Hydraulic fluid
The external gear unit is designed for operation with HLP
mineral oil complying with DIN 51524 1–3. For higher loads,
Bosch Rexroth recommends HLP complying with DIN 51524
Part 2 at minimum.1)
Explanation regarding the selection of hydraulic fluid
The hydraulic fluid should be selected so the operating
viscosity in the operating temperatue range is within the
optimal range (νopt; see selection diagram).
See the following data sheets for application instructions
and requirements for selecting hydraulic fluid, behavior
during operation as well as disposal and environmental
protection before you begin planning:
▶ 90220: Hydraulic fluids based on mineral oils and rela-
ted hydrocarbons
Viscosity and temperature of hydraulic fluids
Viscosity range
Permissible in continuous operationg
Recommended in continuous operation
Permissible for cold start
ν = 12 … 800 mm²/s
ν
ν
opt = 20 … 100 mm²/s
max ≤ 2000 mm²/s
Temperature range
With NBR seals (NBR = nitrile rubber)
With FKM seals (FKM = fluoroelastomer)
t = -30 °C … +80 °C
t = -10 °C … +110 °C
▼ Selection diagram
Max. viscosity on cold start
2000
1500
Warm-up
800
400
200
V
V
V
G 100
V
V
G 22
G 68
G 46
G 32
100
Continuous
operation
60
40
νopt
20
12
10
Min. viscosity for short-term operation
7
-40 -30 -20 -10
0
10
30
50
[°C]
80
110
Temperature t
Temperature range of NBR seals
Temperature range of FKM seals
machinery on the environment.If you want to know more details, please contact us immediately!
We mainly operating series as the following series：
1) Other hydraulic fluids on request.