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Hydraulic fluids
The variable motor A6VM is designed for operation with
mineral oil HLP according to DIN 51524.
Application instructions and requirements for hydraulic
fluids should be taken from the following data sheets
before the start of 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)
▶ 90223: Fire-resistan, water-containing hydraulic fluids
(HFAE, HFAS, HFB, HFC)
Viscosity and temperature of hydraulic fluids
Viscosity
Cold start
ν
≤ 7400 SUS
max
(1600 mm
Permissible temperature difference
Warm-up phase
7400 to 1850 SUS
ν <
(1600 to 400 mm
Continuous
ν =
1850 to 47 SUS
operation
(400 to 10 mm
= 167 to 81 SUS
ν
opt
(36 to 16 mm
Short-term
ν
≥ 49 SUS
min
operation
(7 mm
▼ Selection diagram
Maximum permissible viscosity for cold start
Range of optimum operating viscosity ν
Optimum efficiency
Minimum permissible viscosity
for short-term operation
Minimum permissible temperature for cold start
Temperature
θ
≥ −40 °F (−40 °C)
St
2
/s)
ΔT ≤ 45 °F (25 K)
−40 °F to −13 °F
θ =
2
/s)
(−40 °C to −25 °C)
2
/s)
θ = −13 °F to +217 °F
(−25 °C to +103 °C)
2
/s)
2
/s)
7000
5000
3000
2000
1000
500
300
200
150
100
opt
Axial piston variable motor | A6VM series 71
Details regarding the selection of hydraulic fluid
The hydraulic fluid should be selected such that the operat-
ing viscosity in the operating temperature range is within
the optimum range (ν
Note
At no point of the component may the temperature be higher
than 240 °F (115 °C). The temperature difference specified
in the table is to be taken into account when determining the
viscosity in the bearing.
If the above conditions cannot be maintained due to extreme
operating parameters, we recommend flushing the case at port
U or using a flushing and boost pressure valve (see page 63).
Comment
t ≤ 3 min, n ≤ 1000 rpm, without load p ≤ 725 psi (p ≤ 50 bar)
between axial piston unit and hydraulic fluid in the system
at p ≤ 0.7 × p
nom
This corresponds, for example on the VG 46, to a temperature range
of +41 °F to + 185 °F (+5 °C to +85 °C)(see selection diagram)
measured at port T
Note the permissible temperature range of the shaft seal
(ΔT = approx. 22 °F (12 K) between the bearing/shaft seal and port T)
Range of optimum operating viscosity and efficiency
t < 3 min, p < 0.3 × p
Warm-up phase
(1600)
(1000)
(600)
(400)
(200)
(100)
(60)
(40)
(36)
(20)
(16)
80
70
60
(10)
50
(7)
(−40) (−25) (−10) (0) (10)
−40
−13
0
20
Hydraulic fluids
see selection diagram).
opt
, n ≤ 0.5 × n
and t ≤ 15 min
nom
nom
(30)
(50)
40
60
80
120
Temperature θ [°F (°C)]
RE-A 91610/12.2015, Bosch Rexroth Corp.
5
(70)
(90)
(115)
160
195
240
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