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SYDFED-2X, SYDFED-3X, SYHDFED-1X | Product description
Filtration of the hydraulic
fluid
Bosch Rexroth AG, Edition 11.2021, RE 30017-B
mm 2 /s
2500
-40°
-20°
0°
1600
1000
600
400
200
100
60
40
20
10
5
-40°
-25°
-10°
0°
t min = -20 °C
Hydraulic fluid temperature range
Fig. 11: Selection diagram for the hydraulic fluid
Notes on the selection:
In order to be able to select the correct hydraulic fluid, the operating
temperature in the tank (open circuit) in relation to the ambient temperature
must be known.
The hydraulic fluid should be selected so that within the operating temperature
range, the operating viscosity is within the optimal range (ν
shown as gray area in the selection diagram.
We recommend that you select the next higher viscosity class.
Example:
At an ambient temperature of X °C, the resulting temperature in the tank is 60 °C.
Within the optimum operating viscosity range (ν
viscosity classes VG 46 and VG 68. You should select: VG 68.
The case drain oil temperature, which is subject to the influence of pressure
and pump revving speed, is always higher than the tank temperature. However,
the temperature must not exceed 90 °C at any point in the system.
If the conditions described above cannot be complied with due to extreme
operating parameters or high ambient temperatures, please consult us.
The finer the filtration of the hydraulic fluid, the better is the achieved cleanliness
class, which, in turn, prolongs the service life of the SY(H)DFED control system.
To ensure functional reliability of the SY(H)DFED control system, the hydraulic
fluid must comply at least with cleanliness class 18/16/13 according to ISO 4406
(for particle sizes 4/6/14 μm).
20°
40°
60°
80°
10°
30°
50°
70°
Temperature range
t max = +70 °C
opt
100°
1600
36
opt.
16
5
90°
t in °C
). This range is
opt
; gray area) this corresponds to
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