SKF Lincoln PFHM-EEX User manual

Version 02
951-180-078-EN
EN
Operating instructions
according to ATEX Directive 2014/34/EU
PFHM-EEX
Multi-piston pump with reservoir

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951-180-078-EN
Version 02
EN
Jürgen Kreutzkämper
Manager R&D Germany
SKF Lubrication Business Unit
Stefan Schürmann
Manager R&D Hockenheim/Walldorf
SKF Lubrication Business Unit
EU Declaration of Conformity pursuant to ATEX Directive 2014/34/EU, Annex X
The manufacturer, SKF Lubrication Systems GmbH, Hockenheim Plant, 2. Industriestr. 4, DE - 68766 Hockenheim hereby declares the conformity of the device:
Designation: Multi-piston pump with reservoir Type: PFHM-EEX
Item number: PFHM-6-B6-C3-ATEX / with enhanced corrosion protection: PFHM-6-B6-C5-ATEX
Year of manufacture: See type plate
Explosion protection marking Mining Gas Dust
PFHM-6-B6-C3-ATEX I M2 Ex h I Mb II 2G Ex h IIC T6...T5 Gb II 2D Ex h IIIC T85°C ...T100°C Db
PFHM-6-B6-C5-ATEX I M2 Ex h I Mb II 2G Ex h IIB T6...T5 Gb II 2D Ex h IIIC T85°C ...T100°C Db
with all essential safety and health requirements of ATEX Directive 2014/34/EU as well as the basic safety and health protection requirements of
Machinery Directive 2006/42/EC specified below at the time of placing on the market.
1.1.2 · 1.1.3 · 1.3.2 · 1.3.4 · 1.5.2 · 1.5.3 · 1.5.6 · 1.5.7 · 1.5.8 · 1.5.9 · 1.6.1 · 1.7.1 · 1.7.3 · 1.7.4
The technical documentation pursuant to:
- ATEX Directive 2014/34/EU AnnexVIII No. 2 has been prepared and filed at a conformity assessment body.
- Machinery Directive 2006/42/ECAnnex VII Part B has been prepared.
We undertake to transmit these in electronic form in response to a reasoned request by the national authorities.The Head of Standardization is the authorized
representative for the technical documentation. See the manufacturer information for the address. Furthermore, the following Directives and (harmonized)
standards were applied in the applicable areas:
Standard Edition Standard Edition Standard Edition
EN ISO 12100 2010 EN 1127-1 2011 EN ISO 80079-36 2016
EN 809+A1/AC 2010 EN 1127-2 2014 EN ISO 80079-37 2016
The device must not be put into service until the machinery into which it is to be incorporated has been declared in conformity with the provisions of ATEX Directive
2014/34/EU, Machinery Directive 2006/42/EC, and all other applicable Directives.
Hockenheim, September 3, 2018
EC Declaration of Conformity

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951-180-078-EN
Version 02
ENMasthead
Training
SKF conducts detailed training in order to
enable the maximum safety and efficiency.
SKF recommends taking advantage of this
training. For information, contact the rel-
evant SKF service address.
Copyright
© Copyright SKF
All rights reserved.
Warranty
The instructions do not contain any
information on the warranty. This can
be found in our General Terms and
Conditions.
Notes on operating instructions
These operating instructions are operating
instructions in accordance with ATEX Direc-
tive 2014/34/EU. The instructions are an
integral part of the described products and
must be kept for future use.
Disclaimer of liability
The manufacturer shall not be held liable
for damage resulting from:
○Improper usage, assembly, operation,
configuration, maintenance, repair, or
accidents
○Improper reaction to malfunctions
○Unauthorized modifications to the
product
○Intentional or gross negligence
○Use of non-original SKF spare parts
The maximum liability for loss or damage
resulting from the use of our products is lim-
ited to the purchase price. Liability for
indirect damage of any kind is excluded.
Masthead
Manufacturer
SKF Lubrication Systems Germany GmbH
Address of manufacturer plants
Headquarters
Walldorf Plant
Heinrich-Hertz-Str. 2-8
69190 Walldorf
Germany
Tel.: [phone]
Fax: [phone]
Berlin Plant
Motzener Straße 35/37
12277 Berlin
Germany
Tel. [phone]
Fax [phone]
Hockenheim Plant
2. Industriestraße 4
68766 Hockenheim
Germany
Tel. [phone]
Fax [phone]
E-mail: [e-mail]
www.skf.com/lubrication

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951-180-078-EN
Version 02
EN Table of contents
Table of contents
EU Declaration of Conformity pursuant to ATEX Directive 2014/34/EU,
Annex X2
Masthead.......................................................................................... 3
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 Intended use..........................................................................................10
1.4 Foreseeable misuse..............................................................................10
1.5 Varnishing..............................................................................................11
1.5.1 Painting plastic components .........................................................11
1.6 Inspections prior to delivery ................................................................12
1.7 Modifications to the product................................................................12
1.8 Prohibition of certain activities............................................................12
1.9 Referenced documents ........................................................................12
1.10 Markings on the product......................................................................13
1.11 Notes on the type plate ........................................................................13
1.12 Note on CE marking..............................................................................14
1.13 Persons authorized to use the product ..............................................14
1.13.1 Operator...........................................................................................14
1.13.2 Qualified mechanic .........................................................................14
1.13.3 Specialist in maintenance and servicing in
potentially explosive atmospheres .......................................... 14
1.14 Instruction of outside fitters ................................................................15
1.15 Provision of personal protective gear.................................................15
1.16 Operation...............................................................................................15
1.17 Emergency shutdown ..........................................................................15
1.18 Transport, assembly, maintenance, malfunction,
repair, shutdown, disposal.................................................................16
1.19 First start-up, daily start-up ...............................................................17
1.20 Cleaning .................................................................................................17
1.21 Protective and safety mechanisms.....................................................18
1.22 Special safety instructions regarding explosion protection .............18
1.23 Nullification of ATEX approval..............................................................20
1.24 Operation in potentially explosive atmospheres ...............................21
1.25 Explosion protection marking..............................................................21
1.25.1 Temperature marking ....................................................................21
1.26 Obligations of the operator..................................................................21
1.26.1 Identification of hazards.................................................................21
1.26.2 Explosion protection measures.....................................................21
1.26.3 Provision of necessary information ..............................................22
1.26.4 Duty to provide instruction and training ......................................23
1.27 Residual risks ........................................................................................24
1.28 Residual ATEX risks...............................................................................25
2. Lubricants .......................................................................... 27
2.1 General information .............................................................................27
2.2 Selection of lubricants..........................................................................27
2.3 Material compatibility...........................................................................28
2.4 Aging of lubricants................................................................................28
2.5 Lubricants in potentially explosive atmospheres..............................28

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ENTable of contents
3. Overview, functional description.......................................... 29
3.1 Overview of the PFHM multi-piston pump unit................................29
3.2 Description of design and operation...................................................30
4. Technical data..................................................................... 32
4.1 Tightening torques ...............................................................................32
4.2 Technical data........................................................................................33
4.3 Layout of pump elements....................................................................34
4.4 Nominal delivery rates of pump elements........................................35
4.5 Pressure regulating valves...................................................................36
5. Delivery, returns, storage .................................................... 37
5.1 Supply ....................................................................................................37
5.2 Return shipment...................................................................................37
5.3 Storage...................................................................................................37
5.3.1 Corrosion protection.......................................................................38
5.4 Transport ...............................................................................................38
5.4.1 Transporting using transport net and crane ...............................39
5.4.2 Transport by pallet truck or forklift................................................40
6. Assembly ............................................................................ 41
6.1 General information .............................................................................41
6.2 Assembly location .................................................................................42
6.3 Mechanical connection.........................................................................42
6.3.1 Minimum mounting dimensions...................................................42
6.3.2 Assembly holes ...............................................................................42
6.3.3 Installation of the pump housing .................................................42
6.4 Assembly of a pump element with pressure relief valve ..................44
6.5 Assembly of the lubrication piping......................................................45
6.5.1 Lubrication line arrangement .......................................................46
6.6 Connection of the hydraulic lines ........................................................47
6.7 Establishing equipotential bonding connection.................................48
6.8 Filling with lubricant .............................................................................49
6.8.1 Filler coupling (accessories)...........................................................50
6.9 Setting the delivery rate.......................................................................50
6.9.1 Varying pump displacement..........................................................51
7. First start-up...................................................................... 52
7.1 Vent the lubrication system .................................................................52
7.2 Re-adjusting the delivery volume.......................................................52
7.3 Inspections before first start-up .........................................................52
7.4 Inspections during first start-up.........................................................53

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EN Table of contents
8. Operation ........................................................................... 54
8.1 Refilling lubricant..................................................................................54
9. Cleaning ............................................................................. 55
9.1 Cleaning agents.....................................................................................55
9.2 Exterior cleaning...................................................................................55
9.3 Interior cleaning....................................................................................55
10. Maintenance....................................................................... 56
10.1 Filter cleaning/filter replacement........................................................57
11. Malfunctions, causes, and remedies..................................... 59
12. Repairs............................................................................... 61
12.1 Replacing a pump element..................................................................61
12.2 Replace the packing ring of the overfill release valve. ......................63
12.3 Replacement of the service cover.......................................................64
12.4 Replace the ventilation hose of the filter unit. ...................................65
13. Shutdown, disposal............................................................. 66
13.1 Temporary shutdown...........................................................................66
13.2 Permanent shutdown, disassembly ...................................................66
13.3 Disposal..................................................................................................66
14. Spare parts/accessories....................................................... 67
14.1 Service cover, complete........................................................................67
14.2 Pump elements with seal.....................................................................67
14.3 Pressure regulating valve ....................................................................68
14.4 Air filter...................................................................................................68
14.5 Seal set for overfill release valve.........................................................68
14.6 Ventilation hose.....................................................................................68
14.7 Hydraulic screw union (inlet and outlet).............................................68
14.8 Accessories ............................................................................................69
14.8.1 Filler coupling..................................................................................69
14.8.2 Screw plug.......................................................................................69
15. Appendix ............................................................................ 70

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951-180-078-EN
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ENExplanation of symbols, signs, and abbreviations
Explanation of symbols and signs
General warning Risk of electrical shock Risk of slipping Hot surfaces
Being drawn into machinery Crushing hazard Pressure injection Suspended load
Electrostatic sensitive
components
Potentially explosive
atmosphere General notes Unauthorized persons must be kept away.
Wear personal protective gear
(goggles)
Wear personal protective gear
(face mask)
Wear personal protective gear
(gloves)
Wear personal protective
gear (protective clothing)
Wear personal protective gear
(protective footwear) CE marking Disposal, recycling
Warning level Consequence Probability Symbol Meaning
DANGER Death, serious
injury Immediate lChronological instructions
WARNING Death, serious
injury Possible ¦Bullet list items
CAUTION Minor injury Possible FIndicates the requirements that must be met for the actions
described in the following
IMPORTANT NOTE Property damage Possible

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951-180-078-EN
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EN Explanation of symbols, signs, and abbreviations
Abbreviations and conversion factors
re regarding °C degrees Celsius °F degrees Fahrenheit
approx. approximately K Kelvin Oz. ounce
i.e. that is N Newton fl. oz. Fluid ounce
incl. including h hour in. inch
min. minimum s second psi pound per square inch
max. maximum d day sq.in. square inch
min minute Nm Newton meter cu. in. cubic inch
etc. et cetera ml milliliter mph miles per hour
e.g. for example ml/d milliliters per day rpm revolutions per minute
kW kilowatt ccm cubic centimeter gal. gallon
U voltage mm millimeter lb. pound
R Resistance l liter hp horsepower
I current intensity db (A) sound pressure level kp kilopond
V volt > greater than fpsec feet per second
Wwatt < less than Conversion factors
AC alternating current ± plus minus Length 1 mm = 0.03937 in.
DC direct current Ø diameter Area 1 cm² = 0.155 sq.in.
A ampere kg kilogram Volume 1 ml = 0.0352 fl.oz.
Ah ampere hour RH relative humidity 1 l = 2.11416 pints (US)
Hz Frequency (Hertz) approximately Mass 1 kg = 2.205 lbs
NC normally closed contact = equal to 1 g = 0.03527 oz.
NO normally open contact % percent Density 1 kg/cm³ = 8.3454 lb./gal(US)
‰ per mil (thousandth) 1 kg/cm³ = 0.03613 lb./cu.in.
greater or equal Force 1 N = 0.10197 kp
less or equal Pressure 1 bar = 14.5 psi
mm2square millimeter Temperature °C = (°F-32) x 5/9
rpm Revolutions per minute Power 1 kW = 1.34109 hp
Acceleration 1 m/s² = 3.28084 ft./s²
Speed 1 m/s = 3.28084 fpsec
1 m/s = 2.23694 mph

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EN1. Safety instructions
1. Safety instructions
1.1 General safety instructions
The operator must ensure that the instruc-
tions 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. Putting the
products into operation or operating them
without having read the instructions is
prohibited.
○Retain the instructions for further use.
○The products described here were
manufactured according to the state of
the art. Risks may, however, arise from
non-compliant 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 these instructions, the statutory regula-
tions for accident prevention and environ-
mental protection must be observed.
1.2 General behavior when handling the
product
○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.
○Familiarize yourself with the functions
and operation of the product.The speci-
fied assembly and operating steps and
their sequences must be observed.
○Any unclear points regarding proper con-
dition or correct assembly/operation must
be clarified. Operation is prohibited until
issues have been clarified.
○Unauthorized persons must be kept
away.
○Wear personal protective equipment.
○All safety regulations and in-house in-
structions relevant to the particular activ-
ity must be observed.
○Responsibilities for different activities
must be clearly defined and observed.
Uncertainty seriously endangers safety.
○Protective and safety mechanisms must
not be removed, modified, nor 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 reinstalled
immediately following conclusion of work
and then inspected for proper function.

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EN 1. Safety instructions
1.3 Intended use
Feed lubricants only in compliance with the
specifications, technical data, and limits pre-
sented in this manual.
The PFHM ATEX multi-line pump is supplied
without installed pump elements or pressure
relief valves.
Only SKF pump elements and SKF pressure
relief valves approved for the PFHM may be
installed. The pump may be operated only
with SKF pressure relief valves.
The customer must install a volumetric flow
controller for the hydraulic motor that en-
sures a continuous flow rate in accordance
with the technical data, for example by a flow
control valve.
Usage is permitted exclusively in the context
of commercial or business activity by profes-
sional users.
1.4 Foreseeable misuse
Any usage of the product other than as
specified in this manual is strictly prohibited.
Particularly prohibited are:
○Use outside the specified operating tem-
perature range
○Use of non-specified equipment
○Use without a pressure regulating valve
○Use in areas with aggressive, corrosive
substances (e.g., high ozone loads)
○Use in areas with damaging radiation
(e.g., ionizing radiation)
○Use without an approved and tested
switch-off device for the operation of
explosion-proof equipment in ATEX cat-
egory I M2
○Any malfunctions that occur must be
resolved according to responsibility. The
supervisor must be notified immediately
in case of malfunctions outside one's in-
dividual scope of responsibility.
○Never use any part of the centralized
lubrication system as a stand or step or
for climbing.

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EN1. Safety instructions
○Use to feed, forward, or store hazardous
substances and mixtures as defined in
Annex I Part 2-5 of the CLP Regulation
(EC 1272/2008) that are marked with
hazard pictograms GHS01-GHS 09
○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
○Use to feed, forward, or store lubricants
containing volatile solvents
○Use in potentially explosive gases and
vapors whose ignition temperature is
less than 125% of the maximum surface
temperature
○Use in potentially explosive dusts whose
minimum ignition temperature and glow
temperature are less than 150% of the
maximum surface temperature
○Use in another, more critical explosion
protection zone than specified on the type
plate
○Use with a damaged, missing, or improp-
erly performed subsequent finish
○Operation of the pump without lubricant
This may cause heating of the bearings
in the range of the ignition temperature.
The pump's container must be filled with
suitable lubricant at regular and appro-
priate intervals.
○Filter air hose cannot be used as filling
hose.
1.5 Varnishing
All (varnished) components of the pump are
painted in accordance with the requirements
of DIN EN 60079 (electrostatic charge). If re-
varnishing becomes necessary, for example
after a repair, corrosion, etc., the require-
ments of DIN EN 60079-0 must likewise be
met. Carefully mask all seals before varnish-
ing. Compatibility of the varnishing with the
sealing materials in use must be ensured.
1.5.1 Painting plastic components
The painting of all plastic components and
seals of the products described here is
prohibited.
Completely remove or mask affected compo-
nents before painting the main machine.

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EN 1. Safety instructions
1.9 Referenced documents
In addition to this manual, the following
documents must be observed by the respec-
tive target group:
○Operational instructions, approval rules
○The safety data sheet of the lubricant
used
○The explosion protection document of the
operator
If necessary:
○Project planning documents
○Instructions from suppliers of purchased
parts
○Instructions for other components for
setting up the centralized lubrication
system
○Other relevant documents for integration
of the product into the main machine,
system
1.6 Inspections prior to delivery
The following tests were performed prior to
delivery:
○Safety and functional tests
○Inspections pursuant to the requirements
of the ATEX Directive
1.7 
Unauthorized modifications and changes
can have an unpredictable effect on safety.
Unauthorized modifications and changes are
therefore prohibited.
1.8 Prohibition of certain activities
The following activities must be performed
only by employees of the manufacturer or
authorized persons due to possibly unde-
tectable sources of error or due to statutory
requirements:
○Repairs, modifications to the drive
○Replacement, modifications to the pis-
tons of the pump elements

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EN1. Safety instructions
1.10 Markings on the product
Crushing hazard from open
reservoir
Order No. 44-1826-3096
Hot surface
Order No. 291-10133-5
Equipotential bonding connec-
tion
Order No. 3515-11-0108
(1 set, consisting of
10 PE stickers)
Hydraulic motor connection
Order No. 44-1826-7270
Positioning of information labels
1.11 Notes on the type plate
The type plate provides important data such
as the product serial number, material num-
ber, etc.
To avoid loss of this data in case the type
plate becomes illegible, these characteristics
should be entered in the manual.
Example type plate
Product serial number:
Material number:
Certification:

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EN 1. Safety instructions
1.12 Note on CE marking
The CE marking is based on the require-
ments of the applied Directives:
○2014/34/EU Directive for equipment and
protective systems intended for use in
potentially explosive atmospheres (ATEX)
Note on Pressure Equipment Directive
2014/68/EU
Due to its performance characteristics,
the product does not reach the limit values
defined in Article 4, Paragraph 1, Subpara-
graph (a) item (i) and is, pursuant toArticle
4, Paragraph 3, excluded from the scope of
Pressure Equipment Directive 2014/68/EU.
1.13 Persons authorized to use the
product
1.13.1 Operator
A person competent due to training, knowl-
edge, and experience to execute the func-
tions and activities associated with normal
operation; this also includes the avoidance
of possible hazards that may arise during
operation.
1.13.2 
A person with appropriate technical train-
ing, knowledge, and experience who can
recognize and avoid the hazards that may
occur during transport, assembly, first start-
up, operation, maintenance, repair, and
dismantling
1.13.3 Specialist in maintenance and
servicing in potentially explosive
atmospheres
This is a person competent due to qualified
technical education, training, and experience
to recognize risks and possible hazards when
working on the device or subcomponents
in potentially explosive atmospheres and to
rectify these by taking suitable actions.The
specialist has knowledge of the various types
of protection, installation procedures, and
explosive atmosphere classifications. The
specialist is familiar with the rules and re-
quirements relevant to his or her activity and
explosion protection, especially ATEX Direc-
tives 2014/34/EU and 1999/92/EC.

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EN1. Safety instructions
1.14 
Before commencing work, the operator
must inform outside fitters of the opera-
tional safety regulations, applicable accident
prevention regulations, and the functions of
the main machine and its protective devices.
1.15 Provision of personal protective
gear
The operator must provide personal protec-
tive gear appropriate for the location and
intended application. This also includes ESD
clothing and ESD tools for work in a poten-
tially explosive atmosphere.
1.16 Operation
The following must be observed during first
start-up and operation:
○An approved and tested switch-off de-
vice for the operation of explosion-proof
equipment in ATEX category I M2 is
available.
○All information within this manual and
all information within the referenced
documents
○All laws and regulations that the operator
must observe
1.17 Emergency shutdown
Shut down the product in an emergency by:
○Switching off the main machine in which
the product is integrated
○
If necessary, pressing the on/off switch on
the main machine

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EN 1. Safety instructions
1.18 Transport, assembly, maintenance, malfunction, repair, shutdown, disposal
○Assemble the product only outside
the operating range of moving parts,
at an adequate distance from sources
of heat or cold. Other units of the ma-
chine, the vehicle must not be damaged
or impaired in their function by the
installation.
○Dry any wet, slippery surfaces or cover
appropriately.
○Cover hot or cold surfaces appropriately.
○Ensure proper grounding of the product.
○Drill required holes only on non-critical,
non-load-bearing parts of the operator's
machine/infrastructure. Use existing
boreholes. Do not damage lines or cables
when drilling. Modifications to SKF prod-
ucts are prohibited. This also includes
all drilling, welding, firing, and grinding
work.
○Observe any possible wearing spots. Pro-
tect components appropriately.
○All components used must be designed
for:
- The maximum operating pressure
- The maximum/minimum ambient
temperature
- The lubricant to be delivered
- The required ATEX zone
- The operating and ambient conditions
at the place of use
○No parts may be subjected to torsion,
shear, or bending.
○All relevant persons must be informed of
the activity prior to the start of this work.
Precautionary operational measures,
work instructions must be observed.
○Transport only with suitable transport
and lifting gear on suitable paths.
○Maintenance and repair work can be sub-
ject to restrictions at low or high temper-
atures (e.g., altered flow properties of the
lubricant). Maintenance and repair work
should therefore preferably be performed
at room temperature.
○Prior to performing work, the product
and the machine in which the product will
be integrated must be depressurized and
secured against unauthorized activation.
○Take appropriate measures to ensure that
moving, detached parts are immobilized
during the work and that no limbs can be
pinched by unintended movements.

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EN1. Safety instructions
○Check parts for contamination before use
and clean if necessary.
○Lubrication piping should be filled with
lubricant prior to assembly. This simplifies
subsequent venting of the system.
○Adhere to the specified torques. Use
a calibrated torque wrench when
tightening.
○Use suitable hoisting equipment when
working with heavy parts.
○Avoid mixing up/incorrectly assembling
disassembled parts. Label parts.
1.19 First start-up, daily start-up
Ensure that:
○All safety mechanisms 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 im-
mediately replaced.
1.20 Cleaning
○There is a fire hazard from the use of
flammable cleaning agents. Use only
non-flammable cleaning agents that are
suitable for the intended purpose.
○Do not use corrosive cleaning agents.
○Do not use steam-jet equipment or high-
pressure cleaners.
○Mark wet areas accordingly.

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EN 1. Safety instructions
1.22 Special safety instructions regard-
ing explosion protection
○Always behave so as to avoid explosion
hazards.
○A written work authorization from the
operator is required prior to initiating
work in potentially explosive atmo-
spheres. Unauthorized persons must be
kept away.
○There must be no evidence that parts of
the explosion protection are missing or
non-functional. If this is not excluded,
switch off the machine and immediately
notify the supervisor.
○Explosion protection measures must
never be deactivated, changed, or
bypassed.
○The introduction of ignition sources such
as sparks, open flames, and hot surfaces
into potentially explosive atmospheres is
prohibited.
○Depending on the operating conditions,
check the product for damage that may
present a risk of ignition and check for
proper function. An inspection must be
conducted at least every 12 months.
○The ignition temperature of the sur-
rounding potentially explosive gases and
vapors must be greater than 125% of the
maximum surface temperature.
○The minimum ignition temperature and
the glow temperature and the surround-
ing potentially explosive dusts must be
greater than 150% of the maximum sur-
face temperature.
○The usage limits for explosion protection
are clearly defined in the explosion pro-
tection marking by the device categories,
gas and dust groups and temperature
1.21 Protective and safety mechanisms
○Protective and safety mechanisms can-
not be removed, modified, nor 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 then checked for proper function.
The following protective and safety mecha-
nisms are available depending on the equip-
ment design of the pump:
○Mechanical fill level gauge
○Pressure regulating valves
○Equipotential bonding connection

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Version 02
EN1. Safety instructions
classes. Light metal dusts, as a potentially
explosive ambient medium, are always
prohibited even when dust group IIIc is
specified.
○The operator must ensure high-reliability
fill level monitoring.
○The lubricant’s ignition temperature has
to be at least 50 kelvin above the max.
surface temperature of the components.
○Use only tools and clothing approved for
use in potentially explosive atmospheres
(ESD).
○Transport/assembly/repairs and work on
electrical components may be performed
only if it is ensured that there is no explo-
sive atmosphere present.
○Repairs or modifications to explosion-
proof machinery may be performed only
by the manufacturer or a workshop rec-
ognized by a notified body and accepted
by the manufacturer. If the work is not
performed by the manufacturer itself, the
repair must be accepted and approved in
writing by a recognized expert. The repair
is marked by a repair sign on the machine
containing the following information:
- Date
- Executing company
- Type of repair
- If applicable, mark by the expert
○Shipping damage may lead to the loss of
explosion protection. If there is apparent
shipping damage, do not install or put
into operation the product.
○All parts of the grounding concept must
be properly present and connected with
the main machine.
○If lifting eyes are removed after installation,
seal the threaded holes according to the
protection type.
○Handle materials in such a way that no
sparks may arise from tilting, dropping,
slipping, rubbing, or striking. If necessary,
cover materials by appropriate means.
○The operator must critically examine
whether operation without an empty signal
results in a new hazard potential (e.g., due
to heating of bearings on the machine
being lubricated to the range of the igni-
tion temperature in case of lubrication
failure). If this cannot be reliably excluded,
an empty signal must be provided or
appropriate organizational measures
taken to monitor the temperature of the
bearings.
○Avoid / immediately remove any accu-
mulated dust. Accumulated dust has a

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951-180-078-EN
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EN 1. Safety instructions
thermal insulating effect and promotes
the formation when agitated/swirled.
○The product must be integrated into the
operator’s lightning protection scheme.
○If there is mine gas present, the pump of
series PFHM must not (continued to) be
operated.
○The product is to be integrated into the
operator's switch-off scheme for explo-
sion-proof devices in ATEX category | M2.
○All parts must be inspected for corrosion
on a regular basis. Replace affected parts.
○Any additional electrical monitoring
equipment must be securely connected
and correctly configured.
○The maximum hydraulic oil temperature
specified in the technical data must not
be exceeded! The operator must ensure
compliance with maximum hydraulic oil
temperature specified for the respective
temperature class to a high degree of
reliability.
○The maximum hydraulic oil volumetric
flows and pressures specified in the
technical data must not be exceeded!
The operator must ensure compliance
with specified maximum hydraulic oil
volumetric flows and pressures to a high
degree of reliability.
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The ATEX approval is nullified by:
○Improper usage
○Unauthorized alterations
○Installation of non-original SKF spare/
replacement components
○Failure to comply with this manual and
referenced documents
○Use of non-specified equipment
○Failure to observe the prescribed repair
and maintenance intervals
○Operation with a damaged, missing, or
improperly performed subsequent finish
that does not meet the requirements of
the standards applicable to ATEX.