SKF MKU Series User manual

EN
for oil and fluid grease for use in SKF MonoFlex
single-line and oil+air centralized lubrication systems
Gear Pump Units of
Product Series MKU, MKF, MKL
Version 04
Assembly instructions acc. to EC Dir. 2006/42/EC
for partly completed machinery, with associated operating instructions

2
EN EC Declaration of Incorporation
EC Declaration of Incorporation according to Machinery Directive 2006/42/EC, Annex II Part 1 B
The manufacturer SKF Lubrication Systems Germany GmbH , Berlin Motzener Strasse 35/37, DE - 12277 Berlin hereby declares that the partly completed
machinery:
Designation: Gear Pump Unit with reservoir
Type: MKU (F) (L) 1 (2) (5)-... ; MKU11-...
Part no.: MKU (F) (L) 1 (2) (5)-... ; MKU11-...
Year of construction: See type identification plate
complies with the following basic requirements of the EC Machinery Directive 2006/42/EC at the time when first being launched in the market.
1.1.2 · 1.1.3 · 1.3.2 · 1.3.4 · 1.5.1 · 1.5.6· 1.5.8 · 1.5.9 · 1.6.1 · 1.7.1 · 1.7.3 · 1.7.4
The special technical documents were prepared following annex VII part B of this directive. Upon justifiable request, these special technical documents can be
forwarded electronically to the respective national authorities. The person empowered to assemble the technical documentation on behalf of the
manufacturer is the head of standardization; see manufacturer‘s address.
Furthermore, the following directives and harmonized standards were applied in the respective applicable areas:
2011/65/EU RoHS II
2014/30/EU Electromagnetic compatibility | Industry
Standard Edition Standard Edition Standard Edition Standard Edition
DIN EN ISO 12100 2011 DIN EN 60947-5-1 2010 DIN EN 61000-6-2 2006 DIN EN 61000-6-4 2011
DIN EN 809 2012 DIN EN 61131-2 2008 Amendment 2011 DIN EN 60947-5-1 2010
DIN EN 60204-1 2007 Amendment 2009 DIN EN 61000-6-3 2011
Amendment 2010 DIN EN 60034-1 2015 Amendment 2012
DIN EN 50581 2013 DIN EN 61000-6-1 2007
The partly completed machinery must not be put into service until the final machinery into which it is to be incorporated has been declared in conformity with
the provisions of the EC Machinery Directive 2006/42/EC and any other applicable directives.
Berlin 2015/20/04
Jürgen Kreutzkämper
Manager R&D Germany
SKF Lubrication Business Unit
Richard Lindemann
Manager Sustain Engineering Berlin
Lubrication Business Unit

3
Masthead
Masthead
These assembly instructions pursuant to
EC Machinery Directive 2006/42/EC are an
integral part of the product described here
and must be kept for future use.
Warranty
The instructions do not contain any infor-
mation on the warranty. This can be found
in the General Conditions of Sale, which are
available at:
www.skf.com/lubrication.
Copyright / Integration of instructions
© SKF Lubrication Systems Germany GmbH
All rights reserved
These instructions are protected by copy-
right.
The use of its contents for the purpose of
integration into the documentation of the
machine manufacturer in whose product it
will be integrated is expressly allowed. This
also includes the preparation of training
documents for internal, non-commercial
purposes. Any other usage of any kind wi-
thout written permission of the rights hol-
der is prohibited and constitutes a violation
of copyright.
EN
Manufacturer and service address
If you have technical questions, please
contact:
SKF Lubrication Systems Germany GmbH
Berlin Plant
Motzener Strasse 35/37
12277 Berlin
Germany
Tel. [phone]
Fax [phone]
www.skf.com/lubrication
Hockenheim Plant
2. Industriestrasse 4
68766 Hockenheim
Germany
Tel. [phone]
Fax [phone]
www.skf.com/lubrication

4
EN
Table of contents
Table of contents
Assembly instructions
Assembly instructions acc. to EC Dir. 2006/42/EC
for partly completed machinery, with associated
operating instructions 1
EC Declaration of Incorporation 2
Explanation of symbols and signs 7
1. Safety instructions 9
1.1 General safety instructions 9
1.2 General behavior when handling
the product 9
1.3 Qualified technical personnel 10
1.4 Electric shock hazard 11
1.5 System pressure or hydraulic
pressure hazard 11
1.6 Operation 11
1.7 Assembly/maintenance/malfunction/
decommissioning/disposal 12
1.8 Intended use 12
1.9 Foreseeable misuse 13
1.10 Disclaimer of liability 13
1.11 Referenced documents 14
1.12 Warning labels on the product 14
1.13 Residual risks 15
2. Lubricants 17
2.1 General information 17
2.2 Selection of lubricants 17
2.3 Approved lubricants 18
2.4 Lubricants and the environment 19
2.5 Lubricant hazards 19
3. Overview 20
3.1 Description of designs 20
3.2 Equipment of a MKx gear pump unit 21
Order code
3.3 MKU gear pump units 22
3.4 MKF gear pump units 24
3.5 MKL gear pump units 26
4. Assembly 27
4.1 General information 27
4.2 Setup and attachment 27
4.2.1 Minimum mounting dimensions 28
4.3 Assembly drawing with minimum
installation dimensions 29
4.3.1 MKU/MKF gear pump units with
2-liter plastic reservoir for oil and
fluid grease 29
4.3.2 MKU/MKF/MKL gear pump units
with 3-liter plastic reservoir for oil
and fluid grease 30
4.3.3 MKU/MKF/MKL gear pump units
with 3-liter metal reservoir for oil
and fluid grease 31
4.3.4 MKU/MKF/MKL gear pump units
with 6-liter plastic reservoir for oil
and fluid grease 32
Example hydraulic connection
4.3.5 Example MKF 33
4.3.6 Example hydraulic connection MKU 34
4.3.7 Example hydraulic connection MKL 35
4.4 Attachment of a gear pump unit 36
4.5 Electrical connection 37
4.5.1 Electric motor connection 37
4.5.2 Electric motor connection with cable
socket and circular plug 38
4.5.3 Electric motor connection with
cable glands 39
4.6 Terminal diagrams 40
4.6.1 Legend to the terminal diagrams 40

5
EN
Table of contents
4.7 Terminal diagrams for MKU/MKF,
without control unit 41
MKU, 2-liter reservoir,
4.7.1 Voltage design 230/115 VAC,
without pushbutton 41
4.7.2 Voltage design 230/115 VAC,
with pushbutton 42
4.7.3 Voltage design 24 VDC, without
pushbutton 43
4.7.4 Voltage design 24 VDC, with
pushbutton 44
MKF, 2-liter reservoir,
4.7.5 Voltage design 230/115 VAC,
without pushbutton 45
4.7.6 Voltage design 230/115 VAC,
with pushbutton 46
4.7.7 Voltage design 24 V DC, without
pushbutton 47
4.7.8 Voltage design 24 VDC, with
pushbutton 48
MKU, 3- or 6-liter reservoir,
4.7.9 Voltage design 230/115 VAC,
without pushbutton 49
4.7.10 Voltage design 230/115 VAC,
with pushbutton 50
4.7.11 Voltage design 24 VDC,
without pushbutton 51
4.7.12 Voltage design 24 VDC,
with pushbutton 52
MKF, 3- or 6-liter reservoir,
4.7.13 Voltage design 230/115 VAC,
without pushbutton 53
4.7.14 Voltage design 230/115 VAC,
with pushbutton 54
4.7.15 Voltage design 24 VDC,
without pushbutton 55
4.7.16 Voltage design 24 VDC,
with pushbutton 56
4.8 Terminal diagrams for
MKU/MKF/MKL,
3- or 6-liter reservoir,
with control unit 57
MKU, 3- or 6-liter reservoir,
4.8.1 IG/IZ38 control unit,
voltage design 230/115 VAC 57
4.8.2 IGZ36 control unit,
voltage design 230/115 VAC 58
4.8.3 IGZ36 control unit,
voltage design 24 VDC 58
MKF, 3- or 6-liter reservoir,
4.8.4 IG/IZ38 control unit,
voltage design 230/115 VAC 59
4.8.5 IGZ36 control unit,
voltage design 230/115 VAC 60
4.8.6 IGZ36 control unit,
voltage design 24 VDC 60
MKL, 3- or 6-liter reservoir,
4.8.7 IG54 control unit,
voltage design 230/115 VAC 61
4.8.8 IG54 control unit,
voltage design 24 VDC 61
4.9 Technical connection data 62
4.10 Lubrication line connection 63
4.11 Assembly of the main lubrication
line with tapered sleeve union 64
4.12 Assembly of the lubrication lines
using plug connectors 65
4.13 System criteria for MKL
gear pump unit 66
4.14 General information on lubrication
line arrangement 67
4.15 Venting centralized lubrication system 68
4.16 Note on the rating plate 69
4.17 Notes on the CE marking 69

6
EN
Operating instructions associated with
assembly instructions 71
1. Safety instructions 72
2. Lubricants 72
3. Delivery, returns, and storage 73
3.1 Checking the delivery 73
3.2 Returns 73
3.3 Storage 73
3.3.1 Lubrication units 73
3.3.2 Electronic and electrical devices 73
3.3.3 General notes 73
4. Assembly 74
4.1 Information on assembly 74
5. Functional description 74
5.1 General 74
5.2 Structure of a gear pump unit 75
5.3 Gear pump unit without control unit 77
5.4 Gear pump unit with control unit
(IG/IZ38, IGZ36, IG54) 78
5.5 Control unit designs with their
basic settings 79
5.6 Lubrication systems
5.6.1 General 81
5.6.2 Total-loss lubrication systems 81
5.6.3 Single-line systems with piston
distributors 81
5.6.4 Lubricating cycle sequence 82
5.6.5 Lubricating cycle of prelubrication
distributor 82
5.6.6 Lubricating cycle of relubrication
distributor 83
6. Commissioning 84
6.1 General 84
6.2 Interim lubrication pushbutton 84
6.3 Commissioning 85
7. Operation/shutdown and disposal 86
7.1 Operation 86
7.2 Temporary shutdown
7.3 Recommissioning 87
7.4 Shutdown and disposal 87
8. Maintenance 88
8.1 General 88
8.2 Maintenance schedule 89
8.3 Service 89
9. Malfunctions, causes, and remedies 90
9.1 Prior to beginning troubleshooting 90
9.2 Replacing a defective fuse (24 VDC) 91
9.3 Commissioning, product, and
system malfunctions 92
10. Technical data 95
11. Spare parts 96
12. Accessories 99

7
EN
Possible symbols
Meaning
Note
Electrical component hazard, elec-
tric shock hazard
Slipping hazard
Hazard from hot components
Hazard from hot surface
Risk of being drawn into machinery
Crushing hazard
Danger from suspended load
Pressure injection hazard
Explosion-proof component
Electrostatic sensitive components
Wear personal safety equipment
(goggles)
Secure (lock) the closing
device against accidental starting of
the machine
Environmentally sound disposal
Explanation of symbols and signs
Explanation of symbols and signs
You will find these symbols, which warn of
specific dangers to persons, material assets,
or the environment, next to all safety inst-
ructions in these operating instructions.
Read the instructions completely and follow
all operating instructions and the warning
and safety instructions.
Information symbols within the text
Symbol Meaning
Prompts an action
Used for itemizing
Refers to other facts, causes, or consequences
Provides additional information within procedures
Warning level Consequence Probability
DANGER Death / serious injury Immediate
WARNING Serious injury Possible
CAUTION Minor injury Possible
NOTE Property damage Possible
Symbol

8
EN
Instructions placed on a unit, machine, or
equipment, such as:
o Rotation arrow
o Fluid connection labels must be followed
and kept in fully legible condition.
o Warnings
Explanation of symbols and signs
Abbreviations and conversion factors
Abbreviations
re regarding oz. ounce
approx. approximately psi pounds per square inch
°C degrees Celsius hp horsepower
s seconds lb. pound
dB (A) sound pressure level sq.in. square inch
i.e. that is cu.in. cubic inch
etc. et cetera mph miles per hour
poss. possibly fpsec feet per second
< less than °F degrees Fahrenheit
± plus or minus fl.oz. fluid ounce
> greater than in. inch
e.g. for example gal. gallon
if necessary if necessary
etc. et cetera Conversion factors
usually usually Length 1 mm = 0.03937 in.
Ø diameter Area 1 cm² = 0.155 sq.in.
incl. including Volume 1 ml = 0.0352 fl.oz.
K Kelvin 1 l = 2.11416 pints (US)
kg kilogram Mass 1 kg = 2.205 lbs
RH relative humidity 1 g = 0.03527 oz.
kW kilowatt Density 1 kg/cm³ = 8.3454 lb./gal.
(US)
l liter 1 kg/cm³ = 0.03613 lb./cu.in.
Min. minute Force 1 N = 0.10197 kp
max. maximum Speed 1 m/s = 3.28084 fpsec
min. minimum 1 m/s = 2.23694 mph
mm millimeter Acceleration 1 m/s² = 3.28084 ft./s²
ml milliliter Pressure 1 bar = 14.5 psi
N Newton Temperature °C = (°F-32) x 5/9
Nm Newton meter Power 1 kW = 1.34109 hp

9
1
ENEN
1. Safety instructions
1.1 General safety instructions
The operator must ensure that the assembly
instructions/operating instructions are read
by all persons tasked with working on the
product or who supervise or instruct such
persons. The operator must also ensure that
the staff fully understands the content of the
instructions.
The assembly instructions/operating in-
structions must be kept readily available
together with the product.
Note that the assembly instructions/operating
instructions form part of the product and
must accompany the product if sold to a
new owner.
The product described here was manu-
factured according to the state of the art.
Risks may, however, arise from its usage
and may result in personal injury or damage
to material assets.
Any malfunctions which may affect safety
must be remedied immediately. In addition
to the assembly instructions/operating in-
structions, statutory regulations and other
regulations for accident prevention and
environmental protection must be observed
and applied.
1.2 General behavior when handling the
product
o The product may only be used in aware-
ness of the potential dangers, in proper
technical condition, and according to the
information in this manual.
o Personnel must familiarize themselves
with the function and operation of the
product. The specified assembly and ope-
rating steps and their sequences must be
observed.
o Any unclear points regarding proper con-
dition or correct assembly/operation must
be clarified. Operation is prohibited until
issues have been clarified.
o Unauthorized persons must be kept away
from the product.
o All safety instructions and in-house inst-
ructions relevant to the particular activity
must be observed.
o Responsibilities for different activities
must be clearly defined and observed.
Uncertainty seriously endangers safety.
o Protective and safety mechanisms must
not be removed, modified, or disabled
during operation and must be checked
for proper function and completeness at
regular intervals.
If protective and safety mechanisms
must be removed, they must be installed
immediately following conclusion of work
and checked for proper function.
o Any malfunctions that occur must be
resolved according to responsibility. The
supervisor must be notified immediately
in case of malfunctions outside one's indi-
vidual scope of responsibility.
1. Safety instructions

10
ENEN
o Wear personal protective equipment.
o Observe the relevant safety data sheets
when handling lubricants/equipment.
1.3 Qualified technical personnel
Only qualified technical personnel may
install, operate, maintain, and repair the
products described here.
Such persons are familiar with the relevant
standards, rules, accident prevention regu-
lations, and assembly conditions as a result
of their training, experience, and instruction.
They are qualified to carry out the required
activities and in doing so recognize and
avoid any potential hazards. The definition of
qualified personnel and the prohibition against
employing non-qualified personnel are laid
down in DIN VDE 0105 and IEC 364.
Relevant country-specific definitions of qua-
lified technical personnel apply for countries
outside the scope of DIN VDE 0105 or
IEC 364.
The operator is responsible for assigning
tasks and the area of responsibility.
The personnel must be trained and instructed
prior to beginning work if they do not possess
the requisite knowledge.
Product training can also be performed by
SKF in exchange for costs incurred.
1. Safety instructions

11
1
ENEN
1.5 System pressure or hydraulic
pressure hazard
1.4 Electric shock hazard
WARNING
Electric shock
Assembly, maintenance, and repair
work may only be performed by
qualified technical personnel.
De-energize the product prior to
beginning work.
Local conditions for connections
and local regulations (e.g., DIN,
VDE) must be observed.
WARNING
System pressure
Hydraulic pressure
Lubrication systems are pressurized
during operation. Centralized lu-
brication systems must therefore
be depressurized before starting
assembly, maintenance, or repair
work, or any system modifications
or system repairs.
1.6 Operation
The following must be observed while working
on the product.
o All information within this manual and
the information within the referenced
documents
o All laws and regulations that the operator
must observe
1. Safety instructions

12
ENEN
All relevant persons (e.g., operating personnel,
supervisors) must be informed of the activity
prior to the start of work. Precautionary
operational measures / work instructions
must be observed.
o Take appropriate measures to ensure
that moving/detached parts are immo-
bilized during the work and that no body
parts can be pinched by unintended
movements.
o Assemble the product only outside the
operating range of moving parts, at an
adequate distance from sources of heat
or cold.
o Prior to performing work, the product
and the machine/system in which the
product is integrated must be de-ener-
gized and depressurized and secured
against unauthorized activation.
o All work on electrical components may be
performed only with voltage-insulated
tools.
o Fuses must not be bridged. Always replace
fuses with fuses of the same type.
o Ensure proper grounding of the product.
o Drill required holes only on non-critical,
non-load bearing parts.
o Other units of the machine/the vehicle
must not be damaged or impaired in their
function by the installation of the centra-
lized lubrication system.
o No parts of the centralized lubrication
device may be subjected to torsion, shear,
or bending.
o Use suitable lifting gear when working
with heavy parts.
o Avoid mixing up/incorrectly assembling
disassembled parts. Label parts.
1.7 Assembly/maintenance/malfunction/decommissioning/disposal
1. Safety instructions
1.8 Intended use
Gear pump units of SKF series MKU, MKF,
and MKL are for supplying centralized lu-
brication systems with lubricant and are
intended for use in centralized lubrication
systems. They feed mineral and synthetic
oils and greases that are compatible with
plastic and NBR elastomers.
Gear pump units of product series MKU
and MKL are suitable for supplying oil with
a viscosity range from 20 to 1500 mm²/s.
Gear pump units of product series MKF are
for supplying fluid greases of NLGI grades
000 and 00.
The permissible operating temperature ran-
ge is +10 to +40°C on all three series.
The Technical Data in Chapter 4 as well as
Chapter 10 must be observed.
Only media approved for the gear pump
units may be used. Unsuitable media may
result in pump unit failure and potentially
severe bodily injury or death and property
damage.
The use of synthetic and biodegradable oils
or greases requires prior approval from SKF.

13
1
ENEN
Any other usage is deemed non-compliant
with the intended use.
1. Safety instructions
1.9 Foreseeable misuse
Any usage of the product differing from
the aforementioned conditions and stated
purpose is strictly prohibited. Particularly
prohibited are:
o Use in another, more critical explosion
protection zone, if applied as ATEX
o to supply, transport, or store hazardous
substances and mixtures in accordance
with annex I part 2-5 of the CLP regu-
lation (EC 1272/2008), which have been
marked with hazard pictograms
GHS01-GHS 09
o Use to feed / forward / store gases, lique-
fied gases, dissolved gases, vapors, or
fluids whose vapor pressure exceeds nor-
mal atmospheric pressure (1013 mbar)
by more than 0.5 bar at their maximum
permissible operating temperature
1.10 Disclaimer of liability
The manufacturer shall not be held liable
for damage resulting from:
o Failure to comply with these instructions
o The use of lubricants/media not approved
for the unit type
o Contaminated or unsuitable lubricants
o Installation of non-original SKF compo-
nents
o Inappropriate usage
o Resulting from improper assembly,
configuration, or filling
o Improper response to malfunctions
o Non-observance of maintenance
intervals
o Independent modification of system
components
Unless specially indicated otherwise, gear
pump units of SKF series MKU, MKL, and
MKF are not approved for use in potentially
explosive areas as defined in the ATEX
Directive 2014/34/EC.

14
ENEN
Vor Önen der Haube
Switch o voltage before
Avant d'ouvrir le couvercle
Spannung ausschalten.
removing the cover.
coupez la tension.
951-110-270
1. Safety instructions
1.12 Warning labels on the product
The following information labels are affixed
to the product. Before commissioning,
check that the labels are present and intact.
Immediately replace warning labels if da-
maged or missing. The product must not
be operated until then. See the positioning
diagram for the order number and position
on the product.
Warning label, item 1
WARNING
Order No.: 951-110-270
Positioning of warning labels, Fig 1
Item 1
1.11 Referenced documents
In addition to this manual, the following
documents must be observed by the
respective target group:
o Operational instructions/approval rules
o Instructions from suppliers of purchased
parts
o Manual for the insulation resistance
tester
o Safety data sheet of the lubricant/equip-
ment used
o Project planning documents and other
relevant documents
For pumps with control unit:
- Control unit: IG38-30-I or IZ38-30-I
Operating instructions: 951-180-000-EN
- Control unit: IGZ36-20-S6-I or
IG54-20-S4-I
Operating instructions: 951-180-001-EN
The operator must supplement these do-
cuments with applicable regulations for the
country of use. The documentation must
be included if the product is transferred to a
new operator.
Vor Önen der Haube
Switch o voltage before
Avant d'ouvrir le couvercle
Spannung ausschalten.
removing the cover.
coupez la tension.
951-110-270

15
1
ENEN
1. Safety instructions
1.13 Residual risks
Residual risk Remedy
Life cycle: Assembly
Electric shock due to defective power
lead/mains plug
• Inspect the power lead/mains plug for damage before starting the product
People slipping due to floor contaminati-
on with spilled/leaked lubricant
• Exercise caution when connecting the product’s hydraulic connections
• Promptly apply suitable binding agents and remove the leaked/spilled lubricant
• Follow operational instructions for handling lubricants and contaminated parts
Tearing/damage to lines when installed
on moving machine components
• If possible, do not install on moving parts; if this cannot be avoided, use flexible hose lines
Life cycle: Commissioning / operation
Electric shock due to defective power
lead/mains plug
• Inspect the power lead/mains plug for damage before starting the product
Lubricating oil spraying out due to faulty
component fitting / faulty line connection
• Securely tighten all components with a suitable tool or using the specified torques. Use
hydraulic screw unions and lines suitable for the indicated pressures. These must be checked
for proper connection and for damage prior to commissioning
Life cycle: Setup, retrofit
People slipping due to floor contaminati-
on with spilled/leaked lubricant
• Exercise caution when undoing or connecting the product’s hydraulic connections
• Promptly apply suitable binding agents and remove the leaked/spilled lubricant
• Follow operational instructions for handling lubricants and contaminated parts

16
ENEN 1. Safety instructions
Residual risk Remedy
Life cycle: Malfunction, troubleshooting, maintenance, repair
Electric shock due to defective power lead/
mains plug
• Inspect the power lead/mains plug for damage before starting the product
Electric shock from open electric motor or
active energized components
• Disconnect the mains plug (cut power) before performing any work on electrical components.
• Exercise caution when winding and unwinding the power lead and when operating the
product
Strong heating of the electric motor due
to a motor jam or continuous duty
• Turn off the pump motor and let it cool down. Remedy the cause
People slipping due to floor contamination
with spilled/leaked lubricant
• Exercise caution when undoing or connecting the product’s hydraulic connections
• Promptly apply suitable binding agents and remove the leaked/spilled lubricant
• Follow operational instructions for handling lubricants and contaminated parts
Life cycle: Decommissioning, disposal
People slipping due to floor contamination
with spilled/leaked lubricant
• Exercise caution when disconnecting the product’s hydraulic connections
• Promptly apply suitable binding agents and remove the leaked/spilled lubricant
• Follow operational instructions for handling lubricants and contaminated parts
Environmental contamination by lubricants
and wetted parts
• Dispose of contaminated parts according to the applicable legal/company rules

17
2
1
EN
2. Lubricants
2. Lubricants
2.1 General information
Intended use is the use of the products for
the purpose of providing centralized lubri-
cation/lubrication of bearings and friction
points using lubricants within the physical
usage limits which can be found in the do-
cumentation for the devices, e.g., operating
instructions and the product descriptions,
e.g., technical drawings and catalogs.
We expressly point to the fact that hazardous
substances and mixtures in accordance with
annex I part 2-5 of the CLP regulation
(EC 1272/2008) may be filled into SKF
centralized lubrication systems and compo-
nents and delivered and/or distributed with
such systems only after consulting with and
obtaining written approval from SKF.
Selection of a lubricant suitable for the
lubrication task is made by the machine/
system manufacturer and/or the operator of
the machine/system in cooperation with the
lubricant supplier.
When selecting a lubricant, the type of bea-
rings/friction points, the expected load du-
ring operation, and the anticipated ambient
conditions must be taken into account. All
economic and environmental aspects must
also be considered.
NOTE
Observe the instructions from the machine
manufacturer regarding the lubricants that are
to be used.
The amount of lubricant required at a lubricati-
on point is specified by the bearing or machine
manufacturer.
It must be ensured that the required quantity
of lubricant is provided to the lubrication point.
The lubrication point may otherwise not receive
adequate lubrication, which can lead to damage
and failure of the bearing.
2.2 Selection of lubricants
No products manufactured by SKF Lubri-
cation Systems are approved for use in
conjunction with gases, liquefied gases,
pressurized gases in solution, vapors, or
such fluids
whose vapor pressure exceeds normal at-
mospheric pressure (1013 mbar) by more
than 0.5 bar at their maximum permissible
temperature.
Other media which are neither lubricant nor
hazardous substance may only be fed after
consultation with and written approval from
SKF Lubrication Systems.
SKF Lubrication Systems considers lubricants
to be an element of system design that
must always be factored into the selection
of components and the design of centralized
lubrication systems. The lubricating properties
of the lubricants are critically important in
making these selections.
NOTE
All products from SKF Lubrication Systems
may be used only for their intended purpose
and in accordance with the information in
the product's operating instructions.

18
EN 2. Lubricants
Please contact SKF Lubrication Systems if
you have further questions regarding lubri-
cants. It is possible for lubricants to be tested
in the company's laboratory for their suitability
for pumping in centralized lubrication systems
(e.g., "bleeding").
You can request an overview of the lubricant
tests offered by SKF Lubrication Systems
from the company's Service department.
The product described here can be operated
using lubricants that meet the specifications
in the technical data. Depending on the
product design, these lubricants may be oils,
fluid greases, or greases.
Oils and base oils may be mineral, synthetic,
and/or rapidly biodegradable. Consistency
agents and additives may be added depending
on the operating conditions.
Note that in rare cases, there may be
lubricants whose properties are within the
permissible limits values but whose other
characteristics render them unsuitable for
use in centralized lubrication systems. For
example, synthetic lubricants may be in-
compatible with elastomers.
NOTE
Only lubricants approved for the product
may be used. Unsuitable lubricants can
lead to failure of the product and to property
damage.
2.3 Approved lubricants
NOTE
Different lubricants must not be mixed
together. Doing so can cause damage and
require costly and complicated cleaning
of the product/lubrication system. It is
recommended that an indication of the lu-
bricant in use be attached to the lubricant
reservoir in order to prevent accidental
mixing of lubricants.
NOTE
If necessary, SKF Lubrication Systems can
help customers to select suitable compo-
nents for feeding the selected lubricant
and to plan and design their centralized
lubrication system.

19
2
EN
2. Lubricants
2.5 Lubricant hazards
WARNING
Lubricants
Products must always be free of
leaks. Leaking lubricant is hazardous
due to the risk of slipping and
injury. Beware of any lubricant
leaking out during assembly, ope-
ration, maintenance, or repair of
centralized lubrication systems.
Leaks must be sealed off without
delay.
NOTE
Follow the safety instructions on the lubri-
cant's safety data sheet.
2.4 Lubricants and the environment
NOTE
Lubricants can contaminate soil and
waterways. Lubricants must be used and
disposed of properly. Observe the local
regulations and laws regarding the disposal
of lubricants.
It is important to note that lubricants are
environmentally hazardous, flammable
substances which require special precauti-
onary measures during transport, storage,
and processing. Consult the safety data
sheet from the lubricant manufacturer
for information regarding transport, storage,
processing, and environmental hazards of
the lubricant that will be used.
The safety data sheet for a lubricant can be
requested from the lubricant manufacturer.
Leaking lubricant is a serious hazard.
Leaking lubricant can create risks that may
result in physical harm to persons or damage
to other material assets.

20
EN 3. Overview
3. Overview
MKU gear pump unit
Units of product series MKU are suitable for
supplying oil with a viscosity range from
20 to 1500 mm²/s.
The units are optionally equipped with a
pressure switch and/or fill level switch. The
electrical connection is established via DIN
connection plugs or cable glands.
Units with a reservoir capacity of 2, 3, or 6
liters are optionally available with an
integrated control unit.
MKU
MKF gear pump unit
Units of product series MKF are suitable for
supplying fluid greases of NLGI grades 000
and 00.
The units are optionally equipped with a
pressure switch and/or fill level switch.
The electrical connection is established via
DIN connection plugs or cable glands.
Units with a reservoir capacity of 2, 3, or 6
liters are optionally available with an
integrated control unit.
3.1 Description of designs
MKF
MKL gear pump unit
Units of product series MKL are designed for
oil+air centralized lubrication systems and
supply oil with a viscosity range from
20 to 1500 mm²/s.
The units are equipped with a pressure
switch and a fill level switch whose signals are
evaluated using an integrated control unit.
The control unit also provides the ability to
evaluate the signal from an external air pres-
sure switch to monitor the oil+air system. The
electrical connections are established via DIN
connection plugs or cable glands.
MKL