Bosch Rexroth RE 90300-B User manual

Instruction manual
RE90300-B/2021-01-19, replaces: 06.2012, EN
General
InstructionManual for
Axial Piston Units

© BoschRexrothAG2021. 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
German.

RE90300-B/2021-01-19, Bosch Rexroth AG
Axial piston units 3/64
BG: Използването на този продукт може да се извърши едва тогава, когато разполагате с това упътване за
употреба в разбираема за Вас версия на езика и сте разбрали неговото съдържание. Ако това не етака,
обърнете се към Вашия партньор BoschRexroth или към компетентен сервиз. Ще го намерите
вwww.boschrexroth.com.
CS: Tento výrobek se smí používat jedině tehdy, máte-li k dispozici tento návod k obsluze v pro vás srozumitelné
jazykové verzi a rozumíte-li celému jeho obsahu. Pokud tomu tak není, obraťte se na svou kontaktní osobu u firmy
BoschRexroth nebo na příslušné servisní středisko. To naleznete také na internetové adrese www.boschrexroth.com.
DA: Dette produkt må ikke anvendes, før du har modtaget og læst driftsvejledningen på et for dig forståeligt sprog
og har forstået indholdet. Hvis det ikke er tilfældet, bedes du kontakte din kontaktperson hos BoschRexroth eller
den ansvarlige kundeserviceafdeling. Den kan du finde på hjemmesiden www.boschrexroth.com.
DE: Die Verwendung dieses Produkts darf erst dann erfolgen, wenn Sie diese Betriebsanleitung in einer für Sie
verständlichen Sprachversion vorliegen und den Inhalt verstanden haben. Ist dies nicht der Fall, wenden Sie sich
bitte an Ihren BoschRexroth Ansprechpartner oder die zuständige Servicestelle. Diese finden Sie auch unter
www.boschrexroth.com.
EL: Η χρήση αυτού του προϊόντος επιτρέπεται μόνο, εάν διαθέτετε τις παρούσες οδηγίες χρήσης σε κατανοητή
γλώσσα και εφόσον έχετε κατανοήσει το περιεχόμενό τους. Εάν δεν πληρούνται αυτές οι προϋποθέσεις, απευθυνθείτε
στους κατά τόπους αντιπροσώπους της BoschRexroth ή σε κάποιο εξουσιοδοτημένο σέρβις. Για τα σχετικά στοιχεία
επισκεφτείτε την ιστοσελίδα www.boschrexroth.com.
EN: This product may only be used if these operating instructions are available to you in a language version that you
can understand and if you have understood its content. If this is not the case, please contact your BoschRexroth
contact partner or the responsible service point. You can also find them under www.boschrexroth.com.
ES: Este producto únicamente podrá utilizarse cuando disponga de las instrucciones de servicio en un idioma que
entienda y haya entendido su contenido. En caso contrario, diríjase a su persona de contacto de BoschRexroth o al
servicio técnico competente, que podrá encontrar también en la dirección www.boschrexroth.com.
ET: Toodet tohib kasutada ainult siis, kui teil on olemas teie jaoks arusaadavas keeles kasutusjuhend ja te
saate selle sisust aru. Kui see nii ei ole, pöörduge oma BoschRexrothi esindaja või vastava teeninduse poole.
Nendekontaktandmed leiate aadressilt www.boschrexroth.com.
FI: Älä käytä tuotetta ennen kuin olet saanut käyttöohjeen omalla kielelläsi ja ymmärrät sen sisällön. Ota muussa
tapauksessa yhteyttä BoschRexroth -yhteyshenkilöösi tai valtuutettuun huoltoliikkeeseen. Yhteystiedot löydät
osoitteesta www.boschrexroth.com.
FR: Ce produit ne doit être utilisé que lorsque vous disposez des présentes instructions de service en une version
linguistique que vous comprenez et que vous avez compris son contenu. Si cela n‘est pas le cas, veuillez vous
adresser à votre interlocuteur BoschRexroth ou au service compétent. Vous trouvez les coordonnées également sur
le site www.boschrexroth.com.
HU: A terméket csak akkor szabad használni, ha ez a kezelési útmutató rendelkezésre áll az Ön számára érthető
egyik nyelven, és megértette annak tartalmát. Egyéb esetben forduljon a BoschRexroth kapcsolattartójához vagy az
illetékes szervizhez. Ezeket is megtalálja az alábbi címen: www.boschrexroth.com.
IT: Questo prodotto può essere impiegato solo se si dispone del presente manuale d‘uso in una lingua conosciuta
ese ne è stato compreso il contenuto. In caso contrario rivolgersi al referente BoschRexroth o al punto di assistenza
competente. Questi sono anche riportati sul sito www.boschrexroth.com.
LT: Naudoti šį produktą leidžiama tik turint šią vartotojo instrukciją Jums suprantama kalba ir jei supratote jos
turinį. Jei instrukcijos nesuprantate, prašome kreiptis į savo BoschRexroth konsultantą arba atsakingą aptarnavimo
tarnybą. Informaciją apie juos rasite adresu www.boschrexroth.com.
LV: Šo ierīci drīkst lietot tikai tad, ja šī ekspluatācijas instrukcija Jums ir pieejama kādā jums saprotamā valodā un
Jūs esat izpratis tās saturu. Pretējā gadījumā lūdzam vērsties pie attiecīgās "BoschRexroth" kontaktpersonasvai
kompetentā servisa dienestā. Nepieciešamā informācija ir pieejama arī mūsu mājas lapā internetā
www.boschrexroth.com.

Bosch Rexroth AG, RE90300-B/2021-01-19
4/64 Axial piston units
NL: U mag het product pas gebruiken, als deze bedieningshandleiding voor u beschikbaar is in een voor
ubegrijpelijke taal en als u de inhoud daarvan begrepen heeft. Is dit niet het geval, neem dan a.u.b. contact op met
uw BoschRexroth contactpersoon of de servicepartner. Deze vindt u ook op www.boschrexroth.com.
NO: Dette produktet må ikke brukes før du har mottatt denne bruksanvisningen på et språk som du forstår, og du
har forstått innholdet. Hvis dette ikke er tilfellet, ta kontakt med din kontaktperson hos BoschRexroth eller den
ansvarlige kundeserviceavdelingen. Disse finner du også på www.boschrexroth.com.
PL:
Przed przystąpieniem do eksploatacji niniejszego produktu należy zapoznać się z instrukcją obsługi w Państwa
wersji językowej. Wprzypadku, gdy nie dołączono instrukcji w danym języku, należy zwrócić się z zapytaniem do
osoby kontaktowej BoschRexroth lub do odpowiedniego punktu obsługi. Listę takich punktów można znaleźć na
stronie www.boschrexroth.com.
PT: Este produto só pode ser utilizado se o manual de instruções estiver disponível em um idioma compreensível
para você e se você tiver compreendido o conteúdo do mesmo. Se esse não for o caso, entre em contato com o seu
representante da BoschRexroth ou com a assistência técnica. Encontre-os em www.boschrexroth.com
RO: Aveţi voie să utilizaţi acest produs, doar după ce aţi primit acest manual de utilizare într-o versiune de limbă
inteligibilă pentru dumneavoastră şi aţi înţeles conţinutul său. Dacă aceste condiţii nu sunt îndeplinite, adresaţi-vă
persoanei dumneavoastră de contact de la BoschRexroth sau la service-ul BoschRexroth competent. Găsiţi aceste
service-uri la www.boschrexroth.com
RU: Использование данного продукта разрешается только после получения Вами настоящего руководства по
эксплуатации на русском языке и его внимательного изучения. Если у Вас нет руководства по эксплуатации,
обратитесь, пожалуйста, к ответственному за Ваш регион представителю BoschRexroth или в соответствующий
сервисный центр. Оно также находится на сайте www.boschrexroth.com.
SK: Tento výrobok sa smie používať až vtedy, keď ste dostali tento návod na prevádzku k dispozícii v pre vás
zrozumiteľnej jazykovej mutácii a obsahu ste porozumeli. V opačnom prípade sa, prosím, obráťte na vašu kontaktnú
osobu vBoschRexroth alebo na zodpovedné servisné miesto. Nájdete ich tiež na www.boschrexroth.com.
SL: Z uporabo tega izdelka lahko pričnete šele, ko ste prebrali ta navodila za uporabo v vam razumljivem jeziku
in razumeli njihovo vsebino. Če navodila za uporabo niso na voljo v vašem jeziku, vas prosimo, da se obrnete na
kontaktno osebo podjetja BoschRexroth oz. pooblaščeni servis. Te lahko najdete tudi na www.boschrexroth.com.
SV: Denna produkt får inte användas förrän du har mottagit en bruksanvisning på ett språk som du förstår och sedan
har läst och förstått innehållet i. Om detta inte är fallet ber vi dig kontakta din kontaktperson på BoschRexroth eller
ansvarig kundservice. Dessa hittar du också på www.boschrexroth.com.
ZH: 使用该产品前，请您确保已拥有一份您所熟悉语言版本的使用说明书并已理解其内容。 如果尚未拥有，请向博世力士乐合
作伙伴或相关服务部门索取，也可登录 www.boschrexroth.com 下载。

RE90300-B/2021-01-19, Bosch Rexroth AG
Contents | Axial piston units 5/64
1 About this documentation ........................................................................ 7
1.1 Validity of the documentation ......................................................................7
1.2 Required and supplementary documentation...............................................7
1.3 Representation of information......................................................................8
1.3.1 Safety instructions .......................................................................................8
1.3.2 Symbols .......................................................................................................9
1.3.3 Designations ................................................................................................9
1.3.4 Abbreviations .............................................................................................10
2 Safety instructions ................................................................................. 11
2.1 About this chapter......................................................................................11
2.2 Intended use ..............................................................................................11
2.3 Improper use..............................................................................................12
2.4 Personnel qualifications.............................................................................12
2.5 General safety instructions ........................................................................13
2.6 Product-specific safety instructions ...........................................................14
2.7 Personal protective equipment...................................................................18
3 General instructions on property damage and product damage.............. 19
4 Scope of delivery.................................................................................... 22
5 About this product ................................................................................. 23
5.1 Performance description............................................................................23
5.2 Product description ...................................................................................23
5.3 Product identification.................................................................................23
6 Transport and storage ............................................................................ 24
6.1 Transporting the axial piston unit...............................................................24
6.1.1 Transport by hand ......................................................................................24
6.1.2 Transport with lifting devices.....................................................................25
6.2 Storing the axial piston unit.......................................................................26
7 Installation............................................................................................. 29
7.1 Unpacking ..................................................................................................29
7.2 Installation conditions................................................................................29
7.3 Installation position ...................................................................................31
7.3.1 Below-reservoir installation (standard)......................................................31
7.3.2 Inside-reservoir installation........................................................................31
7.3.3 Above-reservoir installation........................................................................31
7.4 Installing the axial piston unit....................................................................32
7.4.1 Preparation ................................................................................................32
7.4.2 Dimensions ................................................................................................32
7.4.3 General instructions...................................................................................32
7.4.4 Installation with acoupling........................................................................33
7.4.5 Installation on agearbox............................................................................34
7.4.6 Installation with cardan shaft.....................................................................34
7.4.7 Completion of assembly.............................................................................35
7.4.8 Hydraulically connecting the axial piston unit............................................36
7.4.9 Electrically connecting the axial piston unit...............................................40
7.5 Performing flushing cycle...........................................................................41
Contents

6/64 Axial piston units | Contents
Bosch Rexroth AG, RE90300-B/2021-01-19
8 Commissioning....................................................................................... 42
8.1 Initial commissioning .................................................................................42
8.1.1 Filling the axial piston unit.........................................................................42
8.1.2 Testing the hydraulic fluid supply...............................................................44
8.1.3 Performing afunctional test.......................................................................44
8.2 Running-in phase .......................................................................................45
8.3 Recommissioning after standstill ...............................................................45
9 Operation ............................................................................................... 46
10 Maintenance and repair.......................................................................... 47
10.1 Cleaning and care ......................................................................................47
10.2 Inspection ..................................................................................................48
10.3 Maintenance...............................................................................................48
10.4 Repair ........................................................................................................49
10.5 Spare parts ................................................................................................49
11 Removal and replacement ...................................................................... 50
11.1 Required tools............................................................................................50
11.2 Preparing for removal.................................................................................50
11.3 Performing the removal..............................................................................50
11.4 Preparing the components for storage or further use.................................50
12 Disposal ................................................................................................. 51
13 Extension and conversion....................................................................... 51
14 Troubleshooting ..................................................................................... 52
14.1 How to proceed for troubleshooting...........................................................52
14.2 Axial piston pump malfunction table..........................................................53
14.3 Axial piston motor malfunction table .........................................................57
15 Technical data ........................................................................................ 59
16 Product-specific instruction manuals ..................................................... 60
17 Alphabetical index ................................................................................. 62

RE90300-B/2021-01-19, Bosch Rexroth AG
About this documentation | Axial piston units 7/64
1 About this documentation
1.1 Validity of the documentation
This documentation is valid for the following products:
Axial piston units from BoschRexroth, which include:
• Axial piston pumps
• Axial piston motors
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 units.
▶ Read this documentation completely, in particular chapter 2 "Safety instructions"
on page 11 and chapter 3 "General instructions on property damage and
product damage" on page 19 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 unit.
– Order confirmation
Installation drawing
Contains the outer dimensions, all ports and the hydraulic circuit
diagram for your axial piston unit.
Please request the installation
drawing from your contact at
BoschRexroth.
Installation drawing
Product-specific instruction manual
Contains special information for the axial piston unit concerned.
The product-specific instruction
manual can be found in the internet,
see chapter16 "Product-specific
instruction manuals" on page60.
Instruction manual
Product-specific datasheet
Contains the permissible technical data, ports, main dimensions
and circuit diagrams of standard versions.
The product-specific datasheet
can be found in the internet,
seechapter15 "Technical data"
onpage59.
Datasheet
Overall circuit diagram of the machine or system
The hydraulic and electrical circuit diagrams of the
machine/system contain the information of the hydraulic or
electrical ports. You will need these data to work with the axial
piston unit as part of the machine/system.
You will receive the documents from
your machine/system manufacturer
on request.
Circuit diagram
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 Datasheet

8/64 Axial piston units | About this documentation
Bosch Rexroth AG, RE90300-B/2021-01-19
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 Datasheet
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 Datasheet
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 Datasheet
Axial piston units for operation with fire-resistant hydraulic
fluids – water-free, water-containing
(HFDR, HFDU, HFA, HFB, HFC)
Describes the requirements on fire-resistant, water-free and
water-containing hydraulic fluids (HFDR, HFDU, HFA, HFB, HFC)
and contains the technical data for operation with Rexroth
hydraulic components.
90225 Datasheet
BoschRexroth Fluid Rating List for Rexroth hydraulic
components (pumps and motors)
Contains the hydraulic fluids positively evaluated by
BoschRexroth.
90245 Datasheet
Information on the application of hydrostatic drives at low
temperatures
Contains additional information on the application 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 Datasheet
BODAS-drive eDA application software
BODAS-drive eDA is asoftware solution integrated in the Rexroth
SRC-eDA1/31 control unit for controlling the hydrostatic drive
train in wheeled vehicles.
95316 Datasheet
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14 and in chapter3 "General instructions on property
damage and product damage" on page19, 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.

RE90300-B/2021-01-19, Bosch Rexroth AG
About this documentation | Axial piston units 9/64
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.
1.3.3 Designations
This documentation uses the following designations:
Table 4: Designations
Designation Meaning
Threaded plug Metal screw, pressure-resistant
Protective plug Made out of plastic, not pressure-resistant, only for transportation

10/64 Axial piston units | About this documentation
Bosch Rexroth AG, RE90300-B/2021-01-19
1.3.4 Abbreviations
This documentation uses the following abbreviations:
Table 5: Abbreviations
Abbreviation Meaning
ANSI American National Standards Institute is an organization that coordinates
the development of voluntary standards in the United States
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 Standard for the systematic calculation of heavy-duty threaded
connectionsand cylindrical screw joints from the VDI
(VereinDeutscherIngenieure - Association of German Engineers)

RE90300-B/2021-01-19, Bosch Rexroth AG
Safety instructions | Axial piston units 11/64
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:
Product Use
Axial piston pump in open
circuit
The axial piston unit is only approved as apump for hydrostatic
drives in an open circuit.
Axial piston pump in closed
circuit
The axial piston unit is only approved as apump for hydrostatic
drives in closed circuit.
Plastic feed pump The axial piston unit is only approved for pumping polyurethane
components (polyol and isocynate).
Axial piston motor The axial piston unit is only approved as ahydraulic motor in
hydrostatic drives.
▶ Observe the technical data, application and operating conditions and
performance limits as specified in the product-specific datasheet and in the
order confirmation. Information about approved hydraulic fluids can be found in
the product-specific datasheet.
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 11.

12/64 Axial piston units | Safety instructions
Bosch Rexroth AG, RE90300-B/2021-01-19
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):
• Using outside the operating parameters approved in the product-specific
datasheet or in the order confirmation (unless customer-specific approval has
been granted)
• Use for non-approved fluids, e.g.water or polyurethane components
(exception:plastic feed pump)
• Changes to factory settings by unauthorized persons.
• Use of assembled parts (e.g.attachment filter, control unit, valves) other than
specified Rexroth components
• 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.
• Use of the axial piston unit when ambient pressure is greater than internal pressure
(case pressure). Beyond this, the maximum permissible case pressure specified in
the product-specific datasheet should not be exceeded.
• Application of the axial piston unit in explosive environments 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
• Knowledge regarding the function and interaction 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.

RE90300-B/2021-01-19, Bosch Rexroth AG
Safety instructions | Axial piston units 13/64
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 assemble, 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). The machine manufacturer
should conduct appropriate tests and take appropriate measures to ensure that
other components or operators (e.g.with apacemaker) are not affected by this
potentiality.

14/64 Axial piston units | Safety instructions
Bosch Rexroth AG, RE90300-B/2021-01-19
2.6 Product-specific safety instructions
The following safety instructions apply to chapters 6 to 14.
WARNING
Danger from excessive pressure!
Risk of death or 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!
Risk of death or 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 regulations on occupational health and safety,
and transportation.
System/machine under pressure!
Risk of death or serious injury when working on unsecured machines/systems!
Property damage!
▶ Switch off the relevant machine/system part and secure it against reactivation
according to the parameters 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 or components as long as the
hydraulic system is under pressure.

RE90300-B/2021-01-19, Bosch Rexroth AG
Safety instructions | Axial piston units 15/64
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.
Escaping hydraulic fluid due to leakage of machine/system components!
Risk of burning and risk of injury due to escaping hydraulic fluid jet!
In case of leakage at the axial piston unit, high-pressure fluid jets may escape.
▶ 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.
Hydraulic fluid will explode when making contact with water.
Risk of explosion and fire!
▶ Do not bring hot hydraulic fluids in contact with water.
Electrical voltage!
Danger to life or risk of injury due to electric shock or property damage!
▶ Always diskonnect the voltage supply to the relevant machine/system part
before assembling the product and/or connecting or diskonnecting 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.

16/64 Axial piston units | Safety instructions
Bosch Rexroth AG, RE90300-B/2021-01-19
WARNING
Overloading of the axial piston motor!
Risk of injury or property damage!
When using the axial piston motor in winch drives it may, when extremely
overloaded (e.g., if the maximum permissible rotational speeds are exceeded
during weighing of the anchor while the ship is in motion), cause the rotary group
to be damaged and, in the worst case, the axial piston motor may burst.
▶ Ensure that the technical limit values are not exceeded in any operating
conditions.
▶ Check whether any additional measures are needed for your machine/system
(up to an encapsulation) in order to avoid any hazard to persons. If necessary,
make sure that these are properly implemented.
▶ For safety reasons, axial piston variable motors with beginning of control at Vg min
(e.g.HA) are not permissible for winch drives (e.g.anchor winches).
Restriction of 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.
Limitation of load-holding function in lifting winches!
Risk of injury or property damage!
Moving parts in high-pressure relief valves may in certain circumstances become
stuck in an undefined position due to contamination (e.g.impure hydraulic fluid).
This can result in restriction or loss of load-holding functions in lifting winches.
▶ Check whether the application on your machine requires additional safety
measures in order to keep the load in asafe position.
▶ If necessary, make sure these are appropriately implemented.

RE90300-B/2021-01-19, Bosch Rexroth AG
Safety instructions | Axial piston units 17/64
WARNING
Risk of pressurized hydraulic fluid leaking or flying components!
Danger to life or risk of injury! When selecting or using connecting elements
without sufficient high-pressure resistance, they may burst or lead to the leakage of
hydraulic fluid and/or to ejected components. The ports and fastening threads of
the axial piston unit are designed for the specified maximum pressure.
▶ Only ever connect connecting elements and lines that match the ports of
the axial piston unit and can resist the intended application conditions
(e.g.pressure level, flow, hydraulic fluid, temperature) with the necessary
safetyfactors.
CAUTION
High noise development during operation!
Risk of hearing damage or 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.
▶ Wear heat-resistant, protective clothing, e.g.gloves.
Improper cable and line routing!
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 lay cables and lines so no one can trip over them, they do not become
kinked or twisted, do not rub on edges and do not run through sharp-edged
ducts without adequate protection.
Contact with hydraulic fluid!
Risk of adverse health effects, e.g.eye injury, skin irritation, toxication from
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.

18/64 Axial piston units | Safety instructions
Bosch Rexroth AG, RE90300-B/2021-01-19
CAUTION
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.
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.

RE90300-B/2021-01-19, Bosch Rexroth AG
General instructions on property damage and product damage | Axial piston units 19/64
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. solenoids 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.
▶ Diskonnect all electrical connectors before arc welding and painting operations.
▶ Make sure the electronic components (e.g.sensors) do not build up
electrostatic charges (e.g.during painting).
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. Air intrusions in the forward drive shaft bearing are to
be prevented, especially with the installation position "drive shaft upwards"
(ifpermissible).
▶ 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 draw in
hydraulic fluid and build up pressure (for axial piston variable pumps in
opencircuits).

20/64 Axial piston units | General instructions on property damage and product damage
Bosch Rexroth AG, RE90300-B/2021-01-19
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 axial piston unit.
▶ 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 fibre-free cleaning cloths for cleaning.
Environmental pollution due to improper 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 for the hydraulic fluid.