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