The Oil Transfer System combines high efficiency and low back pressure (30% less) scrubber
elements, and depending on viscosity and ambient oil temperature a 2.5 to 3 gallon per minute
flow rate. The elements combined with the low flow rate have numerous advantages. The
startup pressure on the elements is much less, which allows the filters to completely fill up with
dirt before the element needs replacement. On medium and high flow systems the differential
pressure, which dictates when to change the filter out, will come much sooner and the elements
will have a lot less dirt in them. Since the Oil Transfer Systems high/low elements will fill up
more completely and will be replaced at a lower pressure, the particles in the filter will be less
likely to break apart or be pushed through the elements, resulting in a high cleanliness level.
Additives are molecularly bonded and will not be removed by this filtration. With other systems
circulating hydraulic fluid in your equipments reservoir, for recycling purposes, with a medium
or high flow system is often done for hours; portions of the oil end up filtered once (on the far
end of the reservoir) and other portions (closest to the suction line) end up filtered ten times
with the higher pressure systems. This Oil Transfer Systems method takes less time and
achieves a higher overall cleanliness goal.
How clean should oil be? Caterpillar Inc. specifies new oil to have a particle count of ISO
16/13. If new oil is above this level of contamination it will not warranty the equipment. When
new oil from a leading international oil manufacturer was tested before putting it into new
Caterpillar equipment, the solid particle contamination was found to be 17/14. This was new oil
from a never previously opened container. In this case the new oil had to be further filtered to
bring it below the required specification. [Lubrication & Fluid Power magazine, Jan/Feb 2004,
from: http://www.l-fp/articles/0104/oil_cleanliness.html; excerpt from "Rotating Machinery
Essentials" by Mike Sondalini (1999)]
The filter bank scrubs all new oil, crankcase and hydraulic, including different weights of both,
without cross contamination, having a filter and hose for each different oil. A short flush hose
can be used in rare conditions to remove the approximate 1 oz. from the pump, but this is
normally not necessary. Most new oils have contamination levels of ISO code 21/18 (this
particle count, looks like course sandpaper under 100x magnification), with a single pass
through the system, using two elements in series, you can achieve cleanliness levels in the 14/13
ISO particle count range. Continually using the far cleaner oil will translate into better
equipment performance, fewer breakdowns and much longer life. Each time you reduce the
particle count # by 1 you increase bearing life seven times per #. Shop repair and replacement
cost will quickly pay for this system. Corporate Cat (for warranty) requires a 16/13 particle
count before any equipment leaves the factory and recommends a 18/15 or cleaner particle
count on the used hydraulic oil in the field.
Allocation of Particle Count Scale numbers
Hydraulic oil recycling can be achieved simply by passing operating temperature oil (for best
results) from the equipment through clean wire cloth pan and passing through a pair of the
high/low scrubber elements (high efficiency/low back pressure) on the filter bank to a wiped
out clean plastic drum, a third element for water removal can be added if needed. With a stand
pipe in the drum, run the fluid back through the same two or three elements in series and back
into the equipment. Two passes through the two element filter bank will achieve very clean and
good condition oil without removing any additives (have tested to verify). The five and ten foot
hoses used with this process are supplied with the system.
Additional pin filter assemblies can be added for as many different types and weights of oil you
have, without cross contamination. One assembly can be exchanged with another in seconds.
Equipment filters have a bypass, which means nominal 50% of the micron size will be removed.
Commonly the filter sizes are 25 micron for crankcases and 10 micron for hydraulics, large
particle removal only.
US Patents #6,022,473 and #6,630,091
elements, and depending on viscosity and ambient oil temperature a 2.5 to 3 gallon per minute
flow rate. The elements combined with the low flow rate have numerous advantages. The
startup pressure on the elements is much less, which allows the filters to completely fill up with
dirt before the element needs replacement. On medium and high flow systems the differential
pressure, which dictates when to change the filter out, will come much sooner and the elements
will have a lot less dirt in them. Since the Oil Transfer Systems high/low elements will fill up
more completely and will be replaced at a lower pressure, the particles in the filter will be less
likely to break apart or be pushed through the elements, resulting in a high cleanliness level.
Additives are molecularly bonded and will not be removed by this filtration. With other systems
circulating hydraulic fluid in your equipments reservoir, for recycling purposes, with a medium
or high flow system is often done for hours; portions of the oil end up filtered once (on the far
end of the reservoir) and other portions (closest to the suction line) end up filtered ten times
with the higher pressure systems. This Oil Transfer Systems method takes less time and
achieves a higher overall cleanliness goal.
How clean should oil be? Caterpillar Inc. specifies new oil to have a particle count of ISO
16/13. If new oil is above this level of contamination it will not warranty the equipment. When
new oil from a leading international oil manufacturer was tested before putting it into new
Caterpillar equipment, the solid particle contamination was found to be 17/14. This was new oil
from a never previously opened container. In this case the new oil had to be further filtered to
bring it below the required specification. [Lubrication & Fluid Power magazine, Jan/Feb 2004,
from: http://www.l-fp/articles/0104/oil_cleanliness.html; excerpt from "Rotating Machinery
Essentials" by Mike Sondalini (1999)]
The filter bank scrubs all new oil, crankcase and hydraulic, including different weights of both,
without cross contamination, having a filter and hose for each different oil. A short flush hose
can be used in rare conditions to remove the approximate 1 oz. from the pump, but this is
normally not necessary. Most new oils have contamination levels of ISO code 21/18 (this
particle count, looks like course sandpaper under 100x magnification), with a single pass
through the system, using two elements in series, you can achieve cleanliness levels in the 14/13
ISO particle count range. Continually using the far cleaner oil will translate into better
equipment performance, fewer breakdowns and much longer life. Each time you reduce the
particle count # by 1 you increase bearing life seven times per #. Shop repair and replacement
cost will quickly pay for this system. Corporate Cat (for warranty) requires a 16/13 particle
count before any equipment leaves the factory and recommends a 18/15 or cleaner particle
count on the used hydraulic oil in the field.
Allocation of Particle Count Scale numbers
Hydraulic oil recycling can be achieved simply by passing operating temperature oil (for best
results) from the equipment through clean wire cloth pan and passing through a pair of the
high/low scrubber elements (high efficiency/low back pressure) on the filter bank to a wiped
out clean plastic drum, a third element for water removal can be added if needed. With a stand
pipe in the drum, run the fluid back through the same two or three elements in series and back
into the equipment. Two passes through the two element filter bank will achieve very clean and
good condition oil without removing any additives (have tested to verify). The five and ten foot
hoses used with this process are supplied with the system.
Additional pin filter assemblies can be added for as many different types and weights of oil you
have, without cross contamination. One assembly can be exchanged with another in seconds.
Equipment filters have a bypass, which means nominal 50% of the micron size will be removed.
Commonly the filter sizes are 25 micron for crankcases and 10 micron for hydraulics, large
particle removal only.
US Patents #6,022,473 and #6,630,091
About Our System
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When count is done by
optical microscope two
size ranges are used: 5
micron and larger and 15
micron and larger. If the
two-scale number is
used, the contamination
result could be 18/16. In
this case there are
between 1300 and 2500
particles larger than 5
micron/ml of sample and
between 320 to 640
particles larger than 15
micron.
optical microscope two
size ranges are used: 5
micron and larger and 15
micron and larger. If the
two-scale number is
used, the contamination
result could be 18/16. In
this case there are
between 1300 and 2500
particles larger than 5
micron/ml of sample and
between 320 to 640
particles larger than 15
micron.
