SKF OLA 1 Series User manual

Assembly Instructions
OLAx-1... Oil+Air lubrication unit
for lubrication of spindle bearings, linear guides, rack pinions, chains, and assembly processes
Created on: 05-05-2022
Document no.: 951-170-241-EN
Version: 01
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: OLAx-1... Oil+Air lubrication unit for lubrication of spindle bearings, linear guides, rack pinions, chains, and assembly processes
Type / item number: OLA / OLA..-..
Year of manufacture: See type plate
Furthermore, the following directives and standards were applied in the respective applicable areas:
2011/65/EU: RoHS II
2014/30/EU: Electromagnetic Compatibility
EN ISO 12100:2010 EN 60204-1:2018 EN 809+A1/AC:2010 EN IEC 63000:2018
EN IEC 61000-6-1:2019 EN IEC 61000-6-2:2019 EN IEC 61000-6-3:2007+A1:2011 EN IEC 61000-6-4:2019
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.
Berlin, 29.02.2016
Jürgen Kreutzkämper
Richard Lindemann
Manager, R&D
Germany
Manager, SE
Berlin
Manufacturer: SKF Lubrication Systems Germany GmbH, Motzener Strasse 35/37, 12277 Berlin, 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: OLAx-1... Oil+Air lubrication unit for lubrication of spindle bearings, linear guides, rack pinions, chains, and assembly processes
Type / item number: OLA / OLA..-..
Year of manufacture: See type plate
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 809+A1/AC:2010 EN IEC 63000:2018
EN IEC 61000-6-1:2019 EN IEC 61000-6-2:2019 EN IEC 61000-6-3:2007+A1:2011 EN IEC 61000-6-4:2019
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.
Berlin, 29.02.2016
Jürgen Kreutzkämper
Richard Lindemann
Manager, R&D
Germany
Manager, SE
Berlin
Manufacturer: SKF Lubrication Systems Germany GmbH, Motzener Strasse 35/37, 12277 Berlin, 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
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
Y
es
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
Y
es
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
Y
es
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
Y
es
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
Y
es
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.
2) The integrator must ensure that the pump is integrated into the machine in such a way that it can be filled and operated ergonomically.
3) The operator must protect the system against excessive pressure. For this purpose, the system must be provided with a pressure
limiting valve with suitable opening pressure
4) Not relevant to the partly completed machinery.
5) The integrator must ensure that the pump is integrated into the machine in such a way that it can be operated without danger.

4
Masthead
Manufacturer
SKF Lubrication Systems Germany GmbH
Email: [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
Original EC Declaration of Incorporation in accordance with
Directive 2006/42/EC, Appendix II Part 1 B..................... 2
Original UK Declaration of incorporation according to the Supply
of Machinery (Safety) Regulations 2008 No. 1597 Annex
II .............................................................................................. 2
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..........................................................9
1.12 Notes on CE marking ...........................................................9
1.13 Note on Low Voltage Directive ........................................ 10
1.14 Note on UKCA marking ..................................................... 10
1.15 Note on EAC marking........................................................ 10
1.16 Note on China RoHS mark ............................................... 10
1.17 Emergency shutdown........................................................ 10
1.18 Assembly, maintenance, fault, repair.............................. 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 characteristics............................................... 12
2.4 Ageing of lubricants ............................................................. 12
2.5 Avoidance of malfunctions and hazards ........................... 12
3. Overview, functional description ...............................................13
3.1 Overview................................................................................ 13
3.2 General .................................................................................. 14
3.3 How Oil+Air lubrication works ............................................ 14
3.4 Fields of application ............................................................. 14
3.5 Design.................................................................................... 14
3.6 Functional description ......................................................... 15
3.6.1 Hydraulic diagram of an Oil+Air lubrication unit.. 16
3.7 Description of components ................................................. 17
3.7.1 Gear pump unit......................................................... 17
3.7.2 Compressed air regulating valve............................ 17
3.7.3 Pressure switch for minimum air pressure.......... 18
3.7.4 Oil+Air mixing valve with metering........................ 18
4. Technical data..............................................................................20
4.1 Type identification code....................................................... 22
5. Delivery, returns, storage...........................................................24
5.1 Delivery.................................................................................. 24
5.2 Return shipment .................................................................. 24
5.3 Storage .................................................................................. 24
5.4 Storage temperature range................................................ 24
5.5 Storage conditions for products filled with lubricant ...... 24
5.5.1 Storage period up to 6 months.............................. 24
5.5.2 Storage period between 6 and 18 months .......... 24
5.5.3 Storage period more than 18 months .................. 24
6. Assembly.......................................................................................25
6.1 General .................................................................................. 25
6.2 Setup and attachment......................................................... 25
6.3 Assembly drawing with minimum mounting dimensions26
6.3.1 Minimum mounting dimensions ............................ 26
6.3.2 Attachment of an Oil+Air lubrication unit ............. 27
6.4 Electrical connection ............................................................ 28
6.4.1 Electric motor connection ....................................... 28
6.4.2 Oil dirt indicator switch............................................ 29
6.4.3 Pressure switch for minimum air pressure (DL) . 29
6.4.4 3/2 directional control valve for switching
compressed air on and off................................................. 30
6.4.5 Inductive loads .......................................................... 30
6.5 Control and monitoring ....................................................... 30
6.5.1 Oil+Air lubrication unit without control unit ......... 30
6.5.2 Terminal diagram 230/115 VAC without control
unit........................................................................................ 31
6.5.3 Terminal diagram 24 VDC without control unit .. 32
6.5.4 Oil+Air lubrication unit with control unit............... 33
6.5.5 Terminal diagram 230/115 VAC with control unit
.............................................................................................. 34
6.5.6 Terminal diagram 24 VDC with control unit ........ 35
6.6 Air supply line connection ................................................... 36
6.7 Lubrication line connection................................................. 37
6.8 Bleeding the Oil+Air mixing valve MV20x......................... 38
6.8.1 Bleeding the main oil channel ................................ 38
6.8.2 Bleeding the oil outlets............................................ 39
6.8.3 Bleeding the metering mechanisms...................... 40
6.9 General information on lubrication line routing............... 40
7. First start-up................................................................................41
7.1.1 Setting up.................................................................. 42
8. Operation......................................................................................43
8.1 General .................................................................................. 43
8.1.1 Oils permitted ........................................................... 43
8.2 Feed of lubricant to the bearing......................................... 43
8.3 Setting the lubricant flow rate............................................ 44
8.4 Adjusting the air flow rate................................................... 46
8.4.1 Air flow rate in Nl/min ............................................. 47
8.5 Changing metering on MV20x-1.. ..................................... 48
8.6 General notes........................................................................ 48
9. Maintenance and repair .............................................................50
9.1 General .................................................................................. 50
9.2 Maintenance and repair ...................................................... 50
9.3 Cleaning the compressed air filter ..................................... 51
9.4 Cleaning the oil filter............................................................ 51
10. Cleaning......................................................................................52
10.1 Basics................................................................................... 52
10.2 Interior cleaning................................................................. 52
10.3 Exterior cleaning ................................................................ 52
11. Faults, causes, and remedies ..................................................53
11.1 General................................................................................ 53
11.2 Malfunctions and their resolution.................................... 53
12. Repairs........................................................................................55
13. Shutdown, disposal...................................................................55

6
13.1 Temporary shutdown ........................................................ 55
13.2 Permanent shutdown, disassembly ................................ 55
13.3 Disposal ............................................................................... 55
14. Spare parts................................................................................ 56
14.1 General ................................................................................ 56
14.2 MKX gear pump unit.......................................................... 58
14.3 Accessories.......................................................................... 59
15. Appendix.................................................................................... 68
15.1 China RoHS Table .............................................................. 68

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.
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 Oil+Air lubrication unit
Fig. 2
Type plate for gear pump unit
Legend to Figures 1 and 2:
1 Type designation
2 Serial number
1.12 Notes on CE marking
CE marking is effected following the requirements
of the applied directives requiring a CE marking:
•2006/42/EG Machinery Directive
•2014/30/EC Electromagnetic Compatibility

10
•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 UKCA marking
The UKCA conformity marking confirms the
product’s conformity with the applicable legal
provisions of Great Britain.
1.15 Note on EAC marking
The EAC conformity marking confirms the
product’s conformity with the applicable legal
provisions of the Eurasian customs union.
1.16 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).
1.17 Emergency shutdown
This is done by a course of action to be defined by the operator.
1.18 Assembly, maintenance, fault,
repair
Prior to the start of this work, all relevant persons must be
notified of it. At a minimum, the following safety measures must
be taken before any work is done:
•Unauthorized persons must be kept away
•Mark and secure the work area
•Cover adjacent live parts
•Dry any wet, slippery surfaces or cover them appropriately
•Cover hot or cold surfaces appropriately
Where applicable:
•Depressurize
•Isolate, lock and tag out
•Check to ensure live voltage is no longer present
•Ground and short-circuit
The product should be protected as much as possible from
humidity, dust, and vibration, and should be installed so that it is
easily accessible. Ensure an adequate distance from sources of
heat or cold. Any visual monitoring devices present, such as
pressure gauges, min./max. markings, or oil level gauges must
be clearly visible. Observe the mounting position requirements.
Drill required holes only on non-critical, non-load-bearing
parts of the operator's infrastructure. Use existing holes where
possible. Avoid chafe points. Immobilize any moving or detached
parts during the work. Adhere to the specified torques.
If guards or safety devices need to be removed, they must be
reinstalled immediately following conclusion of work and then
checked for proper function.
Check new parts for compliance with the intended use before
using them.
Avoid mixing up or incorrectly assembling disassembled parts.
Label parts. Clean any dirty parts.
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
Lubricant reservoir of the gear pump
unit overflowing due to overfilling
B •Perform filling of the lubricant reservoir carefully and
stop once the “MAX” mark on the lubricant reservoir is
reached
Risk of slipping due to contamination of
floor by spilled or leaked lubricant
B C D E F G H K •Exercise caution when filling and when closing the filler
neck cap
•Promptly apply suitable binding agents and remove the
leaked or spilled lubricant
•Follow statutory and company regulations for the
handling of lubricants
Tearing/damage to supply, compressed
air, and lubricant lines when installed on
moving machine components.
B •If possible, do not install on moving machine parts. Use
flexible supply, compressed air, and lubricant lines
Lubricant spraying out due to faulty
installation of fittings/threaded joints on
lubricant lines
D •Tighten all fittings/threaded joints with the appropriate
torques. Use fittings/threaded joints and lubricant lines
suitable for the indicated operating pressures. Check all
fittings/threaded joints and lubricant lines for correct
connection and damage before first start-up
Risk of burns from hot surfaces of a
motor
F G •Before removing the cap of the gear pump unit,
disconnect the Oil+Air lubrication unit from the supply
voltage. Motor surfaces may only be touched with
appropriate gloves or after the motor has been shut off
for an extended time.
Heating of the motor due to jamming of
the motor
G •Before removing the cap of the gear pump unit,
disconnect the Oil+Air lubrication unit from the supply
voltage. Allow the motor of the gear pump unit to cool
down and remedy the cause
Electric shock (AC voltage design) F •Before any maintenance work, disconnect the Oil+Air
lubrication unit from the supply voltage
Contamination of the environment with
lubricant and components that have
come into contact with lubricant
H K Properly dispose of lubricants and components that have
come into contact with lubricants. Follow the statutory
and company regulations for the handling of lubricants.
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 respective application.
The selection is made by the manufacturer or operator of the
machine, preferably together with the lubricant supplier. Should
you have little or no experience with the selection of lubricants
for lubrication systems, please contact us. We will be pleased to
support you in the selection of suitable lubricants and
components for the construction of a lubrication system
optimized for the respective application. Please observe the
following points when selecting/using lubricants. You will avoid
possible downtimes and damages to your machine or the
lubrication system.
2.2 Material compatibility
Lubricants must generally be compatible with the following
materials:
•Plastics: ABS, CR, FPM, NBR, NR, PA, PET, PMMA, POM, PP,
PS, PTFE, PU, PUR
Metal steel, grey iron, brass, copper, aluminium
2.3 Temperature characteristics
The lubricant used must be suitable for the specific ambient
temperature of the product. The viscosity required for proper
operation of the product must not be exceeded in case of low
temperatures nor fall below specification in case of high
temperatures. Specified viscosity, see chapter Technical data.
2.4 Ageing of lubricants
Depending on the experience with the lubricant used, it should
be checked at regular intervals to be determined by the
operator whether the lubricant needs to be replaced due to
ageing processes (bleeding). If there is any doubt as to the
further suitability of the lubricant, it must be replaced before
recommissioning. If you have no experience with the lubricant
used, we recommend testing after only one week.
2.5 Avoidance of malfunctions and
hazards
To avoid malfunctions or hazards, please observe the following:
•When handling lubricants, observe the relevant safety data
sheets (SDS) and hazard designations on the packaging, if
any.
•Due to the large number of additives, individual lubricants
which meet the requirements for pumpability specified in the
instructions may not be suitable for use in centralized
lubrication systems.
•Always use SKF lubrication greases, if possible. These are
optimally suited for use in lubrication systems.
•Do not mix lubricants. This may have unforeseeable effects on
the characteristics and on the usability of the lubricant.
•The ignition temperature of the lubricant must lie at least
50 K over the maximum surface temperature of the
components.

13
3. Overview, functional
description
3.1 Overview
Fig. 3
Maximum configuration of the Oil+Air lubrication unit
Legend to Figure 3:
1 Gear pump unit without control unit (optionally with control
unit)
2 Filler neck
3 Pressure gauge for oil pressure 4 Dirt indicator for oil filter (visual/electrical)
5 Oil filter housing with oil filter 6 Pressure switch for minimum air pressure
7 Compressed air regulating valve 8 Pressure gauge for the air pressure of the compressed air
supply
9 Compressed air port 10 Compressed air filter and water separator
11 3/2 directional control valve 12 Oil+Air mixing valve with metering
13 Lubricant reservoir

14
3.2 General
SKF Oil+Air lubrication units are total loss lubrication systems
which are used in centralized lubrication for minimal quantity
lubrication of oils. Oil+Air lubrication units are employed in a
wide range of areas of application. A few areas of application for
Oil+Air Lubrication units are:
•Rolling bearing lubrication
•Linear guide lubrication
•Chain lubrication
•Rack and pinion lubrication
•Lubrication for both chip-making and chipless machining
methods
•Assembly and process oiling
3.3 How Oil+Air lubrication works
Oil+Air lubrication involves a metered volume of oil being drawn
into streaks in a lubrication line by a continuous air flow
(compressed air) and transported in the direction of the
compressed air flow along the tube wall and to the lubrication
point. The metering can be done in a number of ways, including
by piston metering devices, injection oilers, micropumps, or an
Oil+Air mixing valve with metering.
The metered volume of oil is supplied to the air flow in pulses,
and is transported by the air flow into the connected feed line.
The feed line between the metering device and the inlet to the
lubrication point, which is at least 1 m long, creates a nearly
continuous, finely metered flow of oil and supplies it to the
lubrication point. The lubricant supplied to the lubrication point
lubricates the friction partners, while the supplied compressed
air is discharged into the environment virtually oil-free.
3.4 Fields of application
Oil+Air lubrication units supply a continuous, finely metered oil
flow, which can be adapted to different operating conditions by
changing the metered volume, the flow velocity of the
compressed air, and the sequence of lubrication pulses. A prime
application of Oil+Air lubrication is the lubrication of high-speed
rolling bearings, such as in spindles for machine tools.
Additional applications include the lubrication of conveyor
chains, where a cyclical lubricant feed is not possible due to the
speed of the conveyor chain rotation.
In production processes for textile fibers, an Oil+Air lubrication
unit can be used to apply extremely small lubricant volumes (for
gripper lubrication).
3.5 Design
Fig. 4
Oil+Air lubrication unit
Legend to Figure 4:
1 Gear pump unit without control unit / pressure limiting valve /
pressure-relief and residual-pressure valve / oil pressure
switch (for required oil pressure)
2 Filler neck
3 Pressure gauge for oil pressure
4 Oil filter housing with oil filter / dirt indicator for oil filter,
visual/electrical
5 Pressure switch for minimum air pressure
6 Compressed air regulating valve
7 Compressed air port
8 Pressure gauge for the air pressure of the compressed air
supply
9 Air filter and water dispersion filter
10 3/2 directional control valve
11 Oil-streak sensor
12 Nozzle
13 Hose coil
14 Oil+Air mixing valve / metering device / air regulating valve
15 Gear pump with motor
16 Level switch
17 Lubricant reservoir
An Oil+Air lubrication unit can essentially be divided into
sections for lubricant supply/lubricant metering, and for
compressed air supply. The metering of the lubricant and the
mixing of it with compressed air can be done either by an
Oil+Air mixing valve with metering (metering of the lubricant
and mixing of the compressed air in a single component) or with
the aid of separate mixing valves combined with piston metering
devices, injection oilers, or micropumps. In that case, the
metering of the lubricant and the mixing of it with compressed
air are done by separate components.

15
In the maximum configuration, an Oil+Air lubrication unit is
comprised of the following components; see also section 3.6.1
Hydraulic diagram of an Oil+Air lubrication unit:
•Gear pump unit with or without a control unit (image shows a
design without a control unit) with gear pump and electric
motor (Fig. 4/1), lubricant reservoir (Fig. 4/17), with the set of
valves required for pressure relief and pressure limitation, an
oil pressure switch for electrical monitoring of the pressure
build-up in the lubricant, a pressure gauge (Fig. 4/3) for visual
monitoring of the pressure build-up in the lubricant, and a
lubricant level switch to monitor the lubricant level
•Compressed air regulating valve (Fig. 4/6) with pressure
gauge (Fig. 4/8) to regulate the compressed air, water
separator with air filter (Fig. 4/9)
•Pressure switch (Fig. 4/5) to monitor the minimum air
pressure
•Oil+Air mixing valve with metering (Fig. 4/14) for metering of
the lubricant and mixing with the compressed air
•3/2 directional control valve (Fig. 4/10) for opening and
closing the flow of compressed air
•Oil filter (Fig. 4/4) with or without electrical/visual dirt
monitoring (Fig. 4/4)
In the basic configuration, the components are arranged on a
mounting plate and are delivered as a complete Oil+Air
lubrication unit.
If required, other components can be integrated optionally into
the Oil+Air lubrication unit, such as:
•Additional pressure switches to monitor the lubricant and
compressed air
•Oil-streak sensors to monitor the conveying of the lubricant
(as an oil streak) into the feed lines
3.6 Functional description
The following describes a lubrication cycle of an Oil+Air
lubrication unit comprised of a gear pump unit and an Oil+Air
mixing valve with metering; see section 3.6.1 Hydraulic diagram
of an Oil+Air lubrication unit.
When the electric motor is switched on, the lubricant is drawn
out of the lubricant reservoir by the gear pump and fed through
the main lubricant line, via the pressure relief valve and the
pressure limiting valve, to the Oil+Air mixing valve, either
directly or via the oil filter. The built-up oil pressure causes the
lubricant in the Oil+Air mixing valve to be metered separately
for each lubrication point. The compressed air supplied to the
Oil+Air mixing valve conveys the metered volume of lubricant
out of the mixing valve into the feed line and onward to the
lubrication point. The air flow draws the lubricant out into a
streak and conveys it along the tube wall toward the lubrication
point.
The bearing is thus continuously supplied with a minimum flow
of lubricant and air. The air flow introduced creates
overpressure in the bearing assembly and prevents the ingress
of contaminants. The compressed air leaves the lubrication
point nearly free of oil.
When the electric motor is switched off, the pressure is
relieved in the main lubricant line. In this process, the lubricant
is moved from the spring chamber of the Oil+Air mixing valve
into the lubrication chamber.
After the interval time, the Oil+Air lubrication unit is again
ready for the next operating time.
To ensure perfect metering, it is recommended to set a delay
time for the gear pump on the control unit or the machine
control. The pump delay time is the period during which the
gear pump motor continues to run after the working pressure is
reached in the main lubricant line, in order to ensure that the
lubrication chambers in the Oil+Air mixing valve are emptied
completely. 5 seconds is recommended. Other delay times are
possible depending on the layout of the Oil+Air lubrication
system. The working pressure built up during an operating time
is monitored by the electric oil pressure switch installed in the
gear pump unit, and also visually using a pressure gauge if one
is installed on the gear pump unit. The signal from the oil
pressure switch is processed either directly by the machine
control (in the case of a gear pump unit without control unit) or
by the electronic control unit (gear pump unit with control unit).
An Oil+Air lubrication unit runs in cycles, which means each
operating time is always followed by an interval time. The length
of the set interval time is directly dependent on the lubricant
requirement of the lubrication point.
A lubrication cycle consists of the operating time and the
interval time. Note that the electric motor of the gear pump unit
is approved for duty type S3 (periodic duty) and the minimum
interval times and maximum motor running times must be
observed during operation; see also section 8.3 Setting the
lubricant flow rate.
The interval time is controlled either directly by the machine
control (in the case of a gear pump unit without control unit) or
by the electronic control unit (gear pump unit with control unit).
The fill level in the lubricant reservoir is monitored by a level
switch installed in the gear pump unit. The signal from the
lubricant level switch is processed either directly by the machine
control (in the case of a gear pump unit without control unit) or
by the electronic control unit (gear pump unit with control unit).
The minimum air pressure set on the compressed air
regulating valve is monitored by a pressure switch. The signal
from the pressure switch is processed either directly by the
machine control (in the case of a gear pump unit without control
unit) or by the electronic control unit (gear pump unit with
control unit).

16
3.6.1 Hydraulic diagram of an Oil+Air lubrication unit
Fig. 5
Oil+Air hydraulic diagram
Legend to Figure 5:
1 Filler neck 2 Level switch
3 Gear pump unit without control unit 4 Gear pump with motor
5 Pressure limiting valve 6 Pressure-relief and residual-pressure valve
7 Oil pressure switch (for the required oil pressure) 8 Pressure gauge for oil pressure
9 Oil filter housing with oil filter / dirt indicator for oil filter,
visual/electrical
10 Lubricant metering device
11 Oil+Air mixing valve 12 Hose coil
13 Oil-streak sensor 14 Nozzle
15 Air regulating valve 16 3/2 directional control valve
17 Pressure switch for minimum air pressure 18 Additional air filter
19 Pressure gauge for the air pressure of the compressed air
supply
20 Compressed air regulating valve
21 Air filter and water dispersion filter 22 Compressed air port
23 Control light 24 Control and monitoring
A Oil pulses (metered) B Compressed air (continuous)
C Oil streaks on the pipe walls (wall flow)

17
3.7 Description of components
The following sections describe the individual
components:
•Gear pump unit with/without control unit
•Compressed air regulating valve
•Pressure switch for minimum air pressure
3.7.1 Gear pump unit
Fig. 6
Oil+Air lubrication unit
Legend to Figure 6:
1 Gear pump unit
2 Lubricant reservoir
3 Pressure gauge
The gear pump unit (Fig. 6/1) consists of the gear pump and an
electric motor, the lubricant reservoir (Fig. 6/2), the set of valves
required for pressure relief and pressure limitation, an oil
pressure switch for electrical monitoring of the pressure build-
up in the main lubricant line and a pressure gauge for visual
monitoring of it (Fig. 6/3), and a level switch to monitor the
lubricant level.
Gear pump units are available in model designs with or
without a control unit. In the model design without a control
unit, the gear pump unit (and thus the lubrication cycle) is
controlled by the control unit of the machine that the Oil+Air
lubrication unit is mounted on. In the model design with a
control unit, the gear pump unit is equipped with an electronic
control unit that controls the gear pump unit (and thus the
lubrication cycle).
Details on the function and operation of the gear pump unit and
the electronic control unit can be found in the assembly
instructions for the gear pump unit and the operating
instructions for the electronic control unit which are included in
delivery of the Oil+Air lubrication unit.
3.7.2 Compressed air regulating valve
Fig. 7
Oil+Air lubrication unit
Legend to Figure 7:
1 Compressed air regulating valve
2 Pressure gauge
3 Water separator
4 Oil+Air mixing valve
5 LRS air adjustment screws
The compressed air regulating valve (Fig. 7/1) is used to set the
air pressure of the compressed air supplied to the Oil+Air mixing
valve and the feed line. The compressed air is used to transport
the oil streak along the inner wall of the feed line, from the
Oil+Air mixing valve (Fig. 7/4) through to the lubrication point. It
is important to ensure uniform supply of the compressed air in
order to ensure constant transport of the oil streak and
consequently constant supply of lubricant to the lubrication
point.
The air pressure is set manually. The set air pressure can be
read directly on the pressure gauge (Fig. 7/2) built into the
compressed air regulating valve (Fig. 7/1).
Optionally an air filter with an integrated water separator
(Fig. 7/3) can be used.

18
3.7.3 Pressure switch for minimum air
pressure
Fig. 8
Oil+Air lubrication unit
Legend to Figure 8:
1 Pressure switch
The pressure switch for the minimum air pressure (Fig. 8/1)
continuously monitors the air pressure set on the compressed
air regulating valve. As soon as the air pressure set on the
compressed air regulating valve falls below the minimum value
set on the pressure switch, an electrical signal is output by the
pressure switch. This signal can be processed as a fault signal
by the machine control or by the control unit of the gear pump
unit.
It is necessary to monitor the minimum air pressure because
there is a risk of underlubrication of the lubrication point if the
compressed air supply is too low, because the lubricant can no
longer be transported reliably to the lubrication point through
the feed lines.
3.7.4 Oil+Air mixing valve with metering
Fig. 9
Oil+Air lubrication unit
Legend to Figure 9:
1 Oil+Air mixing valve MV20x
An MV20x Oil+Air mixing valve (Fig. 9/1) consists of a valve
block in compact design with up to 8 lubrication line connections
that are designed for metered volumes between 10 mm³and
160 mm³(in six increments).
If more lubrication line connections are required, more Oil+Air
mixing valves can be connected in series. In the Oil+Air mixing
valve, the lubricant is metered separately for each lubrication
point and conveyed to the lubrication point by the air flow in the
feed line.
The air adjustment screws (LRS) in the Oil+Air mixing valves
can be used to adjust the required air flow separately for each
lubrication point.

19
3.7.4.1 Illustration of the Oil+Air mixing valve with
metering
Fig. 10
MV20x mixing valve with metering
Legend to Figure 10:
1 Oil+Air mixing valve with metering
2 Connection for feed lines
3 Plug screws for the oil metering mechanisms
4 Connection for the main lubricant line (right and left)
5 Connection for the air supply line (right and left)
6 Air adjustment screws (LRS)
7 Pressure measurement port (M5 thread)

20
4. Technical data
Table 3
T
echnical data
Designation Unit
V
alue
Mounting position
V
ertical
A
mbient temperature
°
C
+
10 to + 40
Enclosure rating IP54
Oil+Air lubrication unit
Dimensions W x H x D with mounting plate
m
m Depends on the design (see documentation)
W
eight (filled) kg Depends on the design (see documentation)
Number of lubrication point connections - 1 ... 8 (> 8 on request)
Gear pump unit
Delivery rate 1) l/min
0
.2
Rated capacity of lubricant reservoi
r
liters
3
(2 and 6 on request)
Material of lubricant reservoir - Polyamide (PA6)
Max. operating pressure
b
ar
3
0
Pressure-relief valve - Included
Pumped medium - Mineral or synthetic oil, compatible with NBR elastomers
Permiss. oil viscosity
m
m2/s (cSt) 20 to 1500
Motor Capacitor motor DC moto
r
Rated voltage
V
1
15 V AC 230 V AC 24 V DC
Rated frequency Hz 50 / 60 50 / 60
Rated current
A
1
.06 / 1.36
0
.53 / 0.68
1
.6
Rated capacity
W
60
7
5
3
9
Duty type (per VDE 0530) -
S
tandard design: S3, 20% duty cycle (1.25 ... 25 min) (e.g., with
1
.25 min
c
ycle time, the pump run time is 15 s, and the interval time is 1 min)
T
hermal switch - Built-in
Oil+Air mixing valve with metering
Number of lubrication point connections per
Oil+Air mixing valve with metering
•Series MV20x-x.. -
1
... 8
•Metering of Oil+Air mixing valve with metering
•Series MV20
m
m3
1
0, 20, 30, 60, 100, 160
Oil+Air outlet, feed line - M8x1, counterbore for solderless union for tube Ø 4 mm
Oil connection - M10x1, counterbore for solderless union for tube Ø 6 mm
Compressed air connection - M10x1, counterbore for solderless union for tube Ø 6 mm
W
orking pressure
b
ar
3
... 10, ideally 6 bar
A
ir consumption (for feed line with internal
diameter of 2.3 mm, ISO VG 32...100 oil)
Nl/h
1
000 ... 1500
Oil pressure switch (included in the gear pump
unit)
Function - NC contact (opens when oil level is too low - at min)
Switching voltage range
V
1
0 to 25 AC / 10 to 36 DC
Switched current (resistive load)
A
≤ 0.25
Switching capacity (resistive load)
W
/ VA ≤ 3
Nominal pressure
b
ar NC contact (opens when oil level is too low - at min)
Pressure switch for minimum air pressure
(DL)
Switching pressure
b
ar
0
.3 to 5; set: 3
Max. switching voltage
V
(AC) 250