is designed for mobile and stationary applications.
Refer todata sheet 93100 and theorder confirmation for thetechnical data,
operating conditions and operating limits oftheaxial piston unit.
5.2 Product description
The A20V(L)O is a variable double pump with two axial piston rotary groups in
swashplate design for hydrostatic drives in open circuits. Flow isproportional
todrive speed and displacement. The flow can be continuously adjusted by
controlling the swashplates (cradles)(16) For axial piston units with swashplate
design, the pistons(12) are arranged axially tothe drive shaft(1).
In anopen circuit, thehydraulic fluid flows from thereservoir tothe hydraulic pump
from where itisfed tothe consumer, e.g. hydraulic motor.
From theconsumer, thehydraulic fluid flows directly back tothe reservoir.
5.2.1 Axial piston unit layout
1
2
35 7 8 8 7 5 3
2
101113
14
16 16
14
1012 1311 12
Fig. 2: Layout of A20VLO, size 260
Open circuit