Bosch rexroth 60 Series User manual

Instruction manual
RE 92704-01-B/2020-01-21
Replaces: –.–
English
Axial piston variable pump
A10VOH
Series 60

© BoschRexrothAG 2020. 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 3/60
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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 7
1.3.4 Abbreviations 7
2 Safety instructions 8
2.1 About this chapter 8
2.2 Intended use 8
2.3 Improper use 8
2.4 Personnel qualifications 9
2.5 General safety instructions 10
2.6 Product-specific safety instructions 11
2.7 Personal protective equipment 13
3 General instructions on property damage and product damage 14
4 Scope of delivery 17
5 About this product 18
5.1 Performance description 18
5.2 Product description 18
5.2.1 Axial piston unit layout 18
5.2.2 Functional description 19
5.3 Product identification 20
6 Transportand storage 21
6.1 Transporting the axial piston unit 21
6.1.1 Transportby hand 21
6.1.2 Transportwith lifting devices 22
6.2 Storing the axial piston unit 24
7 Installation 26
7.1 Unpacking 26
7.2 Installation conditions 26
7.3 Installation position 28
7.3.1 Below-reservoir installation (standard) 28
7.3.2 Inside-reservoir installation 29
7.3.3 Above-reservoir installation 30
7.4 Installing the axial piston unit 31
Contents
7.4.1 Preparation 31
7.4.2 Dimensions 31
7.4.3 General instructions 32
7.4.4 Installation with a coupling 32
7.4.5 Installation on a gearbox 33
7.4.6 Installation with cardan shaft 33

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7.4.7 Remove the spacer (for version with through drive) 34
7.4.8 Completion of assembly 35
7.4.9 Hydraulically connecting the axial piston unit 36
7.4.10 Electrically connecting the axial piston unit 40
7.5 Performing flushing cycle 41
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 47
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 disassembly 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 Malfunction table 53
15 Technical data 57
16 Alphabetical index 58
Contents

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1 About this documentation
1.1 Validity of the documentation
This documentation is valid for the following products:
• Axial piston variable pump A10VOH Series60
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 8 and chapter3 "General instructions on property damage and
product damage" on page 14 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
pumpA10VOH.
– Order confirmation
Installation drawing
Contains the outer dimensions, all ports and the hydraulic circuit diagram for your
axial piston variable pump A10VOH.
Please request the
installation drawing
from your contact at
BoschRexroth.
Installation drawing
Axial piston variable pump A10VOH
Contains the permissible technical data, ports, main dimensions and circuit
diagrams of standard versions.
92704 Data sheet
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
BoschRexroth Fluid Rating List for Rexroth hydraulic components
(pumpsandmotors)
Contains the hydraulic fluids positively evaluated by BoschRexroth.
90245 Data sheet
Storage and preservation of axial piston units
Contains additional information on storage and preservation.
90312 Data sheet

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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 Safety instructions
This documentation contains safety instructions in chapter2.6 "Product-specific
safety instructions" on page11 and in chapter3 "General instructions on property
damage and product damage" on page14, 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.
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.

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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
A10VOH Axial piston variable pump, open circuit, high-pressure design
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 pump A10VOH" 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
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)
DG Druckregler, ferngesteuert (pressure controller, remote-controlled)
DIN Deutsches Institut für Normung (German Institute for Standardization)
DR Druckregler (pressure controller)
DRS/DRC Druck-Förderstromregler (pressure flow controller)
EP Electric proportional control
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.
▶ Observe the technical data, the application and operating conditions and
the performance limits as specified in the datasheet92704 and in the order
confirmation. Information about approved hydraulic fluids can be found in
datasheet92704.
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8.
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.
• The maximum permissible case pressure specified in the datasheetmust 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.

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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). 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.

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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 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 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!
Danger to life or risk of injury due to electric shock or 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.
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.
Escaping hydraulic fluid through leaking 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.

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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.
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.

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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.
▶ 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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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 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 filling and draining
hydraulic fluid.
▶ Use a suitable binding agent to collect any leaked hydraulic fluid.
▶ Observe the parameters in the safety datasheetfor the hydraulic fluid and the
specifications provided by the machine/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.

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4 Scope of delivery
1
1 2 2
5
3
4
Fig. 1: Axial piston unit A10VOH
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)
• Connector protective covers(3)
• For version with through drive, spacer(4) made of plastic (serves as transport
protection)
• For version with through drive, protective cover incl. mounting bolts(5)

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5 About this product
5.1 Performance description
The axial piston variable pump generates, controls and regulates a hydraulicfluid
flow. The A10VOH is designed for mobile applications such as construction
machinery.
Refer to datasheet92704 and the order confirmation for the technical data,
operating conditions and operating limits of the axial piston unit.
5.2 Product description
The A10VOH is a variable pump with axial piston rotary group of swashplate design
for hydrostatic drives in an open circuit hydraulic system. Flow is proportional to
drive speed and displacement. The flow can be steplessly changed by controlling
the cradle(13). For axial piston units with swashplate design, the pistons(11) 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
3
45
6
7
8
9
1011
12
13
Fig. 2: Layout of the A10VOH
1 Drive shaft
2 Spring
3 Retaining plate
4 Stroking piston
5 Control valve
6 High-pressure side
7 Control plate
(Distributor plate)
8 Port plate
9 Suction side
10 Cylinder
11 Piston
12 Slipper pad
13 Cradle
Open circuit

About this product 19/60
RE 92704-01-B/2020-01-21, A10VOH Series60, Bosch Rexroth AG
5.2.2 Functional description
Torque and rotational speed are applied to the drive shaft(1) by a drive motor. The
cylinder(10) is picked up and turned by the splines of the drive shaft. With every
revolution, the pistons(11) complete a stroke in the cylinder bores, the sizeof
which depends on the pitch of the cradle(13). The slipper pads(12) are held on
with the pistons and guided along the glide surface of the cradle by the retaining
plate(3). The inclined position of the cradle during a rotation causes each piston
to move over the bottom and top dead centers and back to its initial position.
During this sequence, hydraulic fluid is fed in and drained out through the two
control slots in the control plate(7) according to displacement. On the suction
side(9) hydraulicfluid flows into the piston chamber as the piston recedes. At the
same time, on the high-pressure side(6) the hydraulic fluid is pushed out of the
cylinder chamber into the hydraulic system by the pistons.
The swivel angle of the cradle(13) is infinitely variable. Adjusting the swivel angle
changes the piston stroke and, with it, the displacement. The swivel angle is
controlled hydraulically by means of the stroking piston. The cradle is mounted for
easy motion in swivel bearings. When pressurized, the cradle is held in balance by
the swiveling forces of the rotary group, which are generated by the eccentrically
mounted cradle and by the control pressure. When depressurized, the spring(2)
presses the swashplate to maximum swivel angle. Increasing the swivel angle
increases the displacement; reducing the angle reduces displacement accordingly.
Various control devices are available depending on requirements. Information
about this can be found in datasheet92704.
Pump
Control

20/60 About this product
Bosch Rexroth AG, A10VOH Series60, RE 92704-01-B/2020-01-21
5.3 Product identification
The axial piston unit can be identified by the name plate. The following example
shows an A10VOH name plate:
7201
ROTA-
TION
SN:
Made in Germany
12345678
xxxxxxxxxxxx
MNR: FD:
A10VOH145DR00/60DRVC2R102B2S40000
19W48
1
2
3
4
9
10
11
12
678
13
14
5
Fig. 3: Name plate A10VOH
1 Trademark
2 Manufacturing date
3 Internal plant designation
4 Direction of rotation (viewed on
driveshaft) – here: clockwise
5 Bar code
6 Power setting (optional)
7 Rotational speed (optional)
8 Flow setting (optional)
9 Pressure controller setting (optional)
10 Displacement (optional)
11 Serial number
12 Material number of the
axialpistonunit
13 Type code
14 Customer material number