Hägglunds Compact CA - Filtration Recommendations

12
Installation and Maintenance Manual, Compact CA
Environmentally acceptable fluids
Explanation of
"GRADE OF FILTRATION"
Grade of filtration ß10=75 indicates the fol-
lowing:
ß10 means the size of particle ≥10 µm that will
be removed by filtration.
=75 means the grade of filtration of above men-
tioned size of particle. The grade of filtration is
defined as number of particles in the oil before
filtration in relation to number of particles in the
oil after filtration.
Ex. Grade of filtration is ß10=75.
Before the filtration the oil contains N number
of particles ≥10 µm and after passing the filter
once the oil contains
N
75
number of particles
≥10 µm.
This means that
=
74·
N
75
N
75
N
number of
particles have been filtered (=98.6%).
* Vegetable fluids give good lubrication and small change of viscosity with different temperature. Vegetable fluids must
be controlled every 3 months and temperature shall be less than +45 °C (113 °F) to give good service life for the
fluid.
** Environmental acceptable fluid gives the same service life for the drive, as mineral oil.
*** The fluid shall have less than 10g/100g according to ASTMD 1958-97/DIN 53241
Technical data
Filtration
The oil in a hydraulic system must always be
filtered and also the oil from your supplier has
to be filtered when adding it to the system.
The grade of filtration in a hydraulic system is
a question of service life v.s. money spent on
filtration.
In order to obtain stated service life it is impor-
tant to follow our recommendations concerning
contamination level.
When choosing the filter it is important to
consider the amount of dirt particles that the
filter can absorb and still operate satisfactory.
For that reason we recommend a filter with an
indicator that gives a signal when it is time to
change the filter cartridge.
Filtering recommendations
Before start-up, check that the system is thor-
oughly cleaned.
1. For industrial applications the contamina-
tion level should not exceed ISO 4406:1999
18/16/13 (NAS 1638, class 7).
2. When filling the tank and motor case, we
recommend the use of a filter with the grade
of filtration ß10=75.
Fluid Approved Seals Internal paint
Vegetable */** Fluid HTG Yes Nitrile (std motor) -
Synthetic **/*** Esters HE Yes Nitrile (std motor) -