Bosch Rexroth 70 Series User manual

Instruction manual
RE 91071-01-B/06.2018
Replaces: 03.2015
English
Axial piston fixed motor
A2FM/A2FE/
A2FMT
Series 70

© Bosch Rexroth AG 2018. 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 3/56
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1 About this manual 5
1.1 Applicability 5
1.2 Required and supplementary documentation 5
1.3 Representation of information 6
1.3.1 Safety instructions 6
1.3.2 Symbols 6
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 notices regarding property 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 19
6 Transport and storage 20
6.1 Transporting the axial piston unit 20
6.1.1 Transporting by hand 21
6.1.2 Transporting with a lifting device 21
6.2 Storing the axial piston unit 22
7 Installation 25
7.1 Unpacking 25
7.2 Installation conditions 25
7.3 Installation position 26
7.3.1 Below-reservoir installation (standard) 26
7.3.2 Above-reservoir installation 27
7.4 Installing the axial piston unit 28
7.4.1 Preparation 28
7.4.2 Dimensions 28
7.4.3 General instructions 29
7.4.4 Installation with a clutch 29
7.4.5 Installation on a gearbox 30
7.4.6 Completing installation 30
7.4.7 Hydraulically connecting the axial piston unit 31
7.5 Performing flushing cycle 38
Contents

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8 Commissioning 39
8.1 Initial commissioning 39
8.1.1 Filling the axial piston unit 40
8.1.2 Testing the hydraulic fluid supply 41
8.1.3 Performing a functional test 41
8.2 Running-in phase 42
8.3 Recommissioning after standstill 42
9 Operation 43
10 Maintenance and repair 44
10.1 Cleaning and care 44
10.2 Inspection 45
10.3 Maintenance 45
10.4 Repair 46
10.5 Spare parts 46
11 Removal and replacement 47
11.1 Required tools 47
11.2 Preparing for removal 47
11.3 Removal 47
11.4 Preparing the components for storage or further use 47
12 Disposal 48
13 Extension and conversion 48
14 Troubleshooting 49
14.1 How to troubleshoot 49
14.2 Malfunction table 50
15 Technical data 52
16 Alphabetical index 54
Contents

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1 About this manual
1.1 Applicability
This manual applies to the following products:
•Axial piston fixed motor A2FM series 70 (standard version)
•Axial piston fixed motor A2FE series 70 (plug-in version)
•Axial piston fixed motor A2FMT series 70 (for drum drives)
This manual is intended for machine/system manufacturers, assemblers and service
engineers.
It contains important information on the safe and appropriate transport, installation,
commissioning, operation, maintenance, removal and simple troubleshooting of the
axial piston unit.
▶ Read this manual completely, in particular Chapter 2 “Safety instructions” on
page 8 and Chapter 3 “General notices regarding property 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 of your A2FM, A2FE or A2FMT axial
piston fixed motor.
– Order confirmation
Installation drawing
Contains the outer dimensions, all connections and the hydraulic schematic of
your A2FM, A2FE or A2FMT axial piston fixed motor.
Please request the
installation drawing
from your contact at
Bosch Rexroth.
Installation drawing
Axial piston fixed motor A2FM, axial piston plug-in motor A2FE series 70
Contains the permissible technical data.
91071 Data sheet
Axial piston fixed motor A2FMT series 70
Contains the permissible technical data.
91072 Data sheet
DSM speed sensor series 10 95132 Data sheet
DSA speed sensor series 12 95133 Data sheet
Counterbalance valve BVD 95522 Data sheet
Mineral oil-based hydraulicfluids and related hydrocarbons
Describes the requirements on a mineral oil-basedhydraulic 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 acceptable hydraulic fluid for
operation with Rexroth hydraulic components and assists you in selecting
a hydraulic fluid for your hydraulic system.
90221 Data sheet
Information on the use of hydrostatic drives at low temperatures
Contains additional information on the use of Rexroth axial piston units at low
temperatures.
90300-03-B Manual
Storage and preservation of axial piston units
Contains additional information on storage and preservation.
90312 Data sheet

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Bosch Rexroth AG, A2FM/A2FE/A2FMT Series 70, RE 91071-01-B/06.2018
1.3 Representation of information
Standardized safety instructions, symbols, terms and abbreviations are used
throughout this manual so that you can work quickly and safely with your product.
For clarification, they are explained in the sections below.
1.3.1 Safety instructions
This manual contains safety instructions in Chapter 2.6 “Product-specific safety
instructions” on page 11 and in Chapter 3 “General notices regarding property
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 or property damage. Always
follow the instructions on avoiding the dangers associated with the use of this
product.
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 safety instructions are not complied with
•Precautions: states how the danger can be avoided
Table 2: Danger 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 the environment may get
damaged.
1.3.2 Symbols
The following symbols indicate information that is not safety-relevant but increases
understanding of the manual.
Table 3: Meaning of symbols
Symbol Meaning
If this information is disregarded, the product cannot be used and/or
operated to its full extent.
▶ Single, independent action
1.
2.
3.
Numbered instruction:
The numbers indicate that the actions must be completed in order.

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1.3.3 Designations
This documentation uses the following designations:
Table 4: Designations
Designation Meaning
A2FM Axial piston fixed motor in standard version, open and closed circuit
A2FE Axial piston fixed motor in plug-in version, open and closed circuit
A2FMT Axial piston fixed motor, closed circuit, for use in concrete mixer trucks
Threaded plug Metal screw, pressure-resistant
Protective plug Made out of plastic, not pressure-resistant, only for transportation
The designation “axial piston unit” is used from this point forward as a generic term
for the “A2FM axial piston fixed motor”, “A2FE axial piston plug-in motor” or “A2FMT
axial piston fixed motor”.
1.3.4 Abbreviations
This manual uses the following abbreviations:
Table 5: Abbreviations
Abbreviation Meaning
ATEX EC directive on explosion protection (Atmosphère explosible)
DIN Deutsches Institut für Normung (German Institute for Standardization)
ISO International Organization for Standardization
JIS Japan Industrial Standard
RE Rexroth document in the English language
VDI2230 Standard for systematically calculating heavy-duty threaded connections
and cylindrical screwed connections 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 manual are not observed.
▶ Read this manual completely and thoroughly before working with the axial piston
unit.
▶ Keep it 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 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 A2FM and A2FE axial piston units are only approved as hydraulic motors in
hydrostatic drives.
The A2FMT axial piston unit is only approved as a hydraulic motor for hydrostatic
drum drives in a closed circuit in concrete mixer trucks.
▶ Observe the technical data, the application and operating conditions, and the
performance limits as specified in data sheet 91071/91072 and in the order
confirmation. Information on approved hydraulic fluids can be found in data
sheets 91071 and 91072.
The axial piston unit is only intended for commercial use and not for private use.
Intended use includes having fully read and understood this manual, 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 misuses are also considered improper (this list is not
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
•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
•Use of the axial piston unit under a continuous pressure differential between
housing and ambient pressure greater than 2 bar, with the ambient pressure always
lower than the case pressure. Momentary (t< 0.1 s) pressure peaks of up to 10 bar
are permissible. Beyond this, the maximum permissible case pressure specified in
the data sheet should not 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 2014/34/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 manual require a basic understanding of mechanics,
electricity and hydraulics, as well as familiarity with associated technical terms.
For transporting and handling the product, additional familiarity with the use of
lifting devices and lifting accessories is required. 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.
Qualified 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 hazards and take the
appropriate safety measures. Qualified personnel must follow the rules relevant to
their field and have the necessary hydraulics expertise.
Expertise in hydraulics includes:
•Being able to read and fully understand hydraulic circuit diagrams
•In particular, 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.com/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.
•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 due to 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 applications 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 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 end. Check whether or not your machine requires additional safety measures
for your application. If necessary, make sure that these are properly implemented.

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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 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 should only be made by Bosch Rexroth
specialists.
▶ In addition, a pressure relief valve is required 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
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 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 devices 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!
▶ Switch off the entire system and secure it against reactivation according to the
parameters provided by the machine/system manufacturer.
▶ Make sure that all relevant components of 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
Escaping hydraulic fluid mist!
Risk of explosion and fire, 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 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 disconnect the relevant part of the machine/system before installing the
product or when inserting/removing connectors. Protect the machine/system
against being re-energized.
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 limitation or loss of the load holding function 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 that these are properly implemented.
CAUTION
High noise development 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 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 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 through sharp-edged ducts.

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CAUTION
Contact with hydraulic fluid!
Risk of adverse health effects, e.g. eye injury, skin irritation, poisoning from
inhalation!
▶ 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 leakage from machine/system components!
Risk of burning and injury due to escaping hydraulic fluid jet!
▶ Depressurize the relevant machine/system component and repair the leak.
▶ Never attempt to block or seal the leak or hydraulic fluid jet with a cloth.
Danger from improper handling!
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/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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Bosch Rexroth AG, A2FM/A2FE/A2FMT Series 70, RE 91071-01-B/06.2018
3 General notices regarding property and
product damage
The following instructions apply to chapters 6 to 14.
NOTICE
Danger from improper handling!
Product can be damaged!
▶ Do not expose the product to excessive mechanical loads.
▶ 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 assembled parts.
▶ Do not strike assembled parts (e.g. sensors or valves).
▶ Do not strike sealing surfaces (e.g. at working ports).
▶ Leave the protective covers on the axial piston unit until you connect the lines.
▶ Disconnect all electrical connectors before arc welding or painting.
▶ Make sure that 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. Avoid air inclusions in the forward drive shaft
bearing, especially with the axial piston unit installed with the drive shaft up.
▶ 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.
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.
▶ Never mix hydraulic fluids from different manufacturers or different types from
the same manufacturer.

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NOTICE
Contamination of 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 completely
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 should be clean
when installed.
▶ Use only clean connections, hydraulic lines and assembled parts (e.g. measuring
devices).
▶ Do not allow any contamination into the ports when they are being plugged.
▶ Before commissioning, make sure that all hydraulic connections are tight and
that all of the seals and plug-in connections are installed correctly to ensure
that they are leak-proof, and fluids and foreign particles cannot enter into the
product.
▶ Use a suitable filter system to filter hydraulic fluid during filling to minimize solid
particle contamination and water in the hydraulic system.
Improper cleaning!
Product can be damaged!
▶ Close all openings with appropriate protective covers 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 a high-pressure cleaner at sensitive components, e.g. shaft seal,
electrical connections and components.
▶ Use fiber-free 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 result in 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.
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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Bosch Rexroth AG, A2FM/A2FE/A2FMT Series 70, RE 91071-01-B/06.2018
NOTICE
Escaping or spilling hydraulic fluid!
Risk of environmental pollution and contamination of ground water!
▶ Always place a drip tray under the axial piston unit when adding and draining
the hydraulic fluid.
▶ Use a suitable binding agent if hydraulic fluid is spilled.
▶ Observe the safety data sheet for the hydraulic fluid and the specifications
provided by the system manufacturer.
Danger from hot components!
Nearby products can be damaged! Components that 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 machine as delivered.
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
2
2
Fig. 1: Axial piston unit
The scope of delivery includes the following:
•Axial piston unit as per order confirmation
The following parts come assembled on the unit:
•Protective covers (1)
•Protective/threaded plugs(2)

18/56 About this product
Bosch Rexroth AG, A2FM/A2FE/A2FMT Series 70, RE 91071-01-B/06.2018
5 About this product
5.1 Performance description
An axial piston fixed motor converts hydrostatic flow into mechanical rotation. It is
designed for mobile and stationary applications.
Refer to data sheets 91071 and 91072, and the order confirmation for the technical
data, operating conditions and operating limits of the axial piston unit.
5.2 Product description
The fixed motor is available in the A2FM standard version and the A2FE plug-in
version. The A2FM/A2FE is a fixed motor with an axial tapered piston rotary group
with a bent-axis design for hydrostatic drives in open and closed circuits. The A2FMT
is a fixed motor with an axial tapered piston rotary group with a bent-axis design
for closed-circuit hydrostatic drum drives in concrete mixer trucks. In axial piston
units with a bent-axis design, the pistons (2) are arranged at an angle to the drive
shaft (1). The pistons rest directly on the drive shaft where they generate torque
depending on the pressure.
In an open circuit, the hydraulic fluid flows from the reservoir to the hydraulic pump,
where it is transported to the hydraulic motor. The hydraulic fluid flows from the
hydraulic motor directly back to the reservoir. The output direction the hydraulic
motor can be changed with a directional valve.
In the closed circuit, the hydraulic fluid flows from the hydraulic pump to the
hydraulic motor, then directly back to the hydraulic pump. The output direction of
the hydraulic motor can be changed, e.g. by reversing the flow direction in the
hydraulic pump.
5.2.1 Axial piston unit layout
1
2
4
5
6
3
Fig. 2: Series 70 A2FM layout
1 Drive shaft
2 Piston
3 Cylinder
4 Control plate
5 Working ports
6 Drive shaft flange
Open circuit
Closed circuit

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5.2.2 Functional description
A hydraulic motor converts hydrostatic energy into mechanical energy. Hydraulic fluid
is fed to the cylinder bores through the working ports(5) and the control plate(4).
The pistons(2) in the cylinder bores complete a stroke that is converted into rotary
movement by the pistons on the drive shaft flange(6). During this process, the
pistons move the cylinder(3) and generate output torque on the drive shaft. This
output torque increases with the pressure difference between the high-pressure and
low-pressure sides. The output speed is proportional to the inward flow and
inversely proportional to the displacement of the hydraulic motor.
5.3 Product identification
The axial piston unit can be identified by the name plate. The following example
shows an A2FM name plate:
CNR:
MNR:
SN:
FD: Rotation:
DE–89275 Elchingen
Made in Germany
X1234567890Y
R90XXXXXXX SC: X
12345678
Rexroth
17W18
m XXX kg
7202
Typ: A2FMM080/70NWVN4Z902T00-0
1
2
7
3
4
5
6
12
11
10
9
8
Fig. 3: A2FM name plate
1 Manufacturer
2 Sample category (optional)
3 Internal factory designation
4 Designated area for inspection stamp
5 Direction of rotation (viewed on drive
shaft) – here: bi-directional
6 Weight (optional)
7 Bar code
8 Manufacturing date
9 Serial number
10 Material number of the axial piston unit
11 Type code
12 Customer material number
Motor function

20/56 Transport and storage
Bosch Rexroth AG, A2FM/A2FE/A2FMT Series 70, RE 91071-01-B/06.2018
6 Transport and storage
▶ Always observe the necessary ambient conditions for transport and storage, see
chapter 6.2 “Storing the axial piston unit” on page 22.
Information on unpacking can be found in chapter 7.1 “Unpacking” on page 25.
6.1 Transporting the axial piston unit
The following transportation options are available depending on weight and duration
of transport:
•Transporting by hand (chapter not relevant for this axial piston unit)
•Transporting with a lifting device (eye bolt or lifting strap)
Table 6: Dimensions and weights for A2FMN/A2FEN
Nominal pressure 300 bar, max. pressure 350 bar
Size 56 63 80 90 107
Weight kg 17 17 17 23 23
Width mm Dimensions vary by equipment. The values applicable for your axial piston
unit can be found in the installation drawing (request if necessary).
Height mm
Depth mm
Table 7: Dimensions and weights for A2FMM/A2FEM
Nominal pressure 400 bar, max. pressure 450 bar
Size 45 56 63 80 90
Weight kg 17 17 17 23 23
Width mm Dimensions vary by equipment. The values applicable for your axial piston
unit can be found in the installation drawing (request if necessary).
Height mm
Depth mm
Table 8: Dimensions and weights for A2FMH/A2FEH
Nominal pressure 450 bar, max. pressure 500 bar
Size 45 56 63 80 90
Weight kg 17 17 17 23 23
Width mm Dimensions vary by equipment. The values applicable for your axial piston
unit can be found in the installation drawing (request if necessary).
Height mm
Depth mm
Table 9: Dimensions and weights for A2FMT
Max. pressure 420 bar
Size 56 63 80 90 107
Weight kg 17 17 17 23 23
Width mm Dimensions vary by equipment. The values applicable for your axial piston
unit can be found in the installation drawing (request if necessary).
Height mm
Depth mm
Weight may vary by equipment.
Dimensions and
weights