Bosch rexroth A4VSO 10 Series User Manual

BoschRexrothAG, RE 92050-01-X-B2/2019-08-23
6 A4VSO Series 10, 11 and 30 | Axial piston variable pump
Hydraulic fluids
Filtration ofthe hydraulic fluid
Finer filtration improves thecleanliness level
ofthehydraulic fluid, which increases theservice life
oftheaxial piston unit.
A cleanliness level ofat least 20/18/15 is to be maintained
according to ISO 4406.
At ahydraulic fluid viscosity ofless than 10mm²/s
(e.g.duetohigh temperatures during short-term operation)
atthedrain port, acleanliness level ofatleast
19/17/14according toISO4406 isrequired.
For example, the viscosity is 10mm²/s at:
▶ HLP 32 atemperature of 73°C
▶ HLP 46 atemperature of 85°C
Bearing flushing
Bearing flushing is required for a safe, continuous operation
under the following operating conditions:
▶ When installed vertically (drive shaft up) for lubricating
the front bearing and shaft seal
▶ When operated at temperature and viscosity limits when
using mineral oil
▶ When installed above the reservoir
Bearing flushing is realized at port U in the area of the front
flange of the variable displacement pump. Theflushing fluid
flows through the front bearing and discharges with the
pump drain at the drain port.
For the individual sizes, the following minimum flushing
flows are necessary:
Size 40 71 125 180 250 355 500
Flushing flow q
sp
l/min 3 4 5 7 10 15 20
For the flushing flows indicated, there is a pressure
differential of approx. 2bar (Series10 and 11) or 3bar
(Series30) between port U (including fitting) and the
housing area.
Notice regarding series 3x
When using external bearing flushing, the throttle screw in
port U must be turned in to the end stop.
U
Throttle screw
Leakage pressure
The permissible leakage pressure (case pressure) depends
onthe rotational speed (see diagram).
4000
3000
2000
1000
0
4
3
2
1
180
125
71 40
500
250
355
Leakage pressure pL abs. [bar]
Size
Rotational speed n [rpm]
Maximum leakage pressure (case pressure)
p
L abs max
4bar absolute
The parameters are reference values; under certain
operating conditions, restrictions may berequired.
Flow direction
S toB

Bosch rexroth A4VSO 10 Series Specifications

General

Brand	Bosch
Model	rexroth A4VSO 10 Series
Category	Water Pump
Language	English