SKF RA User manual

Assembly Instructions
RA multi-line pumps
for SKF MultiFlex multi-line centralized lubrication systems
Created on:
03.08.2023
Document no.:
951-170-230-EN
Version:
03
Read these instructions before
installation or start
-up of the
product and keep
them readily
available for later consultation!

2
Original EC Declaration of Incorporation in accordance with Directive 2006/42/EC,
Appendix II Part 1 B
The manufacturer hereby declares at its sole responsibility that the partly completed machinery conforms to the essential health and safety requirements
of the Machinery Directive 2006/42/EC, Annex I, marked in the Annex to the EC Declaration of Incorporation as applicable and fulfilled at the time of placing
on the market.
The special technical documents were prepared following Annex VII part B. Upon justifiable request, these special technical documents can be forwarded
electronically to the respective national authorities. The authorized company for the compilation of the technical documentation is the manufacturer.
Designation:
Electrically operated pump for the feeding of lubricants in interval operation inside a centralized lubrication system
Type:
RA
Furthermore, the following directives and standards were applied in the respective applicable areas:
2006/42/EC: Machinery Directive
2011/65/EU: RoHS II
2014/30/EU: Electromagnetic Compatibility
EN ISO 12100:2010
EN 60204-1:2018
EN 61000-6-2:2005/AC:2005
EN 61000-6-4:2007/A1:2011
EN 61131-2:2007
EN 809:1998+A1:2009/AC:2010
EN 60034-1:2010/AC:2010
EN 60947-5-1:2004/A1:2009
EN 60947-5-2:2007/A1:2012
EN IEC 63000:2018
The partly completed machinery must not be put into service until it has been established that the machinery into which it is to be incorporated is in
compliance with the provisions of the Machinery Directive 2006/42/EC and all other applicable Directives.
Walldorf, 03.08.2023
Jürgen Kreutzkämper
Stefan Schürmann
Manager, R&D
Germany
Manager, PD
Germany South
Manufacturer: SKF Lubrication Systems Germany GmbH, Heinrich-Hertz-Str. 2-8, 69190 Walldorf, Germany
Original UK Declaration of incorporation according to the Supply of Machinery (Safety)
Regulations 2008 No. 1597 Annex II
The manufacturer hereby declares under sole responsibility that the partly completed machinery complies with the essential health and safety
requirements of UK legislation Supply of Machinery (Safety) Regulations 2008 No. 1597 Annex I, marked in the Annex to the EC Declaration of
Incorporation as applicable and fulfilled at the time of placing on the market.
The special technical documents were prepared following Annex VII part B. Upon justifiable request, these special technical documents can be forwarded
electronically to the respective national authorities. The authorized company for the compilation of the technical documentation is SKF (U.K.) Limited,
2 Canada Close, Banbury, Oxfordshire, OX16 2RT, GBR.
Designation:
Electrically operated pump for the feeding of lubricants in interval operation inside a centralized lubrication system
Type:
RA
Furthermore, the following regulations and standards were applied in the respective applicable areas:
Supply of Machinery (Safety) Regulations 2008 No. 1597
Electromagnetic Compatibility Ordinance 2016 No. 1091
The Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2012 No. 3032
EN ISO 12100:2010
EN 60204-1:2018
EN 61000-6-2:2005/AC:2005
EN 61000-6-4:2007/A1:2011
EN 61131-2:2007
EN 809:1998+A1:2009/AC:2010
EN 60034-1:2010/AC:2010
EN 60947-5-1:2004/A1:2009
EN 60947-5-2:2007/A1:2012
EN IEC 63000:2018
The partly completed machinery must not be put into service until it has been established that the machinery into which it is to be incorporated is in
compliance with the provisions of UK legislation Supply of Machinery (Safety) Regulations 2008 No. 1597 and all other applicable Directives.
Walldorf, 03.08.2023
Jürgen Kreutzkämper
Stefan Schürmann
Manager, R&D
Germany
Manager, PD
Germany South
Manufacturer: SKF Lubrication Systems Germany GmbH, Heinrich-Hertz-Str. 2-8, 69190 Walldorf, Germany

3
Appendix to Declaration of Incorporation in accordance with 2006/42/EC, Annex II, No. 1 B
Description of the essential health and safety requirements according to 2006/42/EC, Annex I, which have been applied and fulfilled:
Table 1
Appendix to Declaration of Incorporation
Piston pumps with reservoir, with/without external motor, without control unit
Types: P205, P208, P212, P215, P230, ZPUxx, JM, FF, FB, FK, RA, TA, TB
No.:
Essential health and safety requirement
Applicable:
Fulfilled:
1.1
Principles
1.1.2
Principles of safety integration
Yes
Yes
1.1.3
Materials and products
Yes
Not completely fulfilled 1)
1.1.5
Design of machinery to facilitate its handling
Yes
Yes
1.1.6
Ergonomics
Yes
Not completely fulfilled 2)
1.2
Control systems
1.2.1
Safety and reliability of control systems
Yes
Yes
1.2.3
Starting
Yes
Yes
1.2.6
Failure of the power supply
Yes
Yes
1.3
Protection against mechanical hazards
1.3.1
Risk of loss of stability
Yes
Yes
1.3.2
Risk of break-up during operation
Yes
Not completely fulfilled 3)
1.3.4
Risks due to surfaces, edges or angles
Yes
Yes
1.3.7
Risks related to moving parts
Yes
Yes
1.3.9
Risks of uncontrolled movements
Yes
Yes
1.5
Risks due to other hazards
1.5.1
Electricity supply
Yes
Yes
1.5.6
Fire
Yes
Yes
1.5.8
Noise
Yes
Yes
1.5.13
Emissions of hazardous materials and substances
Yes
Yes
1.5.15
Risk of slipping, tripping, or falling
Yes
Not completely fulfilled 4)
1.6
Servicing
1.6.1
Machinery maintenance
Yes
Yes
1.6.2
Access to operating positions and servicing points
Yes
Not completely fulfilled 5)
1.6.4
Operator interventions
Yes
Yes
1.7
Information
1.7.1
Information and warnings on the machinery
Yes
Yes
1.7.1.1
Information and information devices
Yes
Yes
1.7.2
Warning of residual risks
Yes
Yes
1.7.3
Marking of machinery
Yes
Yes
1.7.4
Operating instructions/assembly instructions
Yes
Yes
1.7.4.1
General principles for the drafting of operating
instructions/assembly instructions
Yes
Yes
1.7.4.2
Contents of the operating instructions/assembly instructions
Yes
Yes
1.7.4.3
Sales literature
Yes
Yes
1) The product is designed for operation with non-hazardous media. The owner-operator must check whether the lubricant used has certain hazardous
effects (such as sensitization). The installation of a drip pan could be required. Pressure-relief valves must also be used.
2) The operator must ensure that the pump is integrated into the higher-level machine in such a way that the pump can be operated and filled
ergonomically.
3) The operator must protect the lubrication system against excessive pressure. This should be done by fitting every pump element with a pressure limiting
valve with suitable opening pressure (see the “Technical data” for the pump in question).
4) Not relevant inside the incomplete machine (pump), only outside the partially completed machine. The machine's owner or operator is responsible here.
5) The owner-operator must ensure that the pump is integrated into the main machine in such a way that it can be operated without danger.

4
Masthead
Manufacturer
SKF Lubrication Systems Germany GmbH
Email: Lubrication-[email protected]
www.skf.com/lubrication
Berlin Plant
Motzener Strasse 35/37
12277 Berlin
Germany
Tel. [phone]
Fax [phone]
Walldorf Plant
Heinrich-Hertz-Strasse 2-8
69190 Walldorf, Germany
Germany
Tel.: [phone]
Fax: [phone]
Authorized local distributors
- Great Britain -
SKF (U.K.) Limited,
2 Canada Close, Banbury, Oxfordshire,
OX16 2RT, GBR.
- North America -
SKF Lubrication Business Unit
Lincoln Industrial
5148 North Hanley Road, St. Louis,
MO. 63134 USA
- South America -
SKF Argentina Pte. Roca 4145,
CP 2001 Rosario, Santa Fe
Warranty
The instructions contain no statements regarding the warranty
or liability for defects. That information can be found in our
General Terms of Payment and Delivery.
Training
We conduct detailed training in order to enable maximum
safety and efficiency. We recommend taking advantage of this
training. For further information, contact your authorized SKF
dealer or the manufacturer.

5
Table of contents
Masthead ...............................................................................................4
Table of contents..................................................................................5
Safety alerts, visual presentation, and layout.................................7
1. Safety instructions...........................................................................8
1.1 General safety instructions......................................................8
1.2 General electrical safety instructions.....................................8
1.3 General behaviour when handling the product ...................8
1.4 Intended use...............................................................................8
1.5 Persons authorized to use the product.................................8
1.6 Foreseeable misuse ..................................................................9
1.7 Referenced documents ............................................................9
1.8 Prohibition of certain activities ...............................................9
1.9 Painting plastic components and seals .................................9
1.10 Safety markings on the product ..........................................9
1.11 Note on the type plate ........................................................10
1.12 Notes on CE marking .......................................................... 10
1.13 Note on Low Voltage Directive.......................................... 10
1.14 Note on Pressure Equipment Directive........................... 10
1.15 Note on UKCA marking....................................................... 10
1.16 Note on EAC marking.......................................................... 10
1.17 Note on China RoHS mark................................................. 10
1.18 Emergency shutdown ......................................................... 10
1.19 First start-up, daily start-up.............................................. 10
1.20 Residual risks........................................................................ 11
2. Lubricants ...................................................................................... 12
2.1 General information............................................................... 12
2.2 Material compatibility ............................................................ 12
2.3 Temperature properties........................................................12
2.4 Aging of lubricants .................................................................12
2.5 Avoidance of faults and hazards.......................................... 12
2.6 Solid lubricants ....................................................................... 12
3. Overview, functional description................................................ 13
3.1 RA pump with rotary drive, coaxial..................................... 13
3.2 RA pump, rotary with coaxial gear...................................... 13
3.3 RA pump, rotary with bevel gear ........................................ 13
3.4 RA pump with electric motor, coaxial................................. 13
3.5 RA pump with electric motor and coaxial gear................. 13
3.6 RA pump with electric motor and bevel gear ................... 14
3.7 RA pump with rotary drive, bevel gear, and grease
reservoir.......................................................................................... 14
3.7.1 RA pump with electric motor, coaxial gear, and
grease reservoir....................................................................14
3.8 RA pump with electric motor, bevel gear, and grease
reservoir.......................................................................................... 14
3.9 RA pump with electric motor, coaxial, with oil reservoir 15
3.10 RA pump with electric motor, coaxial gear, and oil
reservoir.......................................................................................... 15
3.10.1 RA pump with electric motor, bevel gear, and oil
reservoir ................................................................................. 15
3.11 Mode of operation.............................................................16
4. Technical data ............................................................................... 17
4.1 RA pump with rotary drive, coaxial..................................... 17
4.2 RA pump with rotary drive, coaxial gear............................ 19
4.3 RA pump with rotary drive and bevel gear ....................... 21
4.4 RA pump with electric motor, coaxial................................. 23
4.5 RA pump with electric motor, coaxial gear........................ 25
4.6 RA pump with electric motor, bevel gear .......................... 27
4.7 RA pump with 3l oil reservoir, coaxial................................29
4.8 RA pump with 3l oil reservoir, coaxial gear....................... 30
4.9 RA pump with 3l oil reservoir, bevel gear ......................... 32
4.10 RA pump with 7l oil reservoir, coaxial..............................33
4.11 RA pump with 7l oil reservoir, coaxial gear .................... 34
4.12 RA pump with 7l oil reservoir, bevel gear.......................35
4.13 RA pump with 15l oil reservoir, coaxial........................... 36
4.14 RA pump with 15l oil reservoir, coaxial gear.................. 37
4.15 RA pump with 15l oil reservoir, bevel gear .................... 38
4.16 RA pump, rotary with grease reservoir and bevel gear40
4.17 RA pump with grease reservoir, electric motor, and
coaxial gear.....................................................................................42
4.18 RA pump with grease reservoir, electric motor, and
bevel gear .......................................................................................44
4.19 Lubricant level switch for oil (V) and grease (E)............. 47
4.20 Lubricant level switch for grease (F) ................................47
5. Delivery, returns, storage............................................................ 48
5.1 Delivery.....................................................................................48
5.2 Return shipment.....................................................................48
5.3 Storage..................................................................................... 48
5.4 Storage temperature range ................................................. 48
5.5 Storage conditions for products filled with lubricant....... 48
5.5.1 Storage period up to 6 months...............................48
5.5.2 Storage period between 6 and 18 months........... 48
5.5.3 Storage period more than 18 months...................48
5.6 Declaration of decontamination ..........................................48
6. Assembly ........................................................................................ 49
6.1 Connection of the lubrication line........................................ 49
6.2 Positioning the RA pump ......................................................49
6.3 Installation ...............................................................................50
6.3.1 RA pump, rotary......................................................... 50
6.3.2 Multi-line pump unit in foot design, motor type IM
B34..........................................................................................50
6.3.3 Multi-line pump units with 3, 7, and 15 liter
reservoirs ...............................................................................50
6.3.4 Installing the electric lubricant level switches....... 50
6.3.5 Bleeding an RA pump for lubrication grease........ 51
6.3.6 Bleeding an RA pump for lubrication oil................ 51
6.3.7 Adjusting the delivery volume.................................. 52
6.4 Electrical connection .............................................................. 53
7. First start-up................................................................................. 54
7.1 Inspections before first start-up.......................................... 54
7.2 Inspections during first start-up..........................................54
8. Operation........................................................................................ 55
9. Maintenance and repair .............................................................. 56
9.1 Maintenance............................................................................ 56
10. Cleaning ....................................................................................... 57
10.1 Basics .....................................................................................57
10.2 Interior cleaning ...................................................................57
10.3 Exterior cleaning ..................................................................57
11. Faults, causes, and remedies................................................... 58
12. Repairs ......................................................................................... 59
13. Shutdown, disposal.................................................................... 60
13.1 Temporary shutdown..........................................................60
13.2 Permanent shutdown, disassembly ................................. 60
13.3 Disposal..................................................................................60

6
14. Spare parts ..................................................................................61
14.1 Pump elements and threaded rods ..................................61
14.2 Electric motors and reservoirs...........................................62
14.3 Drives and intermediate ring .............................................62
14.4 Pressure limiting valves and fittings.................................63
14.5 Fittings for pipes...................................................................63
15. Appendix.......................................................................................64
15.1 China RoHS Table ................................................................64

7
Safety alerts, visual
presentation, and layout
While reading these instructions, you will encounter various
symbols, illustrations, and text layouts intended to help you
navigate and understand the instructions. Their meaning is
explained below.
Safety alerts:
Activities that present specific hazards (to life and limb or
possible damage to property) are indicated by safety alerts.
Always be sure to follow the instructions given in the safety
alerts.
<
DANGER
These safety alerts indicate an imminent danger.
Ignoring them will result in death or serious injury
<
WARNING
These safety alerts indicate potentially imminent
danger. Ignoring them could result in death or
serious injury
<
CAUTION
These safety alerts indicate potentially imminent
danger. Ignoring them could result in minor injury
<
NOTICE
These safety alerts indicate a potentially harmful
situation. Ignoring them could result in damage to
property or malfunctions
Illustrations:
The illustrations used depict a specific product. For other
products, they may have the function of a diagram only. This
does not alter the basic workings and operation of the product.
Text layout:
•First-order bulleted lists: Items on a bulleted list start with
a solid black dot and an indent.
–Second-order bulleted lists: If there is a further listing of
subitems, the second-order bulleted list is used.
1 Legend: A legend explains the numbered contents of an
illustration, presented as a numbered list. Items in a legend
start with a number (with no dot) and an indent.
–Second-order legend: In some cases, the numbered
contents of an image represent more than just one object.
A second-order legend is then used.
1.Instruction steps: These indicate a chronological sequence
of instruction steps. The numbers of the steps are in bold and
are followed by a period. If a new activity follows, the
numbering starts again at “1.”
–Second-order instruction steps: In some cases, it is
necessary to divide up a step into a few substeps. A
sequence of second-order instruction steps is then used.

8
1. Safety instructions
1.1 General safety instructions
•Putting the products into operation or operating them without
having read the instructions is prohibited. The operator must
ensure that the instructions are read and understood by all
persons tasked with working on the product or who supervise
or instruct such persons. Retain the instructions for further
use.
•The product may only be used in awareness of the potential
dangers, in proper technical condition, and according to the
information in this manual.
•Any faults that could affect safety must be remedied
according to responsibility. The supervisor must be notified
immediately in case of malfunctions outside one's individual
scope of responsibility.
•Unauthorized modifications and changes can have an
unpredictable effect on safety and operation. Unauthorized
modifications and changes are therefore prohibited. Only
original SKF spare parts and SKF accessories may be used.
•Any unclear points regarding proper condition or correct
assembly/operation must be clarified. Operation is prohibited
until issues have been clarified.
•The components used must be suitable for the intended use
and the applicable operating conditions, e.g. max. operating
pressure and ambient temperature range, and must not be
subjected to torsion, shear, or bending.
1.2 General electrical safety instructions
•Electrical devices must be kept in proper condition. This must
be ensured by periodic inspections in accordance with the
relevant applicable standards and technical rules. The type,
frequency, and scope of the inspections must be determined
in accordance with the risk assessment to be carried out by
the operator. Work on electrical components may be
performed only by qualified electricians. Connect the electrical
power only in accordance with the valid terminal diagram and
in observance of the relevant regulations and the local
electrical supply conditions.
•Work on electrical components may be performed only in a
voltage-free state and using tools suitable for electrical work.
Do not touch cables or electrical components with wet or
moist hands.
•Fuses must not be bridged. Always replace defective fuses
with fuses of the same type.
•Ensure proper connection of the protective conductor for
products with protection class I. Observe the specified
enclosure rating.
•The operator must implement appropriate measures to
protect vulnerable electrical devices from the effects of
lightning during use. The electrical device is not furnished
with a grounding system for the dissipation of the respective
electric charge and does not have the voltage strength
necessary to withstand the effects of lightning.
1.3 General behaviour when handling the
product
•Familiarize yourself with the functions and operation of the
product. The specified assembly and operating steps and their
sequences must be observed.
•Keep unauthorized persons away.
•Wear personal protective equipment always.
•Precautionary operational measures and instructions for the
respective work must be observed.
•In addition to these Instructions, general statutory regulations
for accident prevention and environmental protection must be
observed.
•Precautionary operational measures and instructions for the
respective work must be observed. Uncertainty seriously
endangers safety.
•Safety-related protective and safety equipment must not be
removed, modified or affected otherwise in its function and is
to be checked at regular intervals for completeness and
function.
•If protective and safety equipment has to be dismantled, it
must be reassembled immediately after finishing the work,
and then checked for correct function.
•Remedy occurring faults in the frame of responsibilities.
Immediately inform your superior in the case of faults beyond
your competence.
•Never use parts of the centralized lubrication system or of the
machine as standing or climbing aids.
1.4 Intended use
Supply of lubricants.
The product is intended solely for installation in another
machine.
Use is only permitted within the scope of commercial or
economic activity by professional users, in compliance with the
specifications, technical data, and limits specified in this manual.
1.5 Persons authorized to use the
product
Operator
A person who is qualified by training, knowledge and experience
to carry out the functions and activities related to normal
operation. This includes avoiding possible hazards that may
arise during operation.
Specialist in electrics
Person with appropriate professional education, knowledge and
experience to detect and avoid the hazards that may arise from
electricity.
Specialist in mechanics
Person with appropriate professional education, knowledge and
experience to detect and avoid the hazards that may arise
during transport, installation, start-up, operation, maintenance,
repair and disassembly.

9
1.6 Foreseeable misuse
Any usage of the product other than as specified in this manual
is strictly prohibited. Particularly prohibited are:
•Use of non-specified consumables, contaminated lubricants,
or lubricants with air inclusions.
•Use of C3 versions in areas with aggressive, corrosive
substances (e.g., high salt load).
•Use of plastic parts in areas with high exposure to ozone, UV
light, or ionizing radiation.
•Use to supply, convey, or store hazardous substances and
mixtures as defined in the CLP Regulation (EC 1272/2008) or
GHS with acute oral, dermal, or inhalation toxicity or
substances and mixtures that are marked with hazard
pictograms GHS01-GHS06 and GHS08.
•Use to supply, convey, or store Group 1 fluids classified as
hazards as defined in the Pressure Equipment Directive
(2014/68/EU) Article 13 (1) a).
•Use to supply, convey, or store gases, liquefied gases,
dissolved gases, vapors, or fluids whose vapor pressure
exceeds normal atmospheric pressure (1013 mbar) by more
than 0.5 bar at their maximum permissible operating
temperature.
•Use in an explosion protection zone.
•Use without proper securing against excessively high
pressures, in the case of pressurized products.
•Use outside of the technical data and limits specified in this
manual.
1.7 Referenced documents
In addition to this manual, the following documents must be
observed by the respective target group:
•Company instructions and approval rules
If applicable:
•Safety data sheet of the lubricant used
•Project planning documents
•Supplementary information regarding special designs of the
pump. This you will find in the special system documentation.
•Instructions for other components for setting up the
centralized lubrication system.
1.8 Prohibition of certain activities
•Replacement of or modifications to the pistons of the pump
elements
•Repairs or modifications to the drive
1.9 Painting plastic components and
seals
The painting of any plastic components and seals of the
products described is prohibited. Completely mask or remove
plastic components before painting the main machine.
1.10 Safety markings on the product
No safety markings on the product
NOTE
In accordance with the results of the workstation risk
assessment, additional labels (e.g., warnings, safety signs,
prohibition signs, or labels in accordance with CLP/GHS) are
to be attached by the operator if necessary.

10
1.11 Note on the type plate
The type plate provides important data such as the type
designation, order number, and sometimes regulatory
characteristics. To avoid loss of this data in case the type plate
becomes illegible, it should be entered in the manual.
Fig. 1
Type plate for pumps with electric motor
Fig. 2
Type plate for pumps without electric motor
1.12 Notes on CE marking
CE marking is effected following the requirements
of the applied directives requiring a CE marking:
•2014/30/EC Electromagnetic Compatibility
•2011/65/EU Directive on the restriction of the use of certain
hazardous substances in electrical and electronic equipment
(RoHS II)
1.13 Note on Low Voltage Directive
The protection objectives of the Low Voltage Directive
2014/35/EU are met in accordance with Annex I, No. 1.5.1 of
the Machinery Directive 2006/42/EC.
1.14 Note on Pressure Equipment
Directive
Due to its performance characteristics, the product does not
reach the limit values defined in Article 4, Paragraph 1,
Subparagraph (a) (ii) and is excluded from the scope of Pressure
Equipment Directive 2014/68/EU in accordance with Article 1,
Paragraph 2 Subparagraph (f).
1.15 Note on UKCA marking
The UKCA conformity marking confirms the
product’s conformity with the applicable legal
provisions of Great Britain.
1.16 Note on EAC marking
The EAC conformity marking confirms the
product’s conformity with the applicable legal
provisions of the Eurasian customs union.
1.17 Note on China RoHS mark
The China RoHS mark confirms that there is no
danger to persons or the environment from the
regulated substances contained within for the
intended period of use (year number shown in the
circle).
1.18 Emergency shutdown
This is done by a course of action to be defined by the operator.
1.19 First start-up, daily start-up
Ensure that:
•All safety devices are fully present and functional
•All connections are properly connected
•All parts are correctly installed
•All warning labels on the product are fully present, visible, and
undamaged
•Illegible or missing warning labels are immediately replaced

11
1.20 Residual risks
Table 2
Residual risks
Residual risk
Possible in lifecycle
Avoidance / Remedy
Personal injury / property damage due
to falling of hoisted parts
A
B
C
G
H
K
•Unauthorized persons must be kept away.
•Personnel are not permitted to stand under hoisted
parts.
•Lift parts using suitable lifting gear.
Personal injury / property damage due
to tilting or falling product due to non-
compliance with specified torques
B
C
G
•Adhere to the specified torques.
•Mount the product only on components with a
sufficient load-carrying capacity.
•If no torques are specified, use those specified for the
screw size for screws of strength class 8.8.
Personal injury / property damage
caused by electric shock resulting from
power lead damage
B
C
D
E
F
G
H
•Inspect power cables for damage prior to initial use and
then at regular intervals.
•Do not install the cable on moving parts or wearing
spots. If this cannot be avoided, use anti-kink coils
and/or conduits.
Personal injury, property damage due to
spilled, leaked lubricant
B
C
D
F
G
H
K
•Be careful when filling the reservoir and then
connecting or disconnecting the lubricant lines.
•Use only hydraulic screw unions and lubrication lines
suitable for the specified pressure.
•
Do not install lubrication lines on moving parts or chafe
points. If this cannot be avoided, use anti-kink coils
and/or conduits.
Loss of electrical protective function due
to incorrect assembly of the electrical
components after a repair
G
•An electrical safety check in accordance with
EN 60204-
1 must be performed after the replacement
of electrical components.
Injury from operating the pump with the
hand crank attached
(pumps RA 2UB and RA 2M)
C
F
G
H
•After prelubrication, remove the hand crank from the
shaft again
.
Lifecycle phases: A = Transport, B = Assembly, C = First start-up, D = Operation, E = Cleaning, F = Maintenance, G = Malfunction, repair, H
= Shutdown, K = Disposal

12
2. Lubricants
2.1 General information
Lubricants are selected specifically for the relevant application.
The manufacturer or operator of the machine should ideally
make the selection in consultation with the supplier of the
lubricant. If you have no or little experience in selecting
lubricants for lubrication systems, please contact us. We would
be happy to assist you in selecting suitable lubricants and
components to build a lubrication system optimized for your
particular application. Consider the following points when
selecting/using lubricants. This will spare you potential
downtime and damage to the machine or lubrication system.
2.2 Material compatibility
The lubricants must generally be compatible with the following
materials:
•Plastics: ABS, CR, FPM, NBR, NR, PA, PET, PMMA, POM, PP,
PS, PTFE, PU, PUR
•Metals: steel, gray cast iron, brass, copper, aluminum
2.3 Temperature properties
The lubricant used must be suitable for the specific ambient
temperature of the product. The viscosity approved for proper
functioning must neither be exceeded at low temperatures nor
fall too low at high temperatures. For the approved viscosity,
see the “Technical data” chapter.
2.4 Aging of lubricants
Based on past experience with the lubricant used, checks should
be conducted at regular intervals defined by the operator, to
determine whether the lubricant needs to be replaced due to
aging processes (oil separation). In case of doubt regarding the
continued suitability of the lubricant, it must be replaced before
the system is started up again. If you do not yet have any
experience with the lubricant used, we recommend conducting
a check after just one week.
2.5 Avoidance of faults and hazards
To avoid faults and hazards, please observe the following:
•When handling lubricants, observe the relevant safety data
sheet (SDS) and any hazard labeling on the packaging.
•Due to the large number of additives, some lubricants that
meet the pumpability requirements specified in the manual
are not suitable for use in centralized lubrication systems.
•Whenever possible, always use SKF lubrication greases. They
are ideal for use in lubrication systems.
•Do not mix lubricants. This can have unpredictable effects on
the properties and usability of the lubricant.
•Use lubricants containing solid lubricants only after technical
consultation with SKF.
• The lubricant’s ignition temperature has to be at least
50 kelvin above the maximum surface temperature of the
components.
2.6 Solid lubricants
Solid lubricants may only be used after prior consultation with
SKF. When solid lubricants are used in lubrication systems, the
following rules generally apply:
Graphite:
•Maximum graphite content 8%
•Maximum grain size 25 µm (preferably in lamellar form)
MoS2:
•Maximum MoS2 content 5%
•Maximum grain size 15 µm
Copper:
•Lubricants containing copper are known to lead to coatings
forming on pistons, bore holes, and mating surfaces. This can
result in blockages in the centralized lubrication system.
Calcium carbonate:
•Lubricants containing calcium carbonate are known to lead to
very heavy wear on pistons, bore holes, and mating surfaces.
Calcium hydroxide:
•Lubricants containing calcium hydroxide are known to harden
considerably over time, which can lead to failure of the
centralized lubrication system.
PTFE, zinc, and aluminum:
•For these solid lubricants, it is not yet possible to define any
limit values for use in lubrication systems on the basis of
existing knowledge and practical experience.

13
3. Overview, functional
description
RA pumps are radial piston pumps constructed in a modular
design. The modular RA pumps can be equipped with up to 5
pump elements, with each pump element able to be operated
with 1, 2, or 4 outlets. The delivery rate of each pump element
can be adjusted with infinite variability. Together with the
various gear reduction ratios and motors, this allows them to be
adapted to any lubrication task. The RA pump can be operated
in both directions of rotation. In the following you will find an
overview of the most important versions and equipment
features of the pumps described in this manual.
CAUTION
Personal injury and/or property damage
The hand crank for prelubrication comes off the
shaft during operation, or
rotates freely on the
shaft.
After prelubrication, remove the hand crank from
the shaft. Operating the pump with the hand
crank is prohibited.
3.1 RA pump with rotary drive, coaxial
The pump has an initial section (2) with a shaft for the drive,
plus up to 5 pump elements (3) and a sealing cap (4) with tie-
rods (5).
Fig. 3
RA pump with rotary drive, coaxial
3.2 RA pump, rotary with coaxial gear
This pump has a coaxial gear (6) with 5 possible reduction
ratios, plus a possible hand crank (7) for prelubrication.
Fig. 4
RA pump with rotary drive and coaxial gear
3.3 RA pump, rotary with bevel gear
This pump has a bevel gear (8) with a reduction ratio of 10.5:1.
Fig. 5
RA pump, rotary with bevel gear
3.4 RA pump with electric motor, coaxial
This pump has an electric motor (9) and up to 5 pump
elements. A range of motors are available.
Fig. 6
RA pump with electric motor, coaxial
3.5 RA pump with electric motor and
coaxial gear
This pump has an electric motor, a coaxial gear (6) with 5
possible reduction ratios, and a possible hand crank for
prelubrication. A range of motors are available.
Fig. 7
RA pump with electric motor and coaxial gear

14
3.6 RA pump with electric motor and
bevel gear
This pump has an electric motor and a bevel gear (11) with a
reduction ratio of 10.5:1. A range of motors are available.
Fig. 8
RA pump with electric motor and bevel gear
3.7 RA pump with rotary drive, bevel
gear, and grease reservoir
This pump has a bevel gear (11) with a reduction ratio of
10.5:1, and a grease reservoir (12). The pump can be equipped
with up to 3 pump elements. Two reservoir sizes are available.
Fig. 9
RA pump, rotary with bevel gear and grease reservoir
3.7.1 RA pump with electric motor, coaxial
gear, and grease reservoir
This pump has an electric motor (9), a coaxial gear (6) with 5
possible reduction ratios, and a grease reservoir (12). The pump
can be equipped with up to 3 pump elements. Two reservoir
sizes and a range of motors are available.
Fig. 10
RA pump with electric motor, coaxial gear, and grease reservoir
3.8 RA pump with electric motor, bevel
gear, and grease reservoir
This pump has an electric motor (9), a bevel gear (11) with a
reduction ratio of 10.5:1, and a grease reservoir (12). The pump
can be equipped with up to 3 pump elements. Two reservoir
sizes and a range of motors are available.
Fig. 11
RA pump with electric motor, bevel gear, and grease reservoir

15
3.9 RA pump with electric motor, coaxial,
with oil reservoir
This pump has an electric motor (9) and an oil reservoir (13).
The pump can be equipped with up to 5 pump elements. Three
reservoir sizes and a range of motors are available.
Fig. 12
RA pump with electric motor, coaxial, with oil reservoir
3.10 RA pump with electric motor,
coaxial gear, and oil reservoir
This pump has an electric motor (9), a coaxial gear (6) with 5
possible reduction ratios, and an oil reservoir (13). The pump
can be equipped with up to 5 pump elements. Three reservoir
sizes and a range of motors are available.
Fig. 13
RA pump with electric motor, coaxial gear, and oil reservoir
3.10.1 RA pump with electric motor, bevel
gear, and oil reservoir
This pump has an electric motor (9) on a bevel gear (11) with 5
possible reduction ratios, and an oil reservoir (13). The pump
can be equipped with up to 5 pump elements. Three reservoir
sizes and a range of motors are available.
Fig. 14
RA pump with electric motor, bevel gear, and oil reservoir

16
3.11 Mode of operation
In the basic configuration, an RA pump consists of:
–The drive
–The intermediate ring
–An inlet
–At least one pump element with the outlets and a cap
The pump element is comprised of the pump ring (3), the pump
shaft (2) with the two radial pump pistons (4), and the track ring
with elliptical inner contour, which is permanently joined to the
adjusting plate (6).
The pump element (2) houses the suction grooves, the pressure
bores, and the outlets (11). The pump shaft drives the pump
elements via an embedded coupling.
Suction phase:
The two pump pistons are pressed against the inner side of the
track ring by the spring (5). As the pump shaft (4) turns, the two
pump pistons (7) move apart due to the spring loading, until the
outer dead center is reached. Until the outer dead center is
reached, the control bore in the pump shaft connects the space
between the two pump pistons to an inlet (8) in the
intermediate ring.
Pressure phase:
Due to the elliptically shaped track ring, the continued turning of
the pump shaft (4) pushes the pump pistons toward one
another, against the spring force, until the inner dead center is
reached. Until the inner dead center is reached, the control bore
in the pump shaft connects the space between the two pump
pistons to a lubricant outlet in the pump ring.
The delivery volume can be varied infinitely with the adjusting
plate (6), which causes the position of the track ring to change
relative to the position of the control bore in the pump shaft.
The stroke of the two pistons remains the same in each phase.
The stroke is either fully effective or partially effective,
depending on the setting.
Fig. 15
RA pump: how the pump elements work
1 Cap
2 Pump element
3 Pump ring
4 Pump shaft
5 Spring
6 Track ring / adjusting plate
7 Pump piston
8 Inlet
9 Cap nut with tie-rod
10 Pump element
11 Outlet
12 Intermediate ring
13 Drive

17
4. Technical data
4.1 RA pump with rotary drive, coaxial
Fig. 16
Dimensions
A = X + 20 mm | B = min. 100 mm | X = 125.5 mm with 1 pump element, up to 220.5 mm with 5 pump elements
I to IV indicate the positions of the outlet ports. These outlet ports are arranged at angles of 45°.
Table 3
General technical data
Ambient temperature
-15 °C to 80 °C
Mounting position
Any
Type
Radial piston pump
Sound pressure level
< 70 dB (A)
Operating pressure1)
63 bar
Drive speed
10 – 1500 rpm
Short-term pressure
100 bar
Direction of rotation2)
Clockwise or counterclockwise
Number of pump elements
Max. 5
Lubricant
Mineral oils
Outlets per pump element
1, 2 or 4
Lubricant temperature range
-15 °C to 80 °C
Varying the delivery volume
continuously variable
Operating viscosity
25 – 2500 mm2/s
Delivery volume per outlet 3)
max. 0.02 cm3
Suction head
500 mm
Intake tube inside diameter
≥ 4 mm
Weight of the pump
Number of pump elements
1
2
3
4
5
Weight
2.74 kg
1.59 kg
1.97 kg
2.36 kg
2.74 kg
1) Max. operating pressure: see delivery rate chart
2) Standard direction of rotation is clockwise
3) Per outlet and revolution

18
RA
1UA
00
/ 4421
R
0001
Type
RA = radial piston pump
Drive
1UA = rotary, coaxial
Gear reduction ratio
00 = 1:1
Number of outlets per pump element*
1 = 1 outlet
2 = 2 outlets
4 = 4 outlets
Direction of rotation
R = clockwise (standard direction of rotation)
L = counterclockwise
Design key
0001
*) Choice of 1 to 5 pump elements (counted from the drive outwards)

19
4.2 RA pump with rotary drive, coaxial gear
Fig. 17
Dimensions
A = X + 31 + 50 mm | Ø B = min. 100 mm (clearance for work) | Ø C = min. 250 mm (clearance with cap prelubrication)
I to IV indicate the positions of the outlet ports. These outlet ports are arranged at angles of 45°.
X = 125.5 mm with 1 pump element, up to 220.5 mm with 5 pump elements
Table 4
General technical data
Ambient temperature
-15 °C to 80 °C
Mounting position
Any
Type
Radial piston pump
Sound pressure level
< 70 dB (A)
Operating pressure1)
63 bar
Drive speed
Up to 3600 rpm
Short-term pressure
100 bar
Direction of rotation2)
Clockwise or counterclockwise
Number of pump elements
Max. 5
Lubricant
Mineral oils
Outlets per pump element
1, 2 or 4
Lubricant temperature range
-15 °C to 80 °C
Varying the delivery volume
continuously variable
Operating viscosity
25 – 2500 mm2/s
Delivery volume per outlet3)
max. 0.02 cm3
Suction head
500 mm
Inlets/outlets
G1/8"
Intake tube inside diameter
≥ 4 mm
Weight of the pump
Number of pump elements
1
2
3
4
5
Weight4)
2.24 kg
2.63 kg
3.01 kg
3.40 kg
3.78 kg
Gear reduction ratio, dimension a and
dimension b
Reduction ratio of coaxial gear
5:1
15:1
25:1
75:1
125:1
Dim. a
52.5
62.5
63.5
73.5
73
Dim. b
21
21
20.5
20.5
21
1) Max. operating pressure: see delivery rate chart
2) Standard direction of rotation is clockwise
3) Per outlet and revolution
4) Weight is increased by 0.1 kg with cap prelubrication. With cap prelubrication, the hand crank comes included.

20
RA
2UB
15
/ 4421
D
R
0001
Type
RA = radial piston pump
Drive
2UB = rotary with coaxial gear
Gear reduction ratio
05 = 5:1
15 = 15:1
25 = 25:1
75 = 75:1
13 = 125:1
Number of outlets per pump element*
1 = 1 outlet
2 = 2 outlets
4 = 4 outlets
Cap prelubrication
D = with (direction of rotation can only be clockwise)
/ = without
Direction of rotation
R = clockwise (standard direction of rotation)
L = counterclockwise
Design key
0001
*) Choice of 1 to 5 pump elements (counted from the drive outwards)