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Warning
It is compulsory to use oils whose inflammable degree is at least 50K above the maximum surface
temperature of the motors. See also .
Ambient temperature
Maximum ambient temperature depends on the requested ATEX class needed.
In general the ambient temperature should lie between -40° C [-40° F] and +70° C [158 °F] to ensure that
the shaft seal retains its sealing capacity.
Oil temperature
Maximum oil temperature depends on the requested ATEX class needed (in this case T3)..
Under normal operating conditions it is recommended to keep the temperature in the range of 60 °C
[140 °F] to 85 °C [185 °F].
Viscosity
Maintain fluid viscosity within the recommended range for maximum efficiency and bearing life.
Minimum viscosity should only occur during brief occasions of maximum ambient temperature and
severe duty cycle operation. Maximum viscosity should only occur at cold start. Limit speeds until the
system warms up.
Fluid viscosity limits
Conditions
mm
2
/s (cSt)
SUS
Minimum
5
42
Continuous
7
49
Maximum
1600
7416
We recommend the use of an oil type having a viscosity of 12 - 80mm
2
/s [66 - 371 SUS] at the actual
operating temperature.
Filtering
It is necessary to keep the level of oil contamination at an acceptable level to ensure problem-free
operation. The recommended maximum level of contamination in systems in the hydraulic motors is
22/20/16 (ISO 4406-1999).
User Manual
ATEX H1 Bent Axis Variable Displacement Motors
Technical information
©
Danfoss | August 2021
BC382476021584en-000102 | 9
