Table of Contents
Advertisement
4
A4CSG Series 30 | Axial piston variable pump
Hydraulic fluids
Hydraulic fluids
The A4CSG variable pump is designed for operation
with HLP mineral oil according to DIN 51524.
See the following data sheets for application instructions and
requirements for hydraulic fluids before the start of project
planning:
▶ 90220: Hydraulic fluids based on mineral oils and related
hydrocarbons
Explanation regarding the selection of hydraulic fluid
Selection of hydraulic fluid shall make sure that the operating
viscosity in the operating temperature range is within the
optimum range (ν
; see selection diagram).
opt
Please note
The leakage temperature which is influenced by pressure and
rotational speed is always above the reservoir temperature.
Viscosity and temperature of hydraulic fluids
Viscosity
Cold start
ν
max
Warm-up phase
ν = 1000 to 100 mm
Continuous operation
ν = 100 to 16 mm
ν
opt
Short-term operation
ν
min
▼ Selection diagram
Maximum permissible viscosity on cold start
Optimum operating viscosity range v
Optimum efficiency
Minimum permissible viscosity for short-term operation
Minimum permissible temperature on cold start
Bosch Rexroth AG, RE 92105-01-X-B2/2019.08.06
Temperature
≤ 1000 mm
2
/s
θ
≥ -25 °C
St
2
θ ≥ -25 °C
/s
2
/s
T3
θ = -25 °C to +90 °C
T4
θ = -25 °C to +80 °C
= 36 to 16 mm
2
/s
≤ 10 mm
2
/s
T3
θ = -25 °C to +90 °C
T4
θ = -25 °C to +80 °C
opt
Temperature class T4 and T3 as to ATEX:
For safety instructions, see "Operating data monitoring – X
parameters" on page 5.
Ignition temperature of hydraulic fluid
The pump is approved for temperature classes T4 to T1
according to DIN EN ISO 80079-36 and -37.
Under DIN EN ISO 80079-37, only hydraulic fluids with
an ignition temperature at least 50 K above the maximum
surface temperature of the approved temperature class should
be used. Example: For the temperature class T4, the ignition
temperature of the hydraulic fluid should be ≥ 185 °C.
Comment
t ≤ 3 min, without load (p ≤ 50 bar)
Maximum permissible temperature difference between axial
piston unit
and hydraulic fluid in the system maximum 25 K
For p
, 0.5 × n
nom
Measured at the drain port
Observe the permissible temperature range of the shaft seal
optimal operating viscosity and efficiency range
t < 3 min, p < 0.3 × p
1000
600
400
200
100
60
40
36
20
16
10
-25
-10
0
10
Temperature θ [ °C]
und t ≤ 15 min
max
nom
80 90
30
50
70
Advertisement
Table of Contents
