Bosch rexroth A4VSO 10 Series - Hydraulic Fluids

BoschRexrothAG, RE 92050-01-X-B2/2019-08-23
4 A4VSO Series 10, 11 and 30 | Axial piston variable pump
Hydraulic fluids
Hydraulic fluids
The A4VSO ATEX 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
Information on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
opt
; see selection diagram).
Please note
The leakage temperature which isinfluenced bypressure
and rotational speed isalways above the reservoir
temperature.
Temperature class T4 and T3 as to ATEX:
Safety instructions, see page 5
Ignition temperature of hydraulic fluid
The pump is approved for temperature class T4 to T1
according to DINENISO80079-36.
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.
Viscosity and temperature ofhydraulic fluids
Viscosity Temperature Comment
Cold start
ν
max
≤1000mm
2
/s θ
St
≥-20 °C 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
Warm-up phase
ν=1000 to 100mm
2
/s θ≥ -25°C For p
nom
, 0.5×n
max
und t≤15min
Continuous operation
ν=100 to 16mm
2
/s T3
θ=-20°C to +90°C
T4
θ=-20°C to +80°C
Measured at the drain port
Observe the permissible temperature range of the shaft seal
ν
opt
=36 to 16mm
2
/s
optimal operating viscosity and efficiency range
Short-term operation
ν
min
≤16 to 10mm
2
/s θ
max
=+90°C t<3 min, p<0.3×p
nom
▼ Selection diagram
-25 -10 10 30 50 8070 90
0
10
40
60
20
100
200
400
600
1000
16
36
VG 22
VG 32
VG 46
VG 68
VG 100
Optimum operating viscosity range v
opt
Optimum efficiency
Maximum permissible viscosity oncold start
Minimum permissible viscosity for short-term operation
Temperature θ [°C]
Viscosity v [mm
2
/s]
Minimum permissible temperature on cold start