Bosch Rexroth A6VM series 71 User Manual

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
Hydraulic fluids
5
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)
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
opt
see selection diagram).
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).
Viscosity and temperature of hydraulic fluids
Viscosity Temperature Comment
Cold start
ν
max
≤
7400 SUS
(1600 mm
2
/s)
θ
St
≥
−40°F (−40°C)
t≤3 min, n≤1000 rpm, without load p≤725psi (p≤50bar)
Permissible temperature difference
ΔT≤
45°F (25K) between axial piston unit and hydraulic fluid in the system
Warm-up phase
ν<
7400 to 1850SUS
(1600to 400mm
2
/s)
θ=
−40°F to −13 °F
(−40°C to −25°C)
at p≤0.7×p
nom
, n≤0.5×n
nom
and t≤15min
Continuous
operation
ν =
1850 to 47SUS
(400 to 10mm
2
/s)
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)
θ=
−13°Fto +217°F
(−25°Cto +103°C)
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)
ν
opt
=
167 to 81 SUS
(36 to 16mm
2
/s)
Range of optimum operating viscosity and efficiency
Short-term
operation
ν
min
≥
49 SUS
(7mm
2
/s)
t<3min, p<0.3×p
nom
▼ Selection diagram
60
200
300
100
500
1000
2000
3000
5000
7000
VG 22
VG 32
VG 46
VG 68
VG 100
80
150
(7)
(10)
(40)
(60)
(20)
(100)
(200)
(400)
(600)
(1000)
(1600)
(16)
(36)
−40 −13 120
0 20 40 60 80 160 195
240
(−40)
(−25) (−10)
(0)
(10) (30) (50) (70) (90) (115)
50
70
Range of optimum operating viscosity ν
opt
Optimum efficiency
Maximum permissible viscosity for cold start
Minimum permissible viscosity
for short-term operation
Temperature θ [°F (°C)]
Viscosity ν [SUS (mm
2
/s)]
Continuous operation
Warm-up phase
Minimum permissible temperature for cold start

Bosch Rexroth A6VM series 71 Specifications

General

Brand	Bosch
Model	Rexroth A6VM series 71
Category	Engine
Language	English