Hydraulic fluids  
The A10VSO variable pump is designed for operation  
with HLP mineral oil according to DIN 51524.  
Application instructions and requirements for hydraulic  
fluids should be taken from the following data sheets  
before the start project planning:  
▶ 90220: Hydraulic fluids based on mineral oils and  
related hydrocarbons  
▶ 90221: Environmentally acceptable hydraulic fluids  
▶ 90222: Fire-resistant, water-free hydraulic fluids  
(HFDR/HFDU) (for permissible technical data,  
see data sheet 90255)  
Notes on selection of hydraulic fluid  
The hydraulic fluid should be selected so that the operating  
viscosity in the operating temperature range is within the  
optimum range (νopt see selection diagram).  
Notice  
▶ The axial piston unit is suitable for operation with water-  
containing HF hydraulic fluid. See version “E”  
▶ 90223: Fire-resistant, water-containing hydraulic fluids  
(HFAE, HFAS, HFB, HFC)  
▶ 90225: Restricted technical data only for operation  
▶ with fire-resistant, water-free and water-containing  
hydraulic fluids (HFDR, HFDU, HFB, HFC)- technical data  
Viscosity and temperature of hydraulic fluids  
Viscosity  
max ≤ 1600 mm²/s  
Shaft seal  
NBR2)  
Temperature3) Comment  
t ≤ 3 min, without load (p ≤ 50 bar), n ≤ 1000 min-1  
Permissible temperature difference between axial piston unit  
and hydraulic fluid in the system maximum 25 K  
Cold start  
ν
θ
St ≥ −40 °C  
St ≥ -25 °C  
FKM  
θ
Warm-up phase  
ν = 1600 … 400 mm²/s  
ν = 400 … 10 mm²/s1)  
t ≤ 15 min, p ≤ 0.7 × pnom and n ≤ 0.5 × nnom  
measured at port L, L1  
Continuous  
operation  
NBR2)  
FKM  
θ = +85 °C  
θ = +110 °C  
Range of optimum operating viscosity and efficiency  
ν
opt = 36 … 16 mm²/s  
min = 10 … 7 mm²/s  
Short-term  
operation  
NBR2)  
FKM  
ν
θ = +85 °C  
t ≤ 3 min, p ≤ 0.3 × pnom , measured at port L, L1  
θ = +110 °C  
Over the years, we have been committed to the production and research of Rexroth A10VSO Series 31 Axial piston variable pump  
.We not only provide high quality machinery and accessories for sale on the market, we also care about customers' profits and the  
impact of machinery on the environment.If you want to know more details, please contact us immediately!  
We mainly operating series as the following series：Rexroth A A10VSO 18 Pump  
Rexroth A A10VSO 28 Pump  
Rexroth A A10VSO 45 Pump  
Rexroth A A10VSO 71 Pump  
Rexroth A A10VSO 100 Pump  
1) Corresponds e.g. for VG 46 to a temperature range of +4 °C to  
+85 °C (see selection diagram)  
3) If the temperature at extreme operating parameters cannot  
be adhered to, please contact us.  
2) Version EA10VSO...-P (if operating with HFA, HFB and HFC  
hydraulic fluids