Bosch Rexroth A10VER 52 Series User manual

<Replace this illustration area with an
illustration of your product>
Instruction manual
RE 91706-01-B/09.2015
Replaces: –.–
English
Reversible A10VER
Axial piston variable motor
for hydrostatic fan drives
Series 52

The information is provided solely for the
purpose of product description. No statement
about a specific characteristic or suitability
for a certain application can be derived from
this information. Information from the catalog
does not represent assured properties. 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.
© This document, as well as the data,
specifications and other information set forth in
it, are the exclusive property of Bosch Rexroth AG.
It may not be reproduced or given to third parties
without consent.
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.

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Contents
1 About this documentation 5
1.1 Validity of the documentation 5
1.2 Required and supplementary documentation 5
1.3 Display 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 15
3 General instructions on damage to property and the product 16
4 Scope of delivery 19
5 About this product 20
5.1 Performance description 20
5.2 Product description 20
5.2.1 Layout of the axial piston unit 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 Transporting by hand 23
6.1.2 Transporting with a lifting device 23
6.2 Storing the axial piston unit 25
7 Installation 27
7.1 Unpacking 27
7.2 Installation conditions 27
7.3 Installation position 28
7.3.1 Below-reservoir installation (standard) 28
7.3.2 Above-reservoir installation 29
7.4 Installing the axial piston unit 30
7.4.1 Preparation 30
7.4.2 Dimensions 30
7.4.3 General instructions 30
7.4.4 Installation with coupling 31
7.4.5 Installation on a gearbox 32
7.4.6 Installation with cardan shaft 32
7.4.7 Completing installation 32
7.4.8 Connecting the axial piston unit to hydraulic system 33
7.4.9 Electrically connecting the axial piston unit 37
7.5 Performing flushing cycle 38

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Contents
8 Commissioning 39
8.1 Initial commissioning 39
8.1.1 Filling the axial piston unit 39
8.1.2 Testing the hydraulic fluid supply 40
8.1.3 Performing functional test 41
8.2 Running-in phase 41
8.3 Recommissioning after standstill 42
9 Operation 43
10 Maintenance and repair 44
10.1 Cleaning and care 44
10.2 Inspection 44
10.3 Maintenance 45
10.4 Repair 45
10.5 Spare parts 46
11 Removal and replacement 47
11.1 Required tools 47
11.2 Preparing for removal 47
11.3 Performing removal 47
11.4 Preparing the components for storage or later use 47
12 Disposal 48
13 Extension and conversion 49
14 Troubleshooting 50
14.1 How to proceed with troubleshooting 50
14.2 Malfunction table 51
15 Technical data 53
16 Alphabetical index 54

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1 About this documentation
1.1 Validity of the documentation
This documentation is valid for the following products:
•Series 52 A10VER Axial piston variable motor (plug-in design, reversible)
This documentation is intended for machine/system manufacturers, assemblers and
service engineers.
This documentation contains important information on the safe and appropriate
transport, installation, commissioning, operation, maintenance, removal and simple
troubleshooting of the axial piston unit.
▶ Read this documentation completely and in particular the chapter2 “Safety
instructions” on page 8 and chapter3 “General instructions on damage to
property and the product” 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 A10VER axial piston variable
motor.
– Order confirmation
Installation drawing
Contains the outer dimensions, all connections and the hydraulic circuit diagram
for your A10VER axial piston variable motor.
Please request the
installation drawing
from your contact at
Bosch Rexroth.
Installation drawing
Axial Piston Plug-In Motor A10VER
Contains the permissible technical data.
91706 Data sheet
Project planning notes on the A10VER
Contains additional information on project planning and commissioning.
90363 Manual
Mineral oil-based hydraulic fluids and related hydrocarbons
Describes the requirements for a mineral oil-based hydraulic fluid and related
hydrocarbons for operation with Rexroth hydraulic components, and assists you
in selecting a hydraulic fluid for your hydraulic system.
90220 Data sheet
Environmentally acceptable hydraulic fluids
Describes the requirements on an environmentally friendly hydraulic fluid for
operation with Rexroth hydraulic components and assists you in selecting a
hydraulic fluid for your hydraulic system.
90221 Data sheet
Fire-resistant, water-free hydraulic fluids (HFDU/HFDR)
Describes the requirements on fire-resistant, water-free hydraulic fluids
(HFDU/HFDR) for operation with Rexroth hydraulic components and assists you
in selecting a hydraulic fluid for your hydraulic system.
90222 Data sheet
8 Commissioning 39
8.1 Initial commissioning 39
8.1.1 Filling the axial piston unit 39
8.1.2 Testing the hydraulic fluid supply 40
8.1.3 Performing functional test 41
8.2 Running-in phase 41
8.3 Recommissioning after standstill 42
9 Operation 43
10 Maintenance and repair 44
10.1 Cleaning and care 44
10.2 Inspection 44
10.3 Maintenance 45
10.4 Repair 45
10.5 Spare parts 46
11 Removal and replacement 47
11.1 Required tools 47
11.2 Preparing for removal 47
11.3 Performing removal 47
11.4 Preparing the components for storage or later use 47
12 Disposal 48
13 Extension and conversion 49
14 Troubleshooting 50
14.1 How to proceed with troubleshooting 50
14.2 Malfunction table 51
15 Technical data 53
16 Alphabetical index 54

6/56 About this documentation
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Table 1: Required and supplementary documentation
Title Document number Document type
Information for 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 Data sheet
1.3 Display of information
Standardized safety instructions, symbols, terms and abbreviations are used
throughout this documentation so that you can work quickly and safely with your
product. To give you a better understanding they are explained in the sections below.
1.3.1 Safety instructions
This documentation includes safety instructions in chapter2.6 “Product-specific
safety instructions” on page11 and in chapter3 “General instructions on damage
to property and the product” on page 16 and before a sequence of actions or an
instruction for action involving a risk of personal injury or damage to equipment.
The described danger prevention measures must be observed.
Safety instructions are set out as follows:
SIGNAL WORD
Type and source of danger
Consequences of noncompliance
▶ Measures to prevent danger
•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 the safety instructions are not complied with
•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 injuries if it is not avoided.
WARNING Identifies a dangerous situation that may result in death or
serious injuries if it is not avoided.
CAUTION Identifies a dangerous situation that may result in minor to
moderate injuries if it is not avoided.
NOTICE Property damage: The product or the environment may be
damaged.

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1.3.2 Symbols
The following symbols indicate information that is not directly relevant to safety but
increases understanding of the documentation.
Table 3: Meaning of the symbols
Symbol Meaning
If this information is disregarded, the product cannot be used and/or
operated to the optimum extent.
▶ Single, independent step
1.
2.
3.
Numbered instruction:
The numbers indicate that the steps must be completed one after the other.
1.3.3 Designations
This documentation uses the following designations:
Table 4: Designations
Designation Meaning
A10VER Axial piston variable motor, plug-in version, reversible, open circuit for
hydrostatic fan drives
Threaded plug Metal screw, pressure-resistant
Protection plug Made out of plastic, not pressure-resistant, only for transportation
The designation “axial piston unit” or “hydraulic motor” is used hereafter as a
generic term for “A10VER plug-in axial piston motor”.
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)
EZ Two point control electric
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 bolted joints and
joints with one cylindrical bolt 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 according to the generally accepted
rules of current technology. There is, however, still a danger of personal injury
or damage to equipment if this chapter and the safety instructions in this
documentation are not complied with.
▶ 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 they
are classified neither as complete nor as incomplete machines in the sense of the
EC Machinery Directive 2006/42/EC. A component is exclusively intended to form an
incomplete or a complete machine together with other components. The component
may 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 designed solely as a hydraulic motor in hydrostatic fan drives
in open circuit.
▶ Observe the technical data, the application and operating conditions and
the performance limits as specified in data sheet 91706 and in the order
confirmation. Information about approved hydraulic fluids can be found in data
sheet 91706.
The axial piston unit is only intended for professional use and not for private use.
Intended use includes having read and understood the complete documentation,
especially chapter 2 “Safety instructions” on page8.
2.3 Improper use
Any use other than that described as intended use shall be considered as improper
and is therefore impermissible.
Bosch Rexroth AG is not liable for damages resulting from improper use. The user
bears all risks from improper use.
The following foreseeable forms of misuse shall also be considered to be improper
(this list does not claim to be exhaustive):
•Use outside the operating parameters approved in the data sheet or in the order
confirmation (unless specifically approved by the customer)
•Use of non-approved fluids, e.g.,water or polyurethane components

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•Changes to factory settings by unauthorized persons
•Use of add-ons (e.g., control unit, valves) not in combination with the specified
Rexroth components
•Use of the axial piston unit 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 under a continuous pressure differential between case
to ambient pressure greater than 2bar, whereby the ambient pressure must always
be lower than the case pressure. Short-term pressure peaks (t<0.1s) of up to
10bar are permitted. Beyond this, the maximum case pressure specified on the
data sheet cannot be exceeded.
•Use of the axial piston unit in explosive environments unless the component or
machine/system has been certified as compliant with the ATEX directive 94/9/EC
•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 basic mechanical, electrical
and hydraulics expertise, as well as knowledge of the associated technical terms.
For transporting and handling the product, additional knowledge is necessary with
regard to working with lifting devices and their slings. In order to ensure safe use,
these activities should only be performed by qualified personnel or an instructed
person under the direction and supervision of qualified personnel.
Skilled persons are those who can recognize possible dangers and institute the
appropriate safety measures due to their professional training, knowledge, and
experience, as well as their understanding of the relevant regulations pertaining to
the work to be done. Qualified personnel must follow the rules relevant to their field
and have the necessary hydraulics expertise.
Hydraulic expert knowledge includes:
•Reading and fully understanding hydraulic circuit diagrams
•Specifically, fully understanding the relationships with regard to safety devices
•Understanding how hydraulic components work and are put together
Bosch Rexroth offers training support for specialized fields. An overview of the
training contents can be found online at: www.boschrexroth.de/training.

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2.5 General safety instructions
•Observe the applicable accident prevention and environmental protection regulations.
•Observe the safety regulations and provisions 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.
•Persons who install, operate, remove or maintain Rexroth products may not be under
the influence of alcohol, drugs or medication that may affect their reaction time.
•Only use genuine Rexroth accessories and spare parts to ensure there is no risk to
personnel 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 relevant for
safety, unexpected operating conditions may occur in the application, which could
result in injury to personnel or damage to equipment. For this reason, only use
the product in a safety-related application if this use is expressly specified and
permitted in the product documentation, for example in explosion protection
applications or in safety-related parts of a control system (functional safety).
•You may only commission the product if it has been determined that the end
product (e.g., machinery or 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 or the fan wheel installed. Check whether or not your machine requires
additional safety measures for your application. If necessary, make sure that these
are properly implemented.
•Depending on the type of control used, electromagnetic effects can be produced
when using solenoids. When a direct current is applied, solenoids do not cause
electromagnetic interference nor is their operation impaired by electromagnetic
interference. Other behavior can result when a modulated direct current
(e.g. PWM signal) is applied. Potential electromagnetic interference for persons
(e.g. persons with a pacemaker) and other components must be tested by the
machine manufacturer.

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2.6 Product-specific safety instructions
The following safety instructions apply to chapters 6 to 14.
WARNING
Danger from excessively high pressure.
Risk of death or injury, or property damage.
Improperly changing the factory pressure settings on the drive unit can result in a
pressure increase beyond the permissible maximum pressure.
Operating the unit above the permissible maximum pressure can cause
components to burst and hydraulic fluid to escape under high pressure.
▶ Changes to the factory settings must only be made by Bosch Rexroth specialists.
▶ In addition, a pressure relief valve is needed in the hydraulic system as a back-
up. If the axial piston unit is equipped with a pressure cut-off and/or a pressure
controller, this is not an adequate back-up against pressure overload.
Danger from suspended loads.
Risk of death or injury, or property damage.
Improper transportation may cause the axial piston unit to fall down and lead to
injuries, e.g., crushing or broken bones or damage to the product.
▶ Make sure that the load bearing capacity of the lifting gear is sufficient to safely
bear the weight of the axial piston unit.
▶ Never stand or put your hands under a suspended load.
▶ Make sure the unit remains stable during transport.
▶ Wear your personal protective equipment (e.g., safety goggles, safety gloves,
suitable working clothes, safety shoes).
▶ Use suitable lifting gear for transportation.
▶ Observe the prescribed position of the lifting strap.
▶ Observe the national laws and regulations on work and health protection and
transportation.
System/machine under pressure.
Risk of death or serious injury when working on unsecured machines/systems. Risk
of property damage.
▶ Turn off the entire system and secure it against being restarted as specified by
the machine/system manufacturer.
▶ Make sure that all relevant components in the hydraulic system are
depressurized. Follow the machine/system manufacturer’s specifications.
▶ Note that the hydraulic system may still may be under pressure even after the
pressure supply itself has been disconnected.
▶ Do not disconnect any line connections, ports and components as long as the
hydraulic system is under pressure.

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WARNING
Suction effect from running fan wheel.
Risk of death or injury. A running fan wheel produces a suction effect that can pose
a risk of entanglement.
▶ Standing in the danger zone of the rotating fan wheel is prohibited.
Before entering the danger zone ensure the fan wheel has stopped, e.g., by
disconnecting the drive source.
Unexpected fan speed control behavior.
Risk of injury from fan wheel activating on system start or after repair.
▶ When unpowered, the motor can reach maximum speed depending on the position
of the drive unit (unpowered motor is swiveled out fully with pressure build-up).
Attention: Unplugging the electrical control (ED) of the drive unit and/or
electrical control (EZ) of the hydraulic motor does not result in a safe off state,
rather it causes the fan wheel to run at maximum speed.
▶ Check whether or not your machine requires additional safety measures for
your application.
Fan wheel stationary while machine is running.
Risk of death or injury from sudden fan wheel movement.
▶ Never reach into the machine while it is running, e.g., to get the fan wheel to move.
▶ Use reversing to attempt to get the fan wheel to move again.
See also the required operating conditions and instructions on what to do as
described in project planning and commissioning instructions 90363.
▶ Check whether or not your machine requires additional safety measures for your
application.
We recommend programming the reversing function so it can only be started
when the viscosity/operating temperature in the hydraulic circuit is high enough
(testing during commissioning).
Bursting of hydraulic lines and/or damage to parts (e.g., shaft, fan blades).
Risk of death or injury, or property damage.
▶ Never unplug the solenoids while reversing operation is active.
▶ Never disconnect the power supply while reversing operation is active.

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WARNING
Escaping oil mist.
Risk of explosion and fire, health hazard, risk of environmental pollution.
▶ Depressurize the relevant machine/system part and repair the leak.
▶ Only perform welding work then 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 that any escaped 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 set up the relevant part of the machine/system so that it is free of electrical
voltage before you install the product or when connecting and disconnecting
connectors. Protect the machine/system against being re-energized.
Restriction of the control function.
Risk of injury or property damage.
Moving parts in control equipment (e.g., valve spools) can, under certain
circumstances, get blocked in position as a result of contamination (e.g., impure
hydraulic fluid, abrasion, or residual dirt from components). As a result, the flow
of hydraulic fluid and the build-up of momentum in the axial piston unit can no
longer meet the operator's specifications. Even the use of different filter cartridges
(external or internal inlet filter) will not rule out a fault but merely reduce the risk.
▶ Check whether remedial measures for your application are needed on your
machine in order to put the driven consumer in a safe state (e.g., safe stop).
▶ If necessary, make sure that these are properly implemented.

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CAUTION
High noise levels during operation.
Risk of hearing damage or hearing loss.
The noise emission of axial piston units depends on, among other factors,
rotational speed, working pressure and installation conditions. The sound pressure
level may rise above 70 dB (A) in certain application conditions.
▶ Always wear hearing protection when in the vicinity of the operating axial piston unit.
Hot surfaces on the axial piston unit.
Risk of burns.
▶ Allow the axial piston unit to cool down sufficiently before touching it.
▶ Wear heat-resistant protective clothing, e.g., gloves.
Improper routing of cables and lines.
Risk of stumbling and property damage. Improper routing of cables and lines can
cause a risk of tripping as well as damage to equipment and components, e.g., lines
and plugs tearing.
▶ Always lay cables and lines in such a way that no one can trip over them, that
they do not become kinked or twisted, do not rub on edges and do not run
without adequate protection from sharp-edged ducts.
Contact with hydraulic fluid.
Inhalation may result in health hazards or adverse health effects, including eye
injuries, skin irritation and poisoning.
▶ Avoid contact with hydraulic fluids.
▶ When working with hydraulic fluids, strictly observe the safety instructions
provided by the lubricant manufacturer.
▶ Wear your personal protective equipment (e.g., safety goggles, safety gloves,
suitable working clothes, safety shoes).
▶ Consult a doctor immediately if hydraulic fluid gets in your eyes or bloodstream,
or is swallowed.
Escaping hydraulic fluid due to machine/system leakage.
Risk of burns and injury from escaping oil jet.
▶ Depressurize the relevant machine/system part and repair the leak.
▶ Never attempt to block or seal the leak or oil jet with a rag.
Danger from improper handling.
Risk of slipping. 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.

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2.7 Personal protective equipment
Personal protective equipment is the responsibility of the user of the axial piston
unit. Observe the safety regulations and provisions in your country.
All pieces of personal protective equipment must be intact.

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3 General instructions on damage to
property and the product
The following information applies to chapters 6 to 14.
NOTICE
Danger from improper handling.
Product can be damaged.
▶ Do not expose the product to excessive mechanical load.
▶ Never grab or climb onto the product.
▶ Do not place/lay 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 fittings.
▶ Do not strike fittings (e.g., sensors or valves).
▶ Do not strike sealing surfaces (e.g., working line ports).
▶ Leave the protective covers on the axial piston unit until you connect the lines.
▶ Disconnect all electrical connectors before electro-welding or painting.
▶ Make certain that the electronic components (e.g., sensors) do not become
electrostatically charged (e.g., during painting operations).
Risk of property damage due to improper 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; if necessary,
recommission. With above-reservoir installation, the housing area may drain
via the drain line after longer periods of disuse (air enters via the shaft seal)
or via the working line (gap leakage). This means the bearings are insufficiently
lubricated when the system is turned on.
Mixing of 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 mixing of hydraulic fluids from different manufacturers or different types
from the same manufacturer is generally not permitted.

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NOTICE
Contamination of the hydraulic fluid.
The cleanliness of the hydraulic fluid has a considerable impact on the cleanliness
and service life of the hydraulic system. Contamination of the hydraulic fluid can
cause premature wear and malfunctions.
▶ Make sure that the working environment at the installation site is fully free
of dust and foreign substances in order to prevent foreign particles, such as
welding beads or metal cuttings, from getting into the hydraulic lines and
causing product wear or malfunctions. The axial piston unit must be installed in
clean condition.
▶ Use only clean connections, hydraulic lines and attachments (e.g., measuring
equipment).
▶ No contaminants may enter the ports when they are sealed.
▶ Before commissioning, make sure that all hydraulic connections are tight and that
all of the seals and plugs are installed correctly to ensure that they are leak proof
and fluids and foreign particles are prevented from penetrating the product.
▶ Use a suitable filter system to filter hydraulic fluid during filling to minimize solid
impurities and water in the hydraulic system.
Improper cleaning.
Product can be damaged.
▶ Plug all openings with the appropriate protection equipment in order to prevent
cleaning agents from entering the hydraulic system.
▶ Never use solvents or corrosive cleaning agents. Use only water and, if
necessary, a mild cleaning agent to clean the axial piston unit.
▶ Do not point the high-pressure cleaner at sensitive components, e.g. shaft seal,
electrical connections and components.
▶ Use lint-free cloths for cleaning.
Environmental pollution due to improper disposal.
Careless disposal of the axial piston unit and its fittings, the hydraulic fluid and the
packaging material can result in environmental pollution.
▶ Dispose of the axial piston unit, hydraulic fluid and packaging in accordance
with the national regulations in your country.
▶ Dispose of the hydraulic fluid in accordance with the applicable safety data
sheet for the hydraulic fluid.
Danger from chemical or corrosive 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. Hydraulic fluid can escape if leaks occur.
▶ Take appropriate steps to protect the axial piston unit from chemical or
corrosive environmental conditions.

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NOTICE
Escaping or spilling hydraulic fluid.
Risk of environmental pollution and contamination of groundwater.
▶ Always place a collecting pan under the axial piston unit when filling and
draining the hydraulic fluid.
▶ Use an oil binding agent if hydraulic fluid is spilled.
▶ Observe the information in the safety data sheet for the hydraulic fluid and the
specifications provided by the system manufacturer.
Danger from hot components.
Nearby products can be damaged. Components which heat up (e.g., solenoids) can
cause damage to nearby products if they are too close.
▶ When installing the axial piston unit, check the distances to nearby products to
ensure that they are not damaged.
The warranty only applies to the delivered configuration.
The warranty is void in case of improper installation, commissioning and operation,
as well as improper use and/or improper handling. Warranty entitlement is also
rendered void if service work is performed by anyone other than Bosch Rexroth
Service or is not performed within the specified intervals.

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4 Scope of delivery
2
3
1
Fig. 1: Axial piston unit
The following is included in the scope of delivery:
•Axial piston unit as per order confirmation
The following parts are also assembled prior to delivery:
•Protective covers (1)
•Protective plug/threaded plug(2)
•Solenoid plug protective cover (3)

20/56 About this product
Bosch Rexroth AG, A10VER Series 52, RE 91706-01-B/09.2015
5 About this product
5.1 Performance description
The A10VER Axial piston variable motor converts hydrostatic flow into mechanical
rotation, then controls/regulates this rotation. It is designed for mobile applications,
specifically hydrostatic fan drives.
Refer to data sheet 91706 and the order confirmation for the technical data,
operating conditions and operating limits of the axial piston unit.
5.2 Product description
The variable motor is available in the A10VER plug-in version. The A10VER is a
variable motor with axial piston rotary group in swashplate design for hydrostatic
drives in an open circuit. For axial piston units with swashplate design, the
pistons(7) are arranged axially relative to the drive shaft (1). The pistons place a
load on the swashplate (cradle)(9) and transfer the torque dependent on pressure
and swivel angle via the cylinder to the drive shaft(6). The cylinder and drive shaft
are interlocked. The control of the swashplate (cradle) can change the specific
torque and displacement.
In an open circuit, the hydraulic fluid flows from the reservoir to the hydraulic pump
from where it is transported to the hydraulic motor. From the hydraulic motor, the
hydraulic fluid flows directly back to the reservoir. The output speed of the hydraulic
motor is changed by overcentering the cradle (9) to ‒100% Vg max, all without altering
the pressure side.
5.2.1 Layout of the axial piston unit
5
4
1
8
9
6
7
3
212
11
10
Fig. 2: Layout of the A10VER hydraulic motor
1 Drive shaft
2 Retainer plate
3 Stroking piston
4 Control plate
(distributor plate)
5 Port plate
6 Cylinder
7 Piston
8 Slipper pad
9 Swashplate (cradle)
10 EZ control valve
11 Overrun valve
12 Time-delay orifice
Open circuit