4.6. Lubrication line connection
Prior to installation, it is recommended that you fill
the lubrication lines with lubricant or use pre-filled
lubrication lines to simplify subsequent venting of
the centralized lubrication system.
The lubrication lines must be connected to the
piston pump unit in such a way that no forces can
be transferred to the assembled piston pump unit
(stress-free connection).
Warning!
The fittings used to connect the lubrication
line should be designed for the maximum
operating pressure of the piston pump
unit. If they are not, the lubrication line
system needs to be protected from
excessive pressure by means of a
pressure-limiting valve.
For operating pressures up to 250 bar as can occur
especially in progressive centralized lubrication
systems, SKF cutting-sleeve screw unions
conforming to DIN 2353 can be used. If using
fittings from other manufacturers, pay careful
attention to the assembly instructions and
technical data from the manufacturer.
On piston pump units without mounted progressive
distributor, the lubrication lines are connected
directly to lubrication line connections 1 and 2 on
the pump housing.
On piston pump units with mounted progressive
feeder, the lubrication point lines are directly routed
from the lubrication line connections on the
progressive distributor to the lubrication points. The
lubrication line connections on the progressive
distributor are equipped with plug connectors to
which the lubrication point line can be connected.
4.7. Lubrication line arrangement
When arranging the main lubricant lines and
lubrication point lines, observe the following
instructions in order to ensure that the entire
lubrication system functions smoothly.
The main lubricant line must be dimensioned in
accordance with the maximum operating pressure
occurring in the piston pump unit used and the
delivery volume of that unit. If possible, the main
lubricant line should rise upward from the piston
pump unit and be ventable at the highest point on
the lubrication line system.
Lubricant distributors at the end of the main
lubricant line must be installed such that the outlets
of the lubricant distributors point upwards. If the
system configuration requires that the lubricant
distributors be arranged below the main lubricant
line, they should not be placed at the end of the
main lubricant line.
The pipes, hoses, shutoff valves and directional
control valves, fittings, etc. that will be used must be
designed for the maximum operating pressure of
the piston pump unit, the permissible temperatures
and the lubricants that will be delivered. The
lubrication line system also needs to be protected
from excessive pressure by means of a pressure-
limiting valve.
All components of the lubrication line system such
as pipes, hoses, shutoff valves and directional
control valves, fittings, etc. must be carefully cleaned
before assembly. No seals in the lubrication line
system should protrude inwards in a way that
disrupts the flow of the lubricant and could allow
contaminants to enter the lubrication line system.
Lubrication lines should always be arranged so that
air pockets cannot form anywhere. Avoid changes in
the cross-section of the lubrication line from small
to large cross-sections in the direction of flow of the
lubricant. When the cross-section does change, the
transition should be gentle.
The flow of lubricant in the lubrication lines should
not be impeded by the incorporation of sharp bends,
angle valves, or flap valves. Unavoidable changes in
the cross-section in lubrication lines must have
smooth transitions. Sudden changes of direction
should be avoided if possible.
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